git.sesse.net Git - casparcg/blob - modules/ffmpeg/producer/filter/audio_filter.cpp

   1 /*
   2 * Copyright 2013 Sveriges Television AB http://casparcg.com/
   3 *
   4 * This file is part of CasparCG (www.casparcg.com).
   5 *
   6 * CasparCG is free software: you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation, either version 3 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * CasparCG is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
  18 *
  19 * Author: Robert Nagy, ronag89@gmail.com
  20 */
  21
  22 #include "../../StdAfx.h"
  23
  24 #include "audio_filter.h"
  25
  26 #include "../../ffmpeg_error.h"
  27 #include "../../ffmpeg.h"
  28 #include "../util/util.h"
  29
  30 #include <common/assert.h>
  31 #include <common/except.h>
  32
  33 #include <boost/algorithm/string.hpp>
  34 #include <boost/thread.hpp>
  35 #include <boost/format.hpp>
  36 #include <boost/rational.hpp>
  37
  38 #include <cstdio>
  39 #include <sstream>
  40 #include <string>
  41 #include <algorithm>
  42
  43 #if defined(_MSC_VER)
  44 #pragma warning (push)
  45 #pragma warning (disable : 4244)
  46 #endif
  47 extern "C"
  48 {
  49         #include <libavutil/avutil.h>
  50         #include <libavutil/imgutils.h>
  51         #include <libavutil/opt.h>
  52         #include <libavfilter/avfilter.h>
  53         #include <libavfilter/avcodec.h>
  54         #include <libavfilter/buffersink.h>
  55         #include <libavfilter/buffersrc.h>
  56 }
  57 #if defined(_MSC_VER)
  58 #pragma warning (pop)
  59 #endif
  60
  61 namespace caspar { namespace ffmpeg {
  62
  63 std::string create_sourcefilter_str(const audio_input_pad& input_pad, std::string name)
  64 {
  65         const auto asrc_options = (boost::format("abuffer=time_base=%1%/%2%:sample_rate=%3%:sample_fmt=%4%:channel_layout=0x%|5$x| [%6%]")
  66                 % input_pad.time_base.numerator() % input_pad.time_base.denominator()
  67                 % input_pad.sample_rate
  68                 % av_get_sample_fmt_name(input_pad.sample_fmt)
  69                 % input_pad.audio_channel_layout
  70                 % name).str();
  71
  72         return asrc_options;
  73 }
  74
  75 std::string create_sinkfilter_str(const audio_output_pad& output_pad, std::string name)
  76 {
  77         const auto asink_options = (boost::format("[%1%] abuffersink") % name).str();
  78
  79         return asink_options;
  80 }
  81
  82 struct audio_filter::implementation
  83 {
  84         std::string                                             filtergraph_;
  85
  86         std::shared_ptr<AVFilterGraph>  audio_graph_;
  87         std::vector<AVFilterContext*>   audio_graph_inputs_;
  88         std::vector<AVFilterContext*>   audio_graph_outputs_;
  89
  90         std::vector<audio_input_pad>    input_pads_;
  91
  92         implementation(
  93                         std::vector<audio_input_pad> input_pads,
  94                         std::vector<audio_output_pad> output_pads,
  95                         const std::string& filtergraph)
  96                 : filtergraph_(boost::to_lower_copy(filtergraph))
  97                 , input_pads_(std::move(input_pads))
  98         {
  99                 if (input_pads_.empty())
 100                         CASPAR_THROW_EXCEPTION(invalid_argument() << msg_info("input_pads cannot be empty"));
 101
 102                 if (output_pads.empty())
 103                         CASPAR_THROW_EXCEPTION(invalid_argument() << msg_info("output_pads cannot be empty"));
 104
 105                 audio_graph_.reset(
 106                         avfilter_graph_alloc(),
 107                         [](AVFilterGraph* p)
 108                 {
 109                         avfilter_graph_free(&p);
 110                 });
 111
 112                 std::vector<std::string> complete_filter_graph;
 113
 114                 {
 115                         int i = 0;
 116                         for (auto& input_pad : input_pads_)
 117                                 complete_filter_graph.push_back(create_sourcefilter_str(input_pad, "a:" + boost::lexical_cast<std::string>(i++)));
 118                 }
 119
 120                 if (filtergraph_.empty())
 121                         complete_filter_graph.push_back("[a:0] anull [aout:0]");
 122                 else
 123                         complete_filter_graph.push_back(filtergraph_);
 124
 125                 {
 126                         int i = 0;
 127                         for (auto& output_pad : output_pads)
 128                         {
 129                                 complete_filter_graph.push_back(create_sinkfilter_str(output_pad, "aout:" + boost::lexical_cast<std::string>(i++)));
