for #310, refine code to support he/hev2, use aac object.

@@ -1397,15 +1397,15 @@ int SrsSource::on_audio(SrsCommonMessage* __audio)
         
         // when got audio stream info.
         SrsStatistic* stat = SrsStatistic::instance();
-        if ((ret = stat->on_audio_info(_req, SrsCodecAudioAAC, sample.sound_rate, sample.sound_type, codec.aac_profile)) != ERROR_SUCCESS) {
+        if ((ret = stat->on_audio_info(_req, SrsCodecAudioAAC, sample.sound_rate, sample.sound_type, codec.aac_object)) != ERROR_SUCCESS) {
             return ret;
         }
         
         srs_trace("%dB audio sh, "
-            "codec(%d, profile=%d, %dchannels, %dkbps, %dHZ), "
+            "codec(%d, profile=%s, %dchannels, %dkbps, %dHZ), "
             "flv(%dbits, %dchannels, %dHZ)", 
             msg.size, codec.audio_codec_id,
-            codec.aac_profile, codec.aac_channels, 
+            srs_codec_aac_object2str(codec.aac_object).c_str(), codec.aac_channels, 
             codec.audio_data_rate / 1000, aac_sample_rates[codec.aac_sample_rate], 
             flv_sample_sizes[sample.sound_size], flv_sound_types[sample.sound_type], 
             flv_sample_rates[sample.sound_rate]);

@@ -60,7 +60,7 @@ SrsStatisticStream::SrsStatisticStream()
     acodec = SrsCodecAudioReserved1;
     asample_rate = SrsCodecAudioSampleRateReserved;
     asound_type = SrsCodecAudioSoundTypeReserved;
-    aac_profile = SrsAacProfileReserved;
+    aac_object = SrsAacObjectTypeReserved;
 }
 
 SrsStatisticStream::~SrsStatisticStream()
@@ -128,7 +128,7 @@ int SrsStatistic::on_video_info(SrsRequest* req,
 
 int SrsStatistic::on_audio_info(SrsRequest* req,
     SrsCodecAudio acodec, SrsCodecAudioSampleRate asample_rate, SrsCodecAudioSoundType asound_type,
-    SrsAacProfile aac_profile
+    SrsAacObjectType aac_object
 ) {
     int ret = ERROR_SUCCESS;
     
@@ -139,7 +139,7 @@ int SrsStatistic::on_audio_info(SrsRequest* req,
     stream->acodec = acodec;
     stream->asample_rate = asample_rate;
     stream->asound_type = asound_type;
-    stream->aac_profile = aac_profile;
+    stream->aac_object = aac_object;
     
     return ret;
 }
@@ -257,7 +257,7 @@ int SrsStatistic::dumps_streams(stringstream& ss)
                         << __SRS_JFIELD_STR("codec", srs_codec_audio2str(stream->acodec)) << __SRS_JFIELD_CONT
                         << __SRS_JFIELD_ORG("sample_rate", (int)flv_sample_rates[stream->asample_rate]) << __SRS_JFIELD_CONT
                         << __SRS_JFIELD_ORG("channel", (int)stream->asound_type + 1) << __SRS_JFIELD_CONT
-                        << __SRS_JFIELD_STR("profile", srs_codec_aac_profile2str(stream->aac_profile))
+                        << __SRS_JFIELD_STR("profile", srs_codec_aac_object2str(stream->aac_object))
                     << __SRS_JOBJECT_END;
         }
         

@@ -73,7 +73,7 @@ public:
     * 1.5.1.1 Audio object type definition, page 23,
     *           in aac-mp4a-format-ISO_IEC_14496-3+2001.pdf.
     */
-    SrsAacProfile aac_profile;
+    SrsAacObjectType aac_object;
 public:
     SrsStatisticStream();
     virtual ~SrsStatisticStream();
@@ -120,7 +120,7 @@ public:
     */
     virtual int on_audio_info(SrsRequest* req,
         SrsCodecAudio acodec, SrsCodecAudioSampleRate asample_rate, SrsCodecAudioSoundType asound_type,
-        SrsAacProfile aac_profile
+        SrsAacObjectType aac_object
     );
     /**
     * when close stream.

@@ -43,7 +43,7 @@ SrsAacEncoder::SrsAacEncoder()
     _fs = NULL;
     got_sequence_header = false;
     tag_stream = new SrsStream();
-    aac_profile = SrsAacProfileReserved;
+    aac_object = SrsAacObjectTypeReserved;
 }
 
 SrsAacEncoder::~SrsAacEncoder()
@@ -131,7 +131,7 @@ int SrsAacEncoder::write_audio(int64_t timestamp, char* data, int size)
         aac_sample_rate = ((audioObjectType << 1) & 0x0e) | ((aac_sample_rate >> 7) & 0x01);
         
         audioObjectType = (audioObjectType >> 3) & 0x1f;
-        aac_profile = srs_codec_aac_rtmp2ts((SrsAacObjectType)audioObjectType);
+        aac_object = (SrsAacObjectType)audioObjectType;
         
         got_sequence_header = true;
         
