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 int *sink_stream_subcc_map;
55 AVFrame *decoded_frame;
57 AVPacket subcc_packet;
60 static int *create_all_formats(int n)
62 int i, j, *fmts, count = 0;
64 for (i = 0; i < n; i++) {
65 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
66 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
70 if (!(fmts = av_malloc((count+1) * sizeof(int))))
72 for (j = 0, i = 0; i < n; i++) {
73 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
74 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
81 av_cold static int lavfi_read_close(AVFormatContext *avctx)
83 LavfiContext *lavfi = avctx->priv_data;
85 av_freep(&lavfi->sink_stream_map);
86 av_freep(&lavfi->sink_eof);
87 av_freep(&lavfi->stream_sink_map);
88 av_freep(&lavfi->sink_stream_subcc_map);
89 av_freep(&lavfi->sinks);
90 avfilter_graph_free(&lavfi->graph);
91 av_frame_free(&lavfi->decoded_frame);
96 static int create_subcc_streams(AVFormatContext *avctx)
98 LavfiContext *lavfi = avctx->priv_data;
100 int stream_idx, sink_idx;
102 for (stream_idx = 0; stream_idx < lavfi->nb_sinks; stream_idx++) {
103 sink_idx = lavfi->stream_sink_map[stream_idx];
104 if (lavfi->sink_stream_subcc_map[sink_idx]) {
105 lavfi->sink_stream_subcc_map[sink_idx] = avctx->nb_streams;
106 if (!(st = avformat_new_stream(avctx, NULL)))
107 return AVERROR(ENOMEM);
108 st->codec->codec_id = AV_CODEC_ID_EIA_608;
109 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
111 lavfi->sink_stream_subcc_map[sink_idx] = -1;
117 av_cold static int lavfi_read_header(AVFormatContext *avctx)
119 LavfiContext *lavfi = avctx->priv_data;
120 AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
121 AVFilter *buffersink, *abuffersink;
122 int *pix_fmts = create_all_formats(AV_PIX_FMT_NB);
123 enum AVMediaType type;
126 #define FAIL(ERR) { ret = ERR; goto end; }
129 FAIL(AVERROR(ENOMEM));
131 avfilter_register_all();
133 buffersink = avfilter_get_by_name("buffersink");
134 abuffersink = avfilter_get_by_name("abuffersink");
136 if (lavfi->graph_filename && lavfi->graph_str) {
137 av_log(avctx, AV_LOG_ERROR,
138 "Only one of the graph or graph_file options must be specified\n");
139 FAIL(AVERROR(EINVAL));
142 if (lavfi->graph_filename) {
143 AVBPrint graph_file_pb;
144 AVIOContext *avio = NULL;
145 ret = avio_open(&avio, lavfi->graph_filename, AVIO_FLAG_READ);
148 av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);
149 ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX);
151 av_bprint_chars(&graph_file_pb, '\0', 1);
152 if (!ret && !av_bprint_is_complete(&graph_file_pb))
153 ret = AVERROR(ENOMEM);
155 av_bprint_finalize(&graph_file_pb, NULL);
158 if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))
162 if (!lavfi->graph_str)
163 lavfi->graph_str = av_strdup(avctx->filename);
165 /* parse the graph, create a stream for each open output */
166 if (!(lavfi->graph = avfilter_graph_alloc()))
167 FAIL(AVERROR(ENOMEM));
169 if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,
170 &input_links, &output_links, avctx)) < 0)
174 av_log(avctx, AV_LOG_ERROR,
175 "Open inputs in the filtergraph are not acceptable\n");
176 FAIL(AVERROR(EINVAL));
179 /* count the outputs */
180 for (n = 0, inout = output_links; inout; n++, inout = inout->next);
183 if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
184 FAIL(AVERROR(ENOMEM));
185 if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
186 FAIL(AVERROR(ENOMEM));
187 if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
188 FAIL(AVERROR(ENOMEM));
189 if (!(lavfi->sink_stream_subcc_map = av_malloc(sizeof(int) * n)))
190 FAIL(AVERROR(ENOMEM));
192 for (i = 0; i < n; i++)
193 lavfi->stream_sink_map[i] = -1;
195 /* parse the output link names - they need to be of the form out0, out1, ...
