Merge branch 'srs.master'

@@ -35,7 +35,7 @@ int main(int argc, char** argv)
     srs_rtmp_t rtmp;
     srs_rtmp_t rtmp;
     
     
     // time
     // time
-    int64_t time_startup = srs_utils_get_time_ms();
+    int64_t time_startup = srs_utils_time_ms();
     int64_t time_dns_resolve = 0;
     int64_t time_dns_resolve = 0;
     int64_t time_socket_connect = 0;
     int64_t time_socket_connect = 0;
     int64_t time_play_stream = 0;
     int64_t time_play_stream = 0;
@@ -95,14 +95,14 @@ int main(int argc, char** argv)
         goto rtmp_destroy;
         goto rtmp_destroy;
     }
     }
     srs_human_trace("dns resolve success");
     srs_human_trace("dns resolve success");
-    time_dns_resolve = srs_utils_get_time_ms();
+    time_dns_resolve = srs_utils_time_ms();
     
     
     if ((ret = __srs_rtmp_connect_server(rtmp)) != 0) {
     if ((ret = __srs_rtmp_connect_server(rtmp)) != 0) {
         srs_human_trace("socket connect failed. ret=%d", ret);
         srs_human_trace("socket connect failed. ret=%d", ret);
         goto rtmp_destroy;
         goto rtmp_destroy;
     }
     }
     srs_human_trace("socket connect success");
     srs_human_trace("socket connect success");
-    time_socket_connect = srs_utils_get_time_ms();
+    time_socket_connect = srs_utils_time_ms();
     
     
     if ((ret = __srs_rtmp_do_simple_handshake(rtmp)) != 0) {
     if ((ret = __srs_rtmp_do_simple_handshake(rtmp)) != 0) {
         srs_human_trace("do simple handshake failed. ret=%d", ret);
         srs_human_trace("do simple handshake failed. ret=%d", ret);
@@ -121,7 +121,7 @@ int main(int argc, char** argv)
         goto rtmp_destroy;
         goto rtmp_destroy;
     }
     }
     srs_human_trace("play stream success");
     srs_human_trace("play stream success");
-    time_play_stream = srs_utils_get_time_ms();
+    time_play_stream = srs_utils_time_ms();
     
     
     for (;;) {
     for (;;) {
         if ((ret = srs_rtmp_read_packet(rtmp, &type, &timestamp, &data, &size)) != 0) {
         if ((ret = srs_rtmp_read_packet(rtmp, &type, &timestamp, &data, &size)) != 0) {
@@ -133,7 +133,7 @@ int main(int argc, char** argv)
         
         
         if (SRS_RTMP_TYPE_VIDEO == type || SRS_RTMP_TYPE_AUDIO == type) {
         if (SRS_RTMP_TYPE_VIDEO == type || SRS_RTMP_TYPE_AUDIO == type) {
             if (time_first_packet <= 0) {
             if (time_first_packet <= 0) {
-                time_first_packet = srs_utils_get_time_ms();
+                time_first_packet = srs_utils_time_ms();
             }
             }
             if (basetime <= 0) {
             if (basetime <= 0) {
                 basetime = timestamp;
                 basetime = timestamp;
@@ -142,7 +142,7 @@ int main(int argc, char** argv)
         
         
         free(data);
         free(data);
         
         
-        if (srs_utils_get_time_ms() - time_startup > timeout * 1000) {
+        if (srs_utils_time_ms() - time_startup > timeout * 1000) {
             srs_human_trace("timeout, terminate.");
             srs_human_trace("timeout, terminate.");
             goto rtmp_destroy;
             goto rtmp_destroy;
         }
         }
@@ -154,11 +154,11 @@ int main(int argc, char** argv)
     }
     }
     
     
 rtmp_destroy:
 rtmp_destroy:
-    bytes_nsend = srs_utils_get_send_bytes(rtmp);
-    bytes_nrecv = srs_utils_get_recv_bytes(rtmp);
+    bytes_nsend = srs_utils_send_bytes(rtmp);
+    bytes_nrecv = srs_utils_recv_bytes(rtmp);
     
     
     srs_rtmp_destroy(rtmp);
     srs_rtmp_destroy(rtmp);
-    time_cleanup = srs_utils_get_time_ms();
+    time_cleanup = srs_utils_time_ms();
     time_duration = (int)(time_cleanup - time_startup);
     time_duration = (int)(time_cleanup - time_startup);
     
     
     // print result to stderr.
     // print result to stderr.

