http streaming support flv start index.

@@ -44,7 +44,6 @@ g++ -o ts_info ts_info.cc -g -O0 -ansi
 
 #define trace(msg, ...) printf(msg"\n", ##__VA_ARGS__);
 #define srs_freep(p) delete p; p = NULL
-#define srs_freepa(p) delete[] p; p = NULL
 #define srs_assert(p) assert(p)
 #define srs_min(a, b) ((a)<(b)? (a):(b))
 

@@ -263,7 +263,7 @@ int SrsDvrPlan::flv_open(string stream, string path)
     segment->reset();
     
     std::string tmp_file = path + ".tmp";
-    if ((ret = fs->open(tmp_file)) != ERROR_SUCCESS) {
+    if ((ret = fs->open_write(tmp_file)) != ERROR_SUCCESS) {
         srs_error("open file stream for file %s failed. ret=%d", path.c_str(), ret);
         return ret;
     }
@@ -287,9 +287,7 @@ int SrsDvrPlan::flv_close()
 {
     int ret = ERROR_SUCCESS;
     
-    if ((ret = fs->close()) != ERROR_SUCCESS) {
-        return ret;
-    }
+    fs->close();
     
     std::string tmp_file = segment->path + ".tmp";
     if (rename(tmp_file.c_str(), segment->path.c_str()) < 0) {
@@ -552,7 +550,7 @@ int SrsDvrHssPlan::on_meta_data(SrsOnMetaDataPacket* metadata)
         << req->stream << ".header.flv";
         
     SrsFileStream fs;
-    if ((ret = fs.open(path.str().c_str())) != ERROR_SUCCESS) {
+    if ((ret = fs.open_write(path.str().c_str())) != ERROR_SUCCESS) {
         return ret;
     }
     

@@ -38,6 +38,9 @@ using namespace std;
 #include <srs_app_http_hooks.hpp>
 #include <srs_app_codec.hpp>
 
+#define SRS_FLV_TAG_HEADER_SIZE 11
+#define SRS_FLV_PREVIOUS_TAG_SIZE 4
+
 SrsFileStream::SrsFileStream()
 {
     fd = -1;
@@ -48,7 +51,7 @@ SrsFileStream::~SrsFileStream()
     close();
 }
 
-int SrsFileStream::open(string file)
+int SrsFileStream::open_write(string file)
 {
     int ret = ERROR_SUCCESS;
     
@@ -72,22 +75,43 @@ int SrsFileStream::open(string file)
     return ret;
 }
 
-int SrsFileStream::close()
+int SrsFileStream::open_read(string file)
 {
     int ret = ERROR_SUCCESS;
     
-    if (fd < 0) {
+    if (fd > 0) {
+        ret = ERROR_SYSTEM_FILE_ALREADY_OPENED;
+        srs_error("file %s already opened. ret=%d", _file.c_str(), ret);
+        return ret;
+    }
+
+    if ((fd = ::open(file.c_str(), O_RDONLY)) < 0) {
+        ret = ERROR_SYSTEM_FILE_OPENE;
+        srs_error("open file %s failed. ret=%d", file.c_str(), ret);
         return ret;
     }
     
+    _file = file;
+    
+    return ret;
+}
+
+void SrsFileStream::close()
+{
+    int ret = ERROR_SUCCESS;
+    
+    if (fd < 0) {
+        return;
+    }
+    
     if (::close(fd) < 0) {
         ret = ERROR_SYSTEM_FILE_CLOSE;
         srs_error("close file %s failed. ret=%d", _file.c_str(), ret);
-        return ret;
+        return;
     }
     fd = -1;
     
-    return ret;
+    return;
 }
 
 bool SrsFileStream::is_open()
@@ -141,6 +165,24 @@ int64_t SrsFileStream::tellg()
     return (int64_t)::lseek(fd, 0, SEEK_CUR);
 }
 
+int64_t SrsFileStream::lseek(int64_t offset)
+{
+    return (int64_t)::lseek(fd, offset, SEEK_SET);
+}
+
+int64_t SrsFileStream::filesize()
+{
+    int64_t cur = tellg();
+    int64_t size = (int64_t)::lseek(fd, 0, SEEK_END);
+    ::lseek(fd, cur, SEEK_SET);
+    return size;
+}
+
+void SrsFileStream::skip(int64_t size)
+{
+    ::lseek(fd, size, SEEK_CUR);
+}
+
 SrsFlvEncoder::SrsFlvEncoder()
 {
     _fs = NULL;
@@ -165,6 +207,7 @@ int SrsFlvEncoder::write_header()
 {
     int ret = ERROR_SUCCESS;
     
