for #738, implements boxes codec

@@ -69,6 +69,7 @@ public:
     /**
     /**
      * get the number of bytes to code to.
      * get the number of bytes to code to.
      */
      */
+    // TODO: FIXME: change to uint64_t.
     virtual int nb_bytes() = 0;
     virtual int nb_bytes() = 0;
     /**
     /**
      * encode object to bytes in SrsBuffer.
      * encode object to bytes in SrsBuffer.

@@ -242,6 +242,11 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_REQUEST_DATA                  3066
 #define ERROR_REQUEST_DATA                  3066
 #define ERROR_EDGE_PORT_INVALID             3067
 #define ERROR_EDGE_PORT_INVALID             3067
 #define ERROR_EXPECT_FILE_IO                3068
 #define ERROR_EXPECT_FILE_IO                3068
+#define ERROR_MP4_BOX_OVERFLOW              3069
+#define ERROR_MP4_BOX_REQUIRE_SPACE         3070
+#define ERROR_MP4_BOX_ILLEGAL_TYPE          3071
+#define ERROR_MP4_BOX_ILLEGAL_SCHEMA        3072
+#define ERROR_MP4_BOX_STRING                3073
 
 
 ///////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////
 // HTTP/StreamCaster/KAFKA protocol error.
 // HTTP/StreamCaster/KAFKA protocol error.

@@ -721,6 +721,7 @@ int SrsFlvDecoder::read_header(char header[9])
 
 
     srs_assert(header);
     srs_assert(header);
     
     
+    // TODO: FIXME: Should use readfully.
     if ((ret = reader->read(header, 9, NULL)) != ERROR_SUCCESS) {
     if ((ret = reader->read(header, 9, NULL)) != ERROR_SUCCESS) {
         return ret;
         return ret;
     }
     }
@@ -746,6 +747,7 @@ int SrsFlvDecoder::read_tag_header(char* ptype, int32_t* pdata_size, uint32_t* p
     char th[11]; // tag header
     char th[11]; // tag header
     
     
     // read tag header
     // read tag header
+    // TODO: FIXME: Should use readfully.
     if ((ret = reader->read(th, 11, NULL)) != ERROR_SUCCESS) {
     if ((ret = reader->read(th, 11, NULL)) != ERROR_SUCCESS) {
         if (ret != ERROR_SYSTEM_FILE_EOF) {
         if (ret != ERROR_SYSTEM_FILE_EOF) {
             srs_error("read flv tag header failed. ret=%d", ret);
             srs_error("read flv tag header failed. ret=%d", ret);
@@ -783,6 +785,7 @@ int SrsFlvDecoder::read_tag_data(char* data, int32_t size)
 
 
     srs_assert(data);
     srs_assert(data);
     
     
+    // TODO: FIXME: Should use readfully.
     if ((ret = reader->read(data, size, NULL)) != ERROR_SUCCESS) {
     if ((ret = reader->read(data, size, NULL)) != ERROR_SUCCESS) {
         if (ret != ERROR_SYSTEM_FILE_EOF) {
         if (ret != ERROR_SYSTEM_FILE_EOF) {
             srs_error("read flv tag header failed. ret=%d", ret);
             srs_error("read flv tag header failed. ret=%d", ret);
@@ -801,6 +804,7 @@ int SrsFlvDecoder::read_previous_tag_size(char previous_tag_size[4])
     srs_assert(previous_tag_size);
     srs_assert(previous_tag_size);
     
     
     // ignore 4bytes tag size.
     // ignore 4bytes tag size.
+    // TODO: FIXME: Should use readfully.
     if ((ret = reader->read(previous_tag_size, 4, NULL)) != ERROR_SUCCESS) {
     if ((ret = reader->read(previous_tag_size, 4, NULL)) != ERROR_SUCCESS) {
         if (ret != ERROR_SYSTEM_FILE_EOF) {
         if (ret != ERROR_SYSTEM_FILE_EOF) {
             srs_error("read flv previous tag size failed. ret=%d", ret);
             srs_error("read flv previous tag size failed. ret=%d", ret);

@@ -44,6 +44,10 @@ public:
     ISrsReader();
     ISrsReader();
     virtual ~ISrsReader();
     virtual ~ISrsReader();
 public:
 public:
+    /**
+     * Read bytes from reader.
+     * @param nread How many bytes read from channel. NULL to ignore.
+     */
     virtual int read(void* buf, size_t size, ssize_t* nread) = 0;
     virtual int read(void* buf, size_t size, ssize_t* nread) = 0;
 };
 };
 
 

@@ -23,19 +23,380 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 
 #include <srs_kernel_mp4.hpp>
 #include <srs_kernel_mp4.hpp>
 
 
-#include <string.h>
-
 #include <srs_kernel_log.hpp>
 #include <srs_kernel_log.hpp>
 #include <srs_kernel_error.hpp>
 #include <srs_kernel_error.hpp>
+#include <srs_kernel_stream.hpp>
+#include <srs_core_autofree.hpp>
+#include <srs_kernel_io.hpp>
+#include <srs_kernel_buffer.hpp>
+
+#include <string.h>
+using namespace std;
+
+#define SRS_MP4_BOX_UUID 0x75756964 // 'uuid'
+#define SRS_MP4_BOX_FTYP 0x66747970 // 'ftyp'
+#define SRS_MP4_BOX_MDAT 0x6d646174 // 'mdat'
+#define SRS_MP4_BOX_FREE 0x66726565 // 'free'
+#define SRS_MP4_BOX_SKIP 0x736b6970 // 'skip'
+#define SRS_MP4_BOX_MOOV 0x6d6f6f76 // 'moov'
+#define SRS_MP4_BOX_MVHD 0x6d766864 // 'mvhd'
+#define SRS_MP4_BOX_TRAK 0x7472616b // 'trak'
+#define SRS_MP4_BOX_TKHD 0x746b6864 // 'tkhd'
+#define SRS_MP4_BOX_EDTS 0x65647473 // 'edts'
+#define SRS_MP4_BOX_ELST 0x656c7374 // 'elst'
+#define SRS_MP4_BOX_MDIA 0x6d646961 // 'mdia'
+#define SRS_MP4_BOX_MDHD 0x6d646864 // 'mdhd'
+#define SRS_MP4_BOX_HDLR 0x68646c72 // 'hdlr'
+#define SRS_MP4_BOX_MINF 0x6d696e66 // 'minf'
+#define SRS_MP4_BOX_VMHD 0x766d6864 // 'vmhd'
+#define SRS_MP4_BOX_SMHD 0x736d6864 // 'smhd'
+#define SRS_MP4_BOX_DINF 0x64696e66 // 'dinf'
+#define SRS_MP4_BOX_URL  0x75726c20 // 'url '
+#define SRS_MP4_BOX_URN  0x75726e20 // 'urn '
+#define SRS_MP4_BOX_DREF 0x64726566 // 'dref'
+#define SRS_MP4_BOX_STBL 0x7374626c // 'stbl'
+#define SRS_MP4_BOX_STSD 0x73747364 // 'stsd'
+#define SRS_MP4_BOX_STTS 0x73747473 // 'stts'
+#define SRS_MP4_BOX_CTTS 0x63747473 // 'ctts'
+#define SRS_MP4_BOX_STSS 0x73747373 // 'stss'
+#define SRS_MP4_BOX_STSC 0x73747363 // 'stsc'
+#define SRS_MP4_BOX_STCO 0x7374636f // 'stco'
+#define SRS_MP4_BOX_STSZ 0x7374737a // 'stsz'
+
+#define SRS_MP4_EOF_SIZE 0
+#define SRS_MP4_USE_LARGE_SIZE 1
+
+int srs_mp4_string_length(const string& v)
+{
+    return (int)v.length()+1;
+}
+
+void srs_mp4_string_write(SrsBuffer* buf, const string& v)
+{
+    if (!v.empty()) {
+        buf->write_bytes((char*)v.data(), (int)v.length());
+    }
+    buf->write_1bytes(0x00);
+}
+
+int srs_mp4_string_read(SrsBuffer* buf, string& v, int left)
+{
+    int ret = ERROR_SUCCESS;
+    
+    char* p = buf->data() + buf->pos();
+    
+    char* start = p;
+    while (p < start + left) {
+        if (*p == 0x00) {
+            v.append(start, p - start);
+            buf->skip((int)(p - start));
+            return ret;
+        }
+    }
+    
+    ret = ERROR_MP4_BOX_STRING;
+    srs_error("MP4 string corrupt, left=%d. ret=%d", left, ret);
+    return ret;
+}
 
 
 SrsMp4Box::SrsMp4Box()
 SrsMp4Box::SrsMp4Box()
 {
 {
-    size = 0;
+    smallsize = 0;
+    largesize = 0;
+    usertype = NULL;
+    start_pos = 0;
     type = 0;
     type = 0;
 }
 }
 