@@ -48,7 +48,7 @@ int main(int argc, char** argv)
     int ret = 0;
     int ret = 0;
     
     
     // main function
     // main function
-    tools_main_entrance_startup_time = srs_utils_get_time_ms();
+    tools_main_entrance_startup_time = srs_utils_time_ms();
     
     
     // user option parse index.
     // user option parse index.
     int opt = 0;
     int opt = 0;
@@ -215,7 +215,7 @@ int connect_oc(srs_rtmp_t ortmp)
 int64_t re_create()
 int64_t re_create()
 {
 {
     // if not very precise, we can directly use this as re.
     // if not very precise, we can directly use this as re.
-    int64_t re = srs_utils_get_time_ms();
+    int64_t re = srs_utils_time_ms();
     
     
     // use the starttime to get the deviation
     // use the starttime to get the deviation
     int64_t deviation = re - tools_main_entrance_startup_time;
     int64_t deviation = re - tools_main_entrance_startup_time;
@@ -236,7 +236,7 @@ int64_t re_create()
 void re_update(int64_t re, int32_t starttime, u_int32_t time)
 void re_update(int64_t re, int32_t starttime, u_int32_t time)
 {
 {
     // send by pulse algorithm.
     // send by pulse algorithm.
-    int64_t now = srs_utils_get_time_ms();
+    int64_t now = srs_utils_time_ms();
     int64_t diff = time - starttime - (now -re);
     int64_t diff = time - starttime - (now -re);
     if (diff > RE_PULSE_MS) {
     if (diff > RE_PULSE_MS) {
         usleep(diff * 1000);
         usleep(diff * 1000);
@@ -246,7 +246,7 @@ void re_cleanup(int64_t re, int32_t starttime, u_int32_t time)
 {
 {
     // for the last pulse, always sleep.
     // for the last pulse, always sleep.
     // for the virtual live encoder long time publishing.
     // for the virtual live encoder long time publishing.
-    int64_t now = srs_utils_get_time_ms();
+    int64_t now = srs_utils_time_ms();
     int64_t diff = time - starttime - (now -re);
     int64_t diff = time - starttime - (now -re);
     if (diff > 0) {
     if (diff > 0) {
         srs_human_trace("re_cleanup, diff=%d, start=%d, last=%d ms", 
         srs_human_trace("re_cleanup, diff=%d, start=%d, last=%d ms", 

@@ -1712,20 +1712,20 @@ void srs_amf0_strict_array_append(srs_amf0_t amf0, srs_amf0_t value)
     obj->append(any);
     obj->append(any);
 }
 }
 
 
-int64_t srs_utils_get_time_ms()
+int64_t srs_utils_time_ms()
 {
 {
     srs_update_system_time_ms();
     srs_update_system_time_ms();
     return srs_get_system_time_ms();
     return srs_get_system_time_ms();
 }
 }
 
 
-int64_t srs_utils_get_send_bytes(srs_rtmp_t rtmp)
+int64_t srs_utils_send_bytes(srs_rtmp_t rtmp)
 {
 {
     srs_assert(rtmp != NULL);
     srs_assert(rtmp != NULL);
     Context* context = (Context*)rtmp;
     Context* context = (Context*)rtmp;
     return context->rtmp->get_send_bytes();
     return context->rtmp->get_send_bytes();
 }
 }
 
