2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
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4 * This file is part of CasparCG (www.casparcg.com).
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6 * CasparCG is free software: you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation, either version 3 of the License, or
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9 * (at your option) any later version.
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11 * CasparCG is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 * GNU General Public License for more details.
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16 * You should have received a copy of the GNU General Public License
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17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
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19 * Author: Robert Nagy, ronag89@gmail.com
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22 #include "../../stdafx.h"
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24 #include "audio_decoder.h"
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26 #include "audio_resampler.h"
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28 #include "../util/util.h"
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29 #include "../../ffmpeg_error.h"
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31 #include <core/video_format.h>
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33 #include <common/log.h>
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35 #include <tbb/cache_aligned_allocator.h>
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39 #if defined(_MSC_VER)
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40 #pragma warning (push)
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41 #pragma warning (disable : 4244)
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45 #include <libavformat/avformat.h>
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46 #include <libavcodec/avcodec.h>
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48 #if defined(_MSC_VER)
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49 #pragma warning (pop)
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52 namespace caspar { namespace ffmpeg {
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54 struct audio_decoder::impl : boost::noncopyable
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56 monitor::basic_subject event_subject_;
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58 const std::shared_ptr<AVCodecContext> codec_context_;
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59 const core::video_format_desc format_desc_;
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61 boost::optional<audio_resampler> resampler_;
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63 std::vector<int8_t, tbb::cache_aligned_allocator<int8_t>> buffer1_;
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65 std::queue<spl::shared_ptr<AVPacket>> packets_;
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67 const int64_t nb_frames_;
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68 uint32_t file_frame_number_;
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72 , nb_frames_(0)//context->streams[index_]->nb_frames)
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73 , file_frame_number_(0)
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77 explicit impl(const std::shared_ptr<AVFormatContext>& context, const core::video_format_desc& format_desc)
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78 : format_desc_(format_desc)
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79 , codec_context_(open_codec(*context, AVMEDIA_TYPE_AUDIO, index_))
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80 , resampler_(audio_resampler(format_desc.audio_channels, codec_context_->channels,
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81 format_desc.audio_sample_rate, codec_context_->sample_rate,
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82 AV_SAMPLE_FMT_S32, codec_context_->sample_fmt))
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83 , buffer1_(AVCODEC_MAX_AUDIO_FRAME_SIZE*2)
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84 , nb_frames_(0)//context->streams[index_]->nb_frames)
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86 file_frame_number_ = 0;
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89 void push(const std::shared_ptr<AVPacket>& packet)
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91 if(!packet || !codec_context_)
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94 if(packet->stream_index == index_ || packet->data == nullptr)
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95 packets_.push(spl::make_shared_ptr(packet));
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98 std::shared_ptr<core::audio_buffer> poll()
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100 if(!codec_context_)
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101 return empty_audio();
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103 if(packets_.empty())
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106 auto packet = packets_.front();
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108 if(packet->data == nullptr)
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111 avcodec_flush_buffers(codec_context_.get());
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115 auto audio = decode(*packet);
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117 if(packet->size == 0)
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123 std::shared_ptr<core::audio_buffer> decode(AVPacket& pkt)
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125 buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);
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126 int written_bytes = static_cast<int>(buffer1_.size()) - FF_INPUT_BUFFER_PADDING_SIZE;
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128 int ret = THROW_ON_ERROR2(avcodec_decode_audio3(codec_context_.get(), reinterpret_cast<int16_t*>(buffer1_.data()), &written_bytes, &pkt), "[audio_decoder]");
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130 // There might be several frames in one packet.
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134 buffer1_.resize(written_bytes);
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136 buffer1_ = resampler_->resample(std::move(buffer1_));
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138 const auto n_samples = buffer1_.size() / av_get_bytes_per_sample(AV_SAMPLE_FMT_S32);
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139 const auto samples = reinterpret_cast<int32_t*>(buffer1_.data());
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141 event_subject_ << monitor::event("file/audio/sample-rate") % codec_context_->sample_rate
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142 << monitor::event("file/audio/channels") % codec_context_->channels
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143 << monitor::event("file/audio/format") % u8(av_get_sample_fmt_name(codec_context_->sample_fmt))
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144 << monitor::event("file/audio/codec") % u8(codec_context_->codec->long_name);
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146 file_frame_number_ = static_cast<uint32_t>(pkt.pts);
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148 return std::make_shared<core::audio_buffer>(samples, samples + n_samples);
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153 return !codec_context_ || !packets_.empty();
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158 while(!packets_.empty())
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162 uint32_t nb_frames() const
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164 return 0;//std::max<int64_t>(nb_frames_, file_frame_number_);
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167 std::wstring print() const
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169 return L"[audio-decoder] " + u16(codec_context_->codec->long_name);
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173 audio_decoder::audio_decoder() : impl_(new impl()){}
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174 audio_decoder::audio_decoder(const std::shared_ptr<AVFormatContext>& context, const core::video_format_desc& format_desc) : impl_(new impl(context, format_desc)){}
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175 audio_decoder::audio_decoder(audio_decoder&& other) : impl_(std::move(other.impl_)){}
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176 audio_decoder& audio_decoder::operator=(audio_decoder&& other){impl_ = std::move(other.impl_); return *this;}
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177 void audio_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}
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178 bool audio_decoder::ready() const{return impl_->ready();}
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179 std::shared_ptr<core::audio_buffer> audio_decoder::poll(){return impl_->poll();}
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180 uint32_t audio_decoder::nb_frames() const{return impl_->nb_frames();}
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181 uint32_t audio_decoder::file_frame_number() const{return impl_->file_frame_number_;}
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182 std::wstring audio_decoder::print() const{return impl_->print();}
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183 void audio_decoder::clear(){impl_->clear();}
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184 void audio_decoder::subscribe(const monitor::observable::observer_ptr& o){impl_->event_subject_.subscribe(o);}
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185 void audio_decoder::unsubscribe(const monitor::observable::observer_ptr& o){impl_->event_subject_.unsubscribe(o);}
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