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/imgutils.h"
34 #include "libavutil/internal.h"
35 #include "libavutil/log.h"
36 #include "libavutil/mem.h"
37 #include "libavutil/opt.h"
38 #include "libavutil/parseutils.h"
39 #include "libavutil/pixdesc.h"
40 #include "libavfilter/avfilter.h"
41 #include "libavfilter/buffersink.h"
42 #include "libavformat/avio_internal.h"
43 #include "libavformat/internal.h"
47 AVClass *class; ///< class for private options
52 AVFilterContext **sinks;
56 int *sink_stream_subcc_map;
57 AVFrame *decoded_frame;
59 AVPacket subcc_packet;
62 static int *create_all_formats(int n)
64 int i, j, *fmts, count = 0;
66 for (i = 0; i < n; i++) {
67 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
68 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
72 if (!(fmts = av_malloc((count+1) * sizeof(int))))
74 for (j = 0, i = 0; i < n; i++) {
75 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
76 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
83 av_cold static int lavfi_read_close(AVFormatContext *avctx)
85 LavfiContext *lavfi = avctx->priv_data;
87 av_freep(&lavfi->sink_stream_map);
88 av_freep(&lavfi->sink_eof);
89 av_freep(&lavfi->stream_sink_map);
90 av_freep(&lavfi->sink_stream_subcc_map);
91 av_freep(&lavfi->sinks);
92 avfilter_graph_free(&lavfi->graph);
93 av_frame_free(&lavfi->decoded_frame);
98 static int create_subcc_streams(AVFormatContext *avctx)
100 LavfiContext *lavfi = avctx->priv_data;
102 int stream_idx, sink_idx;
104 for (stream_idx = 0; stream_idx < lavfi->nb_sinks; stream_idx++) {
105 sink_idx = lavfi->stream_sink_map[stream_idx];
106 if (lavfi->sink_stream_subcc_map[sink_idx]) {
107 lavfi->sink_stream_subcc_map[sink_idx] = avctx->nb_streams;
108 if (!(st = avformat_new_stream(avctx, NULL)))
109 return AVERROR(ENOMEM);
110 st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
111 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
113 lavfi->sink_stream_subcc_map[sink_idx] = -1;
119 av_cold static int lavfi_read_header(AVFormatContext *avctx)
121 LavfiContext *lavfi = avctx->priv_data;
122 AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
123 const AVFilter *buffersink, *abuffersink;
124 int *pix_fmts = create_all_formats(AV_PIX_FMT_NB);
125 enum AVMediaType type;
128 #define FAIL(ERR) { ret = ERR; goto end; }
131 FAIL(AVERROR(ENOMEM));
133 avfilter_register_all();
135 buffersink = avfilter_get_by_name("buffersink");
136 abuffersink = avfilter_get_by_name("abuffersink");
138 if (lavfi->graph_filename && lavfi->graph_str) {
139 av_log(avctx, AV_LOG_ERROR,
140 "Only one of the graph or graph_file options must be specified\n");
141 FAIL(AVERROR(EINVAL));
144 if (lavfi->graph_filename) {
145 AVBPrint graph_file_pb;
146 AVIOContext *avio = NULL;
147 AVDictionary *options = NULL;
148 if (avctx->protocol_whitelist && (ret = av_dict_set(&options, "protocol_whitelist", avctx->protocol_whitelist, 0)) < 0)
150 ret = avio_open2(&avio, lavfi->graph_filename, AVIO_FLAG_READ, &avctx->interrupt_callback, &options);
151 av_dict_set(&options, "protocol_whitelist", NULL, 0);
154 av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);
155 ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX);
157 av_bprint_chars(&graph_file_pb, '\0', 1);
158 if (!ret && !av_bprint_is_complete(&graph_file_pb))
159 ret = AVERROR(ENOMEM);
161 av_bprint_finalize(&graph_file_pb, NULL);
164 if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))
168 if (!lavfi->graph_str)
169 lavfi->graph_str = av_strdup(avctx->filename);
171 /* parse the graph, create a stream for each open output */
172 if (!(lavfi->graph = avfilter_graph_alloc()))
173 FAIL(AVERROR(ENOMEM));
175 if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,
176 &input_links, &output_links, avctx)) < 0)
180 av_log(avctx, AV_LOG_ERROR,
181 "Open inputs in the filtergraph are not acceptable\n");
182 FAIL(AVERROR(EINVAL));
185 /* count the outputs */
186 for (n = 0, inout = output_links; inout; n++, inout = inout->next);
189 if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
190 FAIL(AVERROR(ENOMEM));
191 if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
192 FAIL(AVERROR(ENOMEM));
193 if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
194 FAIL(AVERROR(ENOMEM));
195 if (!(lavfi->sink_stream_subcc_map = av_malloc(sizeof(int) * n)))
196 FAIL(AVERROR(ENOMEM));
198 for (i = 0; i < n; i++)
199 lavfi->stream_sink_map[i] = -1;
201 /* parse the output link names - they need to be of the form out0, out1, ...
