在
Android 4.4.2中,我使用MediaCodec解码mp3文件.
我使用queueInputBuffer()来排队输入mp3编码的帧和dequeueOutputBuffer()来获得解码的帧.
但是解码器从第8帧开始(基于bufferInfo.presentationTimeUs)提供解码输出,并跳过初始7帧.这种情况只发生在几个流中,但不适用于所有流.此外,这种行为在许多运行中是一致的.
我使用queueInputBuffer()来排队输入mp3编码的帧和dequeueOutputBuffer()来获得解码的帧.
但是解码器从第8帧开始(基于bufferInfo.presentationTimeUs)提供解码输出,并跳过初始7帧.这种情况只发生在几个流中,但不适用于所有流.此外,这种行为在许多运行中是一致的.
我想要所有帧的解码输出,我不想跳过任何帧.任何人都可以帮助我了解为什么框架被跳过?我保证流不会被破坏.因为我收到INFO_TRY_AGAIN到第7帧,当有效的缓冲区索引被’dequeueOutputBuffer’返回时,它的呈现时间总是第8帧.
以下是排队码:
Log.e(TAG,"audptOffset = "+audptOffset+"input PT = "+audpt); audcodec.queueInputBuffer(audInbufIndex,audchunkSize,audpt,0);
if(!audoutputDone ){ if(!waitForAudioRelease){ auoutBufIndex = audcodec.dequeueOutputBuffer(auinfo,100); Log.e(TAG,"Output PT = " + auinfo.presentationTimeUs+"auoutBufIndex = "+auoutBufIndex); } if (auoutBufIndex >= 0) { waitForAudioRelease = true; } else if (auoutBufIndex == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) { auddecOutBufArray = audcodec.getoutputBuffers(); } else if (auoutBufIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) { MediaFormat newFormat = audcodec.getoutputFormat(); int sampleRate1 = newFormat.getInteger(MediaFormat.KEY_SAMPLE_RATE); int channelCount1 =newFormat.getInteger(MediaFormat.KEY_CHANNEL_COUNT); Log.e(TAG,"INFO_OUTPUT_FORMAT_CHANGED"); int minBufSize1 = AudioTrack.getMinBufferSize(sampleRate1,(channelCount1==2)? AudioFormat.CHANNEL_OUT_STEREO:AudioFormat.CHANNEL_OUT_MONO,AudioFormat.ENCODING_PCM_16BIT); audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,sampleRate1,(channelCount1==2)?AudioFormat.CHANNEL_OUT_STEREO:AudioFormat.CHANNEL_OUT_MONO,AudioFormat.ENCODING_PCM_16BIT,minBufSize1,AudioTrack.MODE_STREAM); audioTrack.play(); waitForAudioRelease = false; } audioNowUs = System.currentTimeMillis(); if (auoutBufIndex >= 0) { auwhenRealUs = (auinfo.presentationTimeUs/1000) + mStartTimeRealMs - (audptOffset/1000); aulateByUs = audioNowUs - auwhenRealUs; if(!audioWaitTillStartTime){ while((mStartTimeRealMs+((auinfo.presentationTimeUs/1000) - (audptOffset/1000))) >= audioNowUs){ try { Thread.sleep(10); } catch (InterruptedException e) { // Todo Auto-generated catch block e.printstacktrace(); } audioNowUs = System.currentTimeMillis(); } Log.e(TAG,"Play is going to start PT Difference = "+((auinfo.presentationTimeUs/1000) - (audptOffset/1000))); }
添加更多日志:
02-22 17:46:03.164: E/CL(28650): received play command from server 02-22 17:46:03.209: E/RealTimeClient(28650): created decoder for audio/mpeg 02-22 17:46:03.234: E/Music(28650): Output PT = 0 02-22 17:46:03.234: E/Music(28650): pt of first frame received 1215000 02-22 17:46:03.234: E/Music(28650): Input PT = 1215000 02-22 17:46:03.234: E/Music(28650): Output PT = 0 02-22 17:46:03.234: E/Music(28650): Input PT = 1241122 02-22 17:46:03.239: E/Music(28650): Output PT = 0 02-22 17:46:03.239: E/Music(28650): Input PT = 1267244 02-22 17:46:03.239: E/Music(28650): Output PT = 0 02-22 17:46:03.239: E/Music(28650): Input PT = 1293367 02-22 17:46:03.239: E/Music(28650): Output PT = 0 02-22 17:46:03.239: E/Music(28650): Input PT = 1319489 02-22 17:46:03.239: E/Music(28650): Output PT = 0 02-22 17:46:03.244: E/Music(28650): INFO_OUTPUT_FORMAT_CHANGED 02-22 17:46:03.249: I/Reverb(28650): getpid() 28650,IPCThreadState::self()->getCallingPid() 28650 02-22 17:46:03.249: E/Reverb(28650): Reverb::StartElementHandler,wrong element or attributes: boolean 02-22 17:46:03.249: E/Music(28650): Input PT = 1345612 02-22 17:46:03.254: E/Music(28650): Output PT = 1293367 02-22 17:46:03.259: E/Music(28650): Input PT = 1371734 02-22 17:46:03.259: E/Music(28650): Input PT = 1397857 02-22 17:46:03.259: E/Music(28650): Input PT = 1423979 02-22 17:46:03.259: E/Music(28650): Input PT = 1450102 02-22 17:46:03.264: E/Music(28650): Input PT = 1476224 02-22 17:46:03.269: E/Music(28650): Input PT = 1502346 02-22 17:46:03.269: E/Music(28650): Input PT = 1528469 02-22 17:46:03.269: E/Music(28650): Input PT = 1554591 02-22 17:46:03.269: E/Music(28650): Input PT = 1580714 02-22 17:46:03.269: E/Music(28650): Input PT = 1606836 02-22 17:46:03.269: E/Music(28650): Input PT = 1632959 02-22 17:46:03.269: E/Music(28650): Input PT = 1659081 02-22 17:46:04.124: W/AudioTrack(28650): releaseBuffer() track 0x5e2faf28 name=0x3 disabled,restarting 02-22 17:46:04.129: E/Music(28650): Output PT = 1319489 02-22 17:46:04.129: E/Music(28650): Input PT = 1685204 02-22 17:46:04.159: E/Music(28650): Output PT = 1345612