support ingest hls with m3u8 in m3u8.

@@ -254,6 +254,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ERROR_HTTP_RESPONSE_EOF             4025
 #define ERROR_HTTP_RESPONSE_EOF             4025
 #define ERROR_HTTP_INVALID_CHUNK_HEADER     4026
 #define ERROR_HTTP_INVALID_CHUNK_HEADER     4026
 #define ERROR_AVC_NALU_UEV                  4027
 #define ERROR_AVC_NALU_UEV                  4027
+#define ERROR_AAC_BYTES_INVALID             4028
 
 
 ///////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////
 // user-define error.
 // user-define error.

@@ -278,6 +278,11 @@ bool srs_string_starts_with(string str, string flag)
     return str.find(flag) == 0;
     return str.find(flag) == 0;
 }
 }
 
 
+bool srs_string_contains(string str, string flag)
+{
+    return str.find(flag) != string::npos;
+}
+
 int srs_do_create_dir_recursively(string dir)
 int srs_do_create_dir_recursively(string dir)
 {
 {
     int ret = ERROR_SUCCESS;
     int ret = ERROR_SUCCESS;
@@ -356,6 +361,22 @@ string srs_path_dirname(string path)
     return dirname;
     return dirname;
 }
 }
 
 
+string srs_path_basename(string path)
+{
+    std::string dirname = path;
+    size_t pos = string::npos;
+    
+    if ((pos = dirname.rfind("/")) != string::npos) {
+        // the basename("/") is "/"
+        if (dirname.length() == 1) {
+            return dirname;
+        }
+        dirname = dirname.substr(pos + 1);
+    }
+    
+    return dirname;
+}
+
 bool srs_avc_startswith_annexb(SrsStream* stream, int* pnb_start_code)
 bool srs_avc_startswith_annexb(SrsStream* stream, int* pnb_start_code)
 {
 {
     char* bytes = stream->data() + stream->pos();
     char* bytes = stream->data() + stream->pos();

@@ -67,6 +67,8 @@ extern std::string srs_string_remove(std::string str, std::string remove_chars);
 extern bool srs_string_ends_with(std::string str, std::string flag);
 extern bool srs_string_ends_with(std::string str, std::string flag);
 // whether string starts with
 // whether string starts with
 extern bool srs_string_starts_with(std::string str, std::string flag);
 extern bool srs_string_starts_with(std::string str, std::string flag);
+// whether string contains with
+extern bool srs_string_contains(std::string str, std::string flag);
 
 
 // create dir recursively
 // create dir recursively
 extern int srs_create_dir_recursively(std::string dir);
 extern int srs_create_dir_recursively(std::string dir);
@@ -75,6 +77,8 @@ extern int srs_create_dir_recursively(std::string dir);
 extern bool srs_path_exists(std::string path);
 extern bool srs_path_exists(std::string path);
 // get the dirname of path
 // get the dirname of path
 extern std::string srs_path_dirname(std::string path);
 extern std::string srs_path_dirname(std::string path);
+// get the basename of path
+extern std::string srs_path_basename(std::string path);
 
 
 /**
 /**
 * whether stream starts with the avc NALU in "AnnexB" 
 * whether stream starts with the avc NALU in "AnnexB" 

@@ -128,6 +128,16 @@ int main(int argc, char** argv)
     return proxy_hls2rtmp(in_hls_url, out_rtmp_url);
     return proxy_hls2rtmp(in_hls_url, out_rtmp_url);
 }
 }
 