 
 SrsMp4Box::~SrsMp4Box()
 SrsMp4Box::~SrsMp4Box()
 {
 {
+    vector<SrsMp4Box*>::iterator it;
+    for (it = boxes.begin(); it != boxes.end(); ++it) {
+        SrsMp4Box* box = *it;
+        srs_freep(box);
+    }
+    boxes.clear();
+    
+    srs_freepa(usertype);
+}
+
+uint64_t SrsMp4Box::sz()
+{
+    return smallsize == SRS_MP4_USE_LARGE_SIZE? largesize:smallsize;
+}
+
+int SrsMp4Box::left_space(SrsBuffer* buf)
+{
+    return (int)sz() - (buf->pos() - start_pos);
+}
+
+int SrsMp4Box::discovery(SrsBuffer* buf, SrsMp4Box** ppbox)
+{
+    *ppbox = NULL;
+    
+    int ret = ERROR_SUCCESS;
+    
+    if (!buf->require(8)) {
+        ret = ERROR_MP4_BOX_REQUIRE_SPACE;
+        srs_error("MP4 discovery require 8 bytes space. ret=%d", ret);
+        return ret;
+    }
+    
+    // Discovery the size and type.
+    uint64_t largesize = 0;
+    uint32_t smallsize = (uint32_t)buf->read_4bytes();
+    uint32_t type = (uint32_t)buf->read_4bytes();
+    if (smallsize == SRS_MP4_USE_LARGE_SIZE) {
+        if (!buf->require(8)) {
+            ret = ERROR_MP4_BOX_REQUIRE_SPACE;
+            srs_error("MP4 discovery require 16 bytes space. ret=%d", ret);
+            return ret;
+        }
+        largesize = (uint64_t)buf->read_8bytes();
+        buf->skip(-8);
+    }
+    buf->skip(-8);
+    
+    // Only support 31bits size.
+    if (largesize > 0x7fffffff) {
+        ret = ERROR_MP4_BOX_OVERFLOW;
+        srs_error("MP4 discovery overflow 31bits, size=%"PRId64". ret=%d", largesize, ret);
+        return ret;
+    }
+    
+    SrsMp4Box* box = NULL;
+    switch(type) {
+        case SRS_MP4_BOX_FTYP: box = new SrsMp4FileTypeBox(); break;
+        case SRS_MP4_BOX_MDAT: box = new SrsMp4MediaDataBox(); break;
+        case SRS_MP4_BOX_FREE: case SRS_MP4_BOX_SKIP: box = new SrsMp4FreeSpaceBox(); break;
+        case SRS_MP4_BOX_MOOV: box = new SrsMp4MovieBox(); break;
+        case SRS_MP4_BOX_MVHD: box = new SrsMp4MovieHeaderBox(); break;
+        case SRS_MP4_BOX_TRAK: box = new SrsMp4TrackBox(); break;
+        case SRS_MP4_BOX_TKHD: box = new SrsMp4TrackHeaderBox(); break;
+        case SRS_MP4_BOX_EDTS: box = new SrsMp4EditBox(); break;
+        case SRS_MP4_BOX_ELST: box = new SrsMp4EditListBox(); break;
+        case SRS_MP4_BOX_MDIA: box = new SrsMp4MediaBox(); break;
+        case SRS_MP4_BOX_MDHD: box = new SrsMp4MediaHeaderBox(); break;
+        case SRS_MP4_BOX_HDLR: box = new SrsMp4HandlerReferenceBox(); break;
+        case SRS_MP4_BOX_MINF: box = new SrsMp4MediaInformationBox(); break;
+        case SRS_MP4_BOX_VMHD: box = new SrsMp4VideoMeidaHeaderBox(); break;
+        case SRS_MP4_BOX_SMHD: box = new SrsMp4SoundMeidaHeaderBox(); break;
+        case SRS_MP4_BOX_DINF: box = new SrsMp4DataInformationBox(); break;
+        case SRS_MP4_BOX_URL: box = new SrsMp4DataEntryUrlBox(); break;
+        case SRS_MP4_BOX_URN: box = new SrsMp4DataEntryUrnBox(); break;
+        case SRS_MP4_BOX_DREF: box = new SrsMp4DataReferenceBox(); break;
+        case SRS_MP4_BOX_STBL: box = new SrsMp4SampleTableBox(); break;
+        case SRS_MP4_BOX_STSD: box = new SrsMp4SampleDescriptionBox(); break;
+        case SRS_MP4_BOX_STTS: box = new SrsMp4DecodingTime2SampleBox(); break;
+        case SRS_MP4_BOX_CTTS: box = new SrsMp4CompositionTime2SampleBox(); break;
+        case SRS_MP4_BOX_STSS: box = new SrsMp4SyncSampleBox(); break;
+        case SRS_MP4_BOX_STSC: box = new SrsMp4Sample2ChunkBox(); break;
+        case SRS_MP4_BOX_STCO: box = new SrsMp4ChunkOffsetBox(); break;
+        case SRS_MP4_BOX_STSZ: box = new SrsMp4SampleSizeBox(); break;
+        default:
+            ret = ERROR_MP4_BOX_ILLEGAL_TYPE;
+            srs_error("MP4 illegal box type=%d. ret=%d", type, ret);
+            break;
+    }
+    
+    if (box) {
+        box->smallsize = smallsize;
+        box->largesize = largesize;
+        box->type = type;
+        *ppbox = box;
+    }
+    
+    return ret;
+}
+
+int SrsMp4Box::nb_bytes()
+{
+    int sz = nb_header();
+    
+    vector<SrsMp4Box*>::iterator it;
+    for (it = boxes.begin(); it != boxes.end(); ++it) {
+        SrsMp4Box* box = *it;
+        sz += box->nb_bytes();
+    }
+    
+    return sz;
+}
+
+int SrsMp4Box::encode(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = encode_header(buf)) != ERROR_SUCCESS) {
+        srs_error("MP4 encode box header failed. ret=%d", ret);
+        return ret;
+    }
+    
+    if ((ret = encode_boxes(buf)) != ERROR_SUCCESS) {
+        srs_error("MP4 encode contained boxes failed. ret=%d", ret);
+        return ret;
+    }
+    
+    return ret;
+}
+
+int SrsMp4Box::decode(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    start_pos = buf->pos();
+    
+    if ((ret = decode_header(buf)) != ERROR_SUCCESS) {
+        srs_error("MP4 decode box header failed. ret=%d", ret);
+        return ret;
+    }
+    
+    if ((ret = decode_boxes(buf)) != ERROR_SUCCESS) {
+        srs_error("MP4 decode contained boxes failed. ret=%d", ret);
+        return ret;
+    }
+    
+    return ret;
+}
+
+int SrsMp4Box::encode_boxes(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    vector<SrsMp4Box*>::iterator it;
+    for (it = boxes.begin(); it != boxes.end(); ++it) {
+        SrsMp4Box* box = *it;
+        if ((ret = box->encode(buf)) != ERROR_SUCCESS) {
+            srs_error("MP4 encode contained box failed. ret=%d", ret);
+            return ret;
+        }
+    }
+    
+    return ret;
+}
+
+int SrsMp4Box::decode_boxes(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    int left = left_space(buf);
+    while (left > 0) {
+        SrsMp4Box* box = NULL;
+        if ((ret = discovery(buf, &box)) != ERROR_SUCCESS) {
+            srs_error("MP4 discovery contained box failed. ret=%d", ret);
+            return ret;
+        }
+        
+        srs_assert(box);
+        if ((ret = box->decode(buf)) != ERROR_SUCCESS) {
+            srs_freep(box);
+            srs_error("MP4 decode contained box failed. ret=%d", ret);
+            return ret;
+        }
+        
+        boxes.push_back(box);
+        left -= box->sz();
+    }
+    
+    return ret;
+}
+
+int SrsMp4Box::nb_header()
+{
+    int size = 8;
+    if (smallsize == SRS_MP4_USE_LARGE_SIZE) {
+        size += 8;
+    }
+    
+    if (type == SRS_MP4_BOX_UUID) {
+        size += 16;
+    }
+    
+    return size;
+}
+
+int SrsMp4Box::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    // Only support 31bits size.
+    if (sz() > 0x7fffffff) {
+        ret = ERROR_MP4_BOX_OVERFLOW;
+        srs_error("MP4 box size overflow 31bits, size=%"PRId64". ret=%d", sz(), ret);
+        return ret;
+    }
+    
+    int size = nb_header();
+    if (!buf->require(size)) {
+        ret = ERROR_MP4_BOX_REQUIRE_SPACE;
+        srs_error("MP4 box require %d bytes space. ret=%d", size, ret);
+        return ret;
+    }
+    
+    buf->write_4bytes(smallsize);
+    if (smallsize == SRS_MP4_USE_LARGE_SIZE) {
+        buf->write_8bytes(largesize);
+    }
+    buf->write_4bytes(type);
+    
+    if (type == SRS_MP4_BOX_UUID) {
+        buf->write_bytes((char*)usertype, 16);
+    }
+    
+    return ret;
+}
+
+int SrsMp4Box::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if (!buf->require(8)) {
+        ret = ERROR_MP4_BOX_REQUIRE_SPACE;
+        srs_error("MP4 box require 8 bytes space. ret=%d", ret);
+        return ret;
+    }
+    smallsize = (uint32_t)buf->read_4bytes();
+    type = (uint32_t)buf->read_4bytes();
+    
+    if (smallsize == SRS_MP4_EOF_SIZE) {
+        srs_warn("MP4 box EOF.");
+        return ret;
+    }
+    
+    if (smallsize == SRS_MP4_USE_LARGE_SIZE) {
+        if (!buf->require(8)) {
+            ret = ERROR_MP4_BOX_REQUIRE_SPACE;
+            srs_error("MP4 box require 8 bytes space. ret=%d", ret);
+            return ret;
+        }
+        largesize = (uint64_t)buf->read_8bytes();
+    }
+    
+    // Only support 31bits size.
+    if (sz() > 0x7fffffff) {
+        ret = ERROR_MP4_BOX_OVERFLOW;
+        srs_error("MP4 box size overflow 31bits, size=%"PRId64". ret=%d", sz(), ret);
+        return ret;
+    }
+    
+    if (type == SRS_MP4_BOX_UUID) {
+        if (!buf->require(16)) {
+            ret = ERROR_MP4_BOX_REQUIRE_SPACE;
+            srs_error("MP4 box requires 16 bytes space. ret=%d", ret);
+            return ret;
+        }
+        usertype = new uint8_t[16];
+        buf->read_bytes((char*)usertype, 16);
+    }
+    
+    // The left required size, determined by the default version(0).
+    int lrsz = nb_header() - SrsMp4Box::nb_header();
+    if (!buf->require(lrsz)) {
+        ret = ERROR_MP4_BOX_REQUIRE_SPACE;
+        srs_error("MP4 box requires %d bytes space. ret=%d", lrsz, ret);
+        return ret;
+    }
+    
+    return ret;
 }
 }
 
 
 SrsMp4FullBox::SrsMp4FullBox()
 SrsMp4FullBox::SrsMp4FullBox()
@@ -48,9 +409,58 @@ SrsMp4FullBox::~SrsMp4FullBox()
 {
 {
 }
 }
 
 
+int SrsMp4FullBox::nb_header()
+{
+    return SrsMp4Box::nb_header() + 1 + 3;
+}
+
+int SrsMp4FullBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4Box::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    buf->write_1bytes(version);
+    buf->write_3bytes(flags);
+    
+    return ret;
+}
+
+int SrsMp4FullBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4Box::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if (!buf->require(4)) {
+        ret = ERROR_MP4_BOX_REQUIRE_SPACE;
+        srs_error("MP4 full box requires 4 bytes space. ret=%d", ret);
+        return ret;
+    }
+    
+    flags = (uint32_t)buf->read_4bytes();
+    
+    version = (uint8_t)((flags >> 24) & 0xff);
+    flags &= 0x00ffffff;
+    
+    // The left required size, determined by the version.
+    int lrsz = nb_header() - SrsMp4FullBox::nb_header();
+    if (!buf->require(lrsz)) {
+        ret = ERROR_MP4_BOX_REQUIRE_SPACE;
+        srs_error("MP4 full box requires %d bytes space. ret=%d", lrsz, ret);
+        return ret;
+    }
+    
+    return ret;
+}
+
 SrsMp4FileTypeBox::SrsMp4FileTypeBox()
 SrsMp4FileTypeBox::SrsMp4FileTypeBox()
 {
 {
-    type = 0x66747970; // 'ftyp'
+    type = SRS_MP4_BOX_FTYP;
     nb_compatible_brands = 0;
     nb_compatible_brands = 0;
     compatible_brands = NULL;
     compatible_brands = NULL;
     major_brand = minor_version = 0;
     major_brand = minor_version = 0;
@@ -61,9 +471,60 @@ SrsMp4FileTypeBox::~SrsMp4FileTypeBox()
     srs_freepa(compatible_brands);
     srs_freepa(compatible_brands);
 }
 }
 
