audio_buffer.h revision a36e5920737c6adbddd3e43b760e5de8431db6e0
17d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)// Copyright 2013 The Chromium Authors. All rights reserved. 27d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 37d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)// found in the LICENSE file. 47d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 57d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#ifndef MEDIA_BASE_AUDIO_BUFFER_H_ 67d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#define MEDIA_BASE_AUDIO_BUFFER_H_ 77d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 87d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#include <vector> 97d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 107d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#include "base/memory/aligned_memory.h" 117d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#include "base/memory/ref_counted.h" 127d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#include "base/memory/scoped_ptr.h" 13eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch#include "base/time/time.h" 147d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#include "media/base/media_export.h" 157d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#include "media/base/sample_format.h" 167d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 177d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)namespace media { 187d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)class AudioBus; 197d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 207d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)// An audio buffer that takes a copy of the data passed to it, holds it, and 217d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)// copies it into an AudioBus when needed. Also supports an end of stream 227d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)// marker. 237d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)class MEDIA_EXPORT AudioBuffer 247d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) : public base::RefCountedThreadSafe<AudioBuffer> { 257d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) public: 267d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // Create an AudioBuffer whose channel data is copied from |data|. For 277d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // interleaved data, only the first buffer is used. For planar data, the 287d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // number of buffers must be equal to |channel_count|. |frame_count| is the 297d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // number of frames in each buffer. |data| must not be null and |frame_count| 307d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // must be >= 0. 317d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // 327d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // TODO(jrummell): Compute duration rather than pass it in. 337d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) static scoped_refptr<AudioBuffer> CopyFrom(SampleFormat sample_format, 347d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) int channel_count, 357d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) int frame_count, 367d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) const uint8* const* data, 377d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) const base::TimeDelta timestamp, 387d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) const base::TimeDelta duration); 397d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 40a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // Create an AudioBuffer with |frame_count| frames. Buffer is allocated, but 41a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // not initialized. Timestamp and duration are set to kNoTimestamp(). 42a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) static scoped_refptr<AudioBuffer> CreateBuffer(SampleFormat sample_format, 43a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) int channel_count, 44a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) int frame_count); 45a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) 467dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch // Create an empty AudioBuffer with |frame_count| frames. 477dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch static scoped_refptr<AudioBuffer> CreateEmptyBuffer( 487dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch int channel_count, 497dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch int frame_count, 507dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch const base::TimeDelta timestamp, 517dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch const base::TimeDelta duration); 527dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch 537d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // Create a AudioBuffer indicating we've reached end of stream. 547d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // Calling any method other than end_of_stream() on the resulting buffer 557d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // is disallowed. 567d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) static scoped_refptr<AudioBuffer> CreateEOSBuffer(); 577d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 587d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // Copy frames into |dest|. |frames_to_copy| is the number of frames to copy. 597dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch // |source_frame_offset| specifies how many frames in the buffer to skip 607d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // first. |dest_frame_offset| is the frame offset in |dest|. The frames are 617d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // converted from their source format into planar float32 data (which is all 627d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // that AudioBus handles). 637d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) void ReadFrames(int frames_to_copy, 647d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) int source_frame_offset, 657d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) int dest_frame_offset, 667d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) AudioBus* dest); 677d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 687dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch // Trim an AudioBuffer by removing |frames_to_trim| frames from the start. 69a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // Timestamp and duration are adjusted to reflect the fewer frames. 707dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch // Note that repeated calls to TrimStart() may result in timestamp() and 717dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch // duration() being off by a few microseconds due to rounding issues. 727dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch void TrimStart(int frames_to_trim); 737dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch 74a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // Trim an AudioBuffer by removing |frames_to_trim| frames from the end. 75a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // Duration is adjusted to reflect the fewer frames. 76a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) void TrimEnd(int frames_to_trim); 77a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) 787dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch // Return the number of channels. 797dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch int channel_count() const { return channel_count_; } 807dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch 817d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // Return the number of frames held. 827dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch int frame_count() const { return adjusted_frame_count_; } 837d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 847d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // Access to constructor parameters. 857d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) base::TimeDelta timestamp() const { return timestamp_; } 867d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) base::TimeDelta duration() const { return duration_; } 877d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 887dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch // TODO(jrummell): Remove set_timestamp() and set_duration() once 897dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch // DecryptingAudioDecoder::EnqueueFrames() is changed to set them when 907dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch // creating the buffer. See http://crbug.com/255261. 917dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch void set_timestamp(base::TimeDelta timestamp) { timestamp_ = timestamp; } 927dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch void set_duration(base::TimeDelta duration) { duration_ = duration; } 937dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch 947d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // If there's no data in this buffer, it represents end of stream. 957dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch bool end_of_stream() const { return end_of_stream_; } 967d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 97a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // Access to the raw buffer for ffmpeg to write directly to. Data for planar 98a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // data is grouped by channel. 99a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) uint8* writable_data() { return data_.get(); } 100a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) 1017d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) private: 1027d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) friend class base::RefCountedThreadSafe<AudioBuffer>; 1037d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 1047d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // Allocates aligned contiguous buffer to hold all channel data (1 block for 1057d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // interleaved data, |channel_count| blocks for planar data), copies 106a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // [data,data+data_size) to the allocated buffer(s). If |data| is null, no 107a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // data is copied. If |create_buffer| is false, no data buffer is created (or 108a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // copied to). 1097d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) AudioBuffer(SampleFormat sample_format, 1107d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) int channel_count, 1117d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) int frame_count, 112a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) bool create_buffer, 1137d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) const uint8* const* data, 1147d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) const base::TimeDelta timestamp, 1157d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) const base::TimeDelta duration); 1167d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 1177d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) virtual ~AudioBuffer(); 1187d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 1197dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch const SampleFormat sample_format_; 1207dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch const int channel_count_; 1217dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch int adjusted_frame_count_; 1227dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch int trim_start_; 1237dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch const bool end_of_stream_; 1247d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) base::TimeDelta timestamp_; 1257d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) base::TimeDelta duration_; 1267d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 1277d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // Contiguous block of channel data. 1287d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) scoped_ptr_malloc<uint8, base::ScopedPtrAlignedFree> data_; 1297d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 1307d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // For planar data, points to each channels data. 1317d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) std::vector<uint8*> channel_data_; 1327d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 1337d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) DISALLOW_IMPLICIT_CONSTRUCTORS(AudioBuffer); 1347d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)}; 1357d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 1367d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)} // namespace media 1377d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) 1387d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#endif // MEDIA_BASE_AUDIO_BUFFER_H_ 139