196 * create a mapping between them and the streams */
197 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
198 int stream_idx = 0, suffix = 0, use_subcc = 0;
199 sscanf(inout->name, "out%n%d%n", &suffix, &stream_idx, &suffix);
201 av_log(avctx, AV_LOG_ERROR,
202 "Invalid outpad name '%s'\n", inout->name);
203 FAIL(AVERROR(EINVAL));
205 if (inout->name[suffix]) {
206 if (!strcmp(inout->name + suffix, "+subcc")) {
209 av_log(avctx, AV_LOG_ERROR,
210 "Invalid outpad suffix '%s'\n", inout->name);
211 FAIL(AVERROR(EINVAL));
215 if ((unsigned)stream_idx >= n) {
216 av_log(avctx, AV_LOG_ERROR,
217 "Invalid index was specified in output '%s', "
218 "must be a non-negative value < %d\n",
220 FAIL(AVERROR(EINVAL));
223 if (lavfi->stream_sink_map[stream_idx] != -1) {
224 av_log(avctx, AV_LOG_ERROR,
225 "An output with stream index %d was already specified\n",
227 FAIL(AVERROR(EINVAL));
229 lavfi->sink_stream_map[i] = stream_idx;
230 lavfi->stream_sink_map[stream_idx] = i;
231 lavfi->sink_stream_subcc_map[i] = !!use_subcc;
234 /* for each open output create a corresponding stream */
235 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
237 if (!(st = avformat_new_stream(avctx, NULL)))
238 FAIL(AVERROR(ENOMEM));
242 /* create a sink for each output and connect them to the graph */
243 lavfi->sinks = av_malloc_array(lavfi->nb_sinks, sizeof(AVFilterContext *));
245 FAIL(AVERROR(ENOMEM));
247 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
248 AVFilterContext *sink;
250 type = inout->filter_ctx->output_pads[inout->pad_idx].type;
252 if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
253 type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
254 av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
255 FAIL(AVERROR_FILTER_NOT_FOUND);
258 if (type == AVMEDIA_TYPE_VIDEO) {
259 ret = avfilter_graph_create_filter(&sink, buffersink,
263 ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
266 } else if (type == AVMEDIA_TYPE_AUDIO) {
267 enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8,
271 AV_SAMPLE_FMT_DBL, -1 };
273 ret = avfilter_graph_create_filter(&sink, abuffersink,
277 ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
280 ret = av_opt_set_int(sink, "all_channel_counts", 1,
281 AV_OPT_SEARCH_CHILDREN);
285 av_log(avctx, AV_LOG_ERROR,
286 "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
287 FAIL(AVERROR(EINVAL));
290 lavfi->sinks[i] = sink;
291 if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
295 /* configure the graph */
296 if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
299 if (lavfi->dump_graph) {
300 char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
306 /* fill each stream with the information in the corresponding sink */
307 for (i = 0; i < lavfi->nb_sinks; i++) {
308 AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0];
309 AVStream *st = avctx->streams[i];
310 st->codec->codec_type = link->type;
311 avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den);
312 if (link->type == AVMEDIA_TYPE_VIDEO) {
313 st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
314 st->codec->pix_fmt = link->format;
315 st->codec->time_base = link->time_base;
316 st->codec->width = link->w;
317 st->codec->height = link->h;
318 st ->sample_aspect_ratio =
319 st->codec->sample_aspect_ratio = link->sample_aspect_ratio;
320 avctx->probesize = FFMAX(avctx->probesize,
322 av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(link->format)) *
324 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
325 st->codec->codec_id = av_get_pcm_codec(link->format, -1);
326 st->codec->channels = avfilter_link_get_channels(link);
327 st->codec->sample_fmt = link->format;
328 st->codec->sample_rate = link->sample_rate;
329 st->codec->time_base = link->time_base;
330 st->codec->channel_layout = link->channel_layout;
331 if (st->codec->codec_id == AV_CODEC_ID_NONE)
332 av_log(avctx, AV_LOG_ERROR,
333 "Could not find PCM codec for sample format %s.\n",
334 av_get_sample_fmt_name(link->format));
338 if ((ret = create_subcc_streams(avctx)) < 0)
341 if (!(lavfi->decoded_frame = av_frame_alloc()))
342 FAIL(AVERROR(ENOMEM));
346 avfilter_inout_free(&input_links);
347 avfilter_inout_free(&output_links);
349 lavfi_read_close(avctx);
