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;
54 AVFrame *decoded_frame;
57 static int *create_all_formats(int n)
59 int i, j, *fmts, count = 0;
61 for (i = 0; i < n; i++) {
62 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
63 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
67 if (!(fmts = av_malloc((count+1) * sizeof(int))))
69 for (j = 0, i = 0; i < n; i++) {
70 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
71 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
78 av_cold static int lavfi_read_close(AVFormatContext *avctx)
80 LavfiContext *lavfi = avctx->priv_data;
82 av_freep(&lavfi->sink_stream_map);
83 av_freep(&lavfi->sink_eof);
84 av_freep(&lavfi->stream_sink_map);
85 av_freep(&lavfi->sinks);
86 avfilter_graph_free(&lavfi->graph);
87 av_frame_free(&lavfi->decoded_frame);
92 av_cold static int lavfi_read_header(AVFormatContext *avctx)
94 LavfiContext *lavfi = avctx->priv_data;
95 AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
96 AVFilter *buffersink, *abuffersink;
97 int *pix_fmts = create_all_formats(AV_PIX_FMT_NB);
98 enum AVMediaType type;
101 #define FAIL(ERR) { ret = ERR; goto end; }
104 FAIL(AVERROR(ENOMEM));
106 avfilter_register_all();
108 buffersink = avfilter_get_by_name("buffersink");
109 abuffersink = avfilter_get_by_name("abuffersink");
111 if (lavfi->graph_filename && lavfi->graph_str) {
112 av_log(avctx, AV_LOG_ERROR,
113 "Only one of the graph or graph_file options must be specified\n");
114 FAIL(AVERROR(EINVAL));
117 if (lavfi->graph_filename) {
118 uint8_t *file_buf, *graph_buf;
120 ret = av_file_map(lavfi->graph_filename,
121 &file_buf, &file_bufsize, 0, avctx);
125 /* create a 0-terminated string based on the read file */
126 graph_buf = av_malloc(file_bufsize + 1);
128 av_file_unmap(file_buf, file_bufsize);
129 FAIL(AVERROR(ENOMEM));
131 memcpy(graph_buf, file_buf, file_bufsize);
132 graph_buf[file_bufsize] = 0;
133 av_file_unmap(file_buf, file_bufsize);
134 lavfi->graph_str = graph_buf;
137 if (!lavfi->graph_str)
138 lavfi->graph_str = av_strdup(avctx->filename);
140 /* parse the graph, create a stream for each open output */
141 if (!(lavfi->graph = avfilter_graph_alloc()))
142 FAIL(AVERROR(ENOMEM));
144 if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,
145 &input_links, &output_links, avctx)) < 0)
149 av_log(avctx, AV_LOG_ERROR,
150 "Open inputs in the filtergraph are not acceptable\n");
151 FAIL(AVERROR(EINVAL));
154 /* count the outputs */
155 for (n = 0, inout = output_links; inout; n++, inout = inout->next);
157 if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
158 FAIL(AVERROR(ENOMEM));
159 if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
160 FAIL(AVERROR(ENOMEM));
161 if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
162 FAIL(AVERROR(ENOMEM));
164 for (i = 0; i < n; i++)
165 lavfi->stream_sink_map[i] = -1;
167 /* parse the output link names - they need to be of the form out0, out1, ...
168 * create a mapping between them and the streams */
169 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
171 if (!strcmp(inout->name, "out"))
173 else if (sscanf(inout->name, "out%d\n", &stream_idx) != 1) {
174 av_log(avctx, AV_LOG_ERROR,
175 "Invalid outpad name '%s'\n", inout->name);
176 FAIL(AVERROR(EINVAL));
179 if ((unsigned)stream_idx >= n) {
180 av_log(avctx, AV_LOG_ERROR,
181 "Invalid index was specified in output '%s', "
182 "must be a non-negative value < %d\n",
184 FAIL(AVERROR(EINVAL));
187 /* is an audio or video output? */
188 type = inout->filter_ctx->output_pads[inout->pad_idx].type;
189 if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
190 av_log(avctx, AV_LOG_ERROR,
191 "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
192 FAIL(AVERROR(EINVAL));
195 if (lavfi->stream_sink_map[stream_idx] != -1) {
196 av_log(avctx, AV_LOG_ERROR,
197 "An output with stream index %d was already specified\n",
199 FAIL(AVERROR(EINVAL));
201 lavfi->sink_stream_map[i] = stream_idx;
202 lavfi->stream_sink_map[stream_idx] = i;
205 /* for each open output create a corresponding stream */
206 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
208 if (!(st = avformat_new_stream(avctx, NULL)))
209 FAIL(AVERROR(ENOMEM));
213 /* create a sink for each output and connect them to the graph */
214 lavfi->sinks = av_malloc(sizeof(AVFilterContext *) * avctx->nb_streams);
216 FAIL(AVERROR(ENOMEM));
218 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
219 AVFilterContext *sink;
221 type = inout->filter_ctx->output_pads[inout->pad_idx].type;
223 if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
224 type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
225 av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
226 FAIL(AVERROR_FILTER_NOT_FOUND);
229 if (type == AVMEDIA_TYPE_VIDEO) {
230 ret = avfilter_graph_create_filter(&sink, buffersink,
234 ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
237 } else if (type == AVMEDIA_TYPE_AUDIO) {
238 enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8,
242 AV_SAMPLE_FMT_DBL, -1 };
244 ret = avfilter_graph_create_filter(&sink, abuffersink,
248 ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