+    // 9bytes header and 4bytes first previous-tag-size
     static char flv_header[] = {
         'F', 'L', 'V', // Signatures "FLV"
         (char)0x01, // File version (for example, 0x01 for FLV version 1)
@@ -218,6 +261,7 @@ int SrsFlvEncoder::write_audio(int64_t timestamp, char* data, int size)
     
     timestamp &= 0x7fffffff;
     
+    // 11bytes tag header
     static char tag_header[] = {
         (char)8, // TagType UB [5], 8 = audio
         (char)0x00, (char)0x00, (char)0x00, // DataSize UI24 Length of the message.
@@ -249,6 +293,7 @@ int SrsFlvEncoder::write_video(int64_t timestamp, char* data, int size)
     
     timestamp &= 0x7fffffff;
     
+    // 11bytes tag header
     static char tag_header[] = {
         (char)9, // TagType UB [5], 9 = video
         (char)0x00, (char)0x00, (char)0x00, // DataSize UI24 Length of the message.
@@ -291,8 +336,8 @@ int SrsFlvEncoder::write_tag(char* header, int header_size, char* tag, int tag_s
     }
     
     // PreviousTagSizeN UI32 Size of last tag, including its header, in bytes.
-    static char pre_size[4];
-    if ((ret = tag_stream->initialize(pre_size, 4)) != ERROR_SUCCESS) {
+    static char pre_size[SRS_FLV_PREVIOUS_TAG_SIZE];
+    if ((ret = tag_stream->initialize(pre_size, SRS_FLV_PREVIOUS_TAG_SIZE)) != ERROR_SUCCESS) {
         return ret;
     }
     tag_stream->write_4bytes(tag_size + header_size);
@@ -304,3 +349,163 @@ int SrsFlvEncoder::write_tag(char* header, int header_size, char* tag, int tag_s
     return ret;
 }
 