 
-int64_t srs_utils_get_recv_bytes(srs_rtmp_t rtmp)
+int64_t srs_utils_recv_bytes(srs_rtmp_t rtmp)
 {
 {
     srs_assert(rtmp != NULL);
     srs_assert(rtmp != NULL);
     Context* context = (Context*)rtmp;
     Context* context = (Context*)rtmp;
@@ -1773,7 +1773,7 @@ int srs_utils_parse_timestamp(
     return ret;
     return ret;
 }
 }
 
 
-char srs_utils_get_flv_video_codec_id(char* data, int size)
+char srs_utils_flv_video_codec_id(char* data, int size)
 {
 {
     if (size < 1) {
     if (size < 1) {
         return 0;
         return 0;
@@ -1785,7 +1785,7 @@ char srs_utils_get_flv_video_codec_id(char* data, int size)
     return codec_id;
     return codec_id;
 }
 }
 
 
-char srs_utils_get_flv_video_avc_packet_type(char* data, int size)
+char srs_utils_flv_video_avc_packet_type(char* data, int size)
 {
 {
     if (size < 2) {
     if (size < 2) {
         return -1;
         return -1;
@@ -1804,7 +1804,7 @@ char srs_utils_get_flv_video_avc_packet_type(char* data, int size)
     return avc_packet_type;
     return avc_packet_type;
 }
 }
 
 
-char srs_utils_get_flv_video_frame_type(char* data, int size)
+char srs_utils_flv_video_frame_type(char* data, int size)
 {
 {
     if (size < 1) {
     if (size < 1) {
         return -1;
         return -1;
@@ -1823,6 +1823,85 @@ char srs_utils_get_flv_video_frame_type(char* data, int size)
     return frame_type;
     return frame_type;
 }
 }
 
 
+char srs_utils_flv_audio_sound_format(char* data, int size)
+{
+    if (size < 1) {
+        return -1;
+    }
+    
+    u_int8_t sound_format = data[0];
+    sound_format = (sound_format >> 4) & 0x0f;
+    if (sound_format > 15 || sound_format == 12 || sound_format == 13) {
+        return -1;
+    }
+    
+    return sound_format;
+}
+
+char srs_utils_flv_audio_sound_rate(char* data, int size)
+{
+    if (size < 1) {
+        return -1;
+    }
+    
+    u_int8_t sound_rate = data[0];
+    sound_rate = (sound_rate >> 2) & 0x03;
+    if (sound_rate > 3) {
+        return -1;
+    }
+    
+    return sound_rate;
+}
+
+char srs_utils_flv_audio_sound_size(char* data, int size)
+{
+    if (size < 1) {
+        return -1;
+    }
+    
+    u_int8_t sound_size = data[0];
+    sound_size = (sound_size >> 1) & 0x01;
+    if (sound_size > 1) {
+        return -1;
+    }
+    
+    return sound_size;
+}
+
+char srs_utils_flv_audio_sound_type(char* data, int size)
+{
+    if (size < 1) {
+        return -1;
+    }
+    
+    u_int8_t sound_type = data[0];
+    sound_type = sound_type & 0x01;
+    if (sound_type > 1) {
+        return -1;
+    }
+    
+    return sound_type;
+}
+
+char srs_utils_flv_audio_aac_packet_type(char* data, int size)
+{
+    if (size < 2) {
+        return -1;
+    }
+    
+    if (srs_utils_flv_audio_sound_format(data, size) != 10) {
+        return -1;
+    }
+    
+    u_int8_t aac_packet_type = data[1];
+    aac_packet_type = aac_packet_type;
+    if (aac_packet_type > 1) {
+        return -1;
+    }
+    
+    return aac_packet_type;
+}
+
 char* srs_human_amf0_print(srs_amf0_t amf0, char** pdata, int* psize)
 char* srs_human_amf0_print(srs_amf0_t amf0, char** pdata, int* psize)
 {
 {
     if (!amf0) {
     if (!amf0) {
@@ -1876,7 +1955,7 @@ const char* srs_human_flv_video_codec_id2string(char codec_id)
 