 
+int SrsMp4FileTypeBox::nb_header()
+{
+    return SrsMp4Box::nb_header() + 8 + nb_compatible_brands * 4;
+}
+
+int SrsMp4FileTypeBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4Box::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    buf->write_4bytes(major_brand);
+    buf->write_4bytes(minor_version);
+    
+    for (int i = 0; i < nb_compatible_brands; i++) {
+        uint32_t& cb = compatible_brands[i];
+        buf->write_4bytes(cb);
+    }
+    
+    return ret;
+}
+
+int SrsMp4FileTypeBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4Box::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    major_brand = buf->read_4bytes();
+    minor_version = buf->read_4bytes();
+    
+    // Compatible brands to the end of the box.
+    int left = left_space(buf);
+    
+    if (left > 0) {
+        nb_compatible_brands = left / 4;
+        compatible_brands = new uint32_t[nb_compatible_brands];
+    }
+    
+    for (int i = 0; left > 0; i++, left -= 4){
+        uint32_t cb = buf->read_4bytes();
+        compatible_brands[i] = cb;
+    }
+    
+    return ret;
+}
+
 SrsMp4MediaDataBox::SrsMp4MediaDataBox()
 SrsMp4MediaDataBox::SrsMp4MediaDataBox()
 {
 {
-    type = 0x6d646174; // 'mdat'
+    type = SRS_MP4_BOX_MDAT;
     data = NULL;
     data = NULL;
     nb_data = 0;
     nb_data = 0;
 }
 }
@@ -73,18 +534,95 @@ SrsMp4MediaDataBox::~SrsMp4MediaDataBox()
     srs_freepa(data);
     srs_freepa(data);
 }
 }
 
 
+int SrsMp4MediaDataBox::nb_header()
+{
+    return SrsMp4Box::nb_header() + nb_data;
+}
+
+int SrsMp4MediaDataBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4Box::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if (nb_data) {
+        buf->write_bytes((char*)data, nb_data);
+    }
+    
+    return ret;
+}
+
+int SrsMp4MediaDataBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4Box::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    int left = left_space(buf);
+    if (left) {
+        data = new uint8_t[left];
+        buf->read_bytes((char*)data, left);
+    }
+    
+    return ret;
+}
+
 SrsMp4FreeSpaceBox::SrsMp4FreeSpaceBox()
 SrsMp4FreeSpaceBox::SrsMp4FreeSpaceBox()
 {
 {
-    type = 0x66726565; // ‘free’ or ‘skip’
+    type = SRS_MP4_BOX_FREE; // 'free' or 'skip'
+    data = NULL;
+    nb_data = 0;
 }
 }
 
 
 SrsMp4FreeSpaceBox::~SrsMp4FreeSpaceBox()
 SrsMp4FreeSpaceBox::~SrsMp4FreeSpaceBox()
 {
 {
+    srs_freepa(data);
+}
+
+int SrsMp4FreeSpaceBox::nb_header()
+{
+    return SrsMp4Box::nb_header() + nb_data;
+}
+
+int SrsMp4FreeSpaceBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4Box::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if (nb_data) {
+        buf->write_bytes((char*)data, nb_data);
+    }
+    
+    return ret;
+}
+
+int SrsMp4FreeSpaceBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4Box::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    int left = left_space(buf);
+    if (left) {
+        data = new uint8_t[left];
+        buf->read_bytes((char*)data, left);
+    }
+    
+    return ret;
 }
 }
 
 
 SrsMp4MovieBox::SrsMp4MovieBox()
 SrsMp4MovieBox::SrsMp4MovieBox()
 {
 {
-    type = 0x6d6f6f76; // 'moov'
+    type = SRS_MP4_BOX_MOOV;
 }
 }
 
 
 SrsMp4MovieBox::~SrsMp4MovieBox()
 SrsMp4MovieBox::~SrsMp4MovieBox()
@@ -93,7 +631,7 @@ SrsMp4MovieBox::~SrsMp4MovieBox()
 
 
 SrsMp4MovieHeaderBox::SrsMp4MovieHeaderBox()
 SrsMp4MovieHeaderBox::SrsMp4MovieHeaderBox()
 {
 {
-    type = 0x6d766864; // 'mvhd'
+    type = SRS_MP4_BOX_MVHD;
     
     
     rate = 0x00010000; // typically 1.0
     rate = 0x00010000; // typically 1.0
     volume = 0x0100; // typically, full volume
     volume = 0x0100; // typically, full volume
@@ -110,9 +648,92 @@ SrsMp4MovieHeaderBox::~SrsMp4MovieHeaderBox()
 {
 {
 }
 }
 
 
+int SrsMp4MovieHeaderBox::nb_header()
+{
+    int size = SrsMp4FullBox::nb_header();
+    
+    if (version == 1) {
+        size += 8+8+4+8;
+    } else {
+        size += 4+4+4+4;
+    }
+    
+    size += 4+2+2+8+36+24+4;
+    
+    return size;
+}
+
+int SrsMp4MovieHeaderBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if (version == 1) {
+        buf->write_8bytes(creation_time);
+        buf->write_8bytes(modification_time);
+        buf->write_4bytes(timescale);
+        buf->write_8bytes(duration);
+    } else {
+        buf->write_4bytes((uint32_t)creation_time);
+        buf->write_4bytes((uint32_t)modification_time);
+        buf->write_4bytes(timescale);
+        buf->write_4bytes((uint32_t)duration);
+    }
+    
+    buf->write_4bytes(rate);
+    buf->write_2bytes(volume);
+    buf->write_2bytes(reserved0);
+    buf->write_8bytes(reserved1);
+    for (int i = 0; i < 9; i++) {
+        buf->write_4bytes(matrix[i]);
+    }
+    for (int i = 0; i < 6; i++) {
+        buf->write_4bytes(pre_defined[i]);
+    }
+    buf->write_4bytes(next_track_ID);
+    
+    return ret;
+}
+
+int SrsMp4MovieHeaderBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if (version == 1) {
+        creation_time = buf->read_8bytes();
+        modification_time = buf->read_8bytes();
+        timescale = buf->read_4bytes();
+        duration = buf->read_8bytes();
+    } else {
+        creation_time = buf->read_4bytes();
+        modification_time = buf->read_4bytes();
+        timescale = buf->read_4bytes();
+        duration = buf->read_4bytes();
+    }
+    
+    rate = buf->read_4bytes();
+    volume = buf->read_4bytes();
+    buf->skip(2);
+    buf->skip(8);
+    for (int i = 0; i < 9; i++) {
+        matrix[i] = buf->read_4bytes();
+    }
+    buf->skip(24);
+    next_track_ID = buf->read_4bytes();
+    
+    return ret;
+}
+
 SrsMp4TrackBox::SrsMp4TrackBox()
 SrsMp4TrackBox::SrsMp4TrackBox()
 {
 {
-    type = 0x7472616b; // 'trak'
+    type = SRS_MP4_BOX_TRAK;
 }
 }
 
 
 SrsMp4TrackBox::~SrsMp4TrackBox()
 SrsMp4TrackBox::~SrsMp4TrackBox()
@@ -121,13 +742,13 @@ SrsMp4TrackBox::~SrsMp4TrackBox()
 
 
 SrsMp4TrackHeaderBox::SrsMp4TrackHeaderBox()
 SrsMp4TrackHeaderBox::SrsMp4TrackHeaderBox()
 {
 {
-    type = 0x746b6864; // 'tkhd'
+    type = SRS_MP4_BOX_TKHD;
     
     
     reserved0 = 0;
     reserved0 = 0;
     reserved1 = 0;
     reserved1 = 0;
     reserved2 = 0;
     reserved2 = 0;
     layer = alternate_group = 0;
     layer = alternate_group = 0;
-    volume = 0x0100; // if track_is_audio 0x0100 else 0
+    volume = 0; // if track_is_audio 0x0100 else 0
     
     
     int32_t v[] = {0x00010000, 0, 0, 0, 0x00010000, 0, 0, 0, 0x40000000};
     int32_t v[] = {0x00010000, 0, 0, 0, 0x00010000, 0, 0, 0, 0x40000000};
     memcpy(matrix, v, 36);
     memcpy(matrix, v, 36);
@@ -137,214 +758,1012 @@ SrsMp4TrackHeaderBox::~SrsMp4TrackHeaderBox()
 {
 {
 }
 }
 
 
-SrsMp4EditBox::SrsMp4EditBox()
+int SrsMp4TrackHeaderBox::nb_header()
 {
 {
-    type = 0x65647473; // 'edts'
-}
+    int size = SrsMp4FullBox::nb_header();
     
     
-SrsMp4EditBox::~SrsMp4EditBox()
-{
+    if (version == 1) {
+        size += 8+8+4+4+8;
+    } else {
+        size += 4+4+4+4+4;
+    }
+    
+    size += 8+2+2+2+2+36+4+4;
+    
+    return size;
 }
 }
 
 
-SrsMp4ElstEntry::SrsMp4ElstEntry()
+int SrsMp4TrackHeaderBox::encode_header(SrsBuffer* buf)
 {
 {
-    media_rate_fraction = 0;
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if (version == 1) {
+        buf->write_8bytes(creation_time);
+        buf->write_8bytes(modification_time);
+        buf->write_4bytes(track_ID);
+        buf->write_4bytes(reserved0);
+        buf->write_8bytes(duration);
+    } else {
+        buf->write_4bytes((uint32_t)creation_time);
+        buf->write_4bytes((uint32_t)modification_time);
+        buf->write_4bytes(track_ID);
+        buf->write_4bytes(reserved0);
+        buf->write_4bytes((uint32_t)duration);
+    }
+    
+    buf->write_8bytes(reserved1);
+    buf->write_2bytes(layer);
+    buf->write_2bytes(alternate_group);
+    buf->write_2bytes(volume);
+    buf->write_2bytes(reserved2);
+    for (int i = 0; i < 9; i++) {
+        buf->write_4bytes(matrix[i]);
+    }
+    buf->write_4bytes(width);
+    buf->write_4bytes(height);
+    
+    return ret;
 }
 }
 