 
+class ISrsAacHandler
+{
+public:
+    /**
+     * handle the aac frame, which in ADTS format(starts with FFFx).
+     * @param duration the duration in seconds of frames.
+*/
+virtual int on_aac_frame(char* frame, int frame_size, double duration) = 0;
+};
+
 // the context to ingest hls stream.
 // the context to ingest hls stream.
 class SrsIngestSrsInput
 class SrsIngestSrsInput
 {
 {
@@ -185,9 +195,18 @@ public:
     /**
     /**
      * parse the ts and use hanler to process the message.
      * parse the ts and use hanler to process the message.
      */
      */
-    virtual int parse(ISrsTsHandler* handler);
+    virtual int parse(ISrsTsHandler* ts, ISrsAacHandler* aac);
 private:
 private:
     /**
     /**
+     * parse the ts pieces body.
+     */
+    virtual int parseAac(ISrsAacHandler* handler, char* body, int nb_body, double duration);
+    virtual int parseTs(ISrsTsHandler* handler, char* body, int nb_body);
+    /**
+     * parse the m3u8 specified by url.
+     */
+    virtual int parseM3u8(SrsHttpUri* url, double& td, double& duration);
+    /**
      * find the ts piece by its url.
      * find the ts piece by its url.
      */
      */
     virtual SrsTsPiece* find_ts(string url);
     virtual SrsTsPiece* find_ts(string url);
@@ -215,17 +234,164 @@ int SrsIngestSrsInput::connect()
         st_usleep((next_connect_time - now) * 1000);
         st_usleep((next_connect_time - now) * 1000);
     }
     }
     
     
+    // set all ts to dirty.
+    dirty_all_ts();
+    
+    bool fresh_m3u8 = pieces.empty();
+    double td = 0.0;
+    double duration = 0.0;
+    if ((ret = parseM3u8(in_hls, td, duration)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    // fetch all ts.
+    fetch_all_ts(fresh_m3u8);
+    
+    // remove all dirty ts.
+    remove_dirty();
+    
+    srs_trace("fetch m3u8 ok, td=%.2f, duration=%.2f, pieces=%d", td, duration, pieces.size());
+    
+    return ret;
+}
+
+int SrsIngestSrsInput::parse(ISrsTsHandler* ts, ISrsAacHandler* aac)
+{
+    int ret = ERROR_SUCCESS;
+    
+    for (int i = 0; i < (int)pieces.size(); i++) {
+        SrsTsPiece* tp = pieces.at(i);
+        
+        // sent only once.
+        if (tp->sent) {
+            continue;
+        }
+        tp->sent = true;
+        
+        if (tp->body.empty()) {
+            continue;
+        }
+        
+        srs_trace("proxy the ts to rtmp, ts=%s, duration=%.2f", tp->url.c_str(), tp->duration);
+        
+        if (srs_string_ends_with(tp->url, ".ts")) {
+            if ((ret = parseTs(ts, (char*)tp->body.data(), (int)tp->body.length())) != ERROR_SUCCESS) {
+                return ret;
+            }
+        } else if (srs_string_ends_with(tp->url, ".aac")) {
+            if ((ret = parseAac(aac, (char*)tp->body.data(), (int)tp->body.length(), tp->duration)) != ERROR_SUCCESS) {
+                return ret;
+            }
+        } else {
+            srs_warn("ignore unkown piece %s", tp->url.c_str());
+        }
+    }
+    
+    return ret;
+}
+
+int SrsIngestSrsInput::parseTs(ISrsTsHandler* handler, char* body, int nb_body)
+{
+    int ret = ERROR_SUCCESS;
+    
+    // use stream to parse ts packet.
+    int nb_packet =  (int)nb_body / SRS_TS_PACKET_SIZE;
+    for (int i = 0; i < nb_packet; i++) {
+        char* p = (char*)body + (i * SRS_TS_PACKET_SIZE);
+        if ((ret = stream->initialize(p, SRS_TS_PACKET_SIZE)) != ERROR_SUCCESS) {
+            return ret;
+        }
+        
+        // process each ts packet
+        if ((ret = context->decode(stream, handler)) != ERROR_SUCCESS) {
+            // when peer closed, must interrupt parse and reconnect.
+            if (srs_is_client_gracefully_close(ret)) {
+                srs_warn("interrupt parse for peer closed. ret=%d", ret);
+                return ret;
+            }
+            
+            srs_warn("mpegts: ignore parse ts packet failed. ret=%d", ret);
+            continue;
+        }
+        srs_info("mpegts: parse ts packet completed");
+    }
+    srs_info("mpegts: parse udp packet completed");
+    
+    return ret;
+}
+
+int SrsIngestSrsInput::parseAac(ISrsAacHandler* handler, char* body, int nb_body, double duration)
+{
+    int ret = ERROR_SUCCESS;
+    
+    if ((ret = stream->initialize(body, nb_body)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    // atleast 2bytes.
+    if (!stream->require(3)) {
+        ret = ERROR_AAC_BYTES_INVALID;
+        srs_error("invalid aac, atleast 3bytes. ret=%d", ret);
+        return ret;
+    }
+    
+    u_int8_t id0 = (u_int8_t)body[0];
+    u_int8_t id1 = (u_int8_t)body[1];
+    u_int8_t id2 = (u_int8_t)body[2];
+    
+    // skip ID3.
+    if (id0 == 0x49 && id1 == 0x44 && id2 == 0x33) {
+        /*char id3[] = {
+            (char)0x49, (char)0x44, (char)0x33, // ID3
+            (char)0x03, (char)0x00, // version
+            (char)0x00, // flags
+            (char)0x00, (char)0x00, (char)0x00, (char)0x0a, // size
+            
+            (char)0x00, (char)0x00, (char)0x00, (char)0x00, // FrameID
+            (char)0x00, (char)0x00, (char)0x00, (char)0x00, // FrameSize
+            (char)0x00, (char)0x00 // Flags
+         };*/
+        // atleast 10 bytes.
+        if (!stream->require(10)) {
+            ret = ERROR_AAC_BYTES_INVALID;
+            srs_error("invalid aac ID3, atleast 10bytes. ret=%d", ret);
+            return ret;
+        }
+        
+        // ignore ID3 + version + flag.
+        stream->skip(6);
+        // read the size of ID3.
+        u_int32_t nb_id3 = stream->read_4bytes();
+        
+        // read body of ID3
+        if (!stream->require(nb_id3)) {
+            ret = ERROR_AAC_BYTES_INVALID;
+            srs_error("invalid aac ID3 body, required %dbytes. ret=%d", nb_id3, ret);
+            return ret;
+        }
+        stream->skip(nb_id3);
+    }
+    
+    char* frame = body + stream->pos();
+    int frame_size = nb_body - stream->pos();
+    return handler->on_aac_frame(frame, frame_size, duration);
+}
+
+int SrsIngestSrsInput::parseM3u8(SrsHttpUri* url, double& td, double& duration)
+{
+    int ret = ERROR_SUCCESS;
+    
     SrsHttpClient client;
     SrsHttpClient client;
-    srs_trace("parse input hls %s", in_hls->get_url());
+    srs_trace("parse input hls %s", url->get_url());
     
