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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/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" | |
42 | #include "avdevice.h" | |
43 | ||
44 | typedef struct { | |
45 | AVClass *class; ///< class for private options | |
46 | char *graph_str; | |
47 | char *graph_filename; | |
48 | char *dump_graph; | |
49 | AVFilterGraph *graph; | |
50 | AVFilterContext **sinks; | |
51 | int *sink_stream_map; | |
52 | int *sink_eof; | |
53 | int *stream_sink_map; | |
54 | AVFrame *decoded_frame; | |
55 | } LavfiContext; | |
56 | ||
57 | static int *create_all_formats(int n) | |
58 | { | |
59 | int i, j, *fmts, count = 0; | |
60 | ||
61 | for (i = 0; i < n; i++) { | |
62 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i); | |
63 | if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL)) | |
64 | count++; | |
65 | } | |
66 | ||
67 | if (!(fmts = av_malloc((count+1) * sizeof(int)))) | |
68 | return NULL; | |
69 | for (j = 0, i = 0; i < n; i++) { | |
70 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i); | |
71 | if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL)) | |
72 | fmts[j++] = i; | |
73 | } | |
74 | fmts[j] = -1; | |
75 | return fmts; | |
76 | } | |
77 | ||
78 | av_cold static int lavfi_read_close(AVFormatContext *avctx) | |
79 | { | |
80 | LavfiContext *lavfi = avctx->priv_data; | |
81 | ||
82 | av_freep(&lavfi->sink_stream_map); | |
83 | av_freep(&lavfi->sink_eof); | |
84 | av_freep(&lavfi->stream_sink_map); | |
85 | av_freep(&lavfi->sinks); | |
86 | avfilter_graph_free(&lavfi->graph); | |
87 | av_frame_free(&lavfi->decoded_frame); | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | av_cold static int lavfi_read_header(AVFormatContext *avctx) | |
93 | { | |
94 | LavfiContext *lavfi = avctx->priv_data; | |
95 | AVFilterInOut *input_links = NULL, *output_links = NULL, *inout; | |
96 | AVFilter *buffersink, *abuffersink; | |
97 | int *pix_fmts = create_all_formats(AV_PIX_FMT_NB); | |
98 | enum AVMediaType type; | |
99 | int ret = 0, i, n; | |
100 | ||
101 | #define FAIL(ERR) { ret = ERR; goto end; } | |
102 | ||
103 | if (!pix_fmts) | |
104 | FAIL(AVERROR(ENOMEM)); | |
105 | ||
106 | avfilter_register_all(); | |
107 | ||
108 | buffersink = avfilter_get_by_name("buffersink"); | |
109 | abuffersink = avfilter_get_by_name("abuffersink"); | |
110 | ||
111 | if (lavfi->graph_filename && lavfi->graph_str) { | |
112 | av_log(avctx, AV_LOG_ERROR, | |
113 | "Only one of the graph or graph_file options must be specified\n"); | |
114 | FAIL(AVERROR(EINVAL)); | |
115 | } | |
116 | ||
117 | if (lavfi->graph_filename) { | |
118 | AVBPrint graph_file_pb; | |
119 | AVIOContext *avio = NULL; | |
120 | ret = avio_open(&avio, lavfi->graph_filename, AVIO_FLAG_READ); | |
121 | if (ret < 0) | |
122 | goto end; | |
123 | av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED); | |
124 | ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX); | |
125 | avio_close(avio); | |
126 | av_bprint_chars(&graph_file_pb, '\0', 1); | |
127 | if (!ret && !av_bprint_is_complete(&graph_file_pb)) | |
128 | ret = AVERROR(ENOMEM); | |
129 | if (ret) { | |
130 | av_bprint_finalize(&graph_file_pb, NULL); | |
131 | goto end; | |
132 | } | |
133 | if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str))) | |
134 | goto end; | |
135 | } | |
136 | ||
137 | if (!lavfi->graph_str) | |
138 | lavfi->graph_str = av_strdup(avctx->filename); | |
139 | ||
140 | /* parse the graph, create a stream for each open output */ | |
141 | if (!(lavfi->graph = avfilter_graph_alloc())) | |
142 | FAIL(AVERROR(ENOMEM)); | |
143 | ||
144 | if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str, | |