 
-SrsMp4EditListBox::SrsMp4EditListBox()
+int SrsMp4TrackHeaderBox::decode_header(SrsBuffer* buf)
 {
 {
-    type = 0x656c7374; // 'elst'
+    int ret = ERROR_SUCCESS;
     
     
-    entry_count = 0;
-    entries = NULL;
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if (version == 1) {
+        creation_time = buf->read_8bytes();
+        modification_time = buf->read_8bytes();
+        track_ID = buf->read_4bytes();
+        buf->skip(4);
+        duration = buf->read_8bytes();
+    } else {
+        creation_time = buf->read_4bytes();
+        modification_time = buf->read_4bytes();
+        track_ID = buf->read_4bytes();
+        buf->skip(4);
+        duration = buf->read_4bytes();
+    }
+    
+    buf->skip(8);
+    layer = buf->read_2bytes();
+    alternate_group = buf->read_2bytes();
+    volume = buf->read_2bytes();
+    buf->skip(2);
+    for (int i = 0; i < 9; i++) {
+        matrix[i] = buf->read_4bytes();
+    }
+    width = buf->read_4bytes();
+    height = buf->read_4bytes();
+    
+    return ret;
 }
 }
 
 
-SrsMp4EditListBox::~SrsMp4EditListBox()
+SrsMp4EditBox::SrsMp4EditBox()
 {
 {
-    srs_freepa(entries);
+    type = SRS_MP4_BOX_EDTS;
 }
 }
 
 
-SrsMp4MediaBox::SrsMp4MediaBox()
+SrsMp4EditBox::~SrsMp4EditBox()
 {
 {
-    type = 0x6d646961; // 'mdia'
 }
 }
 
 
-SrsMp4MediaBox::~SrsMp4MediaBox()
+SrsMp4ElstEntry::SrsMp4ElstEntry()
 {
 {
+    media_rate_fraction = 0;
 }
 }
 
 
-SrsMp4MediaHeaderBox::SrsMp4MediaHeaderBox()
+int SrsMp4ElstEntry::nb_header(uint32_t version)
 {
 {
-    type = 0x6d646864; // 'mdhd'
+    int size = 0;
     
     
-    pad = 0;
-    pre_defined = 0;
+    if (version == 1) {
+        size += 8+8;
+    } else {
+        size += 4+4;
+    }
+    
+    size += 2+2;
+    
+    return size;
+}
+
+int SrsMp4ElstEntry::encode_header(SrsBuffer* buf, uint32_t version)
+{
+    if (version == 1) {
+        buf->write_8bytes(segment_duration);
+        buf->write_8bytes(media_time);
+    } else {
+        buf->write_4bytes((uint32_t)segment_duration);
+        buf->write_4bytes((int32_t)media_time);
+    }
+    
+    buf->write_2bytes(media_rate_integer);
+    buf->write_2bytes(media_rate_fraction);
+    
+    return ERROR_SUCCESS;
+}
+
+int SrsMp4ElstEntry::decode_header(SrsBuffer* buf, uint32_t version)
+{
+    if (version == 1) {
+        segment_duration = buf->read_8bytes();
+        media_time = buf->read_8bytes();
+    } else {
+        segment_duration = buf->read_4bytes();
+        media_time = buf->read_4bytes();
+    }
+    
+    media_rate_integer = buf->read_2bytes();
+    media_rate_fraction = buf->read_2bytes();
+    
+    return ERROR_SUCCESS;
+}
+
+SrsMp4EditListBox::SrsMp4EditListBox()
+{
+    type = SRS_MP4_BOX_ELST;
+    
+    entry_count = 0;
+    entries = NULL;
+}
+
+SrsMp4EditListBox::~SrsMp4EditListBox()
+{
+    srs_freepa(entries);
+}
+
+int SrsMp4EditListBox::nb_header()
+{
+    int size = SrsMp4FullBox::nb_header();
+    
+    for (uint32_t i = 0; i < entry_count; i++) {
+        SrsMp4ElstEntry& entry = entries[i];
+        size += entry.nb_header(version);
+    }
+    
+    return size;
+}
+
+int SrsMp4EditListBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    for (uint32_t i = 0; i < entry_count; i++) {
+        SrsMp4ElstEntry& entry = entries[i];
+        if ((ret = entry.encode_header(buf, version)) != ERROR_SUCCESS) {
+            return ret;
+        }
+    }
+    
+    return ret;
+}
+
+int SrsMp4EditListBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    int left = left_space(buf);
+    entry_count = left / SrsMp4ElstEntry().nb_header(version);
+    if (entry_count > 0) {
+        entries = new SrsMp4ElstEntry[entry_count];
+    }
+    for (int i = 0; i < entry_count; i++) {
+        SrsMp4ElstEntry& entry = entries[i];
+        if ((ret = entry.decode_header(buf, version)) != ERROR_SUCCESS) {
+            return ret;
+        }
+    }
+    
+    return ret;
+}
+
+SrsMp4MediaBox::SrsMp4MediaBox()
+{
+    type = SRS_MP4_BOX_MDIA;
+}
+
+SrsMp4MediaBox::~SrsMp4MediaBox()
+{
+}
+
+SrsMp4MediaHeaderBox::SrsMp4MediaHeaderBox()
+{
+    type = SRS_MP4_BOX_MDHD;
+    language = 0;
+    pre_defined = 0;
 }
 }
 
 
 SrsMp4MediaHeaderBox::~SrsMp4MediaHeaderBox()
 SrsMp4MediaHeaderBox::~SrsMp4MediaHeaderBox()
 {
 {
 }
 }
 
 
+uint8_t SrsMp4MediaHeaderBox::language0()
+{
+    return (language >> 10) & 0x1f;
+}
+
+void SrsMp4MediaHeaderBox::set_language0(uint8_t v)
+{
+    language |= uint16_t(v & 0x1f) << 10;
+}
+
+uint8_t SrsMp4MediaHeaderBox::language1()
+{
+    return (language >> 5) & 0x1f;
+}
+
+void SrsMp4MediaHeaderBox::set_language1(uint8_t v)
+{
+    language |= uint16_t(v & 0x1f) << 5;
+}
+
+uint8_t SrsMp4MediaHeaderBox::language2()
+{
+    return language & 0x1f;
+}
+
+void SrsMp4MediaHeaderBox::set_language2(uint8_t v)
+{
+    language |= uint16_t(v & 0x1f);
+}
+
+int SrsMp4MediaHeaderBox::nb_header()
+{
+    int size = SrsMp4FullBox::nb_header();
+    
+    if (version == 1) {
+        size += 8+8+4+8;
+    } else {
+        size += 4+4+4+4;
+    }
+    
+    size += 2+2;
+    
+    return size;
+}
+
+int SrsMp4MediaHeaderBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if (version == 1) {
+        buf->write_8bytes(creation_time);
+        buf->write_8bytes(modification_time);
+        buf->write_4bytes(timescale);
+        buf->write_8bytes(duration);
+    } else {
+        buf->write_4bytes((uint32_t)creation_time);
+        buf->write_4bytes((uint32_t)modification_time);
+        buf->write_4bytes(timescale);
+        buf->write_4bytes((uint32_t)duration);
+    }
+    
+    buf->write_2bytes(language);
+    buf->write_2bytes(pre_defined);
+    
+    return ret;
+}
+
+int SrsMp4MediaHeaderBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if (version == 1) {
+        creation_time = buf->read_8bytes();
+        modification_time = buf->read_8bytes();
+        timescale = buf->read_4bytes();
+        duration = buf->read_8bytes();
+    } else {
+        creation_time = buf->read_4bytes();
+        modification_time = buf->read_4bytes();
+        timescale = buf->read_4bytes();
+        duration = buf->read_4bytes();
+    }
+    
+    language = buf->read_2bytes();
+    buf->skip(2);
+    
+    return ret;
+}
+
 SrsMp4HandlerReferenceBox::SrsMp4HandlerReferenceBox()
 SrsMp4HandlerReferenceBox::SrsMp4HandlerReferenceBox()
 {
 {
-    type = 0x68646c72; // 'hdlr'
+    type = SRS_MP4_BOX_HDLR;
     
     
     pre_defined = 0;
     pre_defined = 0;
     memset(reserved, 0, 12);
     memset(reserved, 0, 12);
 }
 }
 