     
-    if ((ret = client.initialize(in_hls->get_host(), in_hls->get_port())) != ERROR_SUCCESS) {
+    if ((ret = client.initialize(url->get_host(), url->get_port())) != ERROR_SUCCESS) {
         srs_error("connect to server failed. ret=%d", ret);
         srs_error("connect to server failed. ret=%d", ret);
         return ret;
         return ret;
     }
     }
     
     
     SrsHttpMessage* msg = NULL;
     SrsHttpMessage* msg = NULL;
-    if ((ret = client.get(in_hls->get_path(), "", &msg)) != ERROR_SUCCESS) {
-        srs_error("HTTP GET %s failed. ret=%d", in_hls->get_url(), ret);
+    if ((ret = client.get(url->get_path(), "", &msg)) != ERROR_SUCCESS) {
+        srs_error("HTTP GET %s failed. ret=%d", url->get_url(), ret);
         return ret;
         return ret;
     }
     }
     
     
@@ -243,13 +409,7 @@ int SrsIngestSrsInput::connect()
         return ret;
         return ret;
     }
     }
     
     
-    // set all ts to dirty.
-    dirty_all_ts();
-    
     std::string ptl;
     std::string ptl;
-    double td = 0.0;
-    double duration = 0.0;
-    bool fresh_m3u8 = pieces.empty();
     while (!body.empty()) {
     while (!body.empty()) {
         size_t pos = string::npos;
         size_t pos = string::npos;
         
         
@@ -293,6 +453,28 @@ int SrsIngestSrsInput::connect()
             break;
             break;
         }
         }
         
