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 "audio_resampler.h"\r
  25 \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 #include <queue>\r
  33 \r
  34 #if defined(_MSC_VER)\r
  35 #pragma warning (push)\r
  36 #pragma warning (disable : 4244)\r
  37 #endif\r
  38 extern "C" \r
  39 {\r
  40         #include <libavformat/avformat.h>\r
  41         #include <libavcodec/avcodec.h>\r
  42 }\r
  43 #if defined(_MSC_VER)\r
  44 #pragma warning (pop)\r
  45 #endif\r
  46 \r
  47 namespace caspar {\r
  48         \r
  49 struct audio_decoder::implementation : boost::noncopyable\r
  50 {       \r
  51         std::shared_ptr<AVCodecContext>                                                         codec_context_;         \r
  52         const core::video_format_desc                                                           format_desc_;\r
  53         int                                                                                                                     index_;\r
  54         std::unique_ptr<audio_resampler>                                                        resampler_;\r
  55 \r
  56         std::vector<int8_t,  tbb::cache_aligned_allocator<int8_t>>      buffer1_;\r
  57 \r
  58         std::queue<std::shared_ptr<AVPacket>>                                           packets_;\r
  59 \r
  60         int64_t                                                                                                         nb_frames_;\r
  61 public:\r
  62         explicit implementation(const safe_ptr<AVFormatContext>& context, const core::video_format_desc& format_desc) \r
  63                 : format_desc_(format_desc)     \r
  64                 , nb_frames_(0)\r
  65         {                               \r
  66                 try\r
  67                 {\r
  68                         AVCodec* dec;\r
  69                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_AUDIO, -1, -1, &dec, 0), "[audio_decoder]");\r
  70 \r
  71                         THROW_ON_ERROR2(avcodec_open(context->streams[index_]->codec, dec), "[audio_decoder]");\r
  72                         \r
  73                         codec_context_.reset(context->streams[index_]->codec, avcodec_close);\r
  74 \r
  75                         buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);\r
  76 \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
  80                 }\r
  81                 catch(...)\r
  82                 {\r
  83                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_VIDEO, -1, -1, nullptr, 0), "[audio_decoder]");\r
  84 \r
  85                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  86                         CASPAR_LOG(warning) << "[audio_decoder] Failed to open audio-stream. Running without audio.";                   \r
  87                 }\r
  88         }\r
  89 \r
  90         void push(const std::shared_ptr<AVPacket>& packet)\r
  91         {                       \r
  92                 if(packet && packet->stream_index != index_)\r
  93                         return;\r
  94 \r
  95                 packets_.push(packet);\r
  96         }       \r
  97         \r
  98         std::vector<std::shared_ptr<core::audio_buffer>> poll()\r
  99         {\r
 100                 std::vector<std::shared_ptr<core::audio_buffer>> result;\r
 101 \r
 102                 if(packets_.empty())\r
 103                         return result;\r
 104 \r
 105                 if(!codec_context_)\r
 106                         return empty_poll();\r
 107                 \r
 108                 auto packet = packets_.front();\r
 109 \r
 110                 if(packet)              \r
 111                 {\r
 112                         result.push_back(decode(*packet));\r
 113                         if(packet->size == 0)                                   \r
 114                                 packets_.pop();\r
 115                 }\r
 116                 else                    \r
 117                 {       \r
 118                         avcodec_flush_buffers(codec_context_.get());\r
 119                         result.push_back(nullptr);\r
 120                         packets_.pop();\r
 121                 }               \r
 122 \r
 123                 return result;\r
 124         }\r
 125 \r
 126         std::vector<std::shared_ptr<core::audio_buffer>> empty_poll()\r
 127         {\r
 128                 auto packet = packets_.front();\r
 129                 packets_.pop();\r
 130 \r
 131                 if(!packet)                     \r
 132                         return boost::assign::list_of(nullptr);\r
 133                 \r
 134                 return boost::assign::list_of(std::make_shared<core::audio_buffer>(format_desc_.audio_samples_per_frame, 0));   \r
 135         }\r
 136 \r
 137         std::shared_ptr<core::audio_buffer> decode(AVPacket& pkt)\r
 138         {               \r
 139                 buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);\r
 140                 int written_bytes = buffer1_.size() - FF_INPUT_BUFFER_PADDING_SIZE;\r
 141                 \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
 143 \r
 144                 // There might be several frames in one packet.\r
 145                 pkt.size -= ret;\r
 146                 pkt.data += ret;\r
 147                         \r
 148                 buffer1_.resize(written_bytes);\r
 149 \r
 150                 buffer1_ = resampler_->resample(std::move(buffer1_));\r
 151                 \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
 154 \r
 155                 return std::make_shared<core::audio_buffer>(samples, samples + n_samples);\r
 156         }\r
 157 \r
 158         bool ready() const\r
 159         {\r
 160                 return !packets_.empty();\r
 161         }\r
 162 };\r
 163 \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
 169 }