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/util.h"\r
  26 #include "../../ffmpeg_error.h"\r
  27 \r
  28 #include <common/concurrency/governor.h>\r
  29 #include <common/exception/win32_exception.h>\r
  30 #include <core/video_format.h>\r
  31 \r
  32 #include <tbb/cache_aligned_allocator.h>\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 #undef Yield\r
  48 using namespace Concurrency;\r
  49 \r
  50 namespace caspar { namespace ffmpeg {\r
  51         \r
  52 struct audio_decoder::implementation : public agent, boost::noncopyable\r
  53 {       \r
  54         int                                                                                                                     index_;\r
  55         std::shared_ptr<AVCodecContext>                                                         codec_context_;         \r
  56         \r
  57         audio_resampler                                                                                         resampler_;\r
  58         \r
  59         std::vector<int8_t,  tbb::cache_aligned_allocator<int8_t>>      buffer1_;\r
  60 \r
  61         unbounded_buffer<audio_decoder::source_element_t>                       source_;\r
  62         ITarget<audio_decoder::target_element_t>&                                       target_;\r
  63 \r
  64         governor                                                                                                        governor_;\r
  65 \r
  66         tbb::atomic<bool>                                                                                       is_running_;\r
  67         \r
  68 public:\r
  69         explicit implementation(audio_decoder::source_t& source, audio_decoder::target_t& target, AVFormatContext& context, const core::video_format_desc& format_desc) \r
  70                 : codec_context_(open_codec(context, AVMEDIA_TYPE_AUDIO, index_))\r
  71                 , resampler_(format_desc.audio_channels,        codec_context_->channels,\r
  72                                          format_desc.audio_sample_rate, codec_context_->sample_rate,\r
  73                                          AV_SAMPLE_FMT_S32,                             codec_context_->sample_fmt)\r
  74                 , buffer1_(AVCODEC_MAX_AUDIO_FRAME_SIZE*2)\r
  75                 , source_([this](const audio_decoder::source_element_t& packet){return packet->stream_index == index_;})\r
  76                 , target_(target)\r
  77                 , governor_(2)\r
  78         {               \r
  79                 CASPAR_LOG(debug) << "[audio_decoder] " << context.streams[index_]->codec->codec->long_name;\r
  80 \r
  81                 source.link_target(&source_);\r
  82                 \r
  83                 is_running_ = true;\r
  84 \r
  85                 start();\r
  86         }\r
  87 \r
  88         ~implementation()\r
  89         {\r
  90                 is_running_ = false;\r
  91                 governor_.cancel();\r
  92                 agent::wait(this);\r
  93         }\r
  94 \r
  95         virtual void run()\r
  96         {\r
  97                 win32_exception::install_handler();\r
  98 \r
  99                 try\r
 100                 {\r
 101                         while(is_running_)\r
 102                         {               \r
 103                                 auto ticket = governor_.acquire();\r
 104                                 auto packet = receive(source_);\r
 105                         \r
 106                                 if(packet == flush_packet(index_))\r
 107                                 {\r
 108                                         avcodec_flush_buffers(codec_context_.get());\r
 109                                         send(target_, flush_audio());\r
 110                                         continue;\r
 111                                 }\r
 112 \r
 113                                 if(packet == eof_packet(index_))\r
 114                                         break;\r
 115 \r
 116                                 auto result = std::make_shared<core::audio_buffer>();\r
 117                                 \r
 118                                 while(packet->size > 0)\r
 119                                 {\r
 120                                         buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);\r
 121                                         int written_bytes = buffer1_.size() - FF_INPUT_BUFFER_PADDING_SIZE;\r
 122                 \r
 123                                         int ret = THROW_ON_ERROR2(avcodec_decode_audio3(codec_context_.get(), reinterpret_cast<int16_t*>(buffer1_.data()), &written_bytes, packet.get()), "[audio_decoder]");\r
 124 \r
 125                                         // There might be several frames in one packet.\r
 126                                         packet->size -= ret;\r
 127                                         packet->data += ret;\r
 128                         \r
 129                                         buffer1_.resize(written_bytes);\r
 130 \r
 131                                         buffer1_ = resampler_.resample(std::move(buffer1_));\r
 132                 \r
 133                                         const auto n_samples = buffer1_.size() / av_get_bytes_per_sample(AV_SAMPLE_FMT_S32);\r
 134                                         const auto samples = reinterpret_cast<int32_t*>(buffer1_.data());\r
 135 \r
 136                                         auto audio = make_safe<core::audio_buffer>(samples, samples + n_samples);\r
 137 \r
 138                                         send(target_, safe_ptr<core::audio_buffer>(audio.get(), [audio, ticket](core::audio_buffer*){}));\r
 139                                         Context::Yield();\r
 140                                 }\r
 141                         }\r
 142                 }\r
 143                 catch(...)\r
 144                 {\r
 145                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 146                 }\r
 147 \r
 148                 send(target_, eof_audio());\r
 149 \r
 150                 done();\r
 151         }\r
 152 };\r
 153 \r
 154 audio_decoder::audio_decoder(audio_decoder::source_t& source, audio_decoder::target_t& target, AVFormatContext& context, const core::video_format_desc& format_desc)\r
 155         : impl_(new implementation(source, target, context, format_desc))\r
 156 {\r
 157 }\r
 158 \r
 159 int64_t audio_decoder::nb_frames() const\r
 160 {\r
 161         return 0;\r
 162 }\r
 163 \r
 164 }}