         
+        // #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=73207,CODECS="mp4a.40.2"
+        if (srs_string_starts_with(line, "#EXT-X-STREAM-INF:")) {
+            if ((pos = body.find("\n")) == string::npos) {
+                srs_warn("m3u8 entry unexpected eof, inf=%s", line.c_str());
+                break;
+            }
+            
+            std::string m3u8_url = body.substr(0, pos);
+            body = body.substr(pos + 1);
+            
+            if (!srs_string_starts_with(m3u8_url, "http://")) {
+                m3u8_url = srs_path_dirname(url->get_url()) + "/" + m3u8_url;
+            }
+            srs_trace("parse sub m3u8, url=%s", m3u8_url.c_str());
+            
+            if ((ret = url->initialize(m3u8_url)) != ERROR_SUCCESS) {
+                return ret;
+            }
+            
+            return parseM3u8(url, td, duration);
+        }
+        
         // #EXTINF:11.401,
         // #EXTINF:11.401,
         // livestream-5.ts
         // livestream-5.ts
         // parse each ts entry, expect current line is inf.
         // parse each ts entry, expect current line is inf.
@@ -330,60 +512,6 @@ int SrsIngestSrsInput::connect()
         }
         }
     }
     }
     
     
-    // fetch all ts.
-    fetch_all_ts(fresh_m3u8);
-    
-    // remove all dirty ts.
-    remove_dirty();
-    
-    srs_trace("fetch m3u8 ok, td=%.2f, duration=%.2f, pieces=%d", td, duration, pieces.size());
-    
-    return ret;
-}
-
-int SrsIngestSrsInput::parse(ISrsTsHandler* handler)
-{
-    int ret = ERROR_SUCCESS;
-    
-    for (int i = 0; i < (int)pieces.size(); i++) {
-        SrsTsPiece* tp = pieces.at(i);
-        
-        // sent only once.
-        if (tp->sent) {
-            continue;
-        }
-        tp->sent = true;
-        
-        if (tp->body.empty()) {
-            continue;
-        }
-        
-        srs_trace("proxy the ts to rtmp, ts=%s, duration=%.2f", tp->url.c_str(), tp->duration);
-        
-        // use stream to parse ts packet.
-        int nb_packet =  (int)tp->body.length() / SRS_TS_PACKET_SIZE;
-        for (int i = 0; i < nb_packet; i++) {
-            char* p = (char*)tp->body.data() + (i * SRS_TS_PACKET_SIZE);
-            if ((ret = stream->initialize(p, SRS_TS_PACKET_SIZE)) != ERROR_SUCCESS) {
-                return ret;
-            }
-            
-            // process each ts packet
-            if ((ret = context->decode(stream, handler)) != ERROR_SUCCESS) {
-                // when peer closed, must interrupt parse and reconnect.
-                if (srs_is_client_gracefully_close(ret)) {
-                    srs_warn("interrupt parse for peer closed. ret=%d", ret);
-                    return ret;
-                }
-                
-                srs_warn("mpegts: ignore parse ts packet failed. ret=%d", ret);
-                continue;
-            }
-            srs_info("mpegts: parse ts packet completed");
-        }
-        srs_info("mpegts: parse udp packet completed");
-    }
-    
     return ret;
     return ret;
 }
 }
 
 
@@ -464,17 +592,11 @@ int SrsIngestSrsInput::SrsTsPiece::fetch(string m3u8)
         return ret;
         return ret;
     }
     }
     
     
-    size_t pos = string::npos;
-    
     SrsHttpClient client;
     SrsHttpClient client;
     
     
     std::string ts_url = url;
     std::string ts_url = url;
     if (!srs_string_starts_with(ts_url, "http://")) {
     if (!srs_string_starts_with(ts_url, "http://")) {
-        std::string baseurl = m3u8;
-        if ((pos = m3u8.rfind("/")) != string::npos) {
-            baseurl = m3u8.substr(0, pos);
-        }
-        ts_url = baseurl + "/" + url;
+        ts_url = srs_path_dirname(m3u8) + "/" + url;
     }
     }
     
     
     SrsHttpUri uri;
     SrsHttpUri uri;
@@ -507,13 +629,14 @@ int SrsIngestSrsInput::SrsTsPiece::fetch(string m3u8)
 }
 }
 
