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 \r
  24 #include "../../ffmpeg_error.h"\r
  25 \r
  26 #include <core/video_format.h>\r
  27 \r
  28 #include <tbb/cache_aligned_allocator.h>\r
  29 \r
  30 #include <queue>\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 {\r
  46         \r
  47 struct audio_decoder::implementation : boost::noncopyable\r
  48 {       \r
  49         std::shared_ptr<AVCodecContext>                                                         codec_context_;         \r
  50         const core::video_format_desc                                                           format_desc_;\r
  51         int                                                                                                                     index_;\r
  52         std::shared_ptr<ReSampleContext>                                                        resampler_;\r
  53 \r
  54         std::vector<int8_t,  tbb::cache_aligned_allocator<int8_t>>      buffer1_;\r
  55         std::vector<int8_t,  tbb::cache_aligned_allocator<int8_t>>      buffer2_;\r
  56         std::vector<int16_t, tbb::cache_aligned_allocator<int16_t>>     audio_samples_; \r
  57         std::queue<std::shared_ptr<AVPacket>>                                           packets_;\r
  58 \r
  59         int64_t                                                                                                         nb_frames_;\r
  60 public:\r
  61         explicit implementation(const std::shared_ptr<AVFormatContext>& context, const core::video_format_desc& format_desc) \r
  62                 : format_desc_(format_desc)     \r
  63                 , nb_frames_(0)\r
  64         {                               \r
  65                 try\r
  66                 {\r
  67                         AVCodec* dec;\r
  68                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_AUDIO, -1, -1, &dec, 0), "[audio_decoder]");\r
  69 \r
  70                         THROW_ON_ERROR2(avcodec_open(context->streams[index_]->codec, dec), "[audio_decoder]");\r
  71                         \r
  72                         codec_context_.reset(context->streams[index_]->codec, avcodec_close);\r
  73 \r
  74                         buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);\r
  75 \r
  76                         //nb_frames_ = context->streams[index_]->nb_frames;\r
  77                         //if(nb_frames_ == 0)\r
  78                         //      nb_frames_ = context->streams[index_]->duration * context->streams[index_]->time_base.den;\r
  79 \r
  80                         if(codec_context_->sample_rate  != static_cast<int>(format_desc_.audio_sample_rate) || \r
  81                            codec_context_->channels             != static_cast<int>(format_desc_.audio_channels) ||\r
  82                            codec_context_->sample_fmt   != AV_SAMPLE_FMT_S16)\r
  83                         {       \r
  84                                 auto resampler = av_audio_resample_init(format_desc_.audio_channels,    codec_context_->channels,\r
  85                                                                                                                 format_desc_.audio_sample_rate, codec_context_->sample_rate,\r
  86                                                                                                                 AV_SAMPLE_FMT_S16,                              codec_context_->sample_fmt,\r
  87                                                                                                                 16, 10, 0, 0.8);\r
  88 \r
  89                                 buffer2_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);\r
  90 \r
  91                                 CASPAR_LOG(warning) << L" Invalid audio format. Resampling.";\r
  92 \r
  93                                 if(resampler)\r
  94                                         resampler_.reset(resampler, audio_resample_close);\r
  95                                 else\r
  96                                         codec_context_ = nullptr;\r
  97                         }               \r
  98                 }\r
  99                 catch(...)\r
 100                 {\r
 101                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_VIDEO, -1, -1, nullptr, 0), "[audio_decoder]");\r
 102 \r
 103                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 104                         CASPAR_LOG(warning) << "[audio_decoder] Failed to open audio-stream. Running without audio.";                   \r
 105                 }\r
 106         }\r
 107 \r