202 * create a mapping between them and the streams */
203 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
204 int stream_idx = 0, suffix = 0, use_subcc = 0;
205 sscanf(inout->name, "out%n%d%n", &suffix, &stream_idx, &suffix);
207 av_log(avctx, AV_LOG_ERROR,
208 "Invalid outpad name '%s'\n", inout->name);
209 FAIL(AVERROR(EINVAL));
211 if (inout->name[suffix]) {
212 if (!strcmp(inout->name + suffix, "+subcc")) {
215 av_log(avctx, AV_LOG_ERROR,
216 "Invalid outpad suffix '%s'\n", inout->name);
217 FAIL(AVERROR(EINVAL));
221 if ((unsigned)stream_idx >= n) {
222 av_log(avctx, AV_LOG_ERROR,
223 "Invalid index was specified in output '%s', "
224 "must be a non-negative value < %d\n",
226 FAIL(AVERROR(EINVAL));
229 if (lavfi->stream_sink_map[stream_idx] != -1) {
230 av_log(avctx, AV_LOG_ERROR,
231 "An output with stream index %d was already specified\n",
233 FAIL(AVERROR(EINVAL));
235 lavfi->sink_stream_map[i] = stream_idx;
236 lavfi->stream_sink_map[stream_idx] = i;
237 lavfi->sink_stream_subcc_map[i] = !!use_subcc;
240 /* for each open output create a corresponding stream */
241 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
243 if (!(st = avformat_new_stream(avctx, NULL)))
244 FAIL(AVERROR(ENOMEM));
248 /* create a sink for each output and connect them to the graph */
249 lavfi->sinks = av_malloc_array(lavfi->nb_sinks, sizeof(AVFilterContext *));
251 FAIL(AVERROR(ENOMEM));
253 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
254 AVFilterContext *sink;
256 type = avfilter_pad_get_type(inout->filter_ctx->output_pads, inout->pad_idx);
258 if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
259 type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
260 av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
261 FAIL(AVERROR_FILTER_NOT_FOUND);
264 if (type == AVMEDIA_TYPE_VIDEO) {
265 ret = avfilter_graph_create_filter(&sink, buffersink,
269 ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
272 } else if (type == AVMEDIA_TYPE_AUDIO) {
273 enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8,
277 AV_SAMPLE_FMT_DBL, -1 };
279 ret = avfilter_graph_create_filter(&sink, abuffersink,
283 ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
286 ret = av_opt_set_int(sink, "all_channel_counts", 1,
287 AV_OPT_SEARCH_CHILDREN);
291 av_log(avctx, AV_LOG_ERROR,
292 "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
293 FAIL(AVERROR(EINVAL));
296 lavfi->sinks[i] = sink;
297 if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
301 /* configure the graph */
302 if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
305 if (lavfi->dump_graph) {
306 char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
312 /* fill each stream with the information in the corresponding sink */
313 for (i = 0; i < lavfi->nb_sinks; i++) {
314 AVFilterContext *sink = lavfi->sinks[lavfi->stream_sink_map[i]];
315 AVRational time_base = av_buffersink_get_time_base(sink);
316 AVStream *st = avctx->streams[i];
317 st->codecpar->codec_type = av_buffersink_get_type(sink);
318 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
319 if (av_buffersink_get_type(sink) == AVMEDIA_TYPE_VIDEO) {
320 st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
321 st->codecpar->format = av_buffersink_get_format(sink);
322 st->codecpar->width = av_buffersink_get_w(sink);
323 st->codecpar->height = av_buffersink_get_h(sink);
324 st ->sample_aspect_ratio =
325 st->codecpar->sample_aspect_ratio = av_buffersink_get_sample_aspect_ratio(sink);
326 avctx->probesize = FFMAX(avctx->probesize,
327 av_buffersink_get_w(sink) * av_buffersink_get_h(sink) *
328 av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(av_buffersink_get_format(sink))) *
330 } else if (av_buffersink_get_type(sink) == AVMEDIA_TYPE_AUDIO) {
331 st->codecpar->codec_id = av_get_pcm_codec(av_buffersink_get_format(sink), -1);
332 st->codecpar->channels = av_buffersink_get_channels(sink);
333 st->codecpar->format = av_buffersink_get_format(sink);
334 st->codecpar->sample_rate = av_buffersink_get_sample_rate(sink);
335 st->codecpar->channel_layout = av_buffersink_get_channel_layout(sink);
336 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
337 av_log(avctx, AV_LOG_ERROR,
338 "Could not find PCM codec for sample format %s.\n",
339 av_get_sample_fmt_name(av_buffersink_get_format(sink)));
343 if ((ret = create_subcc_streams(avctx)) < 0)