@@ -186,6 +186,7 @@ int SrsAacEncoder::write_audio(int64_t timestamp, char* data, int size)
         // channel_configuration 3 uimsbf
         // original/copy 1 bslbf
         // home 1 bslbf
+        SrsAacProfile aac_profile = srs_codec_aac_rtmp2ts(aac_object);
         *pp++ = ((aac_profile << 6) & 0xc0) | ((aac_sample_rate << 2) & 0x3c) | ((aac_channels >> 2) & 0x01);
         // 4bits left.
         // adts_variable_header(), 1.A.2.2.2 Variable Header of ADTS

@@ -45,7 +45,7 @@ class SrsAacEncoder
 private:
     SrsFileWriter* _fs;
 private:
-    SrsAacProfile aac_profile;
+    SrsAacObjectType aac_object;
     int8_t aac_sample_rate;
     int8_t aac_channels;
     bool got_sequence_header;

@@ -294,7 +294,7 @@ SrsAvcAacCodec::SrsAvcAacCodec()
 
     avc_profile                 = 0;
     avc_level                   = 0;
-    aac_profile                 = SrsAacProfileReserved;
+    aac_object                  = SrsAacObjectTypeReserved;
     aac_sample_rate             = __SRS_AAC_SAMPLE_RATE_UNSET; // sample rate ignored
     aac_channels                = 0;
     avc_extra_size              = 0;
@@ -493,8 +493,8 @@ int SrsAvcAacCodec::audio_aac_sequence_header_demux(char* data, int size)
     aac_sample_rate = samplingFrequencyIndex;
 
     // convert the object type in sequence header to aac profile of ADTS.
-    aac_profile = srs_codec_aac_rtmp2ts((SrsAacObjectType)profile_ObjectType);
-    if (aac_profile == SrsAacProfileReserved) {
+    aac_object = (SrsAacObjectType)profile_ObjectType;
+    if (aac_object == SrsAacObjectTypeReserved) {
         ret = ERROR_HLS_DECODE_ERROR;
         srs_error("audio codec decode aac sequence header failed, "
             "adts object=%d invalid. ret=%d", profile_ObjectType, ret);

@@ -472,7 +472,7 @@ public:
     * 1.5.1.1 Audio object type definition, page 23,
     *           in aac-mp4a-format-ISO_IEC_14496-3+2001.pdf.
     */
-    SrsAacProfile   aac_profile;
+    SrsAacObjectType    aac_object;
     /**
     * samplingFrequencyIndex
     */

@@ -2797,7 +2797,8 @@ int SrsTsCache::do_cache_aac(SrsAvcAacCodec* codec, SrsCodecSample* sample)
         int8_t number_of_raw_data_blocks_in_frame; //2bits, 0 indicating 1 raw_data_block()
         */
         // profile, 2bits
-        adts_header[2] = (codec->aac_profile << 6) & 0xc0;
+        SrsAacProfile aac_profile = srs_codec_aac_rtmp2ts(codec->aac_object);
+        adts_header[2] = (aac_profile << 6) & 0xc0;
         // sampling_frequency_index 4bits
         adts_header[2] |= (codec->aac_sample_rate << 2) & 0x3c;
         // channel_configuration 3bits

@@ -432,7 +432,7 @@ int SrsRawAacStream::adts_demux(SrsStream* stream, char** pframe, int* pnb_frame
         
         // the codec info.
         codec.protection_absent = protection_absent;
-        codec.profile = (SrsAacProfile)profile;
+        codec.aac_object = srs_codec_aac_ts2rtmp((SrsAacProfile)profile);
         codec.sampling_frequency_index = sampling_frequency_index;
         codec.channel_configuration = channel_configuration;
         codec.frame_length = frame_length;
@@ -471,11 +471,11 @@ int SrsRawAacStream::mux_sequence_header(SrsRawAacStreamCodec* codec, string& sh
     int ret = ERROR_SUCCESS;
 
     // only support aac profile 1-4.
-    if (codec->profile == SrsAacProfileReserved) {
+    if (codec->aac_object == SrsAacObjectTypeReserved) {
         return ERROR_AAC_DATA_INVALID;
     }
     
-    SrsAacObjectType audioObjectType = srs_codec_aac_ts2rtmp(codec->profile);
+    SrsAacObjectType audioObjectType = codec->aac_object;
     char channelConfiguration = codec->channel_configuration;
     char samplingFrequencyIndex = codec->sampling_frequency_index;
 

@@ -94,7 +94,7 @@ public:
 struct SrsRawAacStreamCodec
 {
     int8_t protection_absent;
-    SrsAacProfile profile;
+    SrsAacObjectType aac_object;
     int8_t sampling_frequency_index;
     int8_t channel_configuration;
     int16_t frame_length;