2 * Copyright (c) 2011 Stefano Sabatini
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * libavfilter virtual input device
28 #include "float.h" /* DBL_MIN, DBL_MAX */
30 #include "libavutil/log.h"
31 #include "libavutil/mem.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/parseutils.h"
34 #include "libavutil/pixdesc.h"
35 #include "libavutil/audioconvert.h"
36 #include "libavfilter/avfilter.h"
37 #include "libavfilter/avfiltergraph.h"
38 #include "libavfilter/buffersink.h"
39 #include "libavformat/internal.h"
43 AVClass *class; ///< class for private options
47 AVFilterContext **sinks;
53 static int *create_all_formats(int n)
55 int i, j, *fmts, count = 0;
57 for (i = 0; i < n; i++) {
58 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
59 if (!(desc->flags & PIX_FMT_HWACCEL))
63 if (!(fmts = av_malloc((count+1) * sizeof(int))))
65 for (j = 0, i = 0; i < n; i++) {
66 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
67 if (!(desc->flags & PIX_FMT_HWACCEL))
74 av_cold static int lavfi_read_close(AVFormatContext *avctx)
76 LavfiContext *lavfi = avctx->priv_data;
78 av_freep(&lavfi->sink_stream_map);
79 av_freep(&lavfi->sink_eof);
80 av_freep(&lavfi->stream_sink_map);
81 av_freep(&lavfi->sinks);
82 avfilter_graph_free(&lavfi->graph);
87 av_cold static int lavfi_read_header(AVFormatContext *avctx)
89 LavfiContext *lavfi = avctx->priv_data;
90 AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
91 AVFilter *buffersink, *abuffersink;
92 int *pix_fmts = create_all_formats(AV_PIX_FMT_NB);
93 enum AVMediaType type;
96 #define FAIL(ERR) { ret = ERR; goto end; }
99 FAIL(AVERROR(ENOMEM));
101 avfilter_register_all();
103 buffersink = avfilter_get_by_name("ffbuffersink");
104 abuffersink = avfilter_get_by_name("ffabuffersink");
106 if (!lavfi->graph_str)
107 lavfi->graph_str = av_strdup(avctx->filename);
109 /* parse the graph, create a stream for each open output */
110 if (!(lavfi->graph = avfilter_graph_alloc()))
111 FAIL(AVERROR(ENOMEM));
113 if ((ret = avfilter_graph_parse(lavfi->graph, lavfi->graph_str,
114 &input_links, &output_links, avctx)) < 0)
118 av_log(avctx, AV_LOG_ERROR,
119 "Open inputs in the filtergraph are not acceptable\n");
120 FAIL(AVERROR(EINVAL));
123 /* count the outputs */
124 for (n = 0, inout = output_links; inout; n++, inout = inout->next);
126 if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
127 FAIL(AVERROR(ENOMEM));
128 if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
129 FAIL(AVERROR(ENOMEM));
130 if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
131 FAIL(AVERROR(ENOMEM));
133 for (i = 0; i < n; i++)
134 lavfi->stream_sink_map[i] = -1;
136 /* parse the output link names - they need to be of the form out0, out1, ...
137 * create a mapping between them and the streams */
138 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
140 if (!strcmp(inout->name, "out"))
142 else if (sscanf(inout->name, "out%d\n", &stream_idx) != 1) {
143 av_log(avctx, AV_LOG_ERROR,
144 "Invalid outpad name '%s'\n", inout->name);
145 FAIL(AVERROR(EINVAL));
148 if ((unsigned)stream_idx >= n) {
149 av_log(avctx, AV_LOG_ERROR,
150 "Invalid index was specified in output '%s', "
151 "must be a non-negative value < %d\n",
153 FAIL(AVERROR(EINVAL));
156 /* is an audio or video output? */
157 type = inout->filter_ctx->output_pads[inout->pad_idx].type;
158 if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
159 av_log(avctx, AV_LOG_ERROR,
160 "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
161 FAIL(AVERROR(EINVAL));
164 if (lavfi->stream_sink_map[stream_idx] != -1) {
165 av_log(avctx, AV_LOG_ERROR,
166 "An output with stream index %d was already specified\n",
168 FAIL(AVERROR(EINVAL));
170 lavfi->sink_stream_map[i] = stream_idx;
171 lavfi->stream_sink_map[stream_idx] = i;
174 /* for each open output create a corresponding stream */
175 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
177 if (!(st = avformat_new_stream(avctx, NULL)))
178 FAIL(AVERROR(ENOMEM));
182 /* create a sink for each output and connect them to the graph */
183 lavfi->sinks = av_malloc(sizeof(AVFilterContext *) * avctx->nb_streams);
185 FAIL(AVERROR(ENOMEM));
187 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
188 AVFilterContext *sink;
190 type = inout->filter_ctx->output_pads[inout->pad_idx].type;
192 if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
193 type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
194 av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
195 FAIL(AVERROR_FILTER_NOT_FOUND);
198 if (type == AVMEDIA_TYPE_VIDEO) {
