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 "../util/util.h"\r
  27 #include "../../ffmpeg_error.h"\r
  28 \r
  29 #include <core/video_format.h>\r
  30 \r
  31 #include <tbb/cache_aligned_allocator.h>\r
  32 \r
  33 #include <queue>\r
  34 \r
  35 #if defined(_MSC_VER)\r
  36 #pragma warning (push)\r
  37 #pragma warning (disable : 4244)\r
  38 #endif\r
  39 extern "C" \r
  40 {\r
  41         #include <libavformat/avformat.h>\r
  42         #include <libavcodec/avcodec.h>\r
  43 }\r
  44 #if defined(_MSC_VER)\r
  45 #pragma warning (pop)\r
  46 #endif\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         const safe_ptr<AVCodecContext>                                                          codec_context_;         \r
  54         const core::video_format_desc                                                           format_desc_;\r
  55 \r
  56         audio_resampler                                                                                         resampler_;\r
  57 \r
  58         std::vector<int8_t,  tbb::cache_aligned_allocator<int8_t>>      buffer1_;\r
  59 \r
  60         std::queue<safe_ptr<AVPacket>>                                                          packets_;\r
  61 \r
  62         const int64_t                                                                                           nb_frames_;\r
  63         tbb::atomic<size_t>                                                                                     file_frame_number_;\r
  64 public:\r
  65         explicit implementation(const safe_ptr<AVFormatContext>& context, const core::video_format_desc& format_desc) \r
  66                 : 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                 , nb_frames_(0)//context->streams[index_]->nb_frames)\r
  73         {               \r
  74                 file_frame_number_ = 0;\r
  75                 CASPAR_LOG(debug) << "[audio_decoder] " << context->streams[index_]->codec->codec->long_name;      \r
  76         }\r
  77 \r
  78         void push(const std::shared_ptr<AVPacket>& packet)\r
  79         {                       \r
  80                 if(!packet)\r
  81                         return;\r
  82 \r
  83                 if(packet->stream_index == index_ || packet->data == nullptr)\r
  84                         packets_.push(make_safe_ptr(packet));\r
  85         }       \r
  86         \r
  87         std::shared_ptr<core::audio_buffer> poll()\r
  88         {\r
  89                 if(packets_.empty())\r
  90                         return nullptr;\r
  91                                 \r
  92                 auto packet = packets_.front();\r
  93 \r
  94                 if(packet->data == nullptr)\r
  95                 {\r
  96                         packets_.pop();\r
  97                         file_frame_number_ = static_cast<size_t>(packet->pos);\r
  98                         avcodec_flush_buffers(codec_context_.get());\r
  99                         return flush_audio();\r
 100                 }\r
 101 \r
 102                 auto audio = decode(*packet);\r
 103 \r
 104                 if(packet->size == 0)                                   \r
 105                         packets_.pop();\r
 106 \r
 107                 return audio;\r
 108         }\r
 109 \r
 110         std::shared_ptr<core::audio_buffer> decode(AVPacket& pkt)\r
 111         {               \r
 112                 buffer1_.resize(AVCODEC_MAX_AUDIO_FRAME_SIZE*2);\r
 113                 int written_bytes = buffer1_.size() - FF_INPUT_BUFFER_PADDING_SIZE;\r
 114                 \r
 115                 int ret = THROW_ON_ERROR2(avcodec_decode_audio3(codec_context_.get(), reinterpret_cast<int16_t*>(buffer1_.data()), &written_bytes, &pkt), "[audio_decoder]");\r
 116 \r
 117                 // There might be several frames in one packet.\r
 118                 pkt.size -= ret;\r
 119                 pkt.data += ret;\r
 120                         \r
 121                 buffer1_.resize(written_bytes);\r
 122 \r
 123                 buffer1_ = resampler_.resample(std::move(buffer1_));\r
 124                 \r
 125                 const auto n_samples = buffer1_.size() / av_get_bytes_per_sample(AV_SAMPLE_FMT_S32);\r
 126                 const auto samples = reinterpret_cast<int32_t*>(buffer1_.data());\r
 127 \r
 128                 ++file_frame_number_;\r
 129 \r
 130                 return std::make_shared<core::audio_buffer>(samples, samples + n_samples);\r
 131         }\r
 132 \r
 133         bool ready() const\r
 134         {\r
 135                 return packets_.size() > 10;\r
 136         }\r
 137 \r
 138         int64_t nb_frames() const\r
 139         {\r
 140                 return std::max<int64_t>(nb_frames_, file_frame_number_);\r
 141         }\r
 142 };\r
 143 \r
 144 audio_decoder::audio_decoder(const safe_ptr<AVFormatContext>& context, const core::video_format_desc& format_desc) : impl_(new implementation(context, format_desc)){}\r
 145 void audio_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}\r
 146 bool audio_decoder::ready() const{return impl_->ready();}\r
 147 std::shared_ptr<core::audio_buffer> audio_decoder::poll(){return impl_->poll();}\r
 148 int64_t audio_decoder::nb_frames() const{return impl_->nb_frames();}\r
 149 size_t audio_decoder::file_frame_number() const{return impl_->file_frame_number_;}\r
 150 \r
 151 }}