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/bprint.h"
31 #include "libavutil/channel_layout.h"
32 #include "libavutil/file.h"
33 #include "libavutil/log.h"
34 #include "libavutil/mem.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/parseutils.h"
37 #include "libavutil/pixdesc.h"
38 #include "libavfilter/avfilter.h"
39 #include "libavfilter/avfiltergraph.h"
40 #include "libavfilter/buffersink.h"
41 #include "libavformat/internal.h"
45 AVClass *class; ///< class for private options
50 AVFilterContext **sinks;
56 static int *create_all_formats(int n)
58 int i, j, *fmts, count = 0;
60 for (i = 0; i < n; i++) {
61 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
62 if (!(desc->flags & PIX_FMT_HWACCEL))
66 if (!(fmts = av_malloc((count+1) * sizeof(int))))
68 for (j = 0, i = 0; i < n; i++) {
69 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
70 if (!(desc->flags & PIX_FMT_HWACCEL))
77 av_cold static int lavfi_read_close(AVFormatContext *avctx)
79 LavfiContext *lavfi = avctx->priv_data;
81 av_freep(&lavfi->sink_stream_map);
82 av_freep(&lavfi->sink_eof);
83 av_freep(&lavfi->stream_sink_map);
84 av_freep(&lavfi->sinks);
85 avfilter_graph_free(&lavfi->graph);
90 av_cold static int lavfi_read_header(AVFormatContext *avctx)
92 LavfiContext *lavfi = avctx->priv_data;
93 AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
94 AVFilter *buffersink, *abuffersink;
95 int *pix_fmts = create_all_formats(AV_PIX_FMT_NB);
96 enum AVMediaType type;
99 #define FAIL(ERR) { ret = ERR; goto end; }
102 FAIL(AVERROR(ENOMEM));
104 avfilter_register_all();
106 buffersink = avfilter_get_by_name("ffbuffersink");
107 abuffersink = avfilter_get_by_name("ffabuffersink");
109 if (lavfi->graph_filename && lavfi->graph_str) {
110 av_log(avctx, AV_LOG_ERROR,
111 "Only one of the graph or graph_file options must be specified\n");
112 FAIL(AVERROR(EINVAL));
115 if (lavfi->graph_filename) {
116 uint8_t *file_buf, *graph_buf;
118 ret = av_file_map(lavfi->graph_filename,
119 &file_buf, &file_bufsize, 0, avctx);
123 /* create a 0-terminated string based on the read file */
124 graph_buf = av_malloc(file_bufsize + 1);
126 av_file_unmap(file_buf, file_bufsize);
127 FAIL(AVERROR(ENOMEM));
129 memcpy(graph_buf, file_buf, file_bufsize);
130 graph_buf[file_bufsize] = 0;
131 av_file_unmap(file_buf, file_bufsize);
132 lavfi->graph_str = graph_buf;
135 if (!lavfi->graph_str)
136 lavfi->graph_str = av_strdup(avctx->filename);
138 /* parse the graph, create a stream for each open output */
139 if (!(lavfi->graph = avfilter_graph_alloc()))
140 FAIL(AVERROR(ENOMEM));
142 if ((ret = avfilter_graph_parse(lavfi->graph, lavfi->graph_str,
143 &input_links, &output_links, avctx)) < 0)
147 av_log(avctx, AV_LOG_ERROR,
148 "Open inputs in the filtergraph are not acceptable\n");
149 FAIL(AVERROR(EINVAL));
152 /* count the outputs */
153 for (n = 0, inout = output_links; inout; n++, inout = inout->next);
155 if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
156 FAIL(AVERROR(ENOMEM));
157 if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
158 FAIL(AVERROR(ENOMEM));
159 if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
160 FAIL(AVERROR(ENOMEM));
162 for (i = 0; i < n; i++)
163 lavfi->stream_sink_map[i] = -1;
165 /* parse the output link names - they need to be of the form out0, out1, ...
166 * create a mapping between them and the streams */
167 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
169 if (!strcmp(inout->name, "out"))
171 else if (sscanf(inout->name, "out%d\n", &stream_idx) != 1) {
172 av_log(avctx, AV_LOG_ERROR,
173 "Invalid outpad name '%s'\n", inout->name);
174 FAIL(AVERROR(EINVAL));
177 if ((unsigned)stream_idx >= n) {
178 av_log(avctx, AV_LOG_ERROR,
179 "Invalid index was specified in output '%s', "
180 "must be a non-negative value < %d\n",
182 FAIL(AVERROR(EINVAL));
185 /* is an audio or video output? */
186 type = inout->filter_ctx->output_pads[inout->pad_idx].type;
187 if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
188 av_log(avctx, AV_LOG_ERROR,
189 "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
190 FAIL(AVERROR(EINVAL));
193 if (lavfi->stream_sink_map[stream_idx] != -1) {
194 av_log(avctx, AV_LOG_ERROR,
195 "An output with stream index %d was already specified\n",
197 FAIL(AVERROR(EINVAL));
199 lavfi->sink_stream_map[i] = stream_idx;
200 lavfi->stream_sink_map[stream_idx] = i;
203 /* for each open output create a corresponding stream */
204 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
206 if (!(st = avformat_new_stream(avctx, NULL)))
207 FAIL(AVERROR(ENOMEM));
211 /* create a sink for each output and connect them to the graph */
212 lavfi->sinks = av_malloc(sizeof(AVFilterContext *) * avctx->nb_streams);
214 FAIL(AVERROR(ENOMEM));
216 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
217 AVFilterContext *sink;
219 type = inout->filter_ctx->output_pads[inout->pad_idx].type;
221 if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
222 type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
223 av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
224 FAIL(AVERROR_FILTER_NOT_FOUND);
227 if (type == AVMEDIA_TYPE_VIDEO) {
228 AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
