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/avfiltergraph.h"
42 #include "libavfilter/buffersink.h"
43 #include "libavformat/avio_internal.h"
44 #include "libavformat/internal.h"
48 AVClass *class; ///< class for private options
53 AVFilterContext **sinks;
57 int *sink_stream_subcc_map;
58 AVFrame *decoded_frame;
60 AVPacket subcc_packet;
63 static int *create_all_formats(int n)
65 int i, j, *fmts, count = 0;
67 for (i = 0; i < n; i++) {
68 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
69 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
73 if (!(fmts = av_malloc((count+1) * sizeof(int))))
75 for (j = 0, i = 0; i < n; i++) {
76 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
77 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
84 av_cold static int lavfi_read_close(AVFormatContext *avctx)
86 LavfiContext *lavfi = avctx->priv_data;
88 av_freep(&lavfi->sink_stream_map);
89 av_freep(&lavfi->sink_eof);
90 av_freep(&lavfi->stream_sink_map);
91 av_freep(&lavfi->sink_stream_subcc_map);
92 av_freep(&lavfi->sinks);
93 avfilter_graph_free(&lavfi->graph);
94 av_frame_free(&lavfi->decoded_frame);
99 static int create_subcc_streams(AVFormatContext *avctx)
101 LavfiContext *lavfi = avctx->priv_data;
103 int stream_idx, sink_idx;
105 for (stream_idx = 0; stream_idx < lavfi->nb_sinks; stream_idx++) {
106 sink_idx = lavfi->stream_sink_map[stream_idx];
107 if (lavfi->sink_stream_subcc_map[sink_idx]) {
108 lavfi->sink_stream_subcc_map[sink_idx] = avctx->nb_streams;
109 if (!(st = avformat_new_stream(avctx, NULL)))
110 return AVERROR(ENOMEM);
111 st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
112 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
114 lavfi->sink_stream_subcc_map[sink_idx] = -1;
120 av_cold static int lavfi_read_header(AVFormatContext *avctx)
122 LavfiContext *lavfi = avctx->priv_data;
123 AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
124 AVFilter *buffersink, *abuffersink;
125 int *pix_fmts = create_all_formats(AV_PIX_FMT_NB);
126 enum AVMediaType type;
129 #define FAIL(ERR) { ret = ERR; goto end; }
132 FAIL(AVERROR(ENOMEM));
134 avfilter_register_all();
136 buffersink = avfilter_get_by_name("buffersink");
137 abuffersink = avfilter_get_by_name("abuffersink");
139 if (lavfi->graph_filename && lavfi->graph_str) {
140 av_log(avctx, AV_LOG_ERROR,
141 "Only one of the graph or graph_file options must be specified\n");
142 FAIL(AVERROR(EINVAL));
145 if (lavfi->graph_filename) {
146 AVBPrint graph_file_pb;
147 AVIOContext *avio = NULL;
148 AVDictionary *options = NULL;
149 if (avctx->protocol_whitelist && (ret = av_dict_set(&options, "protocol_whitelist", avctx->protocol_whitelist, 0)) < 0)
151 ret = avio_open2(&avio, lavfi->graph_filename, AVIO_FLAG_READ, &avctx->interrupt_callback, &options);
152 av_dict_set(&options, "protocol_whitelist", NULL, 0);
155 av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);
156 ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX);
158 av_bprint_chars(&graph_file_pb, '\0', 1);
159 if (!ret && !av_bprint_is_complete(&graph_file_pb))
160 ret = AVERROR(ENOMEM);
162 av_bprint_finalize(&graph_file_pb, NULL);
165 if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))
169 if (!lavfi->graph_str)
170 lavfi->graph_str = av_strdup(avctx->filename);
172 /* parse the graph, create a stream for each open output */
173 if (!(lavfi->graph = avfilter_graph_alloc()))
174 FAIL(AVERROR(ENOMEM));
176 if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,
177 &input_links, &output_links, avctx)) < 0)
181 av_log(avctx, AV_LOG_ERROR,
182 "Open inputs in the filtergraph are not acceptable\n");
183 FAIL(AVERROR(EINVAL));
186 /* count the outputs */
187 for (n = 0, inout = output_links; inout; n++, inout = inout->next);
190 if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
191 FAIL(AVERROR(ENOMEM));
192 if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
193 FAIL(AVERROR(ENOMEM));
194 if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
195 FAIL(AVERROR(ENOMEM));
196 if (!(lavfi->sink_stream_subcc_map = av_malloc(sizeof(int) * n)))
197 FAIL(AVERROR(ENOMEM));
199 for (i = 0; i < n; i++)
200 lavfi->stream_sink_map[i] = -1;
202 /* parse the output link names - they need to be of the form out0, out1, ...
