2 * Copyright 2013 Sveriges Television AB http://casparcg.com/
4 * This file is part of CasparCG (www.casparcg.com).
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.
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.
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/>.
19 * Author: Robert Nagy, ronag89@gmail.com
22 #include "../../StdAfx.h"
24 #include "audio_filter.h"
26 #include "../../ffmpeg_error.h"
27 #include "../../ffmpeg.h"
28 #include "../util/util.h"
30 #include <common/assert.h>
31 #include <common/except.h>
33 #include <boost/algorithm/string.hpp>
34 #include <boost/thread.hpp>
35 #include <boost/format.hpp>
36 #include <boost/rational.hpp>
44 #pragma warning (push)
45 #pragma warning (disable : 4244)
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>
61 namespace caspar { namespace ffmpeg {
63 std::string create_sourcefilter_str(const audio_input_pad& input_pad, std::string name)
65 const auto asrc_options = (boost::format("abuffer=time_base=%1%/%2%:sample_rate=%3%:sample_fmt=%4%:channel_layout=0x%|5$x| [%6%]")
66 % input_pad.time_base.numerator() % input_pad.time_base.denominator()
67 % input_pad.sample_rate
68 % av_get_sample_fmt_name(input_pad.sample_fmt)
69 % input_pad.audio_channel_layout
75 std::string create_filter_list(const std::vector<std::string>& items)
77 return boost::join(items, "|");
80 std::string channel_layout_to_string(uint64_t channel_layout)
82 return (boost::format("0x%|1$x|") % channel_layout).str();
85 std::string create_sinkfilter_str(const audio_output_pad& output_pad, std::string name)
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); })
92 % create_filter_list(cpplinq::from(output_pad.sample_fmts)
93 .select(&channel_layout_to_string)
95 % create_filter_list(cpplinq::from(output_pad.sample_rates)
96 .select([](int samplerate) { return boost::lexical_cast<std::string>(samplerate); })
100 return asink_options;
103 struct audio_filter::implementation
105 std::string filtergraph_;
107 std::shared_ptr<AVFilterGraph> audio_graph_;
108 std::vector<AVFilterContext*> audio_graph_inputs_;
109 std::vector<AVFilterContext*> audio_graph_outputs_;
111 std::vector<audio_input_pad> input_pads_;
114 std::vector<audio_input_pad> input_pads,
115 std::vector<audio_output_pad> output_pads,
116 const std::string& filtergraph)
117 : filtergraph_(boost::to_lower_copy(filtergraph))
118 , input_pads_(std::move(input_pads))
120 if (input_pads_.empty())
121 CASPAR_THROW_EXCEPTION(invalid_argument() << msg_info("input_pads cannot be empty"));
123 if (output_pads.empty())
124 CASPAR_THROW_EXCEPTION(invalid_argument() << msg_info("output_pads cannot be empty"));
127 avfilter_graph_alloc(),
130 avfilter_graph_free(&p);
133 std::vector<std::string> complete_filter_graph;
137 for (auto& input_pad : input_pads_)
138 complete_filter_graph.push_back(create_sourcefilter_str(input_pad, "a:" + boost::lexical_cast<std::string>(i++)));
141 if (filtergraph_.empty())
142 complete_filter_graph.push_back("[a:0] anull [aout:0]");
144 complete_filter_graph.push_back(filtergraph_);
148 for (auto& output_pad : output_pads)
149 complete_filter_graph.push_back(create_sinkfilter_str(output_pad, "aout:" + boost::lexical_cast<std::string>(i++)));
152 configure_filtergraph(
154 boost::join(complete_filter_graph, ";"),
156 audio_graph_outputs_);
158 if (is_logging_quiet_for_thread())
160 << u16(std::string("\n")
161 + avfilter_graph_dump(
166 << u16(std::string("\n")
167 + avfilter_graph_dump(