145 | &input_links, &output_links, avctx)) < 0) | |
146 | goto end; | |
147 | ||
148 | if (input_links) { | |
149 | av_log(avctx, AV_LOG_ERROR, | |
150 | "Open inputs in the filtergraph are not acceptable\n"); | |
151 | FAIL(AVERROR(EINVAL)); | |
152 | } | |
153 | ||
154 | /* count the outputs */ | |
155 | for (n = 0, inout = output_links; inout; n++, inout = inout->next); | |
156 | ||
157 | if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n))) | |
158 | FAIL(AVERROR(ENOMEM)); | |
159 | if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n))) | |
160 | FAIL(AVERROR(ENOMEM)); | |
161 | if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n))) | |
162 | FAIL(AVERROR(ENOMEM)); | |
163 | ||
164 | for (i = 0; i < n; i++) | |
165 | lavfi->stream_sink_map[i] = -1; | |
166 | ||
167 | /* parse the output link names - they need to be of the form out0, out1, ... | |
168 | * create a mapping between them and the streams */ | |
169 | for (i = 0, inout = output_links; inout; i++, inout = inout->next) { | |
170 | int stream_idx; | |
171 | if (!strcmp(inout->name, "out")) | |
172 | stream_idx = 0; | |
173 | else if (sscanf(inout->name, "out%d\n", &stream_idx) != 1) { | |
174 | av_log(avctx, AV_LOG_ERROR, | |
175 | "Invalid outpad name '%s'\n", inout->name); | |
176 | FAIL(AVERROR(EINVAL)); | |
177 | } | |
178 | ||
179 | if ((unsigned)stream_idx >= n) { | |
180 | av_log(avctx, AV_LOG_ERROR, | |
181 | "Invalid index was specified in output '%s', " | |
182 | "must be a non-negative value < %d\n", | |
183 | inout->name, n); | |
184 | FAIL(AVERROR(EINVAL)); | |
185 | } | |
186 | ||
187 | if (lavfi->stream_sink_map[stream_idx] != -1) { | |
188 | av_log(avctx, AV_LOG_ERROR, | |
189 | "An output with stream index %d was already specified\n", | |
190 | stream_idx); | |
191 | FAIL(AVERROR(EINVAL)); | |
192 | } | |
193 | lavfi->sink_stream_map[i] = stream_idx; | |
194 | lavfi->stream_sink_map[stream_idx] = i; | |
195 | } | |
196 | ||
197 | /* for each open output create a corresponding stream */ | |
198 | for (i = 0, inout = output_links; inout; i++, inout = inout->next) { | |
199 | AVStream *st; | |
200 | if (!(st = avformat_new_stream(avctx, NULL))) | |
201 | FAIL(AVERROR(ENOMEM)); | |
202 | st->id = i; | |
203 | } | |
204 | ||
205 | /* create a sink for each output and connect them to the graph */ | |
206 | lavfi->sinks = av_malloc_array(avctx->nb_streams, sizeof(AVFilterContext *)); | |
207 | if (!lavfi->sinks) | |
208 | FAIL(AVERROR(ENOMEM)); | |
209 | ||
210 | for (i = 0, inout = output_links; inout; i++, inout = inout->next) { | |
211 | AVFilterContext *sink; | |
212 | ||
213 | type = inout->filter_ctx->output_pads[inout->pad_idx].type; | |
214 | ||
215 | if (type == AVMEDIA_TYPE_VIDEO && ! buffersink || | |
216 | type == AVMEDIA_TYPE_AUDIO && ! abuffersink) { | |
217 | av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n"); | |
218 | FAIL(AVERROR_FILTER_NOT_FOUND); | |
219 | } | |
220 | ||
221 | if (type == AVMEDIA_TYPE_VIDEO) { | |
222 | ret = avfilter_graph_create_filter(&sink, buffersink, | |
223 | inout->name, NULL, | |
224 | NULL, lavfi->graph); | |
225 | if (ret >= 0) | |
226 | ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN); | |
227 | if (ret < 0) | |
228 | goto end; | |
229 | } else if (type == AVMEDIA_TYPE_AUDIO) { | |
230 | enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8, | |
231 | AV_SAMPLE_FMT_S16, | |
232 | AV_SAMPLE_FMT_S32, | |
233 | AV_SAMPLE_FMT_FLT, | |
234 | AV_SAMPLE_FMT_DBL, -1 }; | |
235 | ||
236 | ret = avfilter_graph_create_filter(&sink, abuffersink, | |
237 | inout->name, NULL, | |
238 | NULL, lavfi->graph); | |
239 | if (ret >= 0) | |
240 | ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN); | |
