FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavdevice/lavfi.c
Date: 2026-04-21 03:24:50
Exec Total Coverage
Lines: 192 253 75.9%
Functions: 6 6 100.0%
Branches: 96 146 65.8%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2011 Stefano Sabatini
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
19 */
20
21 /**
22 * @file
23 * libavfilter virtual input device
24 */
25
26 /* #define DEBUG */
27
28 #include <float.h> /* DBL_MIN, DBL_MAX */
29
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/demux.h"
43 #include "libavformat/internal.h"
44 #include "avdevice.h"
45
46 typedef struct {
47 AVClass *class; ///< class for private options
48 char *graph_str;
49 char *graph_filename;
50 char *dump_graph;
51 AVFilterGraph *graph;
52 AVFilterContext **sinks;
53 int *sink_stream_map;
54 int *sink_eof;
55 int *stream_sink_map;
56 int *sink_stream_subcc_map;
57 int nb_sinks;
58 AVPacket subcc_packet;
59 } LavfiContext;
60
61 59 av_cold static int lavfi_read_close(AVFormatContext *avctx)
62 {
63 59 LavfiContext *lavfi = avctx->priv_data;
64
65 59 av_freep(&lavfi->sink_stream_map);
66 59 av_freep(&lavfi->sink_eof);
67 59 av_freep(&lavfi->stream_sink_map);
68 59 av_freep(&lavfi->sink_stream_subcc_map);
69 59 av_freep(&lavfi->sinks);
70 59 avfilter_graph_free(&lavfi->graph);
71
72 59 return 0;
73 }
74
75 59 static int create_subcc_streams(AVFormatContext *avctx)
76 {
77 59 LavfiContext *lavfi = avctx->priv_data;
78 AVStream *st;
79 int stream_idx, sink_idx;
80 AVRational *time_base;
81
82
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 121 for (stream_idx = 0; stream_idx < lavfi->nb_sinks; stream_idx++) {
83 62 sink_idx = lavfi->stream_sink_map[stream_idx];
84
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 62 if (lavfi->sink_stream_subcc_map[sink_idx]) {
85 6 lavfi->sink_stream_subcc_map[sink_idx] = avctx->nb_streams;
86
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 6 if (!(st = avformat_new_stream(avctx, NULL)))
87 ✗ return AVERROR(ENOMEM);
88 6 st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
89 6 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
90 6 time_base = &avctx->streams[stream_idx]->time_base;
91 6 st->time_base.num = time_base->num;
92 6 st->time_base.den = time_base->den;
93 } else {
94 56 lavfi->sink_stream_subcc_map[sink_idx] = -1;
95 }
96 }
97 59 return 0;
98 }
99
100 59 av_cold static int lavfi_read_header(AVFormatContext *avctx)
101 {
102 59 LavfiContext *lavfi = avctx->priv_data;
103 59 AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
104 const AVFilter *buffersink, *abuffersink;
105 enum AVMediaType type;
106 59 int ret = 0, i, n;
107
108 #define FAIL(ERR) { ret = ERR; goto end; }
109
110 59 buffersink = avfilter_get_by_name("buffersink");
111 59 abuffersink = avfilter_get_by_name("abuffersink");
112
113
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 59 if (lavfi->graph_filename && lavfi->graph_str) {
114 ✗ av_log(avctx, AV_LOG_ERROR,
115 "Only one of the graph or graph_file options must be specified\n");
116 ✗ FAIL(AVERROR(EINVAL));
117 }
118
119
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 59 if (lavfi->graph_filename) {
120 AVBPrint graph_file_pb;
121 1 AVIOContext *avio = NULL;
122 1 AVDictionary *options = NULL;
123
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 1 if (avctx->protocol_whitelist && (ret = av_dict_set(&options, "protocol_whitelist", avctx->protocol_whitelist, 0)) < 0)
124 ✗ goto end;
125 1 ret = avio_open2(&avio, lavfi->graph_filename, AVIO_FLAG_READ, &avctx->interrupt_callback, &options);
126 1 av_dict_free(&options);
127
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 1 if (ret < 0)
128 ✗ goto end;
129 1 av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);
130 1 ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX);
131 1 avio_closep(&avio);
132
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 1 if (ret) {
133 ✗ av_bprint_finalize(&graph_file_pb, NULL);
134 ✗ goto end;
135 }
136
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 1 if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))
137 ✗ goto end;
138 }
139
140
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 59 if (!lavfi->graph_str)
141 57 lavfi->graph_str = av_strdup(avctx->url);
142
143 /* parse the graph, create a stream for each open output */
144
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 59 if (!(lavfi->graph = avfilter_graph_alloc()))
145 ✗ FAIL(AVERROR(ENOMEM));
146
147
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 59 if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,
148 &input_links, &output_links, avctx)) < 0)
149 ✗ goto end;
150
151
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 59 if (input_links) {
152 ✗ av_log(avctx, AV_LOG_ERROR,
153 "Open inputs in the filtergraph are not acceptable\n");
154 ✗ FAIL(AVERROR(EINVAL));
155 }
156
157 /* count the outputs */
158
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 121 for (n = 0, inout = output_links; inout; n++, inout = inout->next);
159 59 lavfi->nb_sinks = n;
160
161
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 59 if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
162 ✗ FAIL(AVERROR(ENOMEM));
163
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 59 if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
164 ✗ FAIL(AVERROR(ENOMEM));
165
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 59 if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
166 ✗ FAIL(AVERROR(ENOMEM));
167
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 59 if (!(lavfi->sink_stream_subcc_map = av_malloc(sizeof(int) * n)))
168 ✗ FAIL(AVERROR(ENOMEM));
169
170
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 121 for (i = 0; i < n; i++)
171 62 lavfi->stream_sink_map[i] = -1;
172
173 /* parse the output link names - they need to be of the form out0, out1, ...