172 void configure_filtergraph(
173 AVFilterGraph& graph,
174 const std::string& filtergraph,
175 std::vector<AVFilterContext*>& source_contexts,
176 std::vector<AVFilterContext*>& sink_contexts)
178 AVFilterInOut* outputs = nullptr;
179 AVFilterInOut* inputs = nullptr;
181 FF(avfilter_graph_parse2(
187 // Workaround because outputs and inputs are not filled in for some reason
188 for (unsigned i = 0; i < graph.nb_filters; ++i)
190 auto filter = graph.filters[i];
192 if (std::string(filter->filter->name) == "abuffer")
193 source_contexts.push_back(filter);
195 if (std::string(filter->filter->name) == "abuffersink")
196 sink_contexts.push_back(filter);
199 for (AVFilterInOut* iter = inputs; iter; iter = iter->next)
200 source_contexts.push_back(iter->filter_ctx);
202 for (AVFilterInOut* iter = outputs; iter; iter = iter->next)
203 sink_contexts.push_back(iter->filter_ctx);
205 FF(avfilter_graph_config(
210 void push(int input_pad_id, const std::shared_ptr<AVFrame>& src_av_frame)
212 FF(av_buffersrc_add_frame(
213 audio_graph_inputs_.at(input_pad_id),
214 src_av_frame.get()));
217 void push(int input_pad_id, const boost::iterator_range<const int32_t*>& frame_samples)
219 auto& input_pad = input_pads_.at(input_pad_id);
220 auto num_samples = frame_samples.size() / av_get_channel_layout_nb_channels(input_pad.audio_channel_layout);
221 auto input_frame = ffmpeg::create_frame();
223 input_frame->channels = av_get_channel_layout_nb_channels(input_pad.audio_channel_layout);
224 input_frame->channel_layout = input_pad.audio_channel_layout;
225 input_frame->sample_rate = input_pad.sample_rate;
226 input_frame->nb_samples = static_cast<int>(num_samples);
227 input_frame->format = input_pad.sample_fmt;
228 input_frame->pts = 0;
230 av_samples_fill_arrays(
231 input_frame->extended_data,
232 input_frame->linesize,
233 reinterpret_cast<const std::uint8_t*>(frame_samples.begin()),
234 input_frame->channels,
235 input_frame->nb_samples,
236 static_cast<AVSampleFormat>(input_frame->format),
239 push(input_pad_id, input_frame);
242 std::shared_ptr<AVFrame> poll(int output_pad_id)
244 auto filt_frame = create_frame();
246 const auto ret = av_buffersink_get_frame(
247 audio_graph_outputs_.at(output_pad_id),
250 if(ret == AVERROR_EOF || ret == AVERROR(EAGAIN))
259 audio_filter::audio_filter(
260 std::vector<audio_input_pad> input_pads,
261 std::vector<audio_output_pad> output_pads,
262 const std::string& filtergraph)
263 : impl_(new implementation(std::move(input_pads), std::move(output_pads), filtergraph))
266 audio_filter::audio_filter(audio_filter&& other) : impl_(std::move(other.impl_)){}
267 audio_filter& audio_filter::operator=(audio_filter&& other){impl_ = std::move(other.impl_); return *this;}
268 void audio_filter::push(int input_pad_id, const std::shared_ptr<AVFrame>& frame){impl_->push(input_pad_id, frame);}
269 void audio_filter::push(int input_pad_id, const boost::iterator_range<const int32_t*>& frame_samples) { impl_->push(input_pad_id, frame_samples); }
270 std::shared_ptr<AVFrame> audio_filter::poll(int output_pad_id){return impl_->poll(output_pad_id);}
271 std::wstring audio_filter::filter_str() const{return u16(impl_->filtergraph_);}
272 std::vector<spl::shared_ptr<AVFrame>> audio_filter::poll_all(int output_pad_id)
274 std::vector<spl::shared_ptr<AVFrame>> frames;
275 for(auto frame = poll(output_pad_id); frame; frame = poll(output_pad_id))
276 frames.push_back(spl::make_shared_ptr(frame));