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/avio_internal.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 AVFrame *decoded_frame;
58 int nb_sinks;
59 AVPacket subcc_packet;
60 } LavfiContext;
61
create_all_formats(int n)62 static int *create_all_formats(int n)
63 {
64 int i, j, *fmts, count = 0;
65
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))
69 count++;
70 }
71
72 if (!(fmts = av_malloc_array(count + 1, sizeof(*fmts))))
73 return NULL;
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))
77 fmts[j++] = i;
78 }
79 fmts[j] = -1;
80 return fmts;
81 }
82
lavfi_read_close(AVFormatContext * avctx)83 av_cold static int lavfi_read_close(AVFormatContext *avctx)
84 {
85 LavfiContext *lavfi = avctx->priv_data;
86
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);
94
95 return 0;
96 }
97
create_subcc_streams(AVFormatContext * avctx)98 static int create_subcc_streams(AVFormatContext *avctx)
99 {
100 LavfiContext *lavfi = avctx->priv_data;
101 AVStream *st;
102 int stream_idx, sink_idx;
103
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;
112 } else {
113 lavfi->sink_stream_subcc_map[sink_idx] = -1;
114 }
115 }
116 return 0;
117 }
118
lavfi_read_header(AVFormatContext * avctx)119 av_cold static int lavfi_read_header(AVFormatContext *avctx)
120 {
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;
126 int ret = 0, i, n;
127
128 #define FAIL(ERR) { ret = ERR; goto end; }
129
130 if (!pix_fmts)
131 FAIL(AVERROR(ENOMEM));
132
133 buffersink = avfilter_get_by_name("buffersink");
134 abuffersink = avfilter_get_by_name("abuffersink");
135
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));
140 }
141
142 if (lavfi->graph_filename) {
143 AVBPrint graph_file_pb;
144 AVIOContext *avio = NULL;
145 AVDictionary *options = NULL;
146 if (avctx->protocol_whitelist && (ret = av_dict_set(&options, "protocol_whitelist", avctx->protocol_whitelist, 0)) < 0)
147 goto end;
148 ret = avio_open2(&avio, lavfi->graph_filename, AVIO_FLAG_READ, &avctx->interrupt_callback, &options);
149 av_dict_set(&options, "protocol_whitelist", NULL, 0);
150 if (ret < 0)
151 goto end;
152 av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);
153 ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX);
154 avio_closep(&avio);
155 av_bprint_chars(&graph_file_pb, '\0', 1);
156 if (!ret && !av_bprint_is_complete(&graph_file_pb))
157 ret = AVERROR(ENOMEM);
158 if (ret) {
159 av_bprint_finalize(&graph_file_pb, NULL);
160 goto end;
161 }
162 if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))
163 goto end;
164 }
165
166 if (!lavfi->graph_str)
167 lavfi->graph_str = av_strdup(avctx->url);
168
169 /* parse the graph, create a stream for each open output */
170 if (!(lavfi->graph = avfilter_graph_alloc()))
171 FAIL(AVERROR(ENOMEM));
172
173 if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,
174 &input_links, &output_links, avctx)) < 0)
175 goto end;
176
177 if (input_links) {
178 av_log(avctx, AV_LOG_ERROR,
179 "Open inputs in the filtergraph are not acceptable\n");
180 FAIL(AVERROR(EINVAL));
181 }
182
183 /* count the outputs */
184 for (n = 0, inout = output_links; inout; n++, inout = inout->next);
185 lavfi->nb_sinks = n;
186
187 if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
188 FAIL(AVERROR(ENOMEM));
189 if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
190 FAIL(AVERROR(ENOMEM));
191 if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
192 FAIL(AVERROR(ENOMEM));
193 if (!(lavfi->sink_stream_subcc_map = av_malloc(sizeof(int) * n)))
194 FAIL(AVERROR(ENOMEM));
195
196 for (i = 0; i < n; i++)
197 lavfi->stream_sink_map[i] = -1;
198
199 /* parse the output link names - they need to be of the form out0, out1, ...