174 * create a mapping between them and the streams */
175
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 121 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
176 62 int stream_idx = 0, suffix = 0, use_subcc = 0;
177
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 62 if (!inout->name) {
178 ✗ av_log(avctx, AV_LOG_ERROR, "Missing %d outpad name\n", i);
179 ✗ FAIL(AVERROR(EINVAL));
180 }
181 62 sscanf(inout->name, "out%n%d%n", &suffix, &stream_idx, &suffix);
182
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 62 if (!suffix) {
183 ✗ av_log(avctx, AV_LOG_ERROR,
184 "Invalid outpad name '%s'\n", inout->name);
185 ✗ FAIL(AVERROR(EINVAL));
186 }
187
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 62 if (inout->name[suffix]) {
188
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 6 if (!strcmp(inout->name + suffix, "+subcc")) {
189 6 use_subcc = 1;
190 } else {
191 ✗ av_log(avctx, AV_LOG_ERROR,
192 "Invalid outpad suffix '%s'\n", inout->name);
193 ✗ FAIL(AVERROR(EINVAL));
194 }
195 }
196
197
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 62 if ((unsigned)stream_idx >= n) {
198 ✗ av_log(avctx, AV_LOG_ERROR,
199 "Invalid index was specified in output '%s', "
200 "must be a non-negative value < %d\n",
201 inout->name, n);
202 ✗ FAIL(AVERROR(EINVAL));
203 }
204
205
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 62 if (lavfi->stream_sink_map[stream_idx] != -1) {
206 ✗ av_log(avctx, AV_LOG_ERROR,
207 "An output with stream index %d was already specified\n",
208 stream_idx);
209 ✗ FAIL(AVERROR(EINVAL));
210 }
211 62 lavfi->sink_stream_map[i] = stream_idx;
212 62 lavfi->stream_sink_map[stream_idx] = i;
213 62 lavfi->sink_stream_subcc_map[i] = !!use_subcc;
214 }
215
216 /* for each open output create a corresponding stream */
217
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 121 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
218 AVStream *st;
219
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 62 if (!(st = avformat_new_stream(avctx, NULL)))
220 ✗ FAIL(AVERROR(ENOMEM));
221 62 st->id = i;
222 }
223
224 /* create a sink for each output and connect them to the graph */
225 59 lavfi->sinks = av_malloc_array(lavfi->nb_sinks, sizeof(AVFilterContext *));
226
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 59 if (!lavfi->sinks)
227 ✗ FAIL(AVERROR(ENOMEM));
228
229
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 121 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
230 AVFilterContext *sink;
231
232 62 type = avfilter_pad_get_type(inout->filter_ctx->output_pads, inout->pad_idx);
233
234
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 62 if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
235
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 27 type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
236 ✗ av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
237 ✗ FAIL(AVERROR_FILTER_NOT_FOUND);
238 }
239
240
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 62 if (type == AVMEDIA_TYPE_VIDEO) {
241 35 ret = avfilter_graph_create_filter(&sink, buffersink,
242 35 inout->name, NULL,
243 NULL, lavfi->graph);
244
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 35 if (ret < 0)
245 ✗ goto end;
246
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 27 } else if (type == AVMEDIA_TYPE_AUDIO) {
247 static const enum AVSampleFormat sample_fmts[] = {
248 AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32,
249 AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_DBL,
250 };
251
252 27 sink = avfilter_graph_alloc_filter(lavfi->graph, abuffersink, inout->name);
253
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 27 if (!sink) {
254 ✗ ret = AVERROR(ENOMEM);
255 ✗ goto end;
256 }
257
258 27 ret = av_opt_set_array(sink, "sample_formats", AV_OPT_SEARCH_CHILDREN, 0,
259 FF_ARRAY_ELEMS(sample_fmts), AV_OPT_TYPE_SAMPLE_FMT,
260 sample_fmts);
261
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 27 if (ret < 0)
262 ✗ goto end;
263
264 27 ret = avfilter_init_dict(sink, NULL);
265
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 27 if (ret < 0)
266 ✗ goto end;
267 } else {
268 ✗ av_log(avctx, AV_LOG_ERROR,
269 "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
270 ✗ FAIL(AVERROR(EINVAL));
271 }
272
273 62 lavfi->sinks[i] = sink;
274
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 62 if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