 
 const char* srs_human_flv_video_avc_packet_type2string(char avc_packet_type)
 const char* srs_human_flv_video_avc_packet_type2string(char avc_packet_type)
 {
 {
-    static const char* sps_pps = "SpsPps";
+    static const char* sps_pps = "SH";
     static const char* nalu = "Nalu";
     static const char* nalu = "Nalu";
     static const char* sps_pps_end = "SpsPpsEnd";
     static const char* sps_pps_end = "SpsPpsEnd";
     static const char* unknown = "Unknown";
     static const char* unknown = "Unknown";
@@ -1912,6 +1991,109 @@ const char* srs_human_flv_video_frame_type2string(char frame_type)
     return unknown;
     return unknown;
 }
 }
 
 
+const char* srs_human_flv_audio_sound_format2string(char sound_format)
+{
+    static const char* linear_pcm = "LinearPCM";
+    static const char* ad_pcm = "ADPCM";
+    static const char* mp3 = "MP3";
+    static const char* linear_pcm_le = "LinearPCMLe";
+    static const char* nellymoser_16khz = "NellymoserKHz16";
+    static const char* nellymoser_8khz = "NellymoserKHz8";
+    static const char* nellymoser = "Nellymoser";
+    static const char* g711_a_pcm = "G711APCM";
+    static const char* g711_mu_pcm = "G711MuPCM";
+    static const char* reserved = "Reserved";
+    static const char* aac = "AAC";
+    static const char* speex = "Speex";
+    static const char* mp3_8khz = "MP3KHz8";
+    static const char* device_specific = "DeviceSpecific";
+    static const char* unknown = "Unknown";
+    
+    switch (sound_format) {
+        case 0: return linear_pcm;
+        case 1: return ad_pcm;
+        case 2: return mp3;
+        case 3: return linear_pcm_le;
+        case 4: return nellymoser_16khz;
+        case 5: return nellymoser_8khz;
+        case 6: return nellymoser;
+        case 7: return g711_a_pcm;
+        case 8: return g711_mu_pcm;
+        case 9: return reserved;
+        case 10: return aac;
+        case 11: return speex;
+        case 14: return mp3_8khz;
+        case 15: return device_specific;
+        default: return unknown;
+    }
+    
+    return unknown;
+}
+
+const char* srs_human_flv_audio_sound_rate2string(char sound_rate)
+{
+    static const char* khz_5_5 = "5.5KHz";
+    static const char* khz_11 = "11KHz";
+    static const char* khz_22 = "22KHz";
+    static const char* khz_44 = "44KHz";
+    static const char* unknown = "Unknown";
+    
+    switch (sound_rate) {
+        case 0: return khz_5_5;
+        case 1: return khz_11;
+        case 2: return khz_22;
+        case 3: return khz_44;
+        default: return unknown;
+    }
+    
+    return unknown;
+}
+
+const char* srs_human_flv_audio_sound_size2string(char sound_size)
+{
+    static const char* bit_8 = "8bit";
+    static const char* bit_16 = "16bit";
+    static const char* unknown = "Unknown";
+    
+    switch (sound_size) {
+        case 0: return bit_8;
+        case 1: return bit_16;
+        default: return unknown;
+    }
+    
+    return unknown;
+}
+
+const char* srs_human_flv_audio_sound_type2string(char sound_type)
+{
+    static const char* mono = "Mono";
+    static const char* stereo = "Stereo";
+    static const char* unknown = "Unknown";
+    
