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$x| [%6%]")
  66                 % input_pad.time_base.numerator() % input_pad.time_base.denominator()
  67                 % input_pad.sample_rate
  68                 % av_get_sample_fmt_name(input_pad.sample_fmt)
  69                 % input_pad.audio_channel_layout
  70                 % name).str();
  71
  72         return asrc_options;
  73 }
  74
  75 std::string create_filter_list(const std::vector<std::string>& items)
  76 {
  77         return boost::join(items, "|");
  78 }
  79
  80 std::string channel_layout_to_string(int64_t channel_layout)
  81 {
  82         return (boost::format("0x%|1$x|") % channel_layout).str();
  83 }
  84
  85 std::string create_sinkfilter_str(const audio_output_pad& output_pad, std::string name)
  86 {
  87         const auto asink_options = (boost::format("[%4%] abuffersink")//=sample_fmts=%1%:channel_layouts=%2%:sample_rates=%3%")
  88                 % create_filter_list(cpplinq::from(output_pad.sample_fmts)
  89                                 .select(&av_get_sample_fmt_name)
  90                                 .select([](const char* str) { return std::string(str); })
  91                                 .to_vector())
  92                 % create_filter_list(cpplinq::from(output_pad.sample_fmts)
  93                                 .select(&channel_layout_to_string)
  94                                 .to_vector())
  95                 % create_filter_list(cpplinq::from(output_pad.sample_rates)
  96                                 .select([](int samplerate) { return boost::lexical_cast<std::string>(samplerate); })
  97                                 .to_vector())
  98                 % name).str();
  99
 100         return asink_options;
 101 }
 102
 103 struct audio_filter::implementation
 104 {
 105         std::string                                             filtergraph_;
 106
 107         std::shared_ptr<AVFilterGraph>  audio_graph_;
 108         std::vector<AVFilterContext*>   audio_graph_inputs_;
 109         std::vector<AVFilterContext*>   audio_graph_outputs_;
 110
 111         implementation(
 112                 std::vector<audio_input_pad> input_pads,
 113                 std::vector<audio_output_pad> output_pads,
 114                 const std::string& filtergraph)
 115                 : filtergraph_(boost::to_lower_copy(filtergraph))
 116         {
 117                 if (input_pads.empty())
 118                         CASPAR_THROW_EXCEPTION(invalid_argument() << msg_info("input_pads cannot be empty"));
 119
 120                 if (output_pads.empty())
 121                         CASPAR_THROW_EXCEPTION(invalid_argument() << msg_info("output_pads cannot be empty"));
 122
 123                 audio_graph_.reset(
 124                         avfilter_graph_alloc(),
 125                         [](AVFilterGraph* p)
 126                 {
 127                         avfilter_graph_free(&p);
 128                 });
 129
 130                 std::vector<std::string> complete_filter_graph;
 131
 132                 {
 133                         int i = 0;
 134                         for (auto& input_pad : input_pads)
 135                                 complete_filter_graph.push_back(create_sourcefilter_str(input_pad, "a:" + boost::lexical_cast<std::string>(i++)));
 136                 }
 137
 138                 if (filtergraph_.empty())
 139                         complete_filter_graph.push_back("[a:0] anull [aout:0]");
 140                 else
 141                         complete_filter_graph.push_back(filtergraph_);
 142
 143                 {
 144                         int i = 0;
 145                         for (auto& output_pad : output_pads)
 146                                 complete_filter_graph.push_back(create_sinkfilter_str(output_pad, "aout:" + boost::lexical_cast<std::string>(i++)));
 147                 }
 148
 149                 configure_filtergraph(
 150                                 *audio_graph_,
 151                                 boost::join(complete_filter_graph, ";"),
 152                                 audio_graph_inputs_,
 153                                 audio_graph_outputs_);
 154
 155                 if (is_logging_quiet_for_thread())
 156                         CASPAR_LOG(trace)
 157                                 <<      u16(std::string("\n")