 130
 131                                 output_pad.sample_fmts.push_back(AVSampleFormat::AV_SAMPLE_FMT_NONE);
 132                                 output_pad.audio_channel_layouts.push_back(0);
 133                                 output_pad.sample_rates.push_back(-1);
 134                         }
 135                 }
 136
 137                 configure_filtergraph(
 138                                 *audio_graph_,
 139                                 boost::join(complete_filter_graph, ";"),
 140                                 audio_graph_inputs_,
 141                                 audio_graph_outputs_,
 142                                 output_pads);
 143
 144                 if (is_logging_quiet_for_thread())
 145                         CASPAR_LOG(trace)
 146                                 <<      u16(std::string("\n")
 147                                         + avfilter_graph_dump(
 148                                                         audio_graph_.get(),
 149                                                         nullptr));
 150                 else
 151                         CASPAR_LOG(debug)
 152                                 << u16(std::string("\n")
 153                                         + avfilter_graph_dump(
 154                                                 audio_graph_.get(),
 155                                                 nullptr));
 156         }
 157
 158         void configure_filtergraph(
 159                         AVFilterGraph& graph,
 160                         const std::string& filtergraph,
 161                         std::vector<AVFilterContext*>& source_contexts,
 162                         std::vector<AVFilterContext*>& sink_contexts,
 163                         const std::vector<audio_output_pad>& output_pads)
 164         {
 165                 AVFilterInOut* outputs  = nullptr;
 166                 AVFilterInOut* inputs   = nullptr;
 167
 168                 FF(avfilter_graph_parse2(
 169                                 &graph,
 170                                 filtergraph.c_str(),
 171                                 &inputs,
 172                                 &outputs));
 173
 174                 // Workaround because outputs and inputs are not filled in for some reason
 175                 for (unsigned i = 0; i < graph.nb_filters; ++i)
 176                 {
 177                         auto filter = graph.filters[i];
 178
 179                         if (std::string(filter->filter->name) == "abuffer")
 180                                 source_contexts.push_back(filter);
 181
 182                         if (std::string(filter->filter->name) == "abuffersink")
 183                                 sink_contexts.push_back(filter);
 184                 }
 185
 186                 for (AVFilterInOut* iter = inputs; iter; iter = iter->next)
 187                         source_contexts.push_back(iter->filter_ctx);
 188
 189                 for (AVFilterInOut* iter = outputs; iter; iter = iter->next)
 190                         sink_contexts.push_back(iter->filter_ctx);
 191
 192                 for (int i = 0; i < sink_contexts.size(); ++i)
 193                 {
 194                         auto sink_context = sink_contexts.at(i);
 195                         auto& output_pad = output_pads.at(i);
 196
 197 #pragma warning (push)
 198 #pragma warning (disable : 4245)
 199                         FF(av_opt_set_int_list(
 200                                 sink_context,
 201                                 "sample_fmts",
 202                                 output_pad.sample_fmts.data(),
 203                                 -1,
 204                                 AV_OPT_SEARCH_CHILDREN));
 205
 206                         FF(av_opt_set_int_list(
 207                                 sink_context,
 208                                 "channel_layouts",
 209                                 output_pad.audio_channel_layouts.data(),
 210                                 0,
 211                                 AV_OPT_SEARCH_CHILDREN));
 212
 213                         FF(av_opt_set_int_list(
 214                                 sink_context,
 215                                 "sample_rates",
 216                                 output_pad.sample_rates.data(),
 217                                 -1,
 218                                 AV_OPT_SEARCH_CHILDREN));
 219 #pragma warning (pop)
 220                 }
 221
 222                 FF(avfilter_graph_config(
 223                         &graph,
 224                         nullptr));
 225         }