+    switch (sound_type) {
+        case 0: return mono;
+        case 1: return stereo;
+        default: return unknown;
+    }
+    
+    return unknown;
+}
+
+const char* srs_human_flv_audio_aac_packet_type2string(char aac_packet_type)
+{
+    static const char* sps_pps = "SH";
+    static const char* raw = "Raw";
+    static const char* unknown = "Unknown";
+    
+    switch (aac_packet_type) {
+        case 0: return sps_pps;
+        case 1: return raw;
+        default: return unknown;
+    }
+    
+    return unknown;
+}
+
 int srs_human_print_rtmp_packet(char type, u_int32_t timestamp, char* data, int size)
 int srs_human_print_rtmp_packet(char type, u_int32_t timestamp, char* data, int size)
 {
 {
     int ret = ERROR_SUCCESS;
     int ret = ERROR_SUCCESS;
@@ -1924,13 +2106,19 @@ int srs_human_print_rtmp_packet(char type, u_int32_t timestamp, char* data, int
     if (type == SRS_RTMP_TYPE_VIDEO) {
     if (type == SRS_RTMP_TYPE_VIDEO) {
         srs_human_trace("Video packet type=%s, dts=%d, pts=%d, size=%d, %s(%s,%s)", 
         srs_human_trace("Video packet type=%s, dts=%d, pts=%d, size=%d, %s(%s,%s)", 
             srs_human_flv_tag_type2string(type), timestamp, pts, size,
             srs_human_flv_tag_type2string(type), timestamp, pts, size,
-            srs_human_flv_video_codec_id2string(srs_utils_get_flv_video_codec_id(data, size)),
-            srs_human_flv_video_avc_packet_type2string(srs_utils_get_flv_video_avc_packet_type(data, size)),
-            srs_human_flv_video_frame_type2string(srs_utils_get_flv_video_frame_type(data, size))
+            srs_human_flv_video_codec_id2string(srs_utils_flv_video_codec_id(data, size)),
+            srs_human_flv_video_avc_packet_type2string(srs_utils_flv_video_avc_packet_type(data, size)),
+            srs_human_flv_video_frame_type2string(srs_utils_flv_video_frame_type(data, size))
         );
         );
     } else if (type == SRS_RTMP_TYPE_AUDIO) {
     } else if (type == SRS_RTMP_TYPE_AUDIO) {
-        srs_human_trace("Audio packet type=%s, dts=%d, pts=%d, size=%d", 
-            srs_human_flv_tag_type2string(type), timestamp, pts, size);
+        srs_human_trace("Audio packet type=%s, dts=%d, pts=%d, size=%d, %s(%s,%s,%s,%s)", 
+            srs_human_flv_tag_type2string(type), timestamp, pts, size,
+            srs_human_flv_audio_sound_format2string(srs_utils_flv_audio_sound_format(data, size)),
+            srs_human_flv_audio_sound_rate2string(srs_utils_flv_audio_sound_rate(data, size)),
+            srs_human_flv_audio_sound_size2string(srs_utils_flv_audio_sound_size(data, size)),
+            srs_human_flv_audio_sound_type2string(srs_utils_flv_audio_sound_type(data, size)),
+            srs_human_flv_audio_aac_packet_type2string(srs_utils_flv_audio_aac_packet_type(data, size))
+        );
     } else if (type == SRS_RTMP_TYPE_SCRIPT) {
     } else if (type == SRS_RTMP_TYPE_SCRIPT) {
         srs_human_verbose("Data packet type=%s, time=%d, size=%d", 
         srs_human_verbose("Data packet type=%s, time=%d, size=%d", 
             srs_human_flv_tag_type2string(type), timestamp, size);
             srs_human_flv_tag_type2string(type), timestamp, size);