 
-SrsMp4HandlerReferenceBox::~SrsMp4HandlerReferenceBox()
+SrsMp4HandlerReferenceBox::~SrsMp4HandlerReferenceBox()
+{
+}
+
+int SrsMp4HandlerReferenceBox::nb_header()
+{
+    return SrsMp4FullBox::nb_header()+4+4+12+srs_mp4_string_length(name);
+}
+
+int SrsMp4HandlerReferenceBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    buf->write_4bytes(pre_defined);
+    buf->write_4bytes(handler_type);
+    buf->write_4bytes(reserved[0]);
+    buf->write_4bytes(reserved[1]);
+    buf->write_4bytes(reserved[2]);
+    srs_mp4_string_write(buf, name);
+    
+    return ret;
+}
+
+int SrsMp4HandlerReferenceBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    buf->skip(4);
+    handler_type = buf->read_4bytes();
+    buf->skip(12);
+    
+    if ((ret = srs_mp4_string_read(buf, name, left_space(buf))) != ERROR_SUCCESS) {
+        srs_error("MP4 hdlr read string failed. ret=%d", ret);
+        return ret;
+    }
+    
+    return ret;
+}
+
+SrsMp4MediaInformationBox::SrsMp4MediaInformationBox()
+{
+    type = SRS_MP4_BOX_MINF;
+}
+
+SrsMp4MediaInformationBox::~SrsMp4MediaInformationBox()
+{
+}
+
+SrsMp4VideoMeidaHeaderBox::SrsMp4VideoMeidaHeaderBox()
+{
+    type = SRS_MP4_BOX_VMHD;
+    version = 0;
+    flags = 1;
+    
+    graphicsmode = 0;
+    memset(opcolor, 0, 6);
+}
+
+SrsMp4VideoMeidaHeaderBox::~SrsMp4VideoMeidaHeaderBox()
+{
+}
+
+int SrsMp4VideoMeidaHeaderBox::nb_header()
+{
+    return SrsMp4FullBox::nb_header()+2+6;
+}
+
+int SrsMp4VideoMeidaHeaderBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    buf->write_2bytes(graphicsmode);
+    buf->write_2bytes(opcolor[0]);
+    buf->write_2bytes(opcolor[1]);
+    buf->write_2bytes(opcolor[2]);
+    
+    return ret;
+}
+
+int SrsMp4VideoMeidaHeaderBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+                              
+    graphicsmode = buf->read_2bytes();
+    opcolor[0] = buf->read_2bytes();
+    opcolor[1] = buf->read_2bytes();
+    opcolor[2] = buf->read_2bytes();
+    
+    return ret;
+}
+
+SrsMp4SoundMeidaHeaderBox::SrsMp4SoundMeidaHeaderBox()
+{
+    type = SRS_MP4_BOX_SMHD;
+    
+    reserved = balance = 0;
+}
+
+SrsMp4SoundMeidaHeaderBox::~SrsMp4SoundMeidaHeaderBox()
+{
+}
+
+int SrsMp4SoundMeidaHeaderBox::nb_header()
+{
+    return SrsMp4FullBox::nb_header()+2+2;
+}
+
+int SrsMp4SoundMeidaHeaderBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    buf->write_2bytes(balance);
+    buf->write_2bytes(reserved);
+    
+    return ret;
+}
+
+int SrsMp4SoundMeidaHeaderBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    balance = buf->read_2bytes();
+    buf->skip(2);
+    
+    return ret;
+}
+
+SrsMp4DataInformationBox::SrsMp4DataInformationBox()
+{
+    type = SRS_MP4_BOX_DINF;
+}
+
+SrsMp4DataInformationBox::~SrsMp4DataInformationBox()
+{
+}
+
+SrsMp4DataEntryBox::SrsMp4DataEntryBox()
+{
+}
+
+SrsMp4DataEntryBox::~SrsMp4DataEntryBox()
+{
+}
+
+int SrsMp4DataEntryBox::nb_header()
+{
+    return SrsMp4FullBox::nb_header()+srs_mp4_string_length(location);
+}
+
+int SrsMp4DataEntryBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    srs_mp4_string_write(buf, location);
+    
+    return ret;
+}
+
+int SrsMp4DataEntryBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if ((ret = srs_mp4_string_read(buf, location, left_space(buf))) != ERROR_SUCCESS) {
+        srs_error("MP4 urx read string failed. ret=%d", ret);
+        return ret;
+    }
+    
+    return ret;
+}
+
+SrsMp4DataEntryUrlBox::SrsMp4DataEntryUrlBox()
+{
+    type = SRS_MP4_BOX_URL;
+}
+
+SrsMp4DataEntryUrlBox::~SrsMp4DataEntryUrlBox()
+{
+}
+
+SrsMp4DataEntryUrnBox::SrsMp4DataEntryUrnBox()
+{
+    type = SRS_MP4_BOX_URN;
+}
+
+SrsMp4DataEntryUrnBox::~SrsMp4DataEntryUrnBox()
+{
+}
+
+int SrsMp4DataEntryUrnBox::nb_header()
+{
+    return SrsMp4DataEntryBox::nb_header()+srs_mp4_string_length(name);
+}
+
+int SrsMp4DataEntryUrnBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4DataEntryBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    srs_mp4_string_write(buf, name);
+    
+    return ret;
+}
+
+int SrsMp4DataEntryUrnBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4DataEntryBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if ((ret = srs_mp4_string_read(buf, name, left_space(buf))) != ERROR_SUCCESS) {
+        srs_error("MP4 urn read string failed. ret=%d", ret);
+        return ret;
+    }
+    
+    return ret;
+}
+
+SrsMp4DataReferenceBox::SrsMp4DataReferenceBox()
+{
+    type = SRS_MP4_BOX_DREF;
+}
+
+SrsMp4DataReferenceBox::~SrsMp4DataReferenceBox()
+{
+    vector<SrsMp4DataEntryBox*>::iterator it;
+    for (it = entries.begin(); it != entries.end(); ++it) {
+        SrsMp4DataEntryBox* entry = *it;
+        srs_freep(entry);
+    }
+    entries.clear();
+}
+
+uint32_t SrsMp4DataReferenceBox::entry_count()
+{
+    return (uint32_t)entries.size();
+}
+
+SrsMp4DataEntryBox* SrsMp4DataReferenceBox::entry_at(int index)
+{
+    return entries.at(index);
+}
+
+int SrsMp4DataReferenceBox::nb_header()
+{
+    int size = SrsMp4FullBox::nb_header();
+    
+    size += 4;
+    
+    vector<SrsMp4DataEntryBox*>::iterator it;
+    for (it = entries.begin(); it != entries.end(); ++it) {
+        SrsMp4DataEntryBox* entry = *it;
+        size += entry->nb_bytes();
+    }
+    
+    return size;
+}
+
+int SrsMp4DataReferenceBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    buf->write_4bytes((int32_t)entries.size());
+    
+    vector<SrsMp4DataEntryBox*>::iterator it;
+    for (it = entries.begin(); it != entries.end(); ++it) {
+        SrsMp4DataEntryBox* entry = *it;
+        if ((ret = entry->encode(buf)) != ERROR_SUCCESS) {
+            return ret;
+        }
+    }
+    
+    return ret;
+}
+
+int SrsMp4DataReferenceBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    int left = left_space(buf);
+    while (left > 0) {
+        SrsMp4Box* box = NULL;
+        if ((ret = SrsMp4Box::discovery(buf, &box)) != ERROR_SUCCESS) {
+            return ret;
+        }
+        
+        int pos = buf->pos();
+        if ((ret = box->decode(buf)) != ERROR_SUCCESS) {
+            return ret;
+        }
+        left -= buf->pos() - pos;
+        
+        SrsMp4FullBox* fbox = dynamic_cast<SrsMp4FullBox*>(box);
+        if (fbox) {
+            fbox->version = version;
+            fbox->flags = flags;
+        }
+        
+        if (box->type == SRS_MP4_BOX_URL) {
+            entries.push_back(dynamic_cast<SrsMp4DataEntryUrlBox*>(box));
+        } else if (box->type == SRS_MP4_BOX_URN) {
+            entries.push_back(dynamic_cast<SrsMp4DataEntryUrnBox*>(box));
+        } else {
+            srs_freep(box);
+        }
+    }
+    
+    return ret;
+}
+
+SrsMp4SampleTableBox::SrsMp4SampleTableBox()
+{
+    type = SRS_MP4_BOX_STBL;
+}
+
+SrsMp4SampleTableBox::~SrsMp4SampleTableBox()
+{
+}
+
+SrsMp4SampleEntry::SrsMp4SampleEntry()
+{
+    memset(reserved, 0, 6);
+}
+
+SrsMp4SampleEntry::~SrsMp4SampleEntry()
 {
 {
 }
 }
 
 
-SrsMp4MediaInformationBox::SrsMp4MediaInformationBox()
+int SrsMp4SampleEntry::nb_header()
 {
 {
-    type = 0x6d696e66; // 'minf'
+    return SrsMp4Box::nb_header()+6+2;
 }
 }
 
 
-SrsMp4MediaInformationBox::~SrsMp4MediaInformationBox()
+int SrsMp4SampleEntry::encode_header(SrsBuffer* buf)
 {
 {
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4Box::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    for (int i = 0; i < 6; i++) {
+        buf->write_1bytes(reserved[i]);
+    }
+    buf->write_2bytes(data_reference_index);
+    
+    return ret;
 }
 }
 
 
-SrsMp4VideoMeidaHeaderBox::SrsMp4VideoMeidaHeaderBox()
+int SrsMp4SampleEntry::decode_header(SrsBuffer* buf)
 {
 {
-    type = 0x766d6864; // 'vmhd'
-    version = 0;
-    flags = 1;
+    int ret = ERROR_SUCCESS;
     
     
-    graphicsmode = 0;
-    memset(opcolor, 0, 6);
+    if ((ret = SrsMp4Box::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    buf->skip(6);
+    data_reference_index = buf->read_2bytes();
+    
+    return ret;
 }
 }
 
 
-SrsMp4VideoMeidaHeaderBox::~SrsMp4VideoMeidaHeaderBox()
+SrsMp4VisualSampleEntry::SrsMp4VisualSampleEntry()
 {
 {
+    pre_defined0 = 0;
+    reserved0 = 0;
+    reserved1 = 0;
+    memset(pre_defined1, 0, 12);
+    memset(compressorname, 0, 32);
+    frame_count = 1;
+    horizresolution = 0x00480000; // 72 dpi
+    vertresolution = 0x00480000; // 72 dpi
+    depth = 0x0018;
+    pre_defined2 = -1;
 }
 }
 
 
-SrsMp4SoundMeidaHeaderBox::SrsMp4SoundMeidaHeaderBox()
+SrsMp4VisualSampleEntry::~SrsMp4VisualSampleEntry()
 {
 {
-    type = 0x736d6864; // 'smhd'
-    
-    reserved = balance = 0;
 }
 }
 
 
-SrsMp4SoundMeidaHeaderBox::~SrsMp4SoundMeidaHeaderBox()
+int SrsMp4VisualSampleEntry::nb_header()
 {
 {
+    return SrsMp4SampleEntry::nb_header()+2+2+12+2+2+4+4+4+2+32+2+2;
 }
 }
 
 
-SrsMp4DataInformationBox::SrsMp4DataInformationBox()
+int SrsMp4VisualSampleEntry::encode_header(SrsBuffer* buf)
 {
 {
-    type = 0x64696e66; // 'dinf'
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4SampleEntry::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    buf->write_2bytes(pre_defined0);
+    buf->write_2bytes(reserved0);
+    buf->write_4bytes(pre_defined1[0]);
+    buf->write_4bytes(pre_defined1[1]);
+    buf->write_4bytes(pre_defined1[2]);
+    buf->write_2bytes(width);
+    buf->write_2bytes(height);
+    buf->write_4bytes(horizresolution);
+    buf->write_4bytes(vertresolution);
+    buf->write_4bytes(reserved1);
+    buf->write_2bytes(frame_count);
+    buf->write_bytes(compressorname, 32);
+    buf->write_2bytes(depth);
+    buf->write_2bytes(pre_defined2);
+    
+    return ret;
 }
 }
 
 
-SrsMp4DataInformationBox::~SrsMp4DataInformationBox()
+int SrsMp4VisualSampleEntry::decode_header(SrsBuffer* buf)
 {
 {
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4SampleEntry::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    buf->skip(2);
+    buf->skip(2);
+    buf->skip(12);
+    width = buf->read_2bytes();
+    height = buf->read_2bytes();
+    horizresolution = buf->read_4bytes();
+    vertresolution = buf->read_4bytes();
+    buf->skip(4);
+    frame_count = buf->read_2bytes();
+    buf->read_bytes(compressorname, 32);
+    depth = buf->read_2bytes();
+    buf->skip(2);
+    
+    return ret;
 }
 }
 
