2 * copyright (c) 2010 Sveriges Television AB <info@casparcg.com>
\r
4 * This file is part of CasparCG.
\r
6 * CasparCG is free software: you can redistribute it and/or modify
\r
7 * it under the terms of the GNU General Public License as published by
\r
8 * the Free Software Foundation, either version 3 of the License, or
\r
9 * (at your option) any later version.
\r
11 * CasparCG is distributed in the hope that it will be useful,
\r
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
\r
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\r
14 * GNU General Public License for more details.
\r
16 * You should have received a copy of the GNU General Public License
\r
17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
\r
20 #include "../../stdafx.h"
\r
22 #include "audio_decoder.h"
\r
24 #include "audio_resampler.h"
\r
26 #include "../../ffmpeg_error.h"
\r
28 #include <core/video_format.h>
\r
30 #include <tbb/cache_aligned_allocator.h>
\r
34 #if defined(_MSC_VER)
\r
35 #pragma warning (push)
\r
36 #pragma warning (disable : 4244)
\r
40 #include <libavformat/avformat.h>
\r
41 #include <libavcodec/avcodec.h>
\r
43 #if defined(_MSC_VER)
\r
44 #pragma warning (pop)
\r
47 namespace caspar { namespace ffmpeg {
\r
49 struct audio_decoder::implementation : boost::noncopyable
\r
51 std::shared_ptr<AVCodecContext> codec_context_;
\r
52 const core::video_format_desc format_desc_;
\r
54 std::unique_ptr<audio_resampler> resampler_;
\r
56 std::vector<int8_t, tbb::cache_aligned_allocator<int8_t>> buffer1_;
\r
58 std::queue<std::shared_ptr<AVPacket>> packets_;
\r
62 explicit implementation(const safe_ptr<AVFormatContext>& context, const core::video_format_desc& format_desc)
\r
63 : format_desc_(format_desc)
\r
69 index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_AUDIO, -1, -1, &dec, 0), "[audio_decoder]");
\r
71 THROW_ON_ERROR2(avcodec_open(context->streams[index_]->codec, dec), "[audio_decoder]");
\r
73 codec_context_.reset(context->streams[index_]->codec, avcodec_close);
\r
75 buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);
\r
77 resampler_.reset(new audio_resampler(format_desc_.audio_channels, codec_context_->channels,
\r
78 format_desc_.audio_sample_rate, codec_context_->sample_rate,
\r
79 AV_SAMPLE_FMT_S32, codec_context_->sample_fmt));
\r
83 index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_VIDEO, -1, -1, nullptr, 0), "[audio_decoder]");
\r
85 CASPAR_LOG_CURRENT_EXCEPTION();
\r
86 CASPAR_LOG(warning) << "[audio_decoder] Failed to open audio-stream. Running without audio.";
\r
90 void push(const std::shared_ptr<AVPacket>& packet)
\r
92 if(packet && packet->stream_index != index_)
\r
95 packets_.push(packet);
\r
98 std::vector<std::shared_ptr<core::audio_buffer>> poll()
\r
100 std::vector<std::shared_ptr<core::audio_buffer>> result;
\r
102 if(packets_.empty())
\r
105 if(!codec_context_)
\r
106 return empty_poll();
\r
108 auto packet = packets_.front();
\r
112 result.push_back(decode(*packet));
\r
113 if(packet->size == 0)
\r
118 avcodec_flush_buffers(codec_context_.get());
\r
119 result.push_back(nullptr);
\r
126 std::vector<std::shared_ptr<core::audio_buffer>> empty_poll()
\r
128 auto packet = packets_.front();
\r
132 return boost::assign::list_of(nullptr);
\r
134 return boost::assign::list_of(std::make_shared<core::audio_buffer>(format_desc_.audio_samples_per_frame, 0));
\r
137 std::shared_ptr<core::audio_buffer> decode(AVPacket& pkt)
\r
139 buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);
\r
140 int written_bytes = buffer1_.size() - FF_INPUT_BUFFER_PADDING_SIZE;
\r
142 int ret = THROW_ON_ERROR2(avcodec_decode_audio3(codec_context_.get(), reinterpret_cast<int16_t*>(buffer1_.data()), &written_bytes, &pkt), "[audio_decoder]");
\r
144 // There might be several frames in one packet.
\r
148 buffer1_.resize(written_bytes);
\r
150 buffer1_ = resampler_->resample(std::move(buffer1_));
\r
152 const auto n_samples = buffer1_.size() / av_get_bytes_per_sample(AV_SAMPLE_FMT_S32);
\r
153 const auto samples = reinterpret_cast<int32_t*>(buffer1_.data());
\r
155 return std::make_shared<core::audio_buffer>(samples, samples + n_samples);
\r
160 return !packets_.empty();
\r
164 audio_decoder::audio_decoder(const safe_ptr<AVFormatContext>& context, const core::video_format_desc& format_desc) : impl_(new implementation(context, format_desc)){}
\r
165 void audio_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}
\r
166 bool audio_decoder::ready() const{return impl_->ready();}
\r
167 std::vector<std::shared_ptr<core::audio_buffer>> audio_decoder::poll(){return impl_->poll();}
\r
168 int64_t audio_decoder::nb_frames() const{return impl_->nb_frames_;}
\r