203 * create a mapping between them and the streams */
204 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
205 int stream_idx = 0, suffix = 0, use_subcc = 0;
206 sscanf(inout->name, "out%n%d%n", &suffix, &stream_idx, &suffix);
208 av_log(avctx, AV_LOG_ERROR,
209 "Invalid outpad name '%s'\n", inout->name);
210 FAIL(AVERROR(EINVAL));
212 if (inout->name[suffix]) {
213 if (!strcmp(inout->name + suffix, "+subcc")) {
216 av_log(avctx, AV_LOG_ERROR,
217 "Invalid outpad suffix '%s'\n", inout->name);
218 FAIL(AVERROR(EINVAL));
222 if ((unsigned)stream_idx >= n) {
223 av_log(avctx, AV_LOG_ERROR,
224 "Invalid index was specified in output '%s', "
225 "must be a non-negative value < %d\n",
227 FAIL(AVERROR(EINVAL));
230 if (lavfi->stream_sink_map[stream_idx] != -1) {
231 av_log(avctx, AV_LOG_ERROR,
232 "An output with stream index %d was already specified\n",
234 FAIL(AVERROR(EINVAL));
236 lavfi->sink_stream_map[i] = stream_idx;
237 lavfi->stream_sink_map[stream_idx] = i;
238 lavfi->sink_stream_subcc_map[i] = !!use_subcc;
241 /* for each open output create a corresponding stream */
242 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
244 if (!(st = avformat_new_stream(avctx, NULL)))
245 FAIL(AVERROR(ENOMEM));
249 /* create a sink for each output and connect them to the graph */
250 lavfi->sinks = av_malloc_array(lavfi->nb_sinks, sizeof(AVFilterContext *));
252 FAIL(AVERROR(ENOMEM));
254 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
255 AVFilterContext *sink;
257 type = avfilter_pad_get_type(inout->filter_ctx->output_pads, inout->pad_idx);
259 if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
260 type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
261 av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
262 FAIL(AVERROR_FILTER_NOT_FOUND);
265 if (type == AVMEDIA_TYPE_VIDEO) {
266 ret = avfilter_graph_create_filter(&sink, buffersink,
270 ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
273 } else if (type == AVMEDIA_TYPE_AUDIO) {
274 enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8,
278 AV_SAMPLE_FMT_DBL, -1 };
280 ret = avfilter_graph_create_filter(&sink, abuffersink,
284 ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
287 ret = av_opt_set_int(sink, "all_channel_counts", 1,
288 AV_OPT_SEARCH_CHILDREN);
292 av_log(avctx, AV_LOG_ERROR,
293 "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
294 FAIL(AVERROR(EINVAL));
297 lavfi->sinks[i] = sink;
298 if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
302 /* configure the graph */
303 if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
306 if (lavfi->dump_graph) {
307 char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
313 /* fill each stream with the information in the corresponding sink */
314 for (i = 0; i < lavfi->nb_sinks; i++) {
315 AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0];
316 AVStream *st = avctx->streams[i];
317 st->codecpar->codec_type = link->type;
318 avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den);
319 if (link->type == AVMEDIA_TYPE_VIDEO) {
320 st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
321 st->codecpar->format = link->format;
322 st->avg_frame_rate = av_inv_q(link->time_base);
323 st->codecpar->width = link->w;
324 st->codecpar->height = link->h;
325 st ->sample_aspect_ratio =
326 st->codecpar->sample_aspect_ratio = link->sample_aspect_ratio;
327 avctx->probesize = FFMAX(avctx->probesize,
329 av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(link->format)) *
331 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
332 st->codecpar->codec_id = av_get_pcm_codec(link->format, -1);
333 st->codecpar->channels = avfilter_link_get_channels(link);
334 st->codecpar->format = link->format;
335 st->codecpar->sample_rate = link->sample_rate;
336 st->avg_frame_rate = av_inv_q(link->time_base);
337 st->codecpar->channel_layout = link->channel_layout;
338 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
339 av_log(avctx, AV_LOG_ERROR,
340 "Could not find PCM codec for sample format %s.\n",
341 av_get_sample_fmt_name(link->format));
345 if ((ret = create_subcc_streams(avctx)) < 0)
348 if (!(lavfi->decoded_frame = av_frame_alloc()))
349 FAIL(AVERROR(ENOMEM));
353 avfilter_inout_free(&input_links);
354 avfilter_inout_free(&output_links);