@@ -592,17 +592,17 @@ extern void srs_amf0_strict_array_append(srs_amf0_t amf0, srs_amf0_t value);
 * get the current system time in ms.
 * get the current system time in ms.
 * use gettimeofday() to get system time.
 * use gettimeofday() to get system time.
 */
 */
-extern int64_t srs_utils_get_time_ms();
+extern int64_t srs_utils_time_ms();
 
 
 /**
 /**
 * get the send bytes.
 * get the send bytes.
 */
 */
-extern int64_t srs_utils_get_send_bytes(srs_rtmp_t rtmp);
+extern int64_t srs_utils_send_bytes(srs_rtmp_t rtmp);
 
 
 /**
 /**
 * get the recv bytes.
 * get the recv bytes.
 */
 */
-extern int64_t srs_utils_get_recv_bytes(srs_rtmp_t rtmp);
+extern int64_t srs_utils_recv_bytes(srs_rtmp_t rtmp);
 
 
 /**
 /**
 * parse the dts and pts by time in header and data in tag,
 * parse the dts and pts by time in header and data in tag,
@@ -635,7 +635,7 @@ extern int srs_utils_parse_timestamp(
 *           7 = AVC
 *           7 = AVC
 * @return the code id. 0 for error.
 * @return the code id. 0 for error.
 */
 */
-extern char srs_utils_get_flv_video_codec_id(char* data, int size);
+extern char srs_utils_flv_video_codec_id(char* data, int size);
 
 
 /**
 /**
 * get the AVCPacketType of video tag.
 * get the AVCPacketType of video tag.
@@ -646,7 +646,7 @@ extern char srs_utils_get_flv_video_codec_id(char* data, int size);
 *               not required or supported)
 *               not required or supported)
 * @return the avc packet type. -1(0xff) for error.
 * @return the avc packet type. -1(0xff) for error.
 */
 */
-extern char srs_utils_get_flv_video_avc_packet_type(char* data, int size);
+extern char srs_utils_flv_video_avc_packet_type(char* data, int size);
 
 
 /**
 /**
 * get the FrameType of video tag.
 * get the FrameType of video tag.
@@ -658,7 +658,71 @@ extern char srs_utils_get_flv_video_avc_packet_type(char* data, int size);
 *           5 = video info/command frame
 *           5 = video info/command frame
 * @return the frame type. 0 for error.
 * @return the frame type. 0 for error.
 */
 */
-extern char srs_utils_get_flv_video_frame_type(char* data, int size);
+extern char srs_utils_flv_video_frame_type(char* data, int size);
+
+/**
+* get the SoundFormat of audio tag.
+* Format of SoundData. The following values are defined:
+*               0 = Linear PCM, platform endian
+*               1 = ADPCM
+*               2 = MP3
+*               3 = Linear PCM, little endian
+*               4 = Nellymoser 16 kHz mono
+*               5 = Nellymoser 8 kHz mono
+*               6 = Nellymoser
+*               7 = G.711 A-law logarithmic PCM
+*               8 = G.711 mu-law logarithmic PCM
+*               9 = reserved
+*               10 = AAC
+*               11 = Speex
+*               14 = MP3 8 kHz
+*               15 = Device-specific sound
+*               Formats 7, 8, 14, and 15 are reserved.
+*               AAC is supported in Flash Player 9,0,115,0 and higher.
+*               Speex is supported in Flash Player 10 and higher.
+* @return the sound format. -1(0xff) for error.
+*/
+extern char srs_utils_flv_audio_sound_format(char* data, int size);
+
+/**
+* get the SoundRate of audio tag.
+* Sampling rate. The following values are defined:
+*               0 = 5.5 kHz
+*               1 = 11 kHz
+*               2 = 22 kHz
+*               3 = 44 kHz
+* @return the sound rate. -1(0xff) for error.
+*/
+extern char srs_utils_flv_audio_sound_rate(char* data, int size);
+
+/**
+* get the SoundSize of audio tag.
+* Size of each audio sample. This parameter only pertains to
+* uncompressed formats. Compressed formats always decode
+* to 16 bits internally.
+*               0 = 8-bit samples
+*               1 = 16-bit samples
+* @return the sound size. -1(0xff) for error.
+*/
+extern char srs_utils_flv_audio_sound_size(char* data, int size);
+
+/**
+* get the SoundType of audio tag.
+* Mono or stereo sound
+*               0 = Mono sound
+*               1 = Stereo sound
+* @return the sound type. -1(0xff) for error.
+*/
+extern char srs_utils_flv_audio_sound_type(char* data, int size);
+
+/**
+* get the AACPacketType of audio tag.
+* The following values are defined:
+*               0 = AAC sequence header
+*               1 = AAC raw
+* @return the aac packet type. -1(0xff) for error.
+*/
+extern char srs_utils_flv_audio_aac_packet_type(char* data, int size);
 