+SrsFlvFastDecoder::SrsFlvFastDecoder()
+{
+    _fs = NULL;
+    tag_stream = new SrsStream();
+}
+
+SrsFlvFastDecoder::~SrsFlvFastDecoder()
+{
+    srs_freep(tag_stream);
+}
+
+int SrsFlvFastDecoder::initialize(SrsFileStream* fs)
+{
+    int ret = ERROR_SUCCESS;
+    
+    _fs = fs;
+    
+    return ret;
+}
+
+int SrsFlvFastDecoder::read_header(char** pdata, int* psize)
+{
+    *pdata = NULL;
+    *psize = 0;
+    
+    int ret = ERROR_SUCCESS;
+
+    srs_assert(_fs);
+    
+    // 9bytes header and 4bytes first previous-tag-size
+    int size = 13;
+    char* buf = new char[size];
+    
+    if ((ret = _fs->read(buf, size, NULL)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    *pdata = buf;
+    *psize = size;
+    
+    return ret;
+}
+
+int SrsFlvFastDecoder::read_sequence_header(int64_t* pstart, int* psize)
+{
+    *pstart = 0;
+    *psize = 0;
+    
+    int ret = ERROR_SUCCESS;
+
+    srs_assert(_fs);
+    
+    // simply, the first video/audio must be the sequence header.
+    // and must be a sequence video and audio.
+    
+    // 11bytes tag header
+    static char tag_header[] = {
+        (char)0x00, // TagType UB [5], 9 = video, 8 = audio, 18 = script data
+        (char)0x00, (char)0x00, (char)0x00, // DataSize UI24 Length of the message.
+        (char)0x00, (char)0x00, (char)0x00, // Timestamp UI24 Time in milliseconds at which the data in this tag applies.
+        (char)0x00, // TimestampExtended UI8
+        (char)0x00, (char)0x00, (char)0x00, // StreamID UI24 Always 0.
+    };
+    
+    // discovery the sequence header video and audio.
+    // @remark, maybe no video or no audio.
+    bool got_video = false;
+    bool got_audio = false;
+    // audio/video sequence and data offset.
+    int64_t av_sequence_offset_start = -1;
+    int64_t av_sequence_offset_end = -1;
+    for (;;) {
+        if ((ret = _fs->read(tag_header, SRS_FLV_TAG_HEADER_SIZE, NULL)) != ERROR_SUCCESS) {
+            return ret;
+        }
+        
+        if ((ret = tag_stream->initialize(tag_header, SRS_FLV_TAG_HEADER_SIZE)) != ERROR_SUCCESS) {
+            return ret;
+        }
+        
+        int8_t tag_type = tag_stream->read_1bytes();
+        int32_t data_size = tag_stream->read_3bytes();
+        
+        bool is_video = tag_type == 0x09;
+        bool is_audio = tag_type == 0x08;
+        bool is_not_av = !is_video && !is_audio;
+        if (is_not_av) {
+            // skip body and tag size.
+            _fs->skip(data_size + SRS_FLV_PREVIOUS_TAG_SIZE);
+            continue;
+        }
+        
+        // if video duplicated, no audio
+        if (is_video && got_video) {
+            break;
+        }
+        // if audio duplicated, no video
+        if (is_audio && got_audio) {
+            break;
+        }
+        
+        // video
+        if (is_video) {
+            srs_assert(!got_video);
+            got_video = true;
+            
+            if (av_sequence_offset_start < 0) {
+                av_sequence_offset_start = _fs->tellg() - SRS_FLV_TAG_HEADER_SIZE;
+            }
+            av_sequence_offset_end = _fs->tellg() + data_size + SRS_FLV_PREVIOUS_TAG_SIZE;
+            _fs->skip(data_size + SRS_FLV_PREVIOUS_TAG_SIZE);
+        }
+        
+        // audio
+        if (is_audio) {
+            srs_assert(!got_audio);
+            got_audio = true;
+            
+            if (av_sequence_offset_start < 0) {
+                av_sequence_offset_start = _fs->tellg() - SRS_FLV_TAG_HEADER_SIZE;
+            }
+            av_sequence_offset_end = _fs->tellg() + data_size + SRS_FLV_PREVIOUS_TAG_SIZE;
+            _fs->skip(data_size + SRS_FLV_PREVIOUS_TAG_SIZE);
+        }
+    }
+    
+    // seek to the sequence header start offset.
+    if (av_sequence_offset_start > 0) {
+        _fs->lseek(av_sequence_offset_start);
+        *pstart = av_sequence_offset_start;
+        *psize = (int)(av_sequence_offset_end - av_sequence_offset_start);
+    }
+    
+    return ret;
+}
+
+int SrsFlvFastDecoder::lseek(int64_t offset)
+{
+    int ret = ERROR_SUCCESS;
+
+    srs_assert(_fs);
+    
+    if (offset >= _fs->filesize()) {
+        ret = ERROR_SYSTEM_FILE_EOF;
+        srs_warn("flv fast decoder seek overflow file, "
+            "size=%"PRId64", offset=%"PRId64", ret=%d", 
+            _fs->filesize(), offset, ret);
+        return ret;
+    }
+    
+    if (_fs->lseek(offset) < 0) {
+        ret = ERROR_SYSTEM_FILE_SEEK;
+        srs_warn("flv fast decoder seek error, "
+            "size=%"PRId64", offset=%"PRId64", ret=%d", 
+            _fs->filesize(), offset, ret);
+        return ret;
+    }
+    
+    return ret;
+}

@@ -43,8 +43,9 @@ public:
     SrsFileStream();
     virtual ~SrsFileStream();
 public:
-    virtual int open(std::string file);
-    virtual int close();
+    virtual int open_write(std::string file);
+    virtual int open_read(std::string file);
+    virtual void close();
     virtual bool is_open();
 public:
     /**
@@ -59,6 +60,9 @@ public:
     * tell current offset of stream.
     */
     virtual int64_t tellg();
+    virtual int64_t lseek(int64_t offset);
+    virtual int64_t filesize();
+    virtual void skip(int64_t size);
 };
 
 /**
@@ -104,4 +108,38 @@ private:
     virtual int write_tag(char* header, int header_size, char* tag, int tag_size);
 };
 
+/**
+* decode flv fast by only decoding the header and tag.
+*/
+class SrsFlvFastDecoder
+{
+private:
+    SrsFileStream* _fs;
+private:
+    SrsStream* tag_stream;
+public:
+    SrsFlvFastDecoder();
+    virtual ~SrsFlvFastDecoder();
+public:
+    /**
+    * initialize the underlayer file stream,
+    * user can initialize multiple times to encode multiple flv files.
+    */
+    virtual int initialize(SrsFileStream* fs);
+public:
+    /**
+    * read the flv header and size.
+    */
+    virtual int read_header(char** pdata, int* psize);
+    /**
+    * read the sequence header and size.
+    */
+    virtual int read_sequence_header(int64_t* pstart, int* psize);
+public:
+    /**
+    * for start offset, seed to this position and response flv stream.
+    */
+    virtual int lseek(int64_t offset);
+};
+
 #endif
\ No newline at end of file