 
-SrsMp4DataEntryBox::SrsMp4DataEntryBox()
+SrsMp4AudioSampleEntry::SrsMp4AudioSampleEntry()
 {
 {
+    reserved0 = 0;
+    pre_defined0 = 0;
+    reserved1 = 0;
+    channelcount = 2;
+    samplesize = 16;
 }
 }
 
 
-SrsMp4DataEntryUrlBox::SrsMp4DataEntryUrlBox()
+SrsMp4AudioSampleEntry::~SrsMp4AudioSampleEntry()
 {
 {
-    type = 0x75726c20; // 'url '
 }
 }
 
 
-SrsMp4DataEntryUrnBox::SrsMp4DataEntryUrnBox()
+int SrsMp4AudioSampleEntry::nb_header()
 {
 {
-    type = 0x75726e20; // 'urn '
+    return SrsMp4SampleEntry::nb_header()+8+2+2+2+2+4;
 }
 }
 
 
-SrsMp4DataReferenceBox::SrsMp4DataReferenceBox()
+int SrsMp4AudioSampleEntry::encode_header(SrsBuffer* buf)
 {
 {
-    type = 0x64726566; // 'dref'
+    int ret = ERROR_SUCCESS;
     
     
-    entry_count = 0;
-    entries = NULL;
+    if ((ret = SrsMp4SampleEntry::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    buf->write_8bytes(reserved0);
+    buf->write_2bytes(channelcount);
+    buf->write_2bytes(samplesize);
+    buf->write_2bytes(pre_defined0);
+    buf->write_2bytes(reserved1);
+    buf->write_4bytes(samplerate);
+    
+    return ret;
 }
 }
 
 
-SrsMp4DataReferenceBox::~SrsMp4DataReferenceBox()
+int SrsMp4AudioSampleEntry::decode_header(SrsBuffer* buf)
 {
 {
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4SampleEntry::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    buf->skip(8);
+    channelcount = buf->read_2bytes();
+    samplesize = buf->read_2bytes();
+    buf->skip(2);
+    buf->skip(2);
+    samplerate = buf->read_4bytes();
+    
+    return ret;
 }
 }
 
 
-SrsMp4SampleTableBox::SrsMp4SampleTableBox()
+SrsMp4SampleDescriptionBox::SrsMp4SampleDescriptionBox()
 {
 {
-    type = 0x7374626c; // 'stbl'
+    type = SRS_MP4_BOX_STSD;
 }
 }
 
 
-SrsMp4SampleTableBox::~SrsMp4SampleTableBox()
+SrsMp4SampleDescriptionBox::~SrsMp4SampleDescriptionBox()
 {
 {
+    vector<SrsMp4SampleEntry*>::iterator it;
+    for (it = entries.begin(); it != entries.end(); ++it) {
+        SrsMp4SampleEntry* entry = *it;
+        srs_freep(entry);
+    }
+    entries.clear();
 }
 }
 
 
-SrsMp4SampleEntry::SrsMp4SampleEntry()
+uint32_t SrsMp4SampleDescriptionBox::entry_count()
 {
 {
-    memset(reserved, 0, 6);
+    return (uint32_t)entries.size();
 }
 }
 
 
-SrsMp4SampleEntry::~SrsMp4SampleEntry()
+SrsMp4SampleEntry* SrsMp4SampleDescriptionBox::entrie_at(int index)
 {
 {
+    return entries.at(index);
 }
 }
 
 
-SrsMp4VisualSampleEntry::SrsMp4VisualSampleEntry()
+int SrsMp4SampleDescriptionBox::nb_header()
 {
 {
-    pre_defined0 = 0;
-    reserved0 = 0;
-    reserved1 = 0;
-    memset(pre_defined1, 0, 12);
-    memset(compressorname, 0, 32);
-    frame_count = 1;
-    horizresolution = 0x00480000; // 72 dpi
-    vertresolution = 0x00480000; // 72 dpi
-    depth = 0x0018;
-    pre_defined2 = -1;
+    int size = SrsMp4FullBox::nb_header();
+    
+    vector<SrsMp4SampleEntry*>::iterator it;
+    for (it = entries.begin(); it != entries.end(); ++it) {
+        SrsMp4SampleEntry* entry = *it;
+        size += entry->nb_bytes();
+    }
+    
+    return size;
 }
 }
 
 
-SrsMp4VisualSampleEntry::~SrsMp4VisualSampleEntry()
+int SrsMp4SampleDescriptionBox::encode_header(SrsBuffer* buf)
 {
 {
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    vector<SrsMp4SampleEntry*>::iterator it;
+    for (it = entries.begin(); it != entries.end(); ++it) {
+        SrsMp4SampleEntry* entry = *it;
+        if ((ret = entry->encode(buf)) != ERROR_SUCCESS) {
+            return ret;
+        }
+    }
+    
+    return ret;
 }
 }
 
 
-SrsMp4AudioSampleEntry::SrsMp4AudioSampleEntry()
+int SrsMp4SampleDescriptionBox::decode_header(SrsBuffer* buf)
 {
 {
-    memset(reserved0, 0, 8);
-    pre_defined0 = 0;
-    reserved1 = 0;
-    channelcount = 2;
-    samplesize = 16;
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    int left = left_space(buf);
+    while (left > 0) {
+        SrsMp4Box* box = NULL;
+        if ((ret = SrsMp4Box::discovery(buf, &box)) != ERROR_SUCCESS) {
+            return ret;
+        }
+        
+        int pos = buf->pos();
+        if ((ret = box->decode(buf)) != ERROR_SUCCESS) {
+            return ret;
+        }
+        left -= buf->pos() - pos;
+        
+        SrsMp4SampleEntry* entry = dynamic_cast<SrsMp4SampleEntry*>(box);
+        if (entry) {
+            entries.push_back(entry);
+        } else {
+            srs_freep(box);
+        }
+    }
+    
+    return ret;
 }
 }
 
 
-SrsMp4AudioSampleEntry::~SrsMp4AudioSampleEntry()
+SrsMp4SttsEntry::SrsMp4SttsEntry()
 {
 {
+    sample_count = 0;
+    sample_delta = 0;
 }
 }
 
 
-SrsMp4SampleDescriptionBox::SrsMp4SampleDescriptionBox()
+SrsMp4DecodingTime2SampleBox::SrsMp4DecodingTime2SampleBox()
 {
 {
-    type = 0x73747364; // 'stsd'
+    type = SRS_MP4_BOX_STTS;
     
     
     entry_count = 0;
     entry_count = 0;
     entries = NULL;
     entries = NULL;
 }
 }
 
 
-SrsMp4SampleDescriptionBox::~SrsMp4SampleDescriptionBox()
+SrsMp4DecodingTime2SampleBox::~SrsMp4DecodingTime2SampleBox()
 {
 {
     srs_freepa(entries);
     srs_freepa(entries);
 }
 }
 
 
-SrsMp4SttsEntry::SrsMp4SttsEntry()
+int SrsMp4DecodingTime2SampleBox::nb_header()
 {
 {
-    sample_count = 0;
-    sample_delta = 0;
+    return SrsMp4FullBox::nb_header();
 }
 }
 
 
-SrsMp4DecodingTime2SampleBox::SrsMp4DecodingTime2SampleBox()
+int SrsMp4DecodingTime2SampleBox::encode_header(SrsBuffer* buf)
 {
 {
-    type = 0x73747473; // 'stts'
+    int ret = ERROR_SUCCESS;
     
     
-    entry_count = 0;
-    entries = NULL;
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return ret;
 }
 }
 
 
-SrsMp4DecodingTime2SampleBox::~SrsMp4DecodingTime2SampleBox()
+int SrsMp4DecodingTime2SampleBox::decode_header(SrsBuffer* buf)
 {
 {
-    srs_freepa(entries);
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return ret;
 }
 }
 
 
 SrsMp4CttsEntry::SrsMp4CttsEntry()
 SrsMp4CttsEntry::SrsMp4CttsEntry()
@@ -355,7 +1774,7 @@ SrsMp4CttsEntry::SrsMp4CttsEntry()
 
 
 SrsMp4CompositionTime2SampleBox::SrsMp4CompositionTime2SampleBox()
 SrsMp4CompositionTime2SampleBox::SrsMp4CompositionTime2SampleBox()
 {
 {
-    type = 0x63747473; // 'ctts'
+    type = SRS_MP4_BOX_CTTS;
     
     
     entry_count = 0;
     entry_count = 0;
     entries = NULL;
     entries = NULL;
@@ -366,9 +1785,36 @@ SrsMp4CompositionTime2SampleBox::~SrsMp4CompositionTime2SampleBox()
     srs_freepa(entries);
     srs_freepa(entries);
 }
 }
 
 
+int SrsMp4CompositionTime2SampleBox::nb_header()
+{
+    return SrsMp4FullBox::nb_header();
+}
+
+int SrsMp4CompositionTime2SampleBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return ret;
+}
+
+int SrsMp4CompositionTime2SampleBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return ret;
+}
+
 SrsMp4SyncSampleBox::SrsMp4SyncSampleBox()
 SrsMp4SyncSampleBox::SrsMp4SyncSampleBox()
 {
 {
-    type = 0x73747373; // 'stss'
+    type = SRS_MP4_BOX_STSS;
     
     
     entry_count = 0;
     entry_count = 0;
     sample_numbers = NULL;
     sample_numbers = NULL;
@@ -379,6 +1825,33 @@ SrsMp4SyncSampleBox::~SrsMp4SyncSampleBox()
     srs_freepa(sample_numbers);
     srs_freepa(sample_numbers);
 }
 }
 
 
+int SrsMp4SyncSampleBox::nb_header()
+{
+    return SrsMp4FullBox::nb_header();
+}
+
+int SrsMp4SyncSampleBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return ret;
+}
+
+int SrsMp4SyncSampleBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return ret;
+}
+
 SrsMp4StscEntry::SrsMp4StscEntry()
 SrsMp4StscEntry::SrsMp4StscEntry()
 {
 {
     first_chunk = 0;
     first_chunk = 0;
@@ -388,7 +1861,7 @@ SrsMp4StscEntry::SrsMp4StscEntry()
 
