1868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// Copyright 2013 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 57dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch#include "content/renderer/media/audio_decoder.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <vector> 87dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/basictypes.h" 107d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#include "base/strings/string_util.h" 11eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch#include "base/time/time.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/audio_bus.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/limits.h" 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/filters/audio_file_reader.h" 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/filters/in_memory_url_protocol.h" 16868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#include "third_party/WebKit/public/platform/WebAudioBus.h" 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)using media::AudioBus; 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)using media::AudioFileReader; 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)using media::InMemoryUrlProtocol; 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)using std::vector; 22f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)using blink::WebAudioBus; 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 247dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdochnamespace content { 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Decode in-memory audio file data. 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool DecodeAudioFileData( 28f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) blink::WebAudioBus* destination_bus, 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* data, size_t data_size, double sample_rate) { 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(destination_bus); 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!destination_bus) 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Uses the FFmpeg library for audio file reading. 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) InMemoryUrlProtocol url_protocol(reinterpret_cast<const uint8*>(data), 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) data_size, false); 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AudioFileReader reader(&url_protocol); 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!reader.Open()) 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t number_of_channels = reader.channels(); 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) double file_sample_rate = reader.sample_rate(); 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t number_of_frames = static_cast<size_t>(reader.number_of_frames()); 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Apply sanity checks to make sure crazy values aren't coming out of 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // FFmpeg. 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!number_of_channels || 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) number_of_channels > static_cast<size_t>(media::limits::kMaxChannels) || 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) file_sample_rate < media::limits::kMinSampleRate || 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) file_sample_rate > media::limits::kMaxSampleRate) 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Allocate and configure the output audio channel data. 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) destination_bus->initialize(number_of_channels, 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) number_of_frames, 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) file_sample_rate); 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Wrap the channel pointers which will receive the decoded PCM audio. 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) vector<float*> audio_data; 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) audio_data.reserve(number_of_channels); 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < number_of_channels; ++i) { 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) audio_data.push_back(destination_bus->channelData(i)); 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_ptr<AudioBus> audio_bus = AudioBus::WrapVector( 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) number_of_frames, audio_data); 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Decode the audio file data. 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(crogers): If our estimate was low, then we still may fail to read 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // all of the data from the file. 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t actual_frames = reader.Read(audio_bus.get()); 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Adjust WebKit's bus to account for the actual file length 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // and valid data read. 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (actual_frames != number_of_frames) { 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_LE(actual_frames, number_of_frames); 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) destination_bus->resizeSmaller(actual_frames); 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) double duration = actual_frames / file_sample_rate; 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Decoded file data -" 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) << " data: " << data 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) << " data size: " << data_size 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) << " duration: " << duration 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) << " number of frames: " << actual_frames 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) << " sample rate: " << file_sample_rate 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) << " number of channels: " << number_of_channels; 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return actual_frames > 0; 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 947dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch} // namespace content 95