git.sesse.net Git - casparcg/blob - modules/ffmpeg/producer/audio/audio_decoder.cpp

   1 /*\r
   2 * copyright (c) 2010 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 *  This file is part of CasparCG.\r
   5 *\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
  10 *\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
  15 \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
  18 *\r
  19 */\r
  20 #include "../../stdafx.h"\r
  21 \r
  22 #include "audio_decoder.h"\r
  23 #include "audio_resampler.h"\r
  24 \r
  25 #include "../util.h"\r
  26 #include "../../ffmpeg_error.h"\r
  27 \r
  28 #include <core/video_format.h>\r
  29 \r
  30 #include <tbb/cache_aligned_allocator.h>\r
  31 \r
  32 #if defined(_MSC_VER)\r
  33 #pragma warning (push)\r
  34 #pragma warning (disable : 4244)\r
  35 #endif\r
  36 extern "C" \r
  37 {\r
  38         #include <libavformat/avformat.h>\r
  39         #include <libavcodec/avcodec.h>\r
  40 }\r
  41 #if defined(_MSC_VER)\r
  42 #pragma warning (pop)\r
  43 #endif\r
  44 \r
  45 namespace caspar { namespace ffmpeg {\r
  46         \r
  47 struct audio_decoder::implementation : public Concurrency::agent, boost::noncopyable\r
  48 {\r
  49         audio_decoder::source_t& source_;\r
  50         audio_decoder::target_t& target_;\r
  51 \r
  52         std::shared_ptr<AVCodecContext>                                                         codec_context_;         \r
  53         const core::video_format_desc                                                           format_desc_;\r
  54         int                                                                                                                     index_;\r
  55         std::unique_ptr<audio_resampler>                                                        resampler_;\r
  56 \r
  57         std::vector<int8_t,  tbb::cache_aligned_allocator<int8_t>>      buffer1_;\r
  58         \r
  59         int64_t                                                                                                         nb_frames_;\r
  60 public:\r
  61         explicit implementation(audio_decoder::source_t& source,\r
  62                                                         audio_decoder::target_t& target,\r
  63                                                         const safe_ptr<AVFormatContext>& context, \r
  64                                                         const core::video_format_desc& format_desc) \r
  65                 : source_(source)\r
  66                 , target_(target)\r
  67                 , format_desc_(format_desc)     \r
  68                 , nb_frames_(0)\r
  69         {                               \r
  70                 try\r
  71                 {\r
  72                         AVCodec* dec;\r
  73                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_AUDIO, -1, -1, &dec, 0), "[audio_decoder]");\r
  74 \r
  75                         THROW_ON_ERROR2(avcodec_open(context->streams[index_]->codec, dec), "[audio_decoder]");\r
  76                         \r
  77                         codec_context_.reset(context->streams[index_]->codec, avcodec_close);\r
  78 \r
  79                         buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);\r
  80 \r
  81                         resampler_.reset(new audio_resampler(format_desc_.audio_channels,    codec_context_->channels,\r
  82                                                                                                  format_desc_.audio_sample_rate, codec_context_->sample_rate,\r
  83                                                                                                  AV_SAMPLE_FMT_S32,                              codec_context_->sample_fmt));  \r
  84                 }\r
  85                 catch(...)\r
  86                 {\r
  87                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_VIDEO, -1, -1, nullptr, 0), "[audio_decoder]");\r
  88 \r
  89                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  90                         CASPAR_LOG(warning) << "[audio_decoder] Failed to open audio-stream. Running without audio.";                   \r
  91                 }\r
  92 \r
  93                 start();\r
  94         }\r
  95 \r
  96         ~implementation()\r
  97         {\r
  98                 agent::wait(this);\r
  99         }       \r
 100 \r
 101         virtual void run()\r
 102         {\r
 103                 try\r
 104                 {\r
 105                         while(true)\r
 106                         {\r
 107                                 auto packet = Concurrency::receive(source_);\r
 108                                 if(packet == eof_packet())                              \r
 109                                         break;\r
 110                                 \r
 111                                 if(packet == loop_packet())     \r
 112                                 {       \r
 113                                         if(codec_context_)\r
 114                                                 avcodec_flush_buffers(codec_context_.get());\r
 115                                         Concurrency::send(target_, loop_audio());\r
 116                                 }       \r
 117                                 else if(packet->stream_index == index_)\r
 118                                 {\r
 119                                         if(!codec_context_)\r
 120                                                 Concurrency::send(target_, empty_audio());                                      \r
 121                                         else            \r
 122                                                 Concurrency::send(target_, decode(*packet));    \r
 123                                 }\r
 124                         }\r
 125                 }\r
 126                 catch(...)\r
 127                 {\r
 128                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 129                 }\r
 130                 \r
 131                 Concurrency::send(target_, eof_audio());\r
 132 \r
 133                 done();\r
 134         }\r
 135         \r
 136         std::shared_ptr<core::audio_buffer> decode(AVPacket& pkt)\r
 137         {               \r
 138                 buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);\r
 139                 int written_bytes = buffer1_.size() - FF_INPUT_BUFFER_PADDING_SIZE;\r
 140                 \r
 141                 int ret = THROW_ON_ERROR2(avcodec_decode_audio3(codec_context_.get(), reinterpret_cast<int16_t*>(buffer1_.data()), &written_bytes, &pkt), "[audio_decoder]");\r
 142 \r
 143                 // There might be several frames in one packet.\r
 144                 pkt.size -= ret;\r
 145                 pkt.data += ret;\r
 146                         \r
 147                 buffer1_.resize(written_bytes);\r
 148 \r
 149                 buffer1_ = resampler_->resample(std::move(buffer1_));\r
 150                 \r
 151                 const auto n_samples = buffer1_.size() / av_get_bytes_per_sample(AV_SAMPLE_FMT_S32);\r
 152                 const auto samples = reinterpret_cast<int32_t*>(buffer1_.data());\r
 153 \r
 154                 return std::make_shared<core::audio_buffer>(samples, samples + n_samples);\r
 155         }\r
 156 };\r
 157 \r
 158 audio_decoder::audio_decoder(source_t& source,\r
 159                                                          target_t& target,\r
 160                                                          const safe_ptr<AVFormatContext>& context, \r
 161                                                          const core::video_format_desc& format_desc)\r
 162         : impl_(new implementation(source, target, context, format_desc))\r
 163 {\r
 164 }\r
 165 int64_t audio_decoder::nb_frames() const{return impl_->nb_frames_;}\r
 166 \r
 167 }}