251 ret = av_opt_set_int(sink, "all_channel_counts", 1,
252 AV_OPT_SEARCH_CHILDREN);
257 lavfi->sinks[i] = sink;
258 if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
262 /* configure the graph */
263 if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
266 if (lavfi->dump_graph) {
267 char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
273 /* fill each stream with the information in the corresponding sink */
274 for (i = 0; i < avctx->nb_streams; i++) {
275 AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0];
276 AVStream *st = avctx->streams[i];
277 st->codec->codec_type = link->type;
278 avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den);
279 if (link->type == AVMEDIA_TYPE_VIDEO) {
280 st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
281 st->codec->pix_fmt = link->format;
282 st->codec->time_base = link->time_base;
283 st->codec->width = link->w;
284 st->codec->height = link->h;
285 st ->sample_aspect_ratio =
286 st->codec->sample_aspect_ratio = link->sample_aspect_ratio;
287 avctx->probesize = FFMAX(avctx->probesize,
289 av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(link->format)) *
291 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
292 st->codec->codec_id = av_get_pcm_codec(link->format, -1);
293 st->codec->channels = avfilter_link_get_channels(link);
294 st->codec->sample_fmt = link->format;
295 st->codec->sample_rate = link->sample_rate;
296 st->codec->time_base = link->time_base;
297 st->codec->channel_layout = link->channel_layout;
298 if (st->codec->codec_id == AV_CODEC_ID_NONE)
299 av_log(avctx, AV_LOG_ERROR,
300 "Could not find PCM codec for sample format %s.\n",
301 av_get_sample_fmt_name(link->format));
305 if (!(lavfi->decoded_frame = av_frame_alloc()))
306 FAIL(AVERROR(ENOMEM));
310 avfilter_inout_free(&input_links);
311 avfilter_inout_free(&output_links);
313 lavfi_read_close(avctx);
317 static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
319 LavfiContext *lavfi = avctx->priv_data;
320 double min_pts = DBL_MAX;
321 int stream_idx, min_pts_sink_idx = 0;
322 AVFrame *frame = lavfi->decoded_frame;
324 AVDictionary *frame_metadata;
328 /* iterate through all the graph sinks. Select the sink with the
330 for (i = 0; i < avctx->nb_streams; i++) {
331 AVRational tb = lavfi->sinks[i]->inputs[0]->time_base;
335 if (lavfi->sink_eof[i])
338 ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,
339 AV_BUFFERSINK_FLAG_PEEK);
340 if (ret == AVERROR_EOF) {
341 av_dlog(avctx, "EOF sink_idx:%d\n", i);
342 lavfi->sink_eof[i] = 1;
346 d = av_rescale_q(frame->pts, tb, AV_TIME_BASE_Q);
347 av_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
348 av_frame_unref(frame);
352 min_pts_sink_idx = i;
355 if (min_pts == DBL_MAX)
358 av_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
360 av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
361 stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
363 if (frame->width /* FIXME best way of testing a video */) {
364 size = avpicture_get_size(frame->format, frame->width, frame->height);
365 if ((ret = av_new_packet(pkt, size)) < 0)
368 memcpy(pict.data, frame->data, 4*sizeof(frame->data[0]));
369 memcpy(pict.linesize, frame->linesize, 4*sizeof(frame->linesize[0]));
371 avpicture_layout(&pict, frame->format, frame->width, frame->height,
373 } else if (av_frame_get_channels(frame) /* FIXME test audio */) {
374 size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
375 av_frame_get_channels(frame);
376 if ((ret = av_new_packet(pkt, size)) < 0)
378 memcpy(pkt->data, frame->data[0], size);
381 frame_metadata = av_frame_get_metadata(frame);
382 if (frame_metadata) {
384 AVDictionaryEntry *e = NULL;
387 av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
388 while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
389 av_bprintf(&meta_buf, "%s", e->key);
390 av_bprint_chars(&meta_buf, '\0', 1);
391 av_bprintf(&meta_buf, "%s", e->value);
392 av_bprint_chars(&meta_buf, '\0', 1);
394 if (!av_bprint_is_complete(&meta_buf) ||
395 !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,
397 av_bprint_finalize(&meta_buf, NULL);
398 return AVERROR(ENOMEM);
400 memcpy(metadata, meta_buf.str, meta_buf.len);
401 av_bprint_finalize(&meta_buf, NULL);
404 pkt->stream_index = stream_idx;
405 pkt->pts = frame->pts;
406 pkt->pos = av_frame_get_pkt_pos(frame);
408 av_frame_unref(frame);
412 #define OFFSET(x) offsetof(LavfiContext, x)
414 #define DEC AV_OPT_FLAG_DECODING_PARAM
416 static const AVOption options[] = {
417 { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
418 { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
419 { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
423 static const AVClass lavfi_class = {
424 .class_name = "lavfi indev",
425 .item_name = av_default_item_name,
427 .version = LIBAVUTIL_VERSION_INT,
430 AVInputFormat ff_lavfi_demuxer = {
432 .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
433 .priv_data_size = sizeof(LavfiContext),
434 .read_header = lavfi_read_header,
435 .read_packet = lavfi_read_packet,
436 .read_close = lavfi_read_close,
437 .flags = AVFMT_NOFILE,
438 .priv_class = &lavfi_class,