356 lavfi_read_close(avctx);
360 static int create_subcc_packet(AVFormatContext *avctx, AVFrame *frame,
363 LavfiContext *lavfi = avctx->priv_data;
365 int stream_idx, i, ret;
367 if ((stream_idx = lavfi->sink_stream_subcc_map[sink_idx]) < 0)
369 for (i = 0; i < frame->nb_side_data; i++)
370 if (frame->side_data[i]->type == AV_FRAME_DATA_A53_CC)
372 if (i >= frame->nb_side_data)
374 sd = frame->side_data[i];
375 if ((ret = av_new_packet(&lavfi->subcc_packet, sd->size)) < 0)
377 memcpy(lavfi->subcc_packet.data, sd->data, sd->size);
378 lavfi->subcc_packet.stream_index = stream_idx;
379 lavfi->subcc_packet.pts = frame->pts;
380 lavfi->subcc_packet.pos = av_frame_get_pkt_pos(frame);
384 static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
386 LavfiContext *lavfi = avctx->priv_data;
387 double min_pts = DBL_MAX;
388 int stream_idx, min_pts_sink_idx = 0;
389 AVFrame *frame = lavfi->decoded_frame;
390 AVDictionary *frame_metadata;
394 if (lavfi->subcc_packet.size) {
395 *pkt = lavfi->subcc_packet;
396 av_init_packet(&lavfi->subcc_packet);
397 lavfi->subcc_packet.size = 0;
398 lavfi->subcc_packet.data = NULL;
402 /* iterate through all the graph sinks. Select the sink with the
404 for (i = 0; i < lavfi->nb_sinks; i++) {
405 AVRational tb = lavfi->sinks[i]->inputs[0]->time_base;
409 if (lavfi->sink_eof[i])
412 ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,
413 AV_BUFFERSINK_FLAG_PEEK);
414 if (ret == AVERROR_EOF) {
415 ff_dlog(avctx, "EOF sink_idx:%d\n", i);
416 lavfi->sink_eof[i] = 1;
420 d = av_rescale_q_rnd(frame->pts, tb, AV_TIME_BASE_Q, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
421 ff_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
422 av_frame_unref(frame);
426 min_pts_sink_idx = i;
429 if (min_pts == DBL_MAX)
432 ff_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
434 av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
435 stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
437 if (frame->width /* FIXME best way of testing a video */) {
438 size = av_image_get_buffer_size(frame->format, frame->width, frame->height, 1);
439 if ((ret = av_new_packet(pkt, size)) < 0)
442 av_image_copy_to_buffer(pkt->data, size, (const uint8_t **)frame->data, frame->linesize,
443 frame->format, frame->width, frame->height, 1);
444 } else if (av_frame_get_channels(frame) /* FIXME test audio */) {
445 size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
446 av_frame_get_channels(frame);
447 if ((ret = av_new_packet(pkt, size)) < 0)
449 memcpy(pkt->data, frame->data[0], size);
452 frame_metadata = av_frame_get_metadata(frame);
453 if (frame_metadata) {
455 AVDictionaryEntry *e = NULL;
458 av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
459 while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
460 av_bprintf(&meta_buf, "%s", e->key);
461 av_bprint_chars(&meta_buf, '\0', 1);
462 av_bprintf(&meta_buf, "%s", e->value);
463 av_bprint_chars(&meta_buf, '\0', 1);
465 if (!av_bprint_is_complete(&meta_buf) ||
466 !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,
468 av_bprint_finalize(&meta_buf, NULL);
469 return AVERROR(ENOMEM);
471 memcpy(metadata, meta_buf.str, meta_buf.len);
472 av_bprint_finalize(&meta_buf, NULL);
475 if ((ret = create_subcc_packet(avctx, frame, min_pts_sink_idx)) < 0) {
476 av_frame_unref(frame);
477 av_packet_unref(pkt);
481 pkt->stream_index = stream_idx;
482 pkt->pts = frame->pts;
483 pkt->pos = av_frame_get_pkt_pos(frame);
485 av_frame_unref(frame);
489 #define OFFSET(x) offsetof(LavfiContext, x)
491 #define DEC AV_OPT_FLAG_DECODING_PARAM
493 static const AVOption options[] = {
494 { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
495 { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
496 { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
500 static const AVClass lavfi_class = {
501 .class_name = "lavfi indev",
502 .item_name = av_default_item_name,
504 .version = LIBAVUTIL_VERSION_INT,
505 .category = AV_CLASS_CATEGORY_DEVICE_INPUT,
508 AVInputFormat ff_lavfi_demuxer = {
510 .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
511 .priv_data_size = sizeof(LavfiContext),
512 .read_header = lavfi_read_header,
513 .read_packet = lavfi_read_packet,
514 .read_close = lavfi_read_close,
515 .flags = AVFMT_NOFILE,
516 .priv_class = &lavfi_class,