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 "../util/util.h"
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27 #include "../input/input.h"
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28 #include "../../ffmpeg_error.h"
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30 #include <core/video_format.h>
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32 #include <common/log.h>
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34 #include <tbb/cache_aligned_allocator.h>
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38 #if defined(_MSC_VER)
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39 #pragma warning (push)
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40 #pragma warning (disable : 4244)
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44 #include <libavformat/avformat.h>
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45 #include <libavcodec/avcodec.h>
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46 #include <libswresample/swresample.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 uint64_t get_channel_layout(AVCodecContext* dec)
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56 auto layout = (dec->channel_layout && dec->channels == av_get_channel_layout_nb_channels(dec->channel_layout)) ? dec->channel_layout : av_get_default_channel_layout(dec->channels);
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60 struct audio_decoder::impl : boost::noncopyable
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62 monitor::basic_subject event_subject_;
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65 const std::shared_ptr<AVCodecContext> codec_context_;
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66 const core::video_format_desc format_desc_;
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68 std::shared_ptr<SwrContext> swr_;
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70 std::vector<uint8_t, tbb::cache_aligned_allocator<int8_t>> buffer_;
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72 std::shared_ptr<AVPacket> current_packet_;
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80 explicit impl(input& in, const core::video_format_desc& format_desc)
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82 , format_desc_(format_desc)
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83 , codec_context_(open_codec(input_->context(), AVMEDIA_TYPE_AUDIO, index_))
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84 , swr_(swr_alloc_set_opts(nullptr,
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85 av_get_default_channel_layout(format_desc_.audio_channels), AV_SAMPLE_FMT_S32, format_desc_.audio_sample_rate,
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86 get_channel_layout(codec_context_.get()), codec_context_->sample_fmt, codec_context_->sample_rate,
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87 0, nullptr), [](SwrContext* p){swr_free(&p);})
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88 , buffer_(AVCODEC_MAX_AUDIO_FRAME_SIZE*4)
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91 CASPAR_THROW_EXCEPTION(bad_alloc());
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93 THROW_ON_ERROR2(swr_init(swr_.get()), "[audio_decoder]");
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96 std::shared_ptr<core::audio_buffer> poll()
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99 return empty_audio();
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101 if(!current_packet_ && !input_->try_pop_audio(current_packet_))
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104 std::shared_ptr<core::audio_buffer> audio;
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106 if(!current_packet_)
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107 avcodec_flush_buffers(codec_context_.get());
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108 else if(!current_packet_->data)
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110 if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)
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111 audio = decode(*current_packet_);
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114 current_packet_.reset();
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118 audio = decode(*current_packet_);
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120 if(current_packet_->size == 0)
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121 current_packet_.reset();
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124 return audio ? audio : poll();
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127 std::shared_ptr<core::audio_buffer> decode(AVPacket& pkt)
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129 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);
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132 auto len = THROW_ON_ERROR2(avcodec_decode_audio4(codec_context_.get(), decoded_frame.get(), &got_frame, &pkt), "[audio_decoder]");
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146 const uint8_t *in[] = {decoded_frame->data[0]};
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147 uint8_t* out[] = {buffer_.data()};
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149 auto channel_samples = swr_convert(swr_.get(),
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150 out, static_cast<int>(buffer_.size()) / format_desc_.audio_channels / av_get_bytes_per_sample(AV_SAMPLE_FMT_S32),
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151 in, decoded_frame->nb_samples);
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153 auto ptr = reinterpret_cast<int32_t*>(buffer_.data());
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155 event_subject_ << monitor::event("file/audio/sample-rate") % codec_context_->sample_rate
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156 << monitor::event("file/audio/channels") % codec_context_->channels
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157 << monitor::event("file/audio/format") % u8(av_get_sample_fmt_name(codec_context_->sample_fmt))
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158 << monitor::event("file/audio/codec") % u8(codec_context_->codec->long_name);
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160 return std::make_shared<core::audio_buffer>(ptr, ptr + channel_samples * format_desc_.audio_channels);
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163 uint32_t nb_frames() const
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168 std::wstring print() const
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170 return L"[audio-decoder] " + u16(codec_context_->codec->long_name);
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174 audio_decoder::audio_decoder() : impl_(new impl()){}
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175 audio_decoder::audio_decoder(input& input, const core::video_format_desc& format_desc) : impl_(new impl(input, format_desc)){}
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176 audio_decoder::audio_decoder(audio_decoder&& other) : impl_(std::move(other.impl_)){}
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177 audio_decoder& audio_decoder::operator=(audio_decoder&& other){impl_ = std::move(other.impl_); return *this;}
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178 std::shared_ptr<core::audio_buffer> audio_decoder::operator()(){return impl_->poll();}
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179 uint32_t audio_decoder::nb_frames() const{return impl_->nb_frames();}
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180 std::wstring audio_decoder::print() const{return impl_->print();}
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181 void audio_decoder::subscribe(const monitor::observable::observer_ptr& o){impl_->event_subject_.subscribe(o);}
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182 void audio_decoder::unsubscribe(const monitor::observable::observer_ptr& o){impl_->event_subject_.unsubscribe(o);}
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