audio_converter.cc revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd
12a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 22a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 32a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)// found in the LICENSE file. 42a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 52a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "media/base/audio_converter.h" 62a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 72a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include <algorithm> 82a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 92a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "base/bind.h" 102a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "base/bind_helpers.h" 112a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "media/base/audio_pull_fifo.h" 122a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "media/base/channel_mixer.h" 132a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "media/base/multi_channel_resampler.h" 142a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "media/base/vector_math.h" 152a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 162a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)namespace media { 172a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 182a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)AudioConverter::AudioConverter(const AudioParameters& input_params, 192a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const AudioParameters& output_params, 202a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) bool disable_fifo) 212a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) : downmix_early_(false), 222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) resampler_frame_delay_(0), 232a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) input_channel_count_(input_params.channels()) { 242a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) CHECK(input_params.IsValid()); 252a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) CHECK(output_params.IsValid()); 262a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 272a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Handle different input and output channel layouts. 282a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (input_params.channel_layout() != output_params.channel_layout()) { 292a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DVLOG(1) << "Remixing channel layout from " << input_params.channel_layout() 302a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) << " to " << output_params.channel_layout() << "; from " 312a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) << input_params.channels() << " channels to " 322a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) << output_params.channels() << " channels."; 332a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) channel_mixer_.reset(new ChannelMixer(input_params, output_params)); 342a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 352a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Pare off data as early as we can for efficiency. 362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) downmix_early_ = input_params.channels() > output_params.channels(); 372a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (downmix_early_) { 382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DVLOG(1) << "Remixing channel layout prior to resampling."; 392a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // |unmixed_audio_| will be allocated on the fly. 402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } else { 412a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Instead, if we're not downmixing early we need a temporary AudioBus 422a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // which matches the input channel count but uses the output frame size 432a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // since we'll mix into the AudioBus from the output stream. 442a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) unmixed_audio_ = AudioBus::Create( 452a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) input_params.channels(), output_params.frames_per_buffer()); 462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 472a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 482a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 492a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Only resample if necessary since it's expensive. 502a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (input_params.sample_rate() != output_params.sample_rate()) { 512a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DVLOG(1) << "Resampling from " << input_params.sample_rate() << " to " 522a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) << output_params.sample_rate(); 532a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) double io_sample_rate_ratio = input_params.sample_rate() / 542a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) static_cast<double>(output_params.sample_rate()); 552a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) resampler_.reset(new MultiChannelResampler( 562a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) downmix_early_ ? output_params.channels() : 572a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) input_params.channels(), 582a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) io_sample_rate_ratio, base::Bind( 592a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) &AudioConverter::ProvideInput, base::Unretained(this)))); 602a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 612a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 622a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) input_frame_duration_ = base::TimeDelta::FromMicroseconds( 632a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) base::Time::kMicrosecondsPerSecond / 642a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) static_cast<double>(input_params.sample_rate())); 652a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) output_frame_duration_ = base::TimeDelta::FromMicroseconds( 662a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) base::Time::kMicrosecondsPerSecond / 672a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) static_cast<double>(output_params.sample_rate())); 682a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 692a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (disable_fifo) 702a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return; 712a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 722a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Since the resampler / output device may want a different buffer size than 732a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // the caller asked for, we need to use a FIFO to ensure that both sides 742a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // read in chunk sizes they're configured for. 752a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (resampler_.get() || 762a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) input_params.frames_per_buffer() != output_params.frames_per_buffer()) { 772a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DVLOG(1) << "Rebuffering from " << input_params.frames_per_buffer() 782a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) << " to " << output_params.frames_per_buffer(); 792a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) audio_fifo_.reset(new AudioPullFifo( 802a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) downmix_early_ ? output_params.channels() : 812a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) input_params.channels(), 822a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) input_params.frames_per_buffer(), base::Bind( 832a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) &AudioConverter::SourceCallback, 842a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) base::Unretained(this)))); 852a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 862a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 872a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 882a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)AudioConverter::~AudioConverter() {} 892a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 902a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AudioConverter::AddInput(InputCallback* input) { 912a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) transform_inputs_.push_back(input); 922a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 932a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 942a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AudioConverter::RemoveInput(InputCallback* input) { 952a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DCHECK(std::find(transform_inputs_.begin(), transform_inputs_.end(), input) != 962a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) transform_inputs_.end()); 972a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) transform_inputs_.remove(input); 982a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 992a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (transform_inputs_.empty()) 1002a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) Reset(); 1012a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 1022a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1032a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AudioConverter::Reset() { 