@@ -707,6 +707,28 @@ void SrsHttpMessage::append_body(const char* body, int length)
     _body->append(body, length);
 }
 
+string SrsHttpMessage::query_get(string key)
+{
+    std::string q = query();
+    size_t pos = std::string::npos;
+    
+    // must format as key=value&...&keyN=valueN
+    if ((pos = key.find("=")) != key.length() - 1) {
+        key = key + "=";
+    }
+    
+    if ((pos = q.find(key)) == std::string::npos) {
+        return "";
+    }
+    
+    std::string v = q.substr(pos + key.length());
+    if ((pos = v.find("&")) != std::string::npos) {
+        v = v.substr(0, pos);
+    }
+    
+    return v;
+}
+
 int SrsHttpMessage::request_header_count()
 {
     return (int)headers.size();

@@ -359,6 +359,13 @@ public:
     virtual void set_requires_crossdomain(bool requires_crossdomain);
     virtual void append_body(const char* body, int length);
 public:
+    /**
+    * get the param in query string,
+    * for instance, query is "start=100&end=200",
+    * then query_get("start") is "100", and query_get("end") is "200"
+    */
+    virtual std::string query_get(std::string key);
+public:
     virtual int request_header_count();
     virtual std::string request_header_key_at(int index);
     virtual std::string request_header_value_at(int index);

@@ -25,12 +25,13 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 #ifdef SRS_AUTO_HTTP_SERVER
 
-#include <sstream>
-using namespace std;
-
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <stdlib.h>
+
+#include <sstream>
+using namespace std;
 
 #include <srs_kernel_log.hpp>
 #include <srs_kernel_error.hpp>
@@ -39,6 +40,7 @@ using namespace std;
 #include <srs_core_autofree.hpp>
 #include <srs_app_json.hpp>
 #include <srs_app_config.hpp>
+#include <srs_app_flv.hpp>
 
 #define SRS_HTTP_DEFAULT_PAGE "index.html"
 
@@ -166,7 +168,17 @@ int SrsHttpVhost::do_process_request(SrsSocket* skt, SrsHttpMessage* req)
     if (srs_string_ends_with(fullpath, ".ts")) {
         return response_ts_file(skt, req, fullpath);
     } else if (srs_string_ends_with(fullpath, ".flv") || srs_string_ends_with(fullpath, ".fhv")) {
-        return response_flv_file(skt, req, fullpath);
+        std::string start = req->query_get("start");
+        if (start.empty()) {
+            return response_flv_file(skt, req, fullpath);
+        }
+
+        int offset = ::atoi(start.c_str());
+        if (offset <= 0) {
+            return response_flv_file(skt, req, fullpath);
+        }
+        
+        return response_flv_file2(skt, req, fullpath, offset);
     } else {
         return response_regular_file(skt, req, fullpath);
     }
@@ -283,6 +295,112 @@ int SrsHttpVhost::response_flv_file(SrsSocket* skt, SrsHttpMessage* req, string
     return ret;
 }
 