 158                                         + avfilter_graph_dump(
 159                                                         audio_graph_.get(),
 160                                                         nullptr));
 161                 else
 162                         CASPAR_LOG(debug)
 163                                 << u16(std::string("\n")
 164                                         + avfilter_graph_dump(
 165                                                 audio_graph_.get(),
 166                                                 nullptr));
 167         }
 168
 169         void configure_filtergraph(
 170                         AVFilterGraph& graph,
 171                         const std::string& filtergraph,
 172                         std::vector<AVFilterContext*>& source_contexts,
 173                         std::vector<AVFilterContext*>& sink_contexts)
 174         {
 175                 AVFilterInOut* outputs  = nullptr;
 176                 AVFilterInOut* inputs   = nullptr;
 177
 178                 FF(avfilter_graph_parse2(
 179                                 &graph,
 180                                 filtergraph.c_str(),
 181                                 &inputs,
 182                                 &outputs));
 183
 184                 // Workaround because outputs and inputs are not filled in for some reason
 185                 for (unsigned i = 0; i < graph.nb_filters; ++i)
 186                 {
 187                         auto filter = graph.filters[i];
 188
 189                         if (std::string(filter->filter->name) == "abuffer")
 190                                 source_contexts.push_back(filter);
 191
 192                         if (std::string(filter->filter->name) == "abuffersink")
 193                                 sink_contexts.push_back(filter);
 194                 }
 195
 196                 for (AVFilterInOut* iter = inputs; iter; iter = iter->next)
 197                         source_contexts.push_back(iter->filter_ctx);
 198
 199                 for (AVFilterInOut* iter = outputs; iter; iter = iter->next)
 200                         sink_contexts.push_back(iter->filter_ctx);
 201
 202                 FF(avfilter_graph_config(
 203                         &graph,
 204                         nullptr));
 205         }
 206
 207         void push(int input_pad_id, const std::shared_ptr<AVFrame>& src_av_frame)
 208         {
 209                 FF(av_buffersrc_add_frame(
 210                         audio_graph_inputs_.at(input_pad_id),
 211                         src_av_frame.get()));
 212         }
 213
 214         std::shared_ptr<AVFrame> poll(int output_pad_id)
 215         {
 216                 auto filt_frame = create_frame();
 217
 218                 const auto ret = av_buffersink_get_frame(
 219                         audio_graph_outputs_.at(output_pad_id),
 220                         filt_frame.get());
 221
 222                 if(ret == AVERROR_EOF || ret == AVERROR(EAGAIN))
 223                         return nullptr;
 224
 225                 FF_RET(ret, "poll");
 226
 227                 return filt_frame;
 228         }
 229 };
 230
 231 audio_filter::audio_filter(
 232                 std::vector<audio_input_pad> input_pads,
 233                 std::vector<audio_output_pad> output_pads,
 234                 const std::string& filtergraph)
 235         : impl_(new implementation(std::move(input_pads), std::move(output_pads), filtergraph))
 236 {
 237 }
 238 audio_filter::audio_filter(audio_filter&& other) : impl_(std::move(other.impl_)){}
 239 audio_filter& audio_filter::operator=(audio_filter&& other){impl_ = std::move(other.impl_); return *this;}
 240 void audio_filter::push(int input_pad_id, const std::shared_ptr<AVFrame>& frame){impl_->push(input_pad_id, frame);}
 241 std::shared_ptr<AVFrame> audio_filter::poll(int output_pad_id){return impl_->poll(output_pad_id);}
 242 std::wstring audio_filter::filter_str() const{return u16(impl_->filtergraph_);}
 243 std::vector<spl::shared_ptr<AVFrame>> audio_filter::poll_all(int output_pad_id)
 244 {
 245         std::vector<spl::shared_ptr<AVFrame>> frames;
 246         for(auto frame = poll(output_pad_id); frame; frame = poll(output_pad_id))
 247                 frames.push_back(spl::make_shared_ptr(frame));
 248         return frames;
 249 }
 250
 251 }}