Index: media/filters/audio_file_reader.cc |
diff --git a/media/filters/audio_file_reader.cc b/media/filters/audio_file_reader.cc |
index 582ca9cdc7fbbde62cbefc4bea56a84563da4ebc..315164e0c4a5bd1c706881a69f637a53c7c2fd8d 100644 |
--- a/media/filters/audio_file_reader.cc |
+++ b/media/filters/audio_file_reader.cc |
@@ -33,14 +33,7 @@ AudioFileReader::~AudioFileReader() { |
} |
bool AudioFileReader::Open() { |
- if (!OpenDemuxer()) |
- return false; |
- if (!OpenDecoder()) |
- return false; |
- |
- // If the duration is unknown, fail out; this API can not work with streams of |
- // unknown duration currently. |
- return glue_->format_context()->duration != AV_NOPTS_VALUE; |
+ return OpenDemuxer() && OpenDecoder(); |
} |
bool AudioFileReader::OpenDemuxer() { |
@@ -127,6 +120,10 @@ bool AudioFileReader::OpenDecoder() { |
return true; |
} |
+bool AudioFileReader::HasKnownDuration() const { |
+ return glue_->format_context()->duration != AV_NOPTS_VALUE; |
+} |
+ |
void AudioFileReader::Close() { |
codec_context_.reset(); |
glue_.reset(); |
@@ -250,6 +247,124 @@ int AudioFileReader::Read(AudioBus* audio_bus) { |
return current_frame; |
} |
+std::unique_ptr<AudioBus> AudioFileReader::StreamingRead() { |
DaleCurtis
2017/01/25 22:42:25
Needs refactor, so we don't have two copies of the
|
+ DCHECK(glue_.get() && codec_context_) |
+ << "AudioFileReader::StreamingRead() : reader is not opened!"; |
+ size_t bytes_per_sample = av_get_bytes_per_sample(codec_context_->sample_fmt); |
+ |
+ // Holds decoded audio. |
+ std::unique_ptr<AVFrame, ScopedPtrAVFreeFrame> av_frame(av_frame_alloc()); |
+ |
+ // Holds a vector of AudioBus' containing each decoded packet. |
+ std::vector<std::unique_ptr<AudioBus>> decodedAudioPackets; |
+ |
+ AVPacket packet; |
+ int current_frame = 0; |
+ size_t total_frames = 0; |
+ bool continue_decoding = true; |
+ |
+ while (continue_decoding && ReadPacket(&packet)) { |
+ // Make a shallow copy of packet so we can slide packet.data as frames are |
+ // decoded from the packet; otherwise av_packet_unref() will corrupt memory. |
+ AVPacket packet_temp = packet; |
+ do { |
+ // Reset frame to default values. |
+ av_frame_unref(av_frame.get()); |
+ |
+ int frame_decoded = 0; |
+ int result = avcodec_decode_audio4(codec_context_.get(), av_frame.get(), |
+ &frame_decoded, &packet_temp); |
+ |
+ if (result < 0) { |
+ DLOG(WARNING) |
+ << "AudioFileReader::Read() : error in avcodec_decode_audio4() -" |
+ << result; |
+ break; |
+ } |
+ |
+ // Update packet size and data pointer in case we need to call the decoder |
+ // with the remaining bytes from this packet. |
+ packet_temp.size -= result; |
+ packet_temp.data += result; |
+ |
+ if (!frame_decoded) |
+ continue; |
+ |
+ // Determine the number of sample-frames we just decoded. Check overflow. |
+ int frames_read = av_frame->nb_samples; |
+ total_frames += frames_read; |
+ |
+ if (frames_read < 0) { |
+ continue_decoding = false; |
+ break; |
+ } |
+ |
+#ifdef CHROMIUM_NO_AVFRAME_CHANNELS |
+ int channels = |
+ av_get_channel_layout_nb_channels(av_frame->channel_layout); |
+#else |
+ int channels = av_frame->channels; |
+#endif |
+ if (av_frame->sample_rate != sample_rate_ || channels != channels_ || |
+ av_frame->format != av_sample_format_) { |
+ DLOG(ERROR) << "Unsupported midstream configuration change!" |
+ << " Sample Rate: " << av_frame->sample_rate << " vs " |
+ << sample_rate_ << ", Channels: " << channels << " vs " |
+ << channels_ << ", Sample Format: " << av_frame->format |
+ << " vs " << av_sample_format_; |
+ |
+ // This is an unrecoverable error, so bail out. |
+ continue_decoding = false; |
+ break; |
+ } |
+ |
+ // Deinterleave each channel and convert to 32bit floating-point with |
+ // nominal range -1.0 -> +1.0. If the output is already in float planar |
+ // format, just copy it into the AudioBus. |
+ std::unique_ptr<AudioBus> audio_bus = |
+ AudioBus::Create(channels, frames_read); |
+ |
+ if (codec_context_->sample_fmt == AV_SAMPLE_FMT_FLT) { |
DaleCurtis
2017/01/25 22:42:25
I believe there's an AudioBus::FromInterleaved met
|
+ float* decoded_audio_data = reinterpret_cast<float*>(av_frame->data[0]); |
+ int channels = audio_bus->channels(); |
+ for (int ch = 0; ch < channels; ++ch) { |
+ float* bus_data = audio_bus->channel(ch) + current_frame; |
+ for (int i = 0, offset = ch; i < frames_read; |
+ ++i, offset += channels) { |
+ bus_data[i] = decoded_audio_data[offset]; |
+ } |
+ } |
+ } else if (codec_context_->sample_fmt == AV_SAMPLE_FMT_FLTP) { |
+ for (int ch = 0; ch < audio_bus->channels(); ++ch) { |
+ memcpy(audio_bus->channel(ch) + current_frame, |
+ av_frame->extended_data[ch], sizeof(float) * frames_read); |
+ } |
+ } else { |
+ audio_bus->FromInterleavedPartial(av_frame->data[0], current_frame, |
+ frames_read, bytes_per_sample); |
+ } |
+ |
+ decodedAudioPackets.push_back(std::move(audio_bus)); |
+ // current_frame += frames_read; |
+ } while (packet_temp.size > 0); |
+ av_packet_unref(&packet); |
+ } |
+ |
+ // Concatenate all the decoded chunks into one big bus. |
+ std::unique_ptr<AudioBus> outputBus = |
+ AudioBus::Create(channels_, total_frames); |
+ |
+ int dest_start_frame = 0; |
+ for (size_t k = 0; k < decodedAudioPackets.size(); ++k) { |
+ int frame_count = decodedAudioPackets[k]->frames(); |
+ decodedAudioPackets[k]->CopyPartialFramesTo( |
+ 0, frame_count, dest_start_frame, outputBus.get()); |
+ dest_start_frame += frame_count; |
+ } |
+ |
+ return outputBus; |
+} |
+ |
base::TimeDelta AudioFileReader::GetDuration() const { |
const AVRational av_time_base = {1, AV_TIME_BASE}; |