 
 SrsMp4Sample2ChunkBox::SrsMp4Sample2ChunkBox()
 SrsMp4Sample2ChunkBox::SrsMp4Sample2ChunkBox()
 {
 {
-    type = 0x73747363; // 'stsc'
+    type = SRS_MP4_BOX_STSC;
     
     
     entry_count = 0;
     entry_count = 0;
     entries = NULL;
     entries = NULL;
@@ -399,9 +1872,36 @@ SrsMp4Sample2ChunkBox::~SrsMp4Sample2ChunkBox()
     srs_freepa(entries);
     srs_freepa(entries);
 }
 }
 
 
+int SrsMp4Sample2ChunkBox::nb_header()
+{
+    return SrsMp4FullBox::nb_header();
+}
+
+int SrsMp4Sample2ChunkBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return ret;
+}
+
+int SrsMp4Sample2ChunkBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return ret;
+}
+
 SrsMp4ChunkOffsetBox::SrsMp4ChunkOffsetBox()
 SrsMp4ChunkOffsetBox::SrsMp4ChunkOffsetBox()
 {
 {
-    type = 0x7374636f; // 'stco'
+    type = SRS_MP4_BOX_STCO;
     
     
     entry_count = 0;
     entry_count = 0;
     entries = NULL;
     entries = NULL;
@@ -412,9 +1912,36 @@ SrsMp4ChunkOffsetBox::~SrsMp4ChunkOffsetBox()
     srs_freepa(entries);
     srs_freepa(entries);
 }
 }
 
 
+int SrsMp4ChunkOffsetBox::nb_header()
+{
+    return SrsMp4FullBox::nb_header();
+}
+
+int SrsMp4ChunkOffsetBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return ret;
+}
+
+int SrsMp4ChunkOffsetBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return ret;
+}
+
 SrsMp4SampleSizeBox::SrsMp4SampleSizeBox()
 SrsMp4SampleSizeBox::SrsMp4SampleSizeBox()
 {
 {
-    type = 0x7374737a; // 'stsz'
+    type = SRS_MP4_BOX_STSZ;
     
     
     sample_size = sample_count = 0;
     sample_size = sample_count = 0;
     entry_sizes = NULL;
     entry_sizes = NULL;
@@ -425,12 +1952,44 @@ SrsMp4SampleSizeBox::~SrsMp4SampleSizeBox()
     srs_freepa(entry_sizes);
     srs_freepa(entry_sizes);
 }
 }
 
 
+int SrsMp4SampleSizeBox::nb_header()
+{
+    return SrsMp4FullBox::nb_header();
+}
+
+int SrsMp4SampleSizeBox::encode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::encode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return ret;
+}
+
+int SrsMp4SampleSizeBox::decode_header(SrsBuffer* buf)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = SrsMp4FullBox::decode_header(buf)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return ret;
+}
+
 SrsMp4Decoder::SrsMp4Decoder()
 SrsMp4Decoder::SrsMp4Decoder()
 {
 {
+    reader = NULL;
+    next = NULL;
+    stream = new SrsSimpleStream();
 }
 }
 
 
 SrsMp4Decoder::~SrsMp4Decoder()
 SrsMp4Decoder::~SrsMp4Decoder()
 {
 {
+    srs_freep(next);
+    srs_freep(stream);
 }
 }
 
 
 int SrsMp4Decoder::initialize(ISrsReader* r)
 int SrsMp4Decoder::initialize(ISrsReader* r)
@@ -440,6 +1999,67 @@ int SrsMp4Decoder::initialize(ISrsReader* r)
     srs_assert(r);
     srs_assert(r);
     reader = r;
     reader = r;
     
     
+    if ((ret = load_next_box(&next)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if (next->type != SRS_MP4_BOX_FTYP) {
+        ret = ERROR_MP4_BOX_ILLEGAL_SCHEMA;
+        srs_error("MP4 first box must be FTYP, not %d. ret=%d", next->type, ret);
+        return ret;
+    }
+    
+    return ret;
+}
+
+int SrsMp4Decoder::load_next_box(SrsMp4Box** ppbox)
+{
+    int ret = ERROR_SUCCESS;
+    
+    // Ignore for already loaded.
+    if (next) {
+        return ret;
+    }
+    
+    char* buf = new char[4096];
+    SrsAutoFreeA(char, buf);
+    
+    while (true) {
+        uint64_t required = next? next->sz():4;
+        while (stream->length() < required) {
+            ssize_t nread;
+            if ((ret = reader->read(buf, 4096, &nread)) != ERROR_SUCCESS) {
+                srs_error("MP4 load failed, nread=%d, required=%d. ret=%d", nread, required, ret);
+                return ret;
+            }
+            
+            srs_assert(nread > 0);
+            stream->append(buf, (int)nread);
+        }
+        
+        SrsBuffer* buffer = new SrsBuffer(stream->bytes(), stream->length());
+        SrsAutoFree(SrsBuffer, buffer);
+        
+        // Discovery the box with basic header.
+        if (!next && (ret = SrsMp4Box::discovery(buffer, ppbox)) != ERROR_SUCCESS) {
+            if (ret == ERROR_MP4_BOX_REQUIRE_SPACE) {
+                continue;
+            }
+            srs_error("MP4 load box failed. ret=%d", ret);
+            return ret;
+        }
+        
+        // Decode util we can demux the whole box.
+        if (!buffer->require((int)next->sz())) {
+            continue;
+        }
+        ret = next->decode(buffer);
+        
+        // Remove the consumed bytes.
+        stream->erase((int)next->sz());
+        break;
+    }
+    
     return ret;
     return ret;
 }
 }
 
 

@@ -29,30 +29,77 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 */
 #include <srs_core.hpp>
 #include <srs_core.hpp>
 
 
+#include <srs_kernel_buffer.hpp>
+
 #include <string>
 #include <string>
+#include <vector>
 
 
 class ISrsReader;
 class ISrsReader;
+class SrsSimpleStream;
 
 
 /**
 /**
  * 4.2 Object Structure
  * 4.2 Object Structure
  * ISO_IEC_14496-12-base-format-2012.pdf, page 16
  * ISO_IEC_14496-12-base-format-2012.pdf, page 16
  */
  */
-class SrsMp4Box
+class SrsMp4Box : public ISrsCodec
 {
 {
-public:
+private:
+    // The size is the entire size of the box, including the size and type header, fields,
+    // and all contained boxes. This facilitates general parsing of the file.
+    //
     // if size is 1 then the actual size is in the field largesize;
     // if size is 1 then the actual size is in the field largesize;
     // if size is 0, then this box is the last one in the file, and its contents
     // if size is 0, then this box is the last one in the file, and its contents
     // extend to the end of the file (normally only used for a Media Data Box)
     // extend to the end of the file (normally only used for a Media Data Box)
-    uint32_t size;
+    uint32_t smallsize;
+    uint64_t largesize;
+public:
+    // identifies the box type; standard boxes use a compact type, which is normally four printable
+    // characters, to permit ease of identification, and is shown so in the boxes below. User extensions use
+    // an extended type; in this case, the type field is set to ‘uuid’.
     uint32_t type;
     uint32_t type;
+    // For box 'uuid'.
+    uint8_t* usertype;
+private:
+    std::vector<SrsMp4Box*> boxes;
+private:
+    // The position at buffer to start demux the box.
+    int start_pos;
 public:
 public:
     SrsMp4Box();
     SrsMp4Box();
     virtual ~SrsMp4Box();
     virtual ~SrsMp4Box();
+public:
+    // Get the size of box, whatever small or large size.
+    virtual uint64_t sz();
+    // Get the left space of box, for decoder.
+    virtual int left_space(SrsBuffer* buf);
+    /**
+     * Discovery the box from buffer.
+     * @param ppbox Output the discoveried box, which user must free it.
+     */
+    static int discovery(SrsBuffer* buf, SrsMp4Box** ppbox);
+// Interface ISrsCodec
+public:
+    virtual int nb_bytes();
+    virtual int encode(SrsBuffer* buf);
+    virtual int decode(SrsBuffer* buf);
+protected:
+    virtual int encode_boxes(SrsBuffer* buf);
+    virtual int decode_boxes(SrsBuffer* buf);
+// Sub classes can override these functions for special codec.
+protected:
+    // The size of header, not including the contained boxes.
+    virtual int nb_header();
+    // It's not necessary to check the buffer, because we already know the size in parent function,
+    // so we have checked the buffer is ok to write.
+    virtual int encode_header(SrsBuffer* buf);
+    // It's not necessary to check the buffer, unless the box is not only determined by the verson.
+    // Generally, it's not necessary, that is, all boxes is determinated by version.
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
  * 4.2 Object Structure
  * 4.2 Object Structure
- * ISO_IEC_14496-12-base-format-2012.pdf, page 16
+ * ISO_IEC_14496-12-base-format-2012.pdf, page 17
  */
  */
 class SrsMp4FullBox : public SrsMp4Box
 class SrsMp4FullBox : public SrsMp4Box
 {
 {
@@ -64,6 +111,10 @@ public:
 public:
 public:
     SrsMp4FullBox();
     SrsMp4FullBox();
     virtual ~SrsMp4FullBox();
     virtual ~SrsMp4FullBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -88,6 +139,10 @@ private:
 public:
 public:
     SrsMp4FileTypeBox();
     SrsMp4FileTypeBox();
     virtual ~SrsMp4FileTypeBox();
     virtual ~SrsMp4FileTypeBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -101,11 +156,16 @@ public:
 class SrsMp4MediaDataBox : public SrsMp4Box
 class SrsMp4MediaDataBox : public SrsMp4Box
 {
 {
 private:
 private:
+    // the contained media data
     int nb_data;
     int nb_data;
     uint8_t* data;
     uint8_t* data;
 public:
 public:
     SrsMp4MediaDataBox();
     SrsMp4MediaDataBox();
     virtual ~SrsMp4MediaDataBox();
     virtual ~SrsMp4MediaDataBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -114,9 +174,16 @@ public:
  */
  */
 class SrsMp4FreeSpaceBox : public SrsMp4Box
 class SrsMp4FreeSpaceBox : public SrsMp4Box
 {
 {
+private:
+    int nb_data;
+    uint8_t* data;
 public:
 public:
     SrsMp4FreeSpaceBox();
     SrsMp4FreeSpaceBox();
     virtual ~SrsMp4FreeSpaceBox();
     virtual ~SrsMp4FreeSpaceBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -172,6 +239,10 @@ public:
 public:
 public:
     SrsMp4MovieHeaderBox();
     SrsMp4MovieHeaderBox();
     virtual ~SrsMp4MovieHeaderBox();
     virtual ~SrsMp4MovieHeaderBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -201,10 +272,6 @@ public:
     // an integer that declares the most recent time the presentation was modified (in
     // an integer that declares the most recent time the presentation was modified (in
     // seconds since midnight, Jan. 1, 1904, in UTC time)
     // seconds since midnight, Jan. 1, 1904, in UTC time)
     uint64_t modification_time;
     uint64_t modification_time;
-    // an integer that specifies the time-scale for the entire presentation; this is the number of
-    // time units that pass in one second. For example, a time coordinate system that measures time in
-    // sixtieths of a second has a time scale of 60.
-    uint32_t timescale;
     // an integer that uniquely identifies this track over the entire life-time of this presentation.
     // an integer that uniquely identifies this track over the entire life-time of this presentation.
     // Track IDs are never re-used and cannot be zero.
     // Track IDs are never re-used and cannot be zero.
     uint32_t track_ID;
     uint32_t track_ID;
@@ -244,6 +311,10 @@ public:
 public:
 public:
     SrsMp4TrackHeaderBox();
     SrsMp4TrackHeaderBox();
     virtual ~SrsMp4TrackHeaderBox();
     virtual ~SrsMp4TrackHeaderBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -282,6 +353,10 @@ public:
     int16_t media_rate_fraction;
     int16_t media_rate_fraction;
 public:
 public:
     SrsMp4ElstEntry();
     SrsMp4ElstEntry();
+public:
+    virtual int nb_header(uint32_t version);
+    virtual int encode_header(SrsBuffer* buf, uint32_t version);
+    virtual int decode_header(SrsBuffer* buf, uint32_t version);
 };
 };
 