1042a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (audio_fifo_) 1052a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) audio_fifo_->Clear(); 1062a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (resampler_) 1072a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) resampler_->Flush(); 1082a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 1092a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1102a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AudioConverter::Convert(AudioBus* dest) { 1112a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (transform_inputs_.empty()) { 1122a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) dest->Zero(); 1132a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return; 1142a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 1152a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1162a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) bool needs_mixing = channel_mixer_ && !downmix_early_; 1172a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) AudioBus* temp_dest = needs_mixing ? unmixed_audio_.get() : dest; 1182a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DCHECK(temp_dest); 1192a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1202a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!resampler_ && !audio_fifo_) { 1212a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) SourceCallback(0, temp_dest); 1222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } else { 1232a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (resampler_) 1242a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) resampler_->Resample(temp_dest, temp_dest->frames()); 1252a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) else 1262a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) ProvideInput(0, temp_dest); 1272a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 1282a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1292a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (needs_mixing) { 1302a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DCHECK_EQ(temp_dest->frames(), dest->frames()); 1312a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) channel_mixer_->Transform(temp_dest, dest); 1322a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 1332a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 1342a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1352a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AudioConverter::SourceCallback(int fifo_frame_delay, AudioBus* dest) { 1362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) bool needs_downmix = channel_mixer_ && downmix_early_; 1372a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!mixer_input_audio_bus_ || 1392a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) mixer_input_audio_bus_->frames() != dest->frames()) { 1402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) mixer_input_audio_bus_ = 1412a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) AudioBus::Create(input_channel_count_, dest->frames()); 1422a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 1432a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1442a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (needs_downmix && 1452a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) (!unmixed_audio_ || unmixed_audio_->frames() != dest->frames())) { 1462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // If we're downmixing early we need a temporary AudioBus which matches 1472a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // the the input channel count and input frame size since we're passing 1482a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // |unmixed_audio_| directly to the |source_callback_|. 1492a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) unmixed_audio_ = AudioBus::Create(input_channel_count_, dest->frames()); 1502a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 1512a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1522a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) AudioBus* temp_dest = needs_downmix ? unmixed_audio_.get() : dest; 1532a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1542a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Sanity check our inputs. 1552a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DCHECK_EQ(temp_dest->frames(), mixer_input_audio_bus_->frames()); 1562a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DCHECK_EQ(temp_dest->channels(), mixer_input_audio_bus_->channels()); 1572a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1582a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Calculate the buffer delay for this callback. 1592a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) base::TimeDelta buffer_delay; 1602a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (resampler_) { 1612a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) buffer_delay += base::TimeDelta::FromMicroseconds( 1622a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) resampler_frame_delay_ * output_frame_duration_.InMicroseconds()); 1632a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 1642a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (audio_fifo_) { 1652a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) buffer_delay += base::TimeDelta::FromMicroseconds( 1662a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) fifo_frame_delay * input_frame_duration_.InMicroseconds()); 1672a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 1682a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1692a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Have each mixer render its data into an output buffer then mix the result. 1702a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) for (InputCallbackSet::iterator it = transform_inputs_.begin(); 1712a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) it != transform_inputs_.end(); ++it) { 1722a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) InputCallback* input = *it; 1732a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1742a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) float volume = input->ProvideInput( 1752a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) mixer_input_audio_bus_.get(), buffer_delay); 1762a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1772a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Optimize the most common single input, full volume case. 1782a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (it == transform_inputs_.begin()) { 1792a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (volume == 1.0f) { 1802a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) mixer_input_audio_bus_->CopyTo(temp_dest); 1812a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) continue; 1822a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 1832a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1842a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Zero |temp_dest| otherwise, so we're mixing into a clean buffer. 1852a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) temp_dest->Zero(); 1862a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 1872a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1882a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Volume adjust and mix each mixer input into |temp_dest| after rendering. 1892a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (volume > 0) { 1902a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) for (int i = 0; i < mixer_input_audio_bus_->channels(); ++i) { 1912a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) vector_math::FMAC( 1922a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) mixer_input_audio_bus_->channel(i), volume, 1932a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) mixer_input_audio_bus_->frames(), temp_dest->channel(i)); 1942a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 1952a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 1962a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 1972a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1982a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (needs_downmix) { 1992a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DCHECK_EQ(temp_dest->frames(), dest->frames()); 2002a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) channel_mixer_->Transform(temp_dest, dest); 2012a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 2022a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 2032a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2042a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AudioConverter::ProvideInput(int resampler_frame_delay, AudioBus* dest) { 2052a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) resampler_frame_delay_ = resampler_frame_delay; 2062a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (audio_fifo_) 2072a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) audio_fifo_->Consume(dest, dest->frames()); 2082a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) else 2092a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) SourceCallback(0, dest); 2102a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} 2112a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2122a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)} // namespace media 213