 108         void push(const std::shared_ptr<AVPacket>& packet)\r
 109         {                       \r
 110                 if(packet && packet->stream_index != index_)\r
 111                         return;\r
 112 \r
 113                 packets_.push(packet);\r
 114         }       \r
 115         \r
 116         std::vector<std::shared_ptr<std::vector<int16_t>>> poll()\r
 117         {\r
 118                 if(!codec_context_)\r
 119                         return empty_poll();\r
 120 \r
 121                 std::vector<std::shared_ptr<std::vector<int16_t>>> result;\r
 122 \r
 123                 while(!packets_.empty() && result.empty())\r
 124                 {                                               \r
 125                         auto packet = packets_.front();\r
 126 \r
 127                         if(packet)              \r
 128                         {\r
 129                                 result.push_back(decode(*packet));\r
 130                                 if(packet->size == 0)                                   \r
 131                                         packets_.pop();\r
 132                         }\r
 133                         else                    \r
 134                         {       \r
 135                                 avcodec_flush_buffers(codec_context_.get());\r
 136                                 result.push_back(nullptr);\r
 137                                 packets_.pop();\r
 138                         }               \r
 139                 }\r
 140 \r
 141                 return result;\r
 142         }\r
 143 \r
 144         std::vector<std::shared_ptr<std::vector<int16_t>>> empty_poll()\r
 145         {\r
 146                 if(packets_.empty())\r
 147                         return std::vector<std::shared_ptr<std::vector<int16_t>>>();\r
 148                 \r
 149                 auto packet = packets_.front();\r
 150                 packets_.pop();\r
 151 \r
 152                 if(!packet)                     \r
 153                         return boost::assign::list_of(nullptr);\r
 154                 \r
 155                 return boost::assign::list_of(std::make_shared<std::vector<int16_t>>(format_desc_.audio_samples_per_frame, 0)); \r
 156         }\r
 157 \r
 158         std::shared_ptr<std::vector<int16_t>> decode(AVPacket& pkt)\r
 159         {               \r
 160                 int written_bytes = buffer1_.size() - FF_INPUT_BUFFER_PADDING_SIZE;\r
 161 \r
 162                 int ret = THROW_ON_ERROR2(avcodec_decode_audio3(codec_context_.get(), reinterpret_cast<int16_t*>(buffer1_.data()), &written_bytes, &pkt), "[audio_decoder]");\r
 163 \r
 164                 // There might be several frames in one packet.\r
 165                 pkt.size -= ret;\r
 166                 pkt.data += ret;\r
 167                         \r
 168                 if(resampler_)\r
 169                 {\r
 170                         auto ret = audio_resample(resampler_.get(),\r
 171                                                                                 reinterpret_cast<short*>(buffer2_.data()), \r
 172                                                                                 reinterpret_cast<short*>(buffer1_.data()), \r
 173                                                                                 written_bytes / (av_get_bytes_per_sample(codec_context_->sample_fmt) * codec_context_->channels)); \r
 174                         written_bytes = ret * av_get_bytes_per_sample(AV_SAMPLE_FMT_S16) * format_desc_.audio_channels;\r
 175                         std::swap(buffer1_, buffer2_);\r
 176                 }\r
 177 \r
 178                 const auto n_samples = written_bytes / av_get_bytes_per_sample(AV_SAMPLE_FMT_S16);\r
 179                 const auto samples = reinterpret_cast<int16_t*>(buffer1_.data());\r
 180 \r
 181                 return std::make_shared<std::vector<int16_t>>(samples, samples + n_samples);\r
 182         }\r
 183 \r
 184         bool ready() const\r
 185         {\r
 186                 return !codec_context_ || packets_.size() > 2;\r
 187         }\r
 188 };\r
 189 \r
 190 audio_decoder::audio_decoder(const std::shared_ptr<AVFormatContext>& context, const core::video_format_desc& format_desc) : impl_(new implementation(context, format_desc)){}\r
 191 void audio_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}\r
 192 bool audio_decoder::ready() const{return impl_->ready();}\r
 193 std::vector<std::shared_ptr<std::vector<int16_t>>> audio_decoder::poll(){return impl_->poll();}\r
 194 int64_t audio_decoder::nb_frames() const{return impl_->nb_frames_;}\r
 195 }