275 ✗ goto end;
276 }
277
278 /* configure the graph */
279
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 59 if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
280 ✗ goto end;
281
282
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 59 if (lavfi->dump_graph) {
283 ✗ char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
284 ✗ if (dump != NULL) {
285 ✗ fputs(dump, stderr);
286 ✗ fflush(stderr);
287 ✗ av_free(dump);
288 } else {
289 ✗ FAIL(AVERROR(ENOMEM));
290 }
291 }
292
293 /* fill each stream with the information in the corresponding sink */
294
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 121 for (i = 0; i < lavfi->nb_sinks; i++) {
295 62 AVFilterContext *sink = lavfi->sinks[lavfi->stream_sink_map[i]];
296 62 AVRational time_base = av_buffersink_get_time_base(sink);
297 62 AVRational frame_rate = av_buffersink_get_frame_rate(sink);
298 62 AVStream *st = avctx->streams[i];
299 62 AVCodecParameters *const par = st->codecpar;
300 62 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
301 62 par->codec_type = av_buffersink_get_type(sink);
302
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 62 if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
303 35 par->codec_id = AV_CODEC_ID_WRAPPED_AVFRAME;
304 35 par->format = av_buffersink_get_format(sink);
305 35 par->width = av_buffersink_get_w(sink);
306 35 par->height = av_buffersink_get_h(sink);
307 35 avctx->probesize = FFMAX(avctx->probesize, sizeof(AVFrame) * 30);
308 35 st ->sample_aspect_ratio =
309 35 par->sample_aspect_ratio = av_buffersink_get_sample_aspect_ratio(sink);
310
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 35 if (frame_rate.num > 0 && frame_rate.den > 0) {
311 35 st->avg_frame_rate = frame_rate;
312 35 st->r_frame_rate = frame_rate;
313 }
314
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 27 } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
315 27 par->sample_rate = av_buffersink_get_sample_rate(sink);
316 27 ret = av_buffersink_get_ch_layout(sink, &par->ch_layout);
317
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 27 if (ret < 0)
318 ✗ goto end;
319 27 par->format = av_buffersink_get_format(sink);
320 27 par->codec_id = av_get_pcm_codec(par->format, -1);
321
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 27 if (par->codec_id == AV_CODEC_ID_NONE)
322 ✗ av_log(avctx, AV_LOG_ERROR,
323 "Could not find PCM codec for sample format %s.\n",
324 ✗ av_get_sample_fmt_name(par->format));
325 }
326 }
327
328
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 59 if ((ret = create_subcc_streams(avctx)) < 0)
329 ✗ goto end;
330
331 59 end:
332 59 avfilter_inout_free(&input_links);
333 59 avfilter_inout_free(&output_links);
334 59 return ret;
335 }
336
337 13565 static int create_subcc_packet(AVFormatContext *avctx, AVFrame *frame,
338 int sink_idx)
339 {
340 13565 LavfiContext *lavfi = avctx->priv_data;
341 AVFrameSideData *sd;
342 int stream_idx, ret;
343
344
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 13565 if ((stream_idx = lavfi->sink_stream_subcc_map[sink_idx]) < 0)
345 12621 return 0;
346
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 944 if (!(sd = av_frame_get_side_data(frame, AV_FRAME_DATA_A53_CC)))
347 ✗ return 0;
348
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 944 if ((ret = av_new_packet(&lavfi->subcc_packet, sd->size)) < 0)
349 ✗ return ret;
350 944 memcpy(lavfi->subcc_packet.data, sd->data, sd->size);
351 944 lavfi->subcc_packet.stream_index = stream_idx;
352 944 lavfi->subcc_packet.pts = frame->pts;
353 944 return 0;
354 }
355
356 3293 static void lavfi_free_frame(void *opaque, uint8_t *data)
357 {
358 3293 AVFrame *frame = (AVFrame*)data;
359 3293 av_frame_free(&frame);
360 3293 }
361
362 14564 static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
363 {
364 14564 LavfiContext *lavfi = avctx->priv_data;
365 14564 double min_pts = DBL_MAX;
366 14564 int stream_idx, min_pts_sink_idx = 0;
367 AVFrame *frame, *frame_to_free;
368 AVDictionary *frame_metadata;
369 int ret, i;
370 AVStream *st;
371
372
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 14564 if (lavfi->subcc_packet.size) {
373 944 av_packet_move_ref(pkt, &lavfi->subcc_packet);
374 944 return pkt->size;
375 }
376
377 13620 frame = av_frame_alloc();
378
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 13620 if (!frame)
379 ✗ return AVERROR(ENOMEM);
380 13620 frame_to_free = frame;
381