 226
 227         void set_guaranteed_output_num_samples_per_frame(int output_pad_id, int num_samples)
 228         {
 229                 av_buffersink_set_frame_size(audio_graph_outputs_.at(output_pad_id), num_samples);
 230         }
 231
 232         void push(int input_pad_id, const std::shared_ptr<AVFrame>& src_av_frame)
 233         {
 234                 FF(av_buffersrc_add_frame(
 235                         audio_graph_inputs_.at(input_pad_id),
 236                         src_av_frame.get()));
 237         }
 238
 239         void push(int input_pad_id, const boost::iterator_range<const int32_t*>& frame_samples)
 240         {
 241                 auto& input_pad                         = input_pads_.at(input_pad_id);
 242                 auto num_samples                        = frame_samples.size() / av_get_channel_layout_nb_channels(input_pad.audio_channel_layout);
 243                 auto input_frame                        = ffmpeg::create_frame();
 244
 245                 input_frame->channels           = av_get_channel_layout_nb_channels(input_pad.audio_channel_layout);
 246                 input_frame->channel_layout     = input_pad.audio_channel_layout;
 247                 input_frame->sample_rate                = input_pad.sample_rate;
 248                 input_frame->nb_samples         = static_cast<int>(num_samples);
 249                 input_frame->format                     = input_pad.sample_fmt;
 250                 input_frame->pts                                = 0;
 251
 252                 av_samples_fill_arrays(
 253                                 input_frame->extended_data,
 254                                 input_frame->linesize,
 255                                 reinterpret_cast<const std::uint8_t*>(frame_samples.begin()),
 256                                 input_frame->channels,
 257                                 input_frame->nb_samples,
 258                                 static_cast<AVSampleFormat>(input_frame->format),
 259                                 16);
 260
 261                 push(input_pad_id, input_frame);
 262         }
 263
 264         std::shared_ptr<AVFrame> poll(int output_pad_id)
 265         {
 266                 auto filt_frame = create_frame();
 267
 268                 const auto ret = av_buffersink_get_frame(
 269                         audio_graph_outputs_.at(output_pad_id),
 270                         filt_frame.get());
 271
 272                 if(ret == AVERROR_EOF || ret == AVERROR(EAGAIN))
 273                         return nullptr;
 274
 275                 FF_RET(ret, "poll");
 276
 277                 return filt_frame;
 278         }
 279
 280         const AVFilterLink& get_output_pad_info(int output_pad_id) const
 281         {
 282                 return *audio_graph_outputs_.at(output_pad_id)->inputs[0];
 283         }
 284 };
 285
 286 audio_filter::audio_filter(
 287                 std::vector<audio_input_pad> input_pads,
 288                 std::vector<audio_output_pad> output_pads,
 289                 const std::string& filtergraph)
 290         : impl_(new implementation(std::move(input_pads), std::move(output_pads), filtergraph))
 291 {
 292 }
 293 audio_filter::audio_filter(audio_filter&& other) : impl_(std::move(other.impl_)){}
 294 audio_filter& audio_filter::operator=(audio_filter&& other){impl_ = std::move(other.impl_); return *this;}
 295 void audio_filter::set_guaranteed_output_num_samples_per_frame(int output_pad_id, int num_samples) { impl_->set_guaranteed_output_num_samples_per_frame(output_pad_id, num_samples); }
 296 void audio_filter::push(int input_pad_id, const std::shared_ptr<AVFrame>& frame){impl_->push(input_pad_id, frame);}
 297 void audio_filter::push(int input_pad_id, const boost::iterator_range<const int32_t*>& frame_samples) { impl_->push(input_pad_id, frame_samples); }
 298 std::shared_ptr<AVFrame> audio_filter::poll(int output_pad_id){return impl_->poll(output_pad_id);}
 299 std::wstring audio_filter::filter_str() const{return u16(impl_->filtergraph_);}
 300 int audio_filter::get_num_output_pads() const { return static_cast<int>(impl_->audio_graph_outputs_.size()); }
 301 const AVFilterLink& audio_filter::get_output_pad_info(int output_pad_id) const { return impl_->get_output_pad_info(output_pad_id); }
 302 std::vector<spl::shared_ptr<AVFrame>> audio_filter::poll_all(int output_pad_id)
 303 {
 304         std::vector<spl::shared_ptr<AVFrame>> frames;
 305         for(auto frame = poll(output_pad_id); frame; frame = poll(output_pad_id))
 306                 frames.push_back(spl::make_shared_ptr(frame));
 307         return frames;
 308 }
 309
 310 }}