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 <tbb/cache_aligned_allocator.h>
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37 #if defined(_MSC_VER)
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38 #pragma warning (push)
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39 #pragma warning (disable : 4244)
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43 #include <libavformat/avformat.h>
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44 #include <libavcodec/avcodec.h>
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46 #if defined(_MSC_VER)
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47 #pragma warning (pop)
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50 namespace caspar { namespace ffmpeg {
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52 struct audio_decoder::implementation : boost::noncopyable
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55 const safe_ptr<AVCodecContext> codec_context_;
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56 const core::video_format_desc format_desc_;
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58 audio_resampler resampler_;
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60 std::vector<int8_t, tbb::cache_aligned_allocator<int8_t>> buffer1_;
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62 std::queue<safe_ptr<AVPacket>> packets_;
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64 const int64_t nb_frames_;
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65 tbb::atomic<size_t> file_frame_number_;
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67 explicit implementation(const safe_ptr<AVFormatContext>& context, const core::video_format_desc& format_desc)
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68 : format_desc_(format_desc)
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69 , codec_context_(open_codec(*context, AVMEDIA_TYPE_AUDIO, index_))
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70 , resampler_(format_desc.audio_channels, codec_context_->channels,
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71 format_desc.audio_sample_rate, codec_context_->sample_rate,
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72 AV_SAMPLE_FMT_S32, codec_context_->sample_fmt)
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73 , buffer1_(AVCODEC_MAX_AUDIO_FRAME_SIZE*2)
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74 , nb_frames_(0)//context->streams[index_]->nb_frames)
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76 file_frame_number_ = 0;
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77 CASPAR_LOG(debug) << "[audio_decoder] " << context->streams[index_]->codec->codec->long_name;
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80 void push(const std::shared_ptr<AVPacket>& packet)
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85 if(packet->stream_index == index_ || packet->data == nullptr)
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86 packets_.push(make_safe_ptr(packet));
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89 std::shared_ptr<core::audio_buffer> poll()
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91 if(packets_.empty())
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94 auto packet = packets_.front();
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96 if(packet->data == nullptr)
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99 file_frame_number_ = static_cast<size_t>(packet->pos);
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100 avcodec_flush_buffers(codec_context_.get());
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101 return flush_audio();
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104 auto audio = decode(*packet);
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106 if(packet->size == 0)
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112 std::shared_ptr<core::audio_buffer> decode(AVPacket& pkt)
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114 buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);
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115 int written_bytes = buffer1_.size() - FF_INPUT_BUFFER_PADDING_SIZE;
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117 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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119 // There might be several frames in one packet.
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123 buffer1_.resize(written_bytes);
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125 buffer1_ = resampler_.resample(std::move(buffer1_));
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127 const auto n_samples = buffer1_.size() / av_get_bytes_per_sample(AV_SAMPLE_FMT_S32);
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128 const auto samples = reinterpret_cast<int32_t*>(buffer1_.data());
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130 ++file_frame_number_;
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132 return std::make_shared<core::audio_buffer>(samples, samples + n_samples);
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137 return packets_.size() > 10;
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140 int64_t nb_frames() const
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142 return 0;//std::max<int64_t>(nb_frames_, file_frame_number_);
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146 audio_decoder::audio_decoder(const safe_ptr<AVFormatContext>& context, const core::video_format_desc& format_desc) : impl_(new implementation(context, format_desc)){}
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147 void audio_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}
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148 bool audio_decoder::ready() const{return impl_->ready();}
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149 std::shared_ptr<core::audio_buffer> audio_decoder::poll(){return impl_->poll();}
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150 int64_t audio_decoder::nb_frames() const{return impl_->nb_frames();}
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151 size_t audio_decoder::file_frame_number() const{return impl_->file_frame_number_;}
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