199 AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
201 buffersink_params->pixel_fmts = pix_fmts;
202 ret = avfilter_graph_create_filter(&sink, buffersink,
204 buffersink_params, lavfi->graph);
205 av_freep(&buffersink_params);
209 } else if (type == AVMEDIA_TYPE_AUDIO) {
210 enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8,
214 AV_SAMPLE_FMT_DBL, -1 };
215 AVABufferSinkParams *abuffersink_params = av_abuffersink_params_alloc();
216 abuffersink_params->sample_fmts = sample_fmts;
218 ret = avfilter_graph_create_filter(&sink, abuffersink,
220 abuffersink_params, lavfi->graph);
221 av_free(abuffersink_params);
226 lavfi->sinks[i] = sink;
227 if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
231 /* configure the graph */
232 if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
235 if (lavfi->dump_graph) {
236 char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
242 /* fill each stream with the information in the corresponding sink */
243 for (i = 0; i < avctx->nb_streams; i++) {
244 AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0];
245 AVStream *st = avctx->streams[i];
246 st->codec->codec_type = link->type;
247 avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den);
248 if (link->type == AVMEDIA_TYPE_VIDEO) {
249 st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
250 st->codec->pix_fmt = link->format;
251 st->codec->time_base = link->time_base;
252 st->codec->width = link->w;
253 st->codec->height = link->h;
254 st ->sample_aspect_ratio =
255 st->codec->sample_aspect_ratio = link->sample_aspect_ratio;
256 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
257 st->codec->codec_id = av_get_pcm_codec(link->format, -1);
258 st->codec->channels = av_get_channel_layout_nb_channels(link->channel_layout);
259 st->codec->sample_fmt = link->format;
260 st->codec->sample_rate = link->sample_rate;
261 st->codec->time_base = link->time_base;
262 st->codec->channel_layout = link->channel_layout;
263 if (st->codec->codec_id == AV_CODEC_ID_NONE)
264 av_log(avctx, AV_LOG_ERROR,
265 "Could not find PCM codec for sample format %s.\n",
266 av_get_sample_fmt_name(link->format));
272 avfilter_inout_free(&input_links);
273 avfilter_inout_free(&output_links);
275 lavfi_read_close(avctx);
279 static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
281 LavfiContext *lavfi = avctx->priv_data;
282 double min_pts = DBL_MAX;
283 int stream_idx, min_pts_sink_idx = 0;
284 AVFilterBufferRef *ref;
289 /* iterate through all the graph sinks. Select the sink with the
291 for (i = 0; i < avctx->nb_streams; i++) {
292 AVRational tb = lavfi->sinks[i]->inputs[0]->time_base;
296 if (lavfi->sink_eof[i])
299 ret = av_buffersink_get_buffer_ref(lavfi->sinks[i],
300 &ref, AV_BUFFERSINK_FLAG_PEEK);
301 if (ret == AVERROR_EOF) {
302 av_dlog(avctx, "EOF sink_idx:%d\n", i);
303 lavfi->sink_eof[i] = 1;
307 d = av_rescale_q(ref->pts, tb, AV_TIME_BASE_Q);
308 av_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
312 min_pts_sink_idx = i;
315 if (min_pts == DBL_MAX)
318 av_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
320 av_buffersink_get_buffer_ref(lavfi->sinks[min_pts_sink_idx], &ref, 0);
321 stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
324 size = avpicture_get_size(ref->format, ref->video->w, ref->video->h);
325 if ((ret = av_new_packet(pkt, size)) < 0)
328 memcpy(pict.data, ref->data, 4*sizeof(ref->data[0]));
329 memcpy(pict.linesize, ref->linesize, 4*sizeof(ref->linesize[0]));
331 avpicture_layout(&pict, ref->format, ref->video->w,
332 ref->video->h, pkt->data, size);
333 } else if (ref->audio) {
334 size = ref->audio->nb_samples *
335 av_get_bytes_per_sample(ref->format) *
336 av_get_channel_layout_nb_channels(ref->audio->channel_layout);
337 if ((ret = av_new_packet(pkt, size)) < 0)
339 memcpy(pkt->data, ref->data[0], size);
342 pkt->stream_index = stream_idx;
346 avfilter_unref_buffer(ref);
350 #define OFFSET(x) offsetof(LavfiContext, x)
352 #define DEC AV_OPT_FLAG_DECODING_PARAM
354 static const AVOption options[] = {
355 { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
356 { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
360 static const AVClass lavfi_class = {
361 .class_name = "lavfi indev",
362 .item_name = av_default_item_name,
364 .version = LIBAVUTIL_VERSION_INT,
367 AVInputFormat ff_lavfi_demuxer = {
369 .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
370 .priv_data_size = sizeof(LavfiContext),
371 .read_header = lavfi_read_header,
372 .read_packet = lavfi_read_packet,
373 .read_close = lavfi_read_close,
374 .flags = AVFMT_NOFILE,
375 .priv_class = &lavfi_class,