+int SrsHttpVhost::response_flv_file2(SrsSocket* skt, SrsHttpMessage* req, string fullpath, int offset)
+{
+    int ret = ERROR_SUCCESS;
+    
+    SrsFileStream fs;
+    
+    // open flv file
+    if ((ret = fs.open_read(fullpath)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if (offset > fs.filesize()) {
+        ret = ERROR_HTTP_FLV_OFFSET_OVERFLOW;
+        srs_warn("http flv streaming %s overflow. size=%"PRId64", offset=%d, ret=%d", 
+            fullpath.c_str(), fs.filesize(), offset, ret);
+        return ret;
+    }
+    
+    SrsFlvFastDecoder ffd;
+    
+    // open fast decoder
+    if ((ret = ffd.initialize(&fs)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    // save header, send later.
+    char* flv_header = NULL;
+    int flv_size = 0;
+    
+    // send flv header
+    if ((ret = ffd.read_header(&flv_header, &flv_size)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    SrsAutoFree(char, flv_header);
+    
+    // save sequence header, send later
+    char* sh_data = NULL;
+    int sh_size = 0;
+    
+    if (true) {
+        // send sequence header
+        int64_t start = 0;
+        if ((ret = ffd.read_sequence_header(&start, &sh_size)) != ERROR_SUCCESS) {
+            return ret;
+        }
+        if (sh_size <= 0) {
+            ret = ERROR_HTTP_FLV_SEQUENCE_HEADER;
+            srs_warn("http flv streaming no sequence header. size=%d, ret=%d", sh_size, ret);
+            return ret;
+        }
+    }
+    sh_data = new char[sh_size];
+    SrsAutoFree(char, sh_data);
+    if ((ret = fs.read(sh_data, sh_size, NULL)) != ERROR_SUCCESS) {
+        return ret;
+    }
+
+    // seek to data offset
+    int64_t left = fs.filesize() - offset;
+
+    // write http header for ts.
+    std::stringstream ss;
+
+    res_status_line(ss)->res_content_type_flv(ss)
+        ->res_content_length(ss, (int)(flv_size + sh_size + left));
+        
+    if (req->requires_crossdomain()) {
+        res_enable_crossdomain(ss);
+    }
+    
+    res_header_eof(ss);
+    
+    // flush http header to peer
+    if ((ret = res_flush(skt, ss)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    if (flv_size > 0 && (ret = skt->write(flv_header, flv_size, NULL)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    if (sh_size > 0 && (ret = skt->write(sh_data, sh_size, NULL)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    // write body.
+    char* buf = req->http_ts_send_buffer();
+    if ((ret = ffd.lseek(offset)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    // send data
+    while (left > 0) {
+        ssize_t nread = -1;
+        if ((ret = fs.read(buf, HTTP_TS_SEND_BUFFER_SIZE, &nread)) != ERROR_SUCCESS) {
+            return ret;
+        }
+        
+        left -= nread;
+        if ((ret = skt->write(buf, nread, NULL)) != ERROR_SUCCESS) {
+            return ret;
+        }
+    }
+    
+    return ret;
+}
+
 int SrsHttpVhost::response_ts_file(SrsSocket* skt, SrsHttpMessage* req, string fullpath)
 {
     int ret = ERROR_SUCCESS;

@@ -72,6 +72,7 @@ protected:
 private:
     virtual int response_regular_file(SrsSocket* skt, SrsHttpMessage* req, std::string fullpath);
     virtual int response_flv_file(SrsSocket* skt, SrsHttpMessage* req, std::string fullpath);
+    virtual int response_flv_file2(SrsSocket* skt, SrsHttpMessage* req, std::string fullpath, int offset);
     virtual int response_ts_file(SrsSocket* skt, SrsHttpMessage* req, std::string fullpath);
     virtual std::string get_request_file(SrsHttpMessage* req);
 public:

@@ -306,6 +306,7 @@ int SrsRtmpConn::stream_service_cycle()
         case SrsRtmpConnPlay: {
             srs_verbose("start to play stream %s.", req->stream.c_str());
             
+            // notice edge to start for the first client.
             if (vhost_is_edge) {
                 if ((ret = source->on_edge_start_play()) != ERROR_SUCCESS) {
                     srs_error("notice edge start play stream failed. ret=%d", ret);
@@ -313,6 +314,7 @@ int SrsRtmpConn::stream_service_cycle()
                 }
             }
             
+            // response connection start play
             if ((ret = rtmp->start_play(res->stream_id)) != ERROR_SUCCESS) {
                 srs_error("start to play stream failed. ret=%d", ret);
                 return ret;

@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR "0"
 #define VERSION_MINOR "9"
-#define VERSION_REVISION "114"
+#define VERSION_REVISION "113"
 #define RTMP_SIG_SRS_VERSION VERSION_MAJOR"."VERSION_MINOR"."VERSION_REVISION
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"

@@ -117,6 +117,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_SYSTEM_FILE_EOF               428
 #define ERROR_SYSTEM_FILE_RENAME            429
 #define ERROR_SYSTEM_CREATE_PIPE            430
+#define ERROR_SYSTEM_FILE_SEEK              431
 
 // see librtmp.
 // failed when open ssl create the dh
@@ -184,6 +185,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_HTTP_OPEN_FILE                805
 #define ERROR_HTTP_READ_FILE                806
 #define ERROR_HTTP_API_LOGS                 807
+#define ERROR_HTTP_FLV_SEQUENCE_HEADER      808
+#define ERROR_HTTP_FLV_OFFSET_OVERFLOW      809
 
 // system control message, 
 // not an error, but special control logic.