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 <common/concurrency/message.h>\r
  29 #include <core/video_format.h>\r
  30 \r
  31 #include <tbb/cache_aligned_allocator.h>\r
  32 \r
  33 #if defined(_MSC_VER)\r
  34 #pragma warning (push)\r
  35 #pragma warning (disable : 4244)\r
  36 #endif\r
  37 extern "C" \r
  38 {\r
  39         #include <libavformat/avformat.h>\r
  40         #include <libavcodec/avcodec.h>\r
  41 }\r
  42 #if defined(_MSC_VER)\r
  43 #pragma warning (pop)\r
  44 #endif\r
  45 \r
  46 #include <agents.h>\r
  47 #include <semaphore.h>\r
  48 \r
  49 using namespace Concurrency;\r
  50 \r
  51 namespace caspar { namespace ffmpeg {\r
  52         \r
  53 struct audio_decoder::implementation : boost::noncopyable\r
  54 {       \r
  55         int                                                                                                                     index_;\r
  56         std::shared_ptr<AVCodecContext>                                                         codec_context_;         \r
  57         \r
  58         audio_resampler                                                                                         resampler_;\r
  59         \r
  60         std::vector<int8_t,  tbb::cache_aligned_allocator<int8_t>>      buffer1_;\r
  61         \r
  62         safe_ptr<semaphore> semaphore_;\r
  63 \r
  64         transformer<safe_ptr<AVPacket>, std::shared_ptr<core::audio_buffer>> transformer_;      \r
  65 public:\r
  66         explicit implementation(audio_decoder::source_t& source, audio_decoder::target_t& target, AVFormatContext& context, const core::video_format_desc& format_desc) \r
  67                 : codec_context_(open_codec(context, AVMEDIA_TYPE_AUDIO, index_))\r
  68                 , resampler_(format_desc.audio_channels,        codec_context_->channels,\r
  69                                          format_desc.audio_sample_rate, codec_context_->sample_rate,\r
  70                                          AV_SAMPLE_FMT_S32,                             codec_context_->sample_fmt)\r
  71                 , buffer1_(AVCODEC_MAX_AUDIO_FRAME_SIZE*2)\r
  72                 , semaphore_(make_safe<semaphore>(32))\r
  73                 , transformer_([this](const safe_ptr<AVPacket>& packet){return (*this)(packet);}, &target,\r
  74                                            [this](const safe_ptr<AVPacket>& packet){return packet->stream_index == index_;})\r
  75         {               \r
  76                 source.link_target(&transformer_);\r
  77                 CASPAR_LOG(debug) << "[audio_decoder] " << context.streams[index_]->codec->codec->long_name;            \r
  78         }\r
  79         \r
  80         ~implementation()\r
  81         {\r
  82                 semaphore_->release();\r
  83         }\r
  84 \r
  85         std::shared_ptr<core::audio_buffer> operator()(const safe_ptr<AVPacket>& packet)\r
  86         {                       \r
  87                 try\r
  88                 {\r
  89                         auto tok = make_safe<token>(semaphore_);\r
  90 \r
  91                         if(packet == loop_packet(index_))\r
  92                         {\r
  93                                 avcodec_flush_buffers(codec_context_.get());\r
  94                                 return loop_audio();\r
  95                         }\r
  96 \r
  97                         if(packet == eof_packet(index_))                        \r
  98                                 return eof_audio();                     \r
  99 \r
 100                         auto result = safe_ptr<core::audio_buffer>(new core::audio_buffer(), [this, tok](core::audio_buffer* p)\r
 101                         {\r
 102                                 delete p;\r
 103                         });\r
 104 \r
 105                         while(packet->size > 0)\r
 106                         {\r
 107                                 buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);\r
 108                                 int written_bytes = buffer1_.size() - FF_INPUT_BUFFER_PADDING_SIZE;\r
 109                 \r
 110                                 int ret = THROW_ON_ERROR2(avcodec_decode_audio3(codec_context_.get(), reinterpret_cast<int16_t*>(buffer1_.data()), &written_bytes, packet.get()), "[audio_decoder]");\r
 111 \r
 112                                 // There might be several frames in one packet.\r
 113                                 packet->size -= ret;\r
 114                                 packet->data += ret;\r
 115                         \r
 116                                 buffer1_.resize(written_bytes);\r
 117 \r
 118                                 buffer1_ = resampler_.resample(std::move(buffer1_));\r
 119                 \r
 120                                 const auto n_samples = buffer1_.size() / av_get_bytes_per_sample(AV_SAMPLE_FMT_S32);\r
 121                                 const auto samples = reinterpret_cast<int32_t*>(buffer1_.data());\r
 122 \r
 123                                 result->insert(result->end(), samples, samples + n_samples);\r
 124                         }\r
 125                         return result;\r
 126                 }\r
 127                 catch(...)\r
 128                 {\r
 129                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 130                         return eof_audio();\r
 131                 }\r
 132         }\r
 133 };\r
 134 \r
 135 audio_decoder::audio_decoder(source_t& source, target_t& target, AVFormatContext& context, const core::video_format_desc& format_desc)\r
 136         : impl_(new implementation(source, target, context, format_desc))\r
 137 {\r
 138 }\r
 139 \r
 140 int64_t audio_decoder::nb_frames() const\r
 141 {\r
 142         return 0;\r
 143 }\r
 144 \r
 145 \r
 146 }}