 
 // the context to output to rtmp server
 // the context to output to rtmp server
-class SrsIngestSrsOutput : public ISrsTsHandler
+class SrsIngestSrsOutput : virtual public ISrsTsHandler, virtual public ISrsAacHandler
 {
 {
 private:
 private:
     SrsHttpUri* out_rtmp;
     SrsHttpUri* out_rtmp;
 private:
 private:
     bool disconnected;
     bool disconnected;
     std::multimap<int64_t, SrsTsMessage*> queue;
     std::multimap<int64_t, SrsTsMessage*> queue;
+    int64_t raw_aac_dts;
 private:
 private:
     SrsRequest* req;
     SrsRequest* req;
     st_netfd_t stfd;
     st_netfd_t stfd;
@@ -534,6 +657,7 @@ public:
     SrsIngestSrsOutput(SrsHttpUri* rtmp) {
     SrsIngestSrsOutput(SrsHttpUri* rtmp) {
         out_rtmp = rtmp;
         out_rtmp = rtmp;
         disconnected = false;
         disconnected = false;
+        raw_aac_dts = 0;
         
         
         req = NULL;
         req = NULL;
         io = NULL;
         io = NULL;
@@ -563,7 +687,11 @@ public:
 // interface ISrsTsHandler
 // interface ISrsTsHandler
 public:
 public:
     virtual int on_ts_message(SrsTsMessage* msg);
     virtual int on_ts_message(SrsTsMessage* msg);
+// interface IAacHandler
+public:
+    virtual int on_aac_frame(char* frame, int frame_size, double duration);
 private:
 private:
+    virtual int do_on_aac_frame(SrsStream* avs, double duration);
     virtual int parse_message_queue();
     virtual int parse_message_queue();
     virtual int on_ts_video(SrsTsMessage* msg, SrsStream* avs);
     virtual int on_ts_video(SrsTsMessage* msg, SrsStream* avs);
     virtual int write_h264_sps_pps(u_int32_t dts, u_int32_t pts);
     virtual int write_h264_sps_pps(u_int32_t dts, u_int32_t pts);
@@ -661,6 +789,76 @@ int SrsIngestSrsOutput::on_ts_message(SrsTsMessage* msg)
     return ret;
     return ret;
 }
 }
 
 
+int SrsIngestSrsOutput::on_aac_frame(char* frame, int frame_size, double duration)
+{
+    int ret = ERROR_SUCCESS;
+    
+    srs_trace("handle aac frames, size=%dB, duration=%.2f, dts=%"PRId64, frame_size, duration, raw_aac_dts);
+    
+    SrsStream stream;
+    if ((ret = stream.initialize(frame, frame_size)) != ERROR_SUCCESS) {
+        return ret;
+    }
+    
+    return do_on_aac_frame(&stream, duration);
+}
+
+int SrsIngestSrsOutput::do_on_aac_frame(SrsStream* avs, double duration)
+{
+    int ret = ERROR_SUCCESS;
+    
+    // ts tbn to flv tbn.
+    u_int32_t dts = (u_int32_t)raw_aac_dts;
+    raw_aac_dts += (int64_t)(duration * 1000);
+    
+    // got the next msg to calc the delta duration for each audio.
+    u_int32_t max_dts = dts + (u_int32_t)(duration * 1000);
+    
+    // send each frame.
+    while (!avs->empty()) {
+        char* frame = NULL;
+        int frame_size = 0;
+        SrsRawAacStreamCodec codec;
+        if ((ret = aac->adts_demux(avs, &frame, &frame_size, codec)) != ERROR_SUCCESS) {
+            return ret;
+        }
+        
+        // ignore invalid frame,
+        //  * atleast 1bytes for aac to decode the data.
+        if (frame_size <= 0) {
+            continue;
+        }
+        srs_info("mpegts: demux aac frame size=%d, dts=%d", frame_size, dts);
+        
+        // generate sh.
+        if (aac_specific_config.empty()) {
+            std::string sh;
+            if ((ret = aac->mux_sequence_header(&codec, sh)) != ERROR_SUCCESS) {
+                return ret;
+            }
+            aac_specific_config = sh;
+            
+            codec.aac_packet_type = 0;
+            
+            if ((ret = write_audio_raw_frame((char*)sh.data(), (int)sh.length(), &codec, dts)) != ERROR_SUCCESS) {
+                return ret;
+            }
+        }
+        
+        // audio raw data.
+        codec.aac_packet_type = 1;
+        if ((ret = write_audio_raw_frame(frame, frame_size, &codec, dts)) != ERROR_SUCCESS) {
+            return ret;
+        }
+        
+        // calc the delta of dts, when previous frame output.
+        u_int32_t delta = (duration * 1000) / (avs->size() / frame_size);
+        dts = (u_int32_t)(srs_min(max_dts, dts + delta));
+    }
+    
+    return ret;
+}
+
 int SrsIngestSrsOutput::parse_message_queue()
 int SrsIngestSrsOutput::parse_message_queue()
 {
 {
     int ret = ERROR_SUCCESS;
     int ret = ERROR_SUCCESS;
@@ -914,7 +1112,7 @@ int SrsIngestSrsOutput::on_ts_audio(SrsTsMessage* msg, SrsStream* avs)
     // ts tbn to flv tbn.
     // ts tbn to flv tbn.
     u_int32_t dts = (u_int32_t)(msg->dts / 90);
     u_int32_t dts = (u_int32_t)(msg->dts / 90);
     