346 if (!(lavfi->decoded_frame = av_frame_alloc()))
347 FAIL(AVERROR(ENOMEM));
351 avfilter_inout_free(&input_links);
352 avfilter_inout_free(&output_links);
354 lavfi_read_close(avctx);
358 static int create_subcc_packet(AVFormatContext *avctx, AVFrame *frame,
361 LavfiContext *lavfi = avctx->priv_data;
363 int stream_idx, i, ret;
365 if ((stream_idx = lavfi->sink_stream_subcc_map[sink_idx]) < 0)
367 for (i = 0; i < frame->nb_side_data; i++)
368 if (frame->side_data[i]->type == AV_FRAME_DATA_A53_CC)
370 if (i >= frame->nb_side_data)
372 sd = frame->side_data[i];
373 if ((ret = av_new_packet(&lavfi->subcc_packet, sd->size)) < 0)
375 memcpy(lavfi->subcc_packet.data, sd->data, sd->size);
376 lavfi->subcc_packet.stream_index = stream_idx;
377 lavfi->subcc_packet.pts = frame->pts;
378 lavfi->subcc_packet.pos = frame->pkt_pos;
382 static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
384 LavfiContext *lavfi = avctx->priv_data;
385 double min_pts = DBL_MAX;
386 int stream_idx, min_pts_sink_idx = 0;
387 AVFrame *frame = lavfi->decoded_frame;
388 AVDictionary *frame_metadata;
392 if (lavfi->subcc_packet.size) {
393 *pkt = lavfi->subcc_packet;
394 av_init_packet(&lavfi->subcc_packet);
395 lavfi->subcc_packet.size = 0;
396 lavfi->subcc_packet.data = NULL;
400 /* iterate through all the graph sinks. Select the sink with the
402 for (i = 0; i < lavfi->nb_sinks; i++) {
403 AVRational tb = av_buffersink_get_time_base(lavfi->sinks[i]);
407 if (lavfi->sink_eof[i])
410 ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,
411 AV_BUFFERSINK_FLAG_PEEK);
412 if (ret == AVERROR_EOF) {
413 ff_dlog(avctx, "EOF sink_idx:%d\n", i);
414 lavfi->sink_eof[i] = 1;
418 d = av_rescale_q_rnd(frame->pts, tb, AV_TIME_BASE_Q, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
419 ff_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
420 av_frame_unref(frame);
424 min_pts_sink_idx = i;
427 if (min_pts == DBL_MAX)
430 ff_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
432 av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
433 stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
435 if (frame->width /* FIXME best way of testing a video */) {
436 size = av_image_get_buffer_size(frame->format, frame->width, frame->height, 1);
437 if ((ret = av_new_packet(pkt, size)) < 0)
440 av_image_copy_to_buffer(pkt->data, size, (const uint8_t **)frame->data, frame->linesize,
441 frame->format, frame->width, frame->height, 1);
442 } else if (frame->channels /* FIXME test audio */) {
443 size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
445 if ((ret = av_new_packet(pkt, size)) < 0)
447 memcpy(pkt->data, frame->data[0], size);
450 frame_metadata = frame->metadata;
451 if (frame_metadata) {
453 AVDictionaryEntry *e = NULL;
456 av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
457 while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
458 av_bprintf(&meta_buf, "%s", e->key);
459 av_bprint_chars(&meta_buf, '\0', 1);
460 av_bprintf(&meta_buf, "%s", e->value);
461 av_bprint_chars(&meta_buf, '\0', 1);
463 if (!av_bprint_is_complete(&meta_buf) ||
464 !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,
466 av_bprint_finalize(&meta_buf, NULL);
467 return AVERROR(ENOMEM);
469 memcpy(metadata, meta_buf.str, meta_buf.len);
470 av_bprint_finalize(&meta_buf, NULL);
473 if ((ret = create_subcc_packet(avctx, frame, min_pts_sink_idx)) < 0) {
474 av_frame_unref(frame);
475 av_packet_unref(pkt);
479 pkt->stream_index = stream_idx;
480 pkt->pts = frame->pts;
481 pkt->pos = frame->pkt_pos;
483 av_frame_unref(frame);
487 #define OFFSET(x) offsetof(LavfiContext, x)
489 #define DEC AV_OPT_FLAG_DECODING_PARAM
491 static const AVOption options[] = {
492 { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
493 { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
494 { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
498 static const AVClass lavfi_class = {
499 .class_name = "lavfi indev",
500 .item_name = av_default_item_name,
502 .version = LIBAVUTIL_VERSION_INT,
503 .category = AV_CLASS_CATEGORY_DEVICE_INPUT,
506 AVInputFormat ff_lavfi_demuxer = {
508 .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
509 .priv_data_size = sizeof(LavfiContext),
510 .read_header = lavfi_read_header,
511 .read_packet = lavfi_read_packet,
512 .read_close = lavfi_read_close,
513 .flags = AVFMT_NOFILE,
514 .priv_class = &lavfi_class,