2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /** @file src/lib/filter_graph.cc
21 * @brief A graph of FFmpeg filters.
25 #include <libavfilter/avfiltergraph.h>
26 #ifdef HAVE_BUFFERSRC_H
27 #include <libavfilter/buffersrc.h>
29 #if (LIBAVFILTER_VERSION_MAJOR == 2 && LIBAVFILTER_VERSION_MINOR >= 53 && LIBAVFILTER_VERSION_MINOR <= 77) || LIBAVFILTER_VERSION_MAJOR == 3
30 #include <libavfilter/avcodec.h>
31 #include <libavfilter/buffersink.h>
32 #elif LIBAVFILTER_VERSION_MAJOR == 2 && LIBAVFILTER_VERSION_MINOR == 15
33 #include <libavfilter/vsrc_buffer.h>
35 #include <libavformat/avio.h>
38 #include "filter_graph.h"
39 #include "ffmpeg_compatibility.h"
41 #include "exceptions.h"
44 #include "ffmpeg_decoder.h"
46 using std::stringstream;
49 using boost::shared_ptr;
52 /** Construct a FilterGraph for the settings in a film.
54 * @param decoder Decoder that we are using.
55 * @param s Size of the images to process.
56 * @param p Pixel format of the images to process.
58 FilterGraph::FilterGraph (shared_ptr<Film> film, FFmpegDecoder* decoder, libdcp::Size s, AVPixelFormat p)
59 : _buffer_src_context (0)
60 , _buffer_sink_context (0)
64 string filters = Filter::ffmpeg_strings (film->filters()).first;
65 if (!filters.empty ()) {
69 filters += crop_string (Position (film->crop().left, film->crop().top), film->cropped_size (decoder->native_size()));
71 AVFilterGraph* graph = avfilter_graph_alloc();
73 throw DecodeError ("Could not create filter graph.");
76 AVFilter* buffer_src = avfilter_get_by_name("buffer");
77 if (buffer_src == 0) {
78 throw DecodeError ("Could not find buffer src filter");
81 AVFilter* buffer_sink = get_sink ();
84 a << _size.width << ":"
85 << _size.height << ":"
86 << _pixel_format << ":"
87 << decoder->time_base_numerator() << ":"
88 << decoder->time_base_denominator() << ":"
89 << decoder->sample_aspect_ratio_numerator() << ":"
90 << decoder->sample_aspect_ratio_denominator();
94 if ((r = avfilter_graph_create_filter (&_buffer_src_context, buffer_src, "in", a.str().c_str(), 0, graph)) < 0) {
95 throw DecodeError ("could not create buffer source");
98 AVBufferSinkParams* sink_params = av_buffersink_params_alloc ();
99 PixelFormat* pixel_fmts = new PixelFormat[2];
100 pixel_fmts[0] = _pixel_format;
101 pixel_fmts[1] = PIX_FMT_NONE;
102 sink_params->pixel_fmts = pixel_fmts;
104 if (avfilter_graph_create_filter (&_buffer_sink_context, buffer_sink, "out", 0, sink_params, graph) < 0) {
105 throw DecodeError ("could not create buffer sink.");
108 AVFilterInOut* outputs = avfilter_inout_alloc ();
109 outputs->name = av_strdup("in");
110 outputs->filter_ctx = _buffer_src_context;
111 outputs->pad_idx = 0;
114 AVFilterInOut* inputs = avfilter_inout_alloc ();
115 inputs->name = av_strdup("out");
116 inputs->filter_ctx = _buffer_sink_context;
120 #if LIBAVFILTER_VERSION_MAJOR == 2 && LIBAVFILTER_VERSION_MINOR == 15
121 if (avfilter_graph_parse (graph, filters.c_str(), inputs, outputs, 0) < 0) {
122 throw DecodeError ("could not set up filter graph.");
125 if (avfilter_graph_parse (graph, filters.c_str(), &inputs, &outputs, 0) < 0) {
126 throw DecodeError ("could not set up filter graph.");
130 if (avfilter_graph_config (graph, 0) < 0) {
131 throw DecodeError ("could not configure filter graph.");
134 /* XXX: leaking `inputs' / `outputs' ? */
137 /** Take an AVFrame and process it using our configured filters, returning a
140 list<shared_ptr<Image> >
141 FilterGraph::process (AVFrame const * frame)
143 list<shared_ptr<Image> > images;
145 #if LIBAVFILTER_VERSION_MAJOR == 2 && LIBAVFILTER_VERSION_MINOR >= 53 && LIBAVFILTER_VERSION_MINOR <= 61
147 if (av_vsrc_buffer_add_frame (_buffer_src_context, frame, 0) < 0) {
148 throw DecodeError ("could not push buffer into filter chain.");
151 #elif LIBAVFILTER_VERSION_MAJOR == 2 && LIBAVFILTER_VERSION_MINOR == 15
154 par.num = sample_aspect_ratio_numerator ();
155 par.den = sample_aspect_ratio_denominator ();
157 if (av_vsrc_buffer_add_frame (_buffer_src_context, frame, 0, par) < 0) {
158 throw DecodeError ("could not push buffer into filter chain.");
163 if (av_buffersrc_write_frame (_buffer_src_context, frame) < 0) {
164 throw DecodeError ("could not push buffer into filter chain.");
169 #if LIBAVFILTER_VERSION_MAJOR == 2 && LIBAVFILTER_VERSION_MINOR >= 15 && LIBAVFILTER_VERSION_MINOR <= 61
170 while (avfilter_poll_frame (_buffer_sink_context->inputs[0])) {
172 while (av_buffersink_read (_buffer_sink_context, 0)) {
175 #if LIBAVFILTER_VERSION_MAJOR == 2 && LIBAVFILTER_VERSION_MINOR >= 15
177 int r = avfilter_request_frame (_buffer_sink_context->inputs[0]);
179 throw DecodeError ("could not request filtered frame");
182 AVFilterBufferRef* filter_buffer = _buffer_sink_context->inputs[0]->cur_buf;
186 AVFilterBufferRef* filter_buffer;
187 if (av_buffersink_get_buffer_ref (_buffer_sink_context, &filter_buffer, 0) < 0) {
194 /* This takes ownership of filter_buffer */
195 images.push_back (shared_ptr<Image> (new FilterBufferImage ((PixelFormat) frame->format, filter_buffer)));
202 /** @param s Image size.
203 * @param p Pixel format.
204 * @return true if this chain can process images with `s' and `p', otherwise false.
207 FilterGraph::can_process (libdcp::Size s, AVPixelFormat p) const
209 return (_size == s && _pixel_format == p);