200 * create a mapping between them and the streams */
201 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
202 int stream_idx = 0, suffix = 0, use_subcc = 0;
203 sscanf(inout->name, "out%n%d%n", &suffix, &stream_idx, &suffix);
204 if (!suffix) {
205 av_log(avctx, AV_LOG_ERROR,
206 "Invalid outpad name '%s'\n", inout->name);
207 FAIL(AVERROR(EINVAL));
208 }
209 if (inout->name[suffix]) {
210 if (!strcmp(inout->name + suffix, "+subcc")) {
211 use_subcc = 1;
212 } else {
213 av_log(avctx, AV_LOG_ERROR,
214 "Invalid outpad suffix '%s'\n", inout->name);
215 FAIL(AVERROR(EINVAL));
216 }
217 }
218
219 if ((unsigned)stream_idx >= n) {
220 av_log(avctx, AV_LOG_ERROR,
221 "Invalid index was specified in output '%s', "
222 "must be a non-negative value < %d\n",
223 inout->name, n);
224 FAIL(AVERROR(EINVAL));
225 }
226
227 if (lavfi->stream_sink_map[stream_idx] != -1) {
228 av_log(avctx, AV_LOG_ERROR,
229 "An output with stream index %d was already specified\n",
230 stream_idx);
231 FAIL(AVERROR(EINVAL));
232 }
233 lavfi->sink_stream_map[i] = stream_idx;
234 lavfi->stream_sink_map[stream_idx] = i;
235 lavfi->sink_stream_subcc_map[i] = !!use_subcc;
236 }
237
238 /* for each open output create a corresponding stream */
239 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
240 AVStream *st;
241 if (!(st = avformat_new_stream(avctx, NULL)))
242 FAIL(AVERROR(ENOMEM));
243 st->id = i;
244 }
245
246 /* create a sink for each output and connect them to the graph */
247 lavfi->sinks = av_malloc_array(lavfi->nb_sinks, sizeof(AVFilterContext *));
248 if (!lavfi->sinks)
249 FAIL(AVERROR(ENOMEM));
250
251 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
252 AVFilterContext *sink;
253
254 type = avfilter_pad_get_type(inout->filter_ctx->output_pads, inout->pad_idx);
255
256 if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
257 type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
258 av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
259 FAIL(AVERROR_FILTER_NOT_FOUND);
260 }
261
262 if (type == AVMEDIA_TYPE_VIDEO) {
263 ret = avfilter_graph_create_filter(&sink, buffersink,
264 inout->name, NULL,
265 NULL, lavfi->graph);
266 if (ret >= 0)
267 ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
268 if (ret < 0)
269 goto end;
270 } else if (type == AVMEDIA_TYPE_AUDIO) {
271 enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8,
272 AV_SAMPLE_FMT_S16,
273 AV_SAMPLE_FMT_S32,
274 AV_SAMPLE_FMT_FLT,
275 AV_SAMPLE_FMT_DBL, -1 };
276
277 ret = avfilter_graph_create_filter(&sink, abuffersink,
278 inout->name, NULL,
279 NULL, lavfi->graph);
280 if (ret >= 0)
281 ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
282 if (ret < 0)
283 goto end;
284 ret = av_opt_set_int(sink, "all_channel_counts", 1,
285 AV_OPT_SEARCH_CHILDREN);
286 if (ret < 0)
287 goto end;
288 } else {
289 av_log(avctx, AV_LOG_ERROR,
290 "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
291 FAIL(AVERROR(EINVAL));
292 }
293
294 lavfi->sinks[i] = sink;
295 if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
296 goto end;
297 }
298
299 /* configure the graph */
300 if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
301 goto end;
302
303 if (lavfi->dump_graph) {
304 char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
305 if (dump != NULL) {
306 fputs(dump, stderr);
307 fflush(stderr);
308 av_free(dump);
309 } else {
310 FAIL(AVERROR(ENOMEM));
311 }
312 }
313
314 /* fill each stream with the information in the corresponding sink */
315 for (i = 0; i < lavfi->nb_sinks; i++) {
316 AVFilterContext *sink = lavfi->sinks[lavfi->stream_sink_map[i]];
317 AVRational time_base = av_buffersink_get_time_base(sink);
318 AVStream *st = avctx->streams[i];
319 st->codecpar->codec_type = av_buffersink_get_type(sink);
320 avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
321 if (av_buffersink_get_type(sink) == AVMEDIA_TYPE_VIDEO) {
322 st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
323 st->codecpar->format = av_buffersink_get_format(sink);
324 st->codecpar->width = av_buffersink_get_w(sink);
325 st->codecpar->height = av_buffersink_get_h(sink);
326 st ->sample_aspect_ratio =
327 st->codecpar->sample_aspect_ratio = av_buffersink_get_sample_aspect_ratio(sink);
328 avctx->probesize = FFMAX(avctx->probesize,
329 av_buffersink_get_w(sink) * av_buffersink_get_h(sink) *
330 av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(av_buffersink_get_format(sink))) *
331 30);
332 } else if (av_buffersink_get_type(sink) == AVMEDIA_TYPE_AUDIO) {
333 st->codecpar->codec_id = av_get_pcm_codec(av_buffersink_get_format(sink), -1);
334 st->codecpar->channels = av_buffersink_get_channels(sink);
335 st->codecpar->format = av_buffersink_get_format(sink);
336 st->codecpar->sample_rate = av_buffersink_get_sample_rate(sink);
337 st->codecpar->channel_layout = av_buffersink_get_channel_layout(sink);