     
-    // got the next video to calc the delta duration for each audio.
+    // got the next msg to calc the delta duration for each audio.
     u_int32_t duration = 0;
     u_int32_t duration = 0;
     if (!queue.empty()) {
     if (!queue.empty()) {
         SrsTsMessage* nm = queue.begin()->second;
         SrsTsMessage* nm = queue.begin()->second;
@@ -992,6 +1190,8 @@ int SrsIngestSrsOutput::rtmp_write_packet(char type, u_int32_t timestamp, char*
     }
     }
     srs_assert(msg);
     srs_assert(msg);
     
     
+    srs_info("RTMP type=%d, dts=%d, size=%d", type, timestamp, size);
+    
     // send out encoded msg.
     // send out encoded msg.
     if ((ret = client->send_and_free_message(msg, stream_id)) != ERROR_SUCCESS) {
     if ((ret = client->send_and_free_message(msg, stream_id)) != ERROR_SUCCESS) {
         return ret;
         return ret;
@@ -1016,13 +1216,12 @@ int SrsIngestSrsOutput::connect()
     if (!req) {
     if (!req) {
         req = new SrsRequest();
         req = new SrsRequest();
         
         
-        size_t pos = string::npos;
         string uri = req->tcUrl = out_rtmp->get_url();
         string uri = req->tcUrl = out_rtmp->get_url();
         
         
         // tcUrl, stream
         // tcUrl, stream
-        if ((pos = uri.rfind("/")) != string::npos) {
-            req->stream = uri.substr(pos + 1);
-            req->tcUrl = uri = uri.substr(0, pos);
+        if (srs_string_contains(uri, "/")) {
+            req->stream = srs_path_basename(uri);
+            req->tcUrl = uri = srs_path_dirname(uri);
         }
         }
         
         
         srs_discovery_tc_url(req->tcUrl,
         srs_discovery_tc_url(req->tcUrl,
@@ -1155,7 +1354,7 @@ public:
             return ret;
             return ret;
         }
         }
         
         
-        if ((ret = ic->parse(oc)) != ERROR_SUCCESS) {
+        if ((ret = ic->parse(oc, oc)) != ERROR_SUCCESS) {
             srs_warn("proxy ts to rtmp failed. ret=%d", ret);
             srs_warn("proxy ts to rtmp failed. ret=%d", ret);
             return ret;
             return ret;
         }
         }

@@ -362,9 +362,12 @@ int SrsRawAacStream::adts_demux(SrsStream* stream, char** pframe, int* pnb_frame
         * and set to ‘0’ if the audio data are MPEG-4. See also ISO/IEC 11172-3, subclause 2.4.2.3.
         * and set to ‘0’ if the audio data are MPEG-4. See also ISO/IEC 11172-3, subclause 2.4.2.3.
         */
         */
         if (id != 0x01) {
         if (id != 0x01) {
-            ret = ERROR_ADTS_ID_NOT_AAC;
-            srs_warn("adts: id must be 1(aac), actual 0(mp4a). ret=%d", ret);
-            return ret;
+            srs_info("adts: id must be 1(aac), actual 0(mp4a). ret=%d", ret);
+            
+            // well, some system always use 0, but actually is aac format.
+            // for example, houjian vod ts always set the aac id to 0, actually 1.
+            // we just ignore it, and alwyas use 1(aac) to demux.
+            id = 0x01;
         }
         }
         
         
         int16_t sfiv = stream->read_2bytes();
         int16_t sfiv = stream->read_2bytes();