382 /* iterate through all the graph sinks. Select the sink with the
383 * minimum PTS */
384
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 27297 for (i = 0; i < lavfi->nb_sinks; i++) {
385 13677 AVRational tb = av_buffersink_get_time_base(lavfi->sinks[i]);
386 double d;
387
388
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 13677 if (lavfi->sink_eof[i])
389 87 continue;
390
391 13647 ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,
392 AV_BUFFERSINK_FLAG_PEEK);
393
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 13647 if (ret == AVERROR_EOF) {
394 ff_dlog(avctx, "EOF sink_idx:%d\n", i);
395 57 lavfi->sink_eof[i] = 1;
396 57 continue;
397
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 13590 } else if (ret < 0)
398 ✗ goto fail;
399 13590 d = av_rescale_q_rnd(frame->pts, tb, AV_TIME_BASE_Q, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
400 ff_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
401 13590 av_frame_unref(frame);
402
403
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 13590 if (d < min_pts) {
404 13571 min_pts = d;
405 13571 min_pts_sink_idx = i;
406 }
407 }
408
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 13620 if (min_pts == DBL_MAX) {
409 55 ret = AVERROR_EOF;
410 55 goto fail;
411 }
412
413 ff_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
414
415 13565 av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
416 13565 stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
417 13565 st = avctx->streams[stream_idx];
418
419
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 13565 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
420 3293 pkt->buf = av_buffer_create((uint8_t*)frame, sizeof(*frame),
421 &lavfi_free_frame, NULL, 0);
422
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 3293 if (!pkt->buf) {
423 ✗ ret = AVERROR(ENOMEM);
424 ✗ goto fail;
425 }
426 3293 frame_to_free = NULL;
427
428 3293 pkt->data = pkt->buf->data;
429 3293 pkt->size = pkt->buf->size;
430 3293 pkt->flags |= AV_PKT_FLAG_TRUSTED;
431
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 10272 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
432 10272 int size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
433 10272 frame->ch_layout.nb_channels;
434
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 10272 if ((ret = av_new_packet(pkt, size)) < 0)
435 ✗ goto fail;
436 10272 memcpy(pkt->data, frame->data[0], size);
437 }
438
439 13565 frame_metadata = frame->metadata;
440
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 13565 if (frame_metadata) {
441 size_t size;
442 469 uint8_t *metadata = av_packet_pack_dictionary(frame_metadata, &size);
443
444
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 469 if (!metadata) {
445 ✗ ret = AVERROR(ENOMEM);
446 ✗ goto fail;
447 }
448
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 469 if ((ret = av_packet_add_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,
449 metadata, size)) < 0) {
450 ✗ av_freep(&metadata);
451 ✗ goto fail;
452 }
453 }
454
455
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 13565 if ((ret = create_subcc_packet(avctx, frame, min_pts_sink_idx)) < 0) {
456 ✗ goto fail;
457 }
458
459 13565 pkt->stream_index = stream_idx;
460 13565 pkt->pts = frame->pts;
461
462 13565 av_frame_free(&frame_to_free);
463
464 13565 return pkt->size;
465 55 fail:
466 55 av_frame_free(&frame_to_free);
467 55 return ret;
468
469 }
470
471 #define OFFSET(x) offsetof(LavfiContext, x)
472
473 #define DEC AV_OPT_FLAG_DECODING_PARAM
474
475 static const AVOption options[] = {
476 { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
477 { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
478 { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
479 { NULL },
480 };
481
482 static const AVClass lavfi_class = {
483 .class_name = "lavfi indev",
484 .item_name = av_default_item_name,
485 .option = options,
486 .version = LIBAVUTIL_VERSION_INT,
487 .category = AV_CLASS_CATEGORY_DEVICE_INPUT,
488 };
489
490 const FFInputFormat ff_lavfi_demuxer = {
491 .p.name = "lavfi",
492 .p.long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
493 .p.flags = AVFMT_NOFILE,
494 .p.priv_class = &lavfi_class,
495 .priv_data_size = sizeof(LavfiContext),
496 .read_header = lavfi_read_header,
497 .read_packet = lavfi_read_packet,
498 .read_close = lavfi_read_close,
499 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
500 };
501