353 static int create_subcc_packet(AVFormatContext *avctx, AVFrame *frame,
356 LavfiContext *lavfi = avctx->priv_data;
358 int stream_idx, i, ret;
360 if ((stream_idx = lavfi->sink_stream_subcc_map[sink_idx]) < 0)
362 for (i = 0; i < frame->nb_side_data; i++)
363 if (frame->side_data[i]->type == AV_FRAME_DATA_A53_CC)
365 if (i >= frame->nb_side_data)
367 sd = frame->side_data[i];
368 if ((ret = av_new_packet(&lavfi->subcc_packet, sd->size)) < 0)
370 memcpy(lavfi->subcc_packet.data, sd->data, sd->size);
371 lavfi->subcc_packet.stream_index = stream_idx;
372 lavfi->subcc_packet.pts = frame->pts;
373 lavfi->subcc_packet.pos = av_frame_get_pkt_pos(frame);
377 static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
379 LavfiContext *lavfi = avctx->priv_data;
380 double min_pts = DBL_MAX;
381 int stream_idx, min_pts_sink_idx = 0;
382 AVFrame *frame = lavfi->decoded_frame;
384 AVDictionary *frame_metadata;
388 if (lavfi->subcc_packet.size) {
389 *pkt = lavfi->subcc_packet;
390 av_init_packet(&lavfi->subcc_packet);
391 lavfi->subcc_packet.size = 0;
392 lavfi->subcc_packet.data = NULL;
396 /* iterate through all the graph sinks. Select the sink with the
398 for (i = 0; i < lavfi->nb_sinks; i++) {
399 AVRational tb = lavfi->sinks[i]->inputs[0]->time_base;
403 if (lavfi->sink_eof[i])
406 ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,
407 AV_BUFFERSINK_FLAG_PEEK);
408 if (ret == AVERROR_EOF) {
409 av_dlog(avctx, "EOF sink_idx:%d\n", i);
410 lavfi->sink_eof[i] = 1;
414 d = av_rescale_q(frame->pts, tb, AV_TIME_BASE_Q);
415 av_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
416 av_frame_unref(frame);
420 min_pts_sink_idx = i;
423 if (min_pts == DBL_MAX)
426 av_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
428 av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
429 stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
431 if (frame->width /* FIXME best way of testing a video */) {
432 size = avpicture_get_size(frame->format, frame->width, frame->height);
433 if ((ret = av_new_packet(pkt, size)) < 0)
436 memcpy(pict.data, frame->data, 4*sizeof(frame->data[0]));
437 memcpy(pict.linesize, frame->linesize, 4*sizeof(frame->linesize[0]));
439 avpicture_layout(&pict, frame->format, frame->width, frame->height,
441 } else if (av_frame_get_channels(frame) /* FIXME test audio */) {
442 size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
443 av_frame_get_channels(frame);
444 if ((ret = av_new_packet(pkt, size)) < 0)
446 memcpy(pkt->data, frame->data[0], size);
449 frame_metadata = av_frame_get_metadata(frame);
450 if (frame_metadata) {
452 AVDictionaryEntry *e = NULL;
455 av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
456 while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
457 av_bprintf(&meta_buf, "%s", e->key);
458 av_bprint_chars(&meta_buf, '\0', 1);
459 av_bprintf(&meta_buf, "%s", e->value);
460 av_bprint_chars(&meta_buf, '\0', 1);
462 if (!av_bprint_is_complete(&meta_buf) ||
463 !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,
465 av_bprint_finalize(&meta_buf, NULL);
466 return AVERROR(ENOMEM);
468 memcpy(metadata, meta_buf.str, meta_buf.len);
469 av_bprint_finalize(&meta_buf, NULL);
472 if ((ret = create_subcc_packet(avctx, frame, min_pts_sink_idx)) < 0) {
473 av_frame_unref(frame);
474 av_packet_unref(pkt);
478 pkt->stream_index = stream_idx;
479 pkt->pts = frame->pts;
480 pkt->pos = av_frame_get_pkt_pos(frame);
482 av_frame_unref(frame);
486 #define OFFSET(x) offsetof(LavfiContext, x)
488 #define DEC AV_OPT_FLAG_DECODING_PARAM
490 static const AVOption options[] = {
491 { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
492 { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
493 { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
497 static const AVClass lavfi_class = {
498 .class_name = "lavfi indev",
499 .item_name = av_default_item_name,
501 .version = LIBAVUTIL_VERSION_INT,
502 .category = AV_CLASS_CATEGORY_DEVICE_INPUT,
505 AVInputFormat ff_lavfi_demuxer = {
507 .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
508 .priv_data_size = sizeof(LavfiContext),
509 .read_header = lavfi_read_header,
510 .read_packet = lavfi_read_packet,
511 .read_close = lavfi_read_close,
512 .flags = AVFMT_NOFILE,
513 .priv_class = &lavfi_class,