230 buffersink_params->pixel_fmts = pix_fmts;
231 ret = avfilter_graph_create_filter(&sink, buffersink,
233 buffersink_params, lavfi->graph);
234 av_freep(&buffersink_params);
238 } else if (type == AVMEDIA_TYPE_AUDIO) {
239 enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8,
243 AV_SAMPLE_FMT_DBL, -1 };
244 AVABufferSinkParams *abuffersink_params = av_abuffersink_params_alloc();
245 abuffersink_params->sample_fmts = sample_fmts;
247 ret = avfilter_graph_create_filter(&sink, abuffersink,
249 abuffersink_params, lavfi->graph);
250 av_free(abuffersink_params);
255 lavfi->sinks[i] = sink;
256 if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
260 /* configure the graph */
261 if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
264 if (lavfi->dump_graph) {
265 char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
271 /* fill each stream with the information in the corresponding sink */
272 for (i = 0; i < avctx->nb_streams; i++) {
273 AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0];
274 AVStream *st = avctx->streams[i];
275 st->codec->codec_type = link->type;
276 avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den);
277 if (link->type == AVMEDIA_TYPE_VIDEO) {
278 st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
279 st->codec->pix_fmt = link->format;
280 st->codec->time_base = link->time_base;
281 st->codec->width = link->w;
282 st->codec->height = link->h;
283 st ->sample_aspect_ratio =
284 st->codec->sample_aspect_ratio = link->sample_aspect_ratio;
285 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
286 st->codec->codec_id = av_get_pcm_codec(link->format, -1);
287 st->codec->channels = av_get_channel_layout_nb_channels(link->channel_layout);
288 st->codec->sample_fmt = link->format;
289 st->codec->sample_rate = link->sample_rate;
290 st->codec->time_base = link->time_base;
291 st->codec->channel_layout = link->channel_layout;
292 if (st->codec->codec_id == AV_CODEC_ID_NONE)
293 av_log(avctx, AV_LOG_ERROR,
294 "Could not find PCM codec for sample format %s.\n",
295 av_get_sample_fmt_name(link->format));
301 avfilter_inout_free(&input_links);
302 avfilter_inout_free(&output_links);
304 lavfi_read_close(avctx);
308 static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
310 LavfiContext *lavfi = avctx->priv_data;
311 double min_pts = DBL_MAX;
312 int stream_idx, min_pts_sink_idx = 0;
313 AVFilterBufferRef *ref;
318 /* iterate through all the graph sinks. Select the sink with the
320 for (i = 0; i < avctx->nb_streams; i++) {
321 AVRational tb = lavfi->sinks[i]->inputs[0]->time_base;
325 if (lavfi->sink_eof[i])
328 ret = av_buffersink_get_buffer_ref(lavfi->sinks[i],
329 &ref, AV_BUFFERSINK_FLAG_PEEK);
330 if (ret == AVERROR_EOF) {
331 av_dlog(avctx, "EOF sink_idx:%d\n", i);
332 lavfi->sink_eof[i] = 1;
336 d = av_rescale_q(ref->pts, tb, AV_TIME_BASE_Q);
337 av_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
341 min_pts_sink_idx = i;
344 if (min_pts == DBL_MAX)
347 av_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
349 av_buffersink_get_buffer_ref(lavfi->sinks[min_pts_sink_idx], &ref, 0);
350 stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
353 size = avpicture_get_size(ref->format, ref->video->w, ref->video->h);
354 if ((ret = av_new_packet(pkt, size)) < 0)
357 memcpy(pict.data, ref->data, 4*sizeof(ref->data[0]));
358 memcpy(pict.linesize, ref->linesize, 4*sizeof(ref->linesize[0]));
360 avpicture_layout(&pict, ref->format, ref->video->w,
361 ref->video->h, pkt->data, size);
362 } else if (ref->audio) {
363 size = ref->audio->nb_samples *
364 av_get_bytes_per_sample(ref->format) *
365 av_get_channel_layout_nb_channels(ref->audio->channel_layout);
366 if ((ret = av_new_packet(pkt, size)) < 0)
368 memcpy(pkt->data, ref->data[0], size);
373 AVDictionaryEntry *e = NULL;
376 av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
377 while ((e = av_dict_get(ref->metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
378 av_bprintf(&meta_buf, "%s", e->key);
379 av_bprint_chars(&meta_buf, '\0', 1);
380 av_bprintf(&meta_buf, "%s", e->value);
381 av_bprint_chars(&meta_buf, '\0', 1);
383 if (!av_bprint_is_complete(&meta_buf) ||
384 !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,
386 av_bprint_finalize(&meta_buf, NULL);
387 return AVERROR(ENOMEM);
389 memcpy(metadata, meta_buf.str, meta_buf.len);
390 av_bprint_finalize(&meta_buf, NULL);
393 pkt->stream_index = stream_idx;
397 avfilter_unref_buffer(ref);
401 #define OFFSET(x) offsetof(LavfiContext, x)
403 #define DEC AV_OPT_FLAG_DECODING_PARAM
405 static const AVOption options[] = {
406 { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
407 { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
408 { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
412 static const AVClass lavfi_class = {
413 .class_name = "lavfi indev",
414 .item_name = av_default_item_name,
416 .version = LIBAVUTIL_VERSION_INT,
419 AVInputFormat ff_lavfi_demuxer = {
421 .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
422 .priv_data_size = sizeof(LavfiContext),
423 .read_header = lavfi_read_header,
424 .read_packet = lavfi_read_packet,
425 .read_close = lavfi_read_close,
426 .flags = AVFMT_NOFILE,
427 .priv_class = &lavfi_class,