 
 /**
 /**
@@ -300,6 +375,10 @@ public:
 public:
 public:
     SrsMp4EditListBox();
     SrsMp4EditListBox();
     virtual ~SrsMp4EditListBox();
     virtual ~SrsMp4EditListBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -338,16 +417,29 @@ public:
     // is derived from the presentation’s tracks: the value of this field corresponds to the duration of the
     // is derived from the presentation’s tracks: the value of this field corresponds to the duration of the
     // longest track in the presentation. If the duration cannot be determined then duration is set to all 1s.
     // longest track in the presentation. If the duration cannot be determined then duration is set to all 1s.
     uint64_t duration;
     uint64_t duration;
-public:
-    uint8_t pad:1;
+private:
     // the language code for this media. See ISO 639-2/T for the set of three character
     // the language code for this media. See ISO 639-2/T for the set of three character
     // codes. Each character is packed as the difference between its ASCII value and 0x60. Since the code
     // codes. Each character is packed as the difference between its ASCII value and 0x60. Since the code
     // is confined to being three lower-case letters, these values are strictly positive.
     // is confined to being three lower-case letters, these values are strictly positive.
-    uint16_t language:15;
+    uint16_t language;
     uint16_t pre_defined;
     uint16_t pre_defined;
 public:
 public:
     SrsMp4MediaHeaderBox();
     SrsMp4MediaHeaderBox();
     virtual ~SrsMp4MediaHeaderBox();
     virtual ~SrsMp4MediaHeaderBox();
+public:
+    // the language code for this media. See ISO 639-2/T for the set of three character
+    // codes. Each character is packed as the difference between its ASCII value and 0x60. Since the code
+    // is confined to being three lower-case letters, these values are strictly positive.
+    virtual uint8_t language0();
+    virtual void set_language0(uint8_t v);
+    virtual uint8_t language1();
+    virtual void set_language1(uint8_t v);
+    virtual uint8_t language2();
+    virtual void set_language2(uint8_t v);
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -371,6 +463,10 @@ public:
 public:
 public:
     SrsMp4HandlerReferenceBox();
     SrsMp4HandlerReferenceBox();
     virtual ~SrsMp4HandlerReferenceBox();
     virtual ~SrsMp4HandlerReferenceBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -403,6 +499,10 @@ public:
 public:
 public:
     SrsMp4VideoMeidaHeaderBox();
     SrsMp4VideoMeidaHeaderBox();
     virtual ~SrsMp4VideoMeidaHeaderBox();
     virtual ~SrsMp4VideoMeidaHeaderBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -421,6 +521,10 @@ public:
 public:
 public:
     SrsMp4SoundMeidaHeaderBox();
     SrsMp4SoundMeidaHeaderBox();
     virtual ~SrsMp4SoundMeidaHeaderBox();
     virtual ~SrsMp4SoundMeidaHeaderBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -445,6 +549,11 @@ public:
     std::string location;
     std::string location;
 public:
 public:
     SrsMp4DataEntryBox();
     SrsMp4DataEntryBox();
+    virtual ~SrsMp4DataEntryBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -455,6 +564,7 @@ class SrsMp4DataEntryUrlBox : public SrsMp4DataEntryBox
 {
 {
 public:
 public:
     SrsMp4DataEntryUrlBox();
     SrsMp4DataEntryUrlBox();
+    virtual ~SrsMp4DataEntryUrlBox();
 };
 };
 
 
 /**
 /**
@@ -467,6 +577,11 @@ public:
     std::string name;
     std::string name;
 public:
 public:
     SrsMp4DataEntryUrnBox();
     SrsMp4DataEntryUrnBox();
+    virtual ~SrsMp4DataEntryUrnBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -478,13 +593,18 @@ public:
  */
  */
 class SrsMp4DataReferenceBox : public SrsMp4FullBox
 class SrsMp4DataReferenceBox : public SrsMp4FullBox
 {
 {
-public:
-    // an integer that counts the actual entries
-    uint32_t entry_count;
-    SrsMp4DataEntryBox* entries;
+private:
+    std::vector<SrsMp4DataEntryBox*> entries;
 public:
 public:
     SrsMp4DataReferenceBox();
     SrsMp4DataReferenceBox();
     virtual ~SrsMp4DataReferenceBox();
     virtual ~SrsMp4DataReferenceBox();
+public:
+    virtual uint32_t entry_count();
+    virtual SrsMp4DataEntryBox* entry_at(int index);
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -516,6 +636,10 @@ public:
 public:
 public:
     SrsMp4SampleEntry();
     SrsMp4SampleEntry();
     virtual ~SrsMp4SampleEntry();
     virtual ~SrsMp4SampleEntry();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -549,6 +673,10 @@ public:
 public:
 public:
     SrsMp4VisualSampleEntry();
     SrsMp4VisualSampleEntry();
     virtual ~SrsMp4VisualSampleEntry();
     virtual ~SrsMp4VisualSampleEntry();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -558,7 +686,7 @@ public:
 class SrsMp4AudioSampleEntry : public SrsMp4SampleEntry
 class SrsMp4AudioSampleEntry : public SrsMp4SampleEntry
 {
 {
 public:
 public:
-    uint32_t reserved0[2];
+    uint64_t reserved0;
     uint16_t channelcount;
     uint16_t channelcount;
     uint16_t samplesize;
     uint16_t samplesize;
     uint16_t pre_defined0;
     uint16_t pre_defined0;
@@ -567,6 +695,10 @@ public:
 public:
 public:
     SrsMp4AudioSampleEntry();
     SrsMp4AudioSampleEntry();
     virtual ~SrsMp4AudioSampleEntry();
     virtual ~SrsMp4AudioSampleEntry();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -577,13 +709,18 @@ public:
  */
  */
 class SrsMp4SampleDescriptionBox : public SrsMp4FullBox
 class SrsMp4SampleDescriptionBox : public SrsMp4FullBox
 {
 {
-public:
-    // an integer that gives the number of entries in the following table
-    uint32_t entry_count;
-    SrsMp4SampleEntry* entries;
+private:
+    std::vector<SrsMp4SampleEntry*> entries;
 public:
 public:
     SrsMp4SampleDescriptionBox();
     SrsMp4SampleDescriptionBox();
     virtual ~SrsMp4SampleDescriptionBox();
     virtual ~SrsMp4SampleDescriptionBox();
+public:
+    virtual uint32_t entry_count();
+    virtual SrsMp4SampleEntry* entrie_at(int index);
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -618,6 +755,10 @@ public:
 public:
 public:
     SrsMp4DecodingTime2SampleBox();
     SrsMp4DecodingTime2SampleBox();
     virtual ~SrsMp4DecodingTime2SampleBox();
     virtual ~SrsMp4DecodingTime2SampleBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 
 
@@ -657,6 +798,10 @@ public:
 public:
 public:
     SrsMp4CompositionTime2SampleBox();
     SrsMp4CompositionTime2SampleBox();
     virtual ~SrsMp4CompositionTime2SampleBox();
     virtual ~SrsMp4CompositionTime2SampleBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -676,6 +821,10 @@ public:
 public:
 public:
     SrsMp4SyncSampleBox();
     SrsMp4SyncSampleBox();
     virtual ~SrsMp4SyncSampleBox();
     virtual ~SrsMp4SyncSampleBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -716,6 +865,10 @@ public:
 public:
 public:
     SrsMp4Sample2ChunkBox();
     SrsMp4Sample2ChunkBox();
     virtual ~SrsMp4Sample2ChunkBox();
     virtual ~SrsMp4Sample2ChunkBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -736,6 +889,10 @@ public:
 public:
 public:
     SrsMp4ChunkOffsetBox();
     SrsMp4ChunkOffsetBox();
     virtual ~SrsMp4ChunkOffsetBox();
     virtual ~SrsMp4ChunkOffsetBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -760,6 +917,10 @@ public:
 public:
 public:
     SrsMp4SampleSizeBox();
     SrsMp4SampleSizeBox();
     virtual ~SrsMp4SampleSizeBox();
     virtual ~SrsMp4SampleSizeBox();
+protected:
+    virtual int nb_header();
+    virtual int encode_header(SrsBuffer* buf);
+    virtual int decode_header(SrsBuffer* buf);
 };
 };
 
 
 /**
 /**
@@ -768,7 +929,13 @@ public:
 class SrsMp4Decoder
 class SrsMp4Decoder
 {
 {
 private:
 private:
+    // Underlayer reader.
     ISrsReader* reader;
     ISrsReader* reader;
+    // The stream used to demux the boxes.
+    // TODO: FIXME: refine for performance issue.
+    SrsSimpleStream* stream;
+    // Always load next box.
+    SrsMp4Box* next;
 public:
 public:
     SrsMp4Decoder();
     SrsMp4Decoder();
     virtual ~SrsMp4Decoder();
     virtual ~SrsMp4Decoder();
@@ -779,6 +946,8 @@ public:
      *      the decoder just read data from the reader.
      *      the decoder just read data from the reader.
      */
      */
     virtual int initialize(ISrsReader* r);
     virtual int initialize(ISrsReader* r);
+private:
+    virtual int load_next_box(SrsMp4Box** ppbox);
 };
 };
 
 
 #endif
 #endif