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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57 const spl::shared_ptr<AVCodecContext> codec_context_;
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58 const core::video_format_desc format_desc_;
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60 audio_resampler resampler_;
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62 std::vector<int8_t, tbb::cache_aligned_allocator<int8_t>> buffer1_;
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64 std::queue<spl::shared_ptr<AVPacket>> packets_;
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66 const int64_t nb_frames_;
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67 tbb::atomic<uint32_t> file_frame_number_;
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69 explicit impl(const spl::shared_ptr<AVFormatContext>& context, const core::video_format_desc& format_desc)
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70 : format_desc_(format_desc)
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71 , codec_context_(open_codec(*context, AVMEDIA_TYPE_AUDIO, index_))
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72 , resampler_(format_desc.audio_channels, codec_context_->channels,
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73 format_desc.audio_sample_rate, codec_context_->sample_rate,
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74 AV_SAMPLE_FMT_S32, codec_context_->sample_fmt)
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75 , buffer1_(AVCODEC_MAX_AUDIO_FRAME_SIZE*2)
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76 , nb_frames_(0)//context->streams[index_]->nb_frames)
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78 file_frame_number_ = 0;
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81 void push(const std::shared_ptr<AVPacket>& packet)
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86 if(packet->stream_index == index_ || packet->data == nullptr)
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87 packets_.push(spl::make_shared_ptr(packet));
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90 std::shared_ptr<core::audio_buffer> poll()
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92 if(packets_.empty())
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95 auto packet = packets_.front();
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97 if(packet->data == nullptr)
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100 file_frame_number_ = static_cast<uint32_t>(packet->pos);
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101 avcodec_flush_buffers(codec_context_.get());
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102 return flush_audio();
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105 auto audio = decode(*packet);
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107 if(packet->size == 0)
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113 std::shared_ptr<core::audio_buffer> decode(AVPacket& pkt)
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115 buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);
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116 int written_bytes = static_cast<int>(buffer1_.size()) - FF_INPUT_BUFFER_PADDING_SIZE;
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118 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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120 // There might be several frames in one packet.
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124 buffer1_.resize(written_bytes);
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126 buffer1_ = resampler_.resample(std::move(buffer1_));
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128 const auto n_samples = buffer1_.size() / av_get_bytes_per_sample(AV_SAMPLE_FMT_S32);
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129 const auto samples = reinterpret_cast<int32_t*>(buffer1_.data());
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131 ++file_frame_number_;
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133 return std::make_shared<core::audio_buffer>(samples, samples + n_samples);
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138 return packets_.size() > 10;
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141 uint32_t nb_frames() const
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143 return 0;//std::max<int64_t>(nb_frames_, file_frame_number_);
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146 std::wstring print() const
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148 return L"[audio-decoder] " + u16(codec_context_->codec->long_name);
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152 audio_decoder::audio_decoder(const spl::shared_ptr<AVFormatContext>& context, const core::video_format_desc& format_desc) : impl_(new impl(context, format_desc)){}
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153 void audio_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}
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154 bool audio_decoder::ready() const{return impl_->ready();}
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155 std::shared_ptr<core::audio_buffer> audio_decoder::poll(){return impl_->poll();}
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156 uint32_t audio_decoder::nb_frames() const{return impl_->nb_frames();}
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157 uint32_t audio_decoder::file_frame_number() const{return impl_->file_frame_number_;}
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158 std::wstring audio_decoder::print() const{return impl_->print();}
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