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(av_buffersink_get_format(sink)));
342 }
343 }
344
345 if ((ret = create_subcc_streams(avctx)) < 0)
346 goto end;
347
348 if (!(lavfi->decoded_frame = av_frame_alloc()))
349 FAIL(AVERROR(ENOMEM));
350
351 end:
352 av_free(pix_fmts);
353 avfilter_inout_free(&input_links);
354 avfilter_inout_free(&output_links);
355 if (ret < 0)
356 lavfi_read_close(avctx);
357 return ret;
358 }
359
create_subcc_packet(AVFormatContext * avctx,AVFrame * frame,int sink_idx)360 static int create_subcc_packet(AVFormatContext *avctx, AVFrame *frame,
361 int sink_idx)
362 {
363 LavfiContext *lavfi = avctx->priv_data;
364 AVFrameSideData *sd;
365 int stream_idx, ret;
366
367 if ((stream_idx = lavfi->sink_stream_subcc_map[sink_idx]) < 0)
368 return 0;
369 if (!(sd = av_frame_get_side_data(frame, AV_FRAME_DATA_A53_CC)))
370 return 0;
371 if ((ret = av_new_packet(&lavfi->subcc_packet, sd->size)) < 0)
372 return ret;
373 memcpy(lavfi->subcc_packet.data, sd->data, sd->size);
374 lavfi->subcc_packet.stream_index = stream_idx;
375 lavfi->subcc_packet.pts = frame->pts;
376 lavfi->subcc_packet.pos = frame->pkt_pos;
377 return 0;
378 }
379
lavfi_read_packet(AVFormatContext * avctx,AVPacket * pkt)380 static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
381 {
382 LavfiContext *lavfi = avctx->priv_data;
383 double min_pts = DBL_MAX;
384 int stream_idx, min_pts_sink_idx = 0;
385 AVFrame *frame = lavfi->decoded_frame;
386 AVDictionary *frame_metadata;
387 int ret, i;
388 int size = 0;
389 AVStream *st;
390
391 if (lavfi->subcc_packet.size) {
392 av_packet_move_ref(pkt, &lavfi->subcc_packet);
393 return pkt->size;
394 }
395
396 /* iterate through all the graph sinks. Select the sink with the
397 * minimum PTS */
398 for (i = 0; i < lavfi->nb_sinks; i++) {
399 AVRational tb = av_buffersink_get_time_base(lavfi->sinks[i]);
400 double d;
401 int ret;
402
403 if (lavfi->sink_eof[i])
404 continue;
405
406 ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,
407 AV_BUFFERSINK_FLAG_PEEK);
408 if (ret == AVERROR_EOF) {
409 ff_dlog(avctx, "EOF sink_idx:%d\n", i);
410 lavfi->sink_eof[i] = 1;
411 continue;
412 } else if (ret < 0)
413 return ret;
414 d = av_rescale_q_rnd(frame->pts, tb, AV_TIME_BASE_Q, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
415 ff_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
416 av_frame_unref(frame);
417
418 if (d < min_pts) {
419 min_pts = d;
420 min_pts_sink_idx = i;
421 }
422 }
423 if (min_pts == DBL_MAX)
424 return AVERROR_EOF;
425
426 ff_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
427
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];
430 st = avctx->streams[stream_idx];
431
432 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
433 size = av_image_get_buffer_size(frame->format, frame->width, frame->height, 1);
434 if ((ret = av_new_packet(pkt, size)) < 0)
435 goto fail;
436
437 av_image_copy_to_buffer(pkt->data, size, (const uint8_t **)frame->data, frame->linesize,
438 frame->format, frame->width, frame->height, 1);
439 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
440 size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
441 frame->channels;
442 if ((ret = av_new_packet(pkt, size)) < 0)
443 goto fail;
444 memcpy(pkt->data, frame->data[0], size);
445 }
446
447 frame_metadata = frame->metadata;
448 if (frame_metadata) {
449 buffer_size_t size;
450 uint8_t *metadata = av_packet_pack_dictionary(frame_metadata, &size);
451
452 if (!metadata) {
453 ret = AVERROR(ENOMEM);
454 goto fail;
455 }
456 if ((ret = av_packet_add_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,
457 metadata, size)) < 0) {
458 av_freep(&metadata);
459 goto fail;
460 }
461 }
462
463 if ((ret = create_subcc_packet(avctx, frame, min_pts_sink_idx)) < 0) {
464 goto fail;
465 }
466
467 pkt->stream_index = stream_idx;
468 pkt->pts = frame->pts;
469 pkt->pos = frame->pkt_pos;
470 av_frame_unref(frame);
471 return size;
472 fail:
473 av_frame_unref(frame);
474 return ret;
475
476 }
477
478 #define OFFSET(x) offsetof(LavfiContext, x)
479
480 #define DEC AV_OPT_FLAG_DECODING_PARAM
481
482 static const AVOption options[] = {
483 { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
484 { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
485 { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
486 { NULL },
487 };
488
489 static const AVClass lavfi_class = {
490 .class_name = "lavfi indev",
491 .item_name = av_default_item_name,
492 .option = options,
493 .version = LIBAVUTIL_VERSION_INT,
494 .category = AV_CLASS_CATEGORY_DEVICE_INPUT,
495 };
496
497 AVInputFormat ff_lavfi_demuxer = {
498 .name = "lavfi",
499 .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
500 .priv_data_size = sizeof(LavfiContext),
501 .read_header = lavfi_read_header,
502 .read_packet = lavfi_read_packet,
503 .read_close = lavfi_read_close,
504 .flags = AVFMT_NOFILE,
505 .priv_class = &lavfi_class,
506 };
507