 
 /*************************************************************
 /*************************************************************
 **************************************************************
 **************************************************************
@@ -699,7 +763,7 @@ extern const char* srs_human_flv_video_codec_id2string(char codec_id);
 
 
 /**
 /**
 * get the avc packet type string.
 * get the avc packet type string.
-*           SpsPps = AVC sequence header
+*           SH = AVC sequence header
 *           Nalu = AVC NALU
 *           Nalu = AVC NALU
 *           SpsPpsEnd = AVC end of sequence
 *           SpsPpsEnd = AVC end of sequence
 *           otherwise, "Unknown"
 *           otherwise, "Unknown"
@@ -722,6 +786,77 @@ extern const char* srs_human_flv_video_avc_packet_type2string(char avc_packet_ty
 extern const char* srs_human_flv_video_frame_type2string(char frame_type);
 extern const char* srs_human_flv_video_frame_type2string(char frame_type);
 
 
 /**
 /**
+* get the SoundFormat string.
+* Format of SoundData. The following values are defined:
+*               LinearPCM = Linear PCM, platform endian
+*               ADPCM = ADPCM
+*               MP3 = MP3
+*               LinearPCMLe = Linear PCM, little endian
+*               NellymoserKHz16 = Nellymoser 16 kHz mono
+*               NellymoserKHz8 = Nellymoser 8 kHz mono
+*               Nellymoser = Nellymoser
+*               G711APCM = G.711 A-law logarithmic PCM
+*               G711MuPCM = G.711 mu-law logarithmic PCM
+*               Reserved = reserved
+*               AAC = AAC
+*               Speex = Speex
+*               MP3KHz8 = MP3 8 kHz
+*               DeviceSpecific = Device-specific sound
+*               otherwise, "Unknown"
+* @remark user never free the return char*, 
+*   it's static shared const string.
+*/
+extern const char* srs_human_flv_audio_sound_format2string(char sound_format);
+
+/**
+* get the SoundRate of audio tag.
+* Sampling rate. The following values are defined:
+*               5.5KHz = 5.5 kHz
+*               11KHz = 11 kHz
+*               22KHz = 22 kHz
+*               44KHz = 44 kHz
+*               otherwise, "Unknown"
+* @remark user never free the return char*, 
+*   it's static shared const string.
+*/
+extern const char* srs_human_flv_audio_sound_rate2string(char sound_rate);
+
+/**
+* get the SoundSize of audio tag.
+* Size of each audio sample. This parameter only pertains to
+* uncompressed formats. Compressed formats always decode
+* to 16 bits internally.
+*               8bit = 8-bit samples
+*               16bit = 16-bit samples
+*               otherwise, "Unknown"
+* @remark user never free the return char*, 
+*   it's static shared const string.
+*/
+extern const char* srs_human_flv_audio_sound_size2string(char sound_size);
+
+/**
+* get the SoundType of audio tag.
+* Mono or stereo sound
+*               Mono = Mono sound
+*               Stereo = Stereo sound
+*               otherwise, "Unknown"
+* @remark user never free the return char*, 
+*   it's static shared const string.
+*/
+extern const char* srs_human_flv_audio_sound_type2string(char sound_type);
+
+/**
+* get the AACPacketType of audio tag.
+* The following values are defined:
+*               SH = AAC sequence header
+*               Raw = AAC raw
+*               otherwise, "Unknown"
+* @remark user never free the return char*, 
+*   it's static shared const string.
+*/
+extern const char* srs_human_flv_audio_aac_packet_type2string(char aac_packet_type);
+
+/**
 * print the rtmp packet, use srs_human_trace/srs_human_verbose for packet,
 * print the rtmp packet, use srs_human_trace/srs_human_verbose for packet,
 * and use srs_human_raw for script data body.
 * and use srs_human_raw for script data body.
 * @return an error code for parse the timetstamp to dts and pts.
 * @return an error code for parse the timetstamp to dts and pts.