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 #include <connect.h>\r
  46 #include <semaphore.h>\r
  47 \r
  48 namespace caspar { namespace ffmpeg {\r
  49         \r
  50 struct audio_decoder::implementation : boost::noncopyable\r
  51 {       \r
  52         int                                                                                                                     index_;\r
  53         std::shared_ptr<AVCodecContext>                                                         codec_context_;         \r
  54         \r
  55         audio_resampler                                                                                         resampler_;\r
  56         \r
  57         std::vector<int8_t,  tbb::cache_aligned_allocator<int8_t>>      buffer1_;\r
  58 \r
  59         Concurrency::transformer<std::shared_ptr<AVPacket>, std::shared_ptr<core::audio_buffer>> transformer_;\r
  60         \r
  61 public:\r
  62         explicit implementation(audio_decoder::source_t& source, audio_decoder::target_t& target, AVFormatContext& context, const core::video_format_desc& format_desc) \r
  63                 : codec_context_(open_codec(context, AVMEDIA_TYPE_AUDIO, index_))\r
  64                 , resampler_(format_desc.audio_channels,        codec_context_->channels,\r
  65                                          format_desc.audio_sample_rate, codec_context_->sample_rate,\r
  66                                          AV_SAMPLE_FMT_S32,                             codec_context_->sample_fmt)\r
  67                 , buffer1_(AVCODEC_MAX_AUDIO_FRAME_SIZE*2)\r
  68                 , transformer_(std::bind(&implementation::decode, this, std::placeholders::_1), &target, [this](const std::shared_ptr<AVPacket>& packet)\r
  69                         {\r
  70                                 return packet && packet->stream_index == index_;\r
  71                         })\r
  72         {                               \r
  73                 CASPAR_LOG(debug) << "[audio_decoder] " << context.streams[index_]->codec->codec->long_name;\r
  74 \r
  75                 Concurrency::connect(source, transformer_);\r
  76         }\r
  77 \r
  78         std::shared_ptr<core::audio_buffer> decode(const std::shared_ptr<AVPacket>& packet)\r
  79         {               \r
  80                 if(!packet)\r
  81                         return nullptr;\r
  82 \r
  83                 if(packet == loop_packet(index_))\r
  84                         return loop_audio();\r
  85 \r
  86                 if(packet == eof_packet(index_))\r
  87                         return eof_audio();\r
  88 \r
  89                 auto result = make_safe<core::audio_buffer>();\r
  90 \r
  91                 while(packet->size > 0)\r
  92                 {\r
  93                         buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);\r
  94                         int written_bytes = buffer1_.size() - FF_INPUT_BUFFER_PADDING_SIZE;\r
  95                 \r
  96                         int ret = THROW_ON_ERROR2(avcodec_decode_audio3(codec_context_.get(), reinterpret_cast<int16_t*>(buffer1_.data()), &written_bytes, packet.get()), "[audio_decoder]");\r
  97 \r
  98                         // There might be several frames in one packet.\r
  99                         packet->size -= ret;\r
 100                         packet->data += ret;\r
 101                         \r
 102                         buffer1_.resize(written_bytes);\r
 103 \r
 104                         buffer1_ = resampler_.resample(std::move(buffer1_));\r
 105                 \r
 106                         const auto n_samples = buffer1_.size() / av_get_bytes_per_sample(AV_SAMPLE_FMT_S32);\r
 107                         const auto samples = reinterpret_cast<int32_t*>(buffer1_.data());\r
 108 \r
 109                         result->insert(result->end(), samples, samples + n_samples);\r
 110                 }\r
 111                                 \r
 112                 return result;\r
 113         }\r
 114 };\r
 115 \r
 116 audio_decoder::audio_decoder(audio_decoder::source_t& source, audio_decoder::target_t& target, AVFormatContext& context, const core::video_format_desc& format_desc)\r
 117         : impl_(new implementation(source, target, context, format_desc))\r
 118 {\r
 119 }\r
 120 \r
 121 int64_t audio_decoder::nb_frames() const\r
 122 {\r
 123         return 0;\r
 124 }\r
 125 \r
 126 }}