241 | if (ret < 0) | |
242 | goto end; | |
243 | ret = av_opt_set_int(sink, "all_channel_counts", 1, | |
244 | AV_OPT_SEARCH_CHILDREN); | |
245 | if (ret < 0) | |
246 | goto end; | |
247 | } else { | |
248 | av_log(avctx, AV_LOG_ERROR, | |
249 | "Output '%s' is not a video or audio output, not yet supported\n", inout->name); | |
250 | FAIL(AVERROR(EINVAL)); | |
251 | } | |
252 | ||
253 | lavfi->sinks[i] = sink; | |
254 | if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0) | |
255 | goto end; | |
256 | } | |
257 | ||
258 | /* configure the graph */ | |
259 | if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0) | |
260 | goto end; | |
261 | ||
262 | if (lavfi->dump_graph) { | |
263 | char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph); | |
264 | fputs(dump, stderr); | |
265 | fflush(stderr); | |
266 | av_free(dump); | |
267 | } | |
268 | ||
269 | /* fill each stream with the information in the corresponding sink */ | |
270 | for (i = 0; i < avctx->nb_streams; i++) { | |
271 | AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0]; | |
272 | AVStream *st = avctx->streams[i]; | |
273 | st->codec->codec_type = link->type; | |
274 | avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den); | |
275 | if (link->type == AVMEDIA_TYPE_VIDEO) { | |
276 | st->codec->codec_id = AV_CODEC_ID_RAWVIDEO; | |
277 | st->codec->pix_fmt = link->format; | |
278 | st->codec->time_base = link->time_base; | |
279 | st->codec->width = link->w; | |
280 | st->codec->height = link->h; | |
281 | st ->sample_aspect_ratio = | |
282 | st->codec->sample_aspect_ratio = link->sample_aspect_ratio; | |
283 | avctx->probesize = FFMAX(avctx->probesize, | |
284 | link->w * link->h * | |
285 | av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(link->format)) * | |
286 | 30); | |
287 | } else if (link->type == AVMEDIA_TYPE_AUDIO) { | |
288 | st->codec->codec_id = av_get_pcm_codec(link->format, -1); | |
289 | st->codec->channels = avfilter_link_get_channels(link); | |
290 | st->codec->sample_fmt = link->format; | |
291 | st->codec->sample_rate = link->sample_rate; | |
292 | st->codec->time_base = link->time_base; | |
293 | st->codec->channel_layout = link->channel_layout; | |
294 | if (st->codec->codec_id == AV_CODEC_ID_NONE) | |
295 | av_log(avctx, AV_LOG_ERROR, | |
296 | "Could not find PCM codec for sample format %s.\n", | |
297 | av_get_sample_fmt_name(link->format)); | |
298 | } | |
299 | } | |
300 | ||
301 | if (!(lavfi->decoded_frame = av_frame_alloc())) | |
302 | FAIL(AVERROR(ENOMEM)); | |
303 | ||
304 | end: | |
305 | av_free(pix_fmts); | |
306 | avfilter_inout_free(&input_links); | |
307 | avfilter_inout_free(&output_links); | |
308 | if (ret < 0) | |
309 | lavfi_read_close(avctx); | |
310 | return ret; | |
311 | } | |
312 | ||
313 | static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt) | |
314 | { | |
315 | LavfiContext *lavfi = avctx->priv_data; | |
316 | double min_pts = DBL_MAX; | |
317 | int stream_idx, min_pts_sink_idx = 0; | |
318 | AVFrame *frame = lavfi->decoded_frame; | |
319 | AVPicture pict; | |
320 | AVDictionary *frame_metadata; | |
321 | int ret, i; | |
322 | int size = 0; | |
323 | ||
324 | /* iterate through all the graph sinks. Select the sink with the | |
325 | * minimum PTS */ | |
326 | for (i = 0; i < avctx->nb_streams; i++) { | |
327 | AVRational tb = lavfi->sinks[i]->inputs[0]->time_base; | |
328 | double d; | |
329 | int ret; | |
330 | ||
331 | if (lavfi->sink_eof[i]) | |
332 | continue; | |
333 | ||
334 | ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame, | |
335 | AV_BUFFERSINK_FLAG_PEEK); | |
336 | if (ret == AVERROR_EOF) { | |
337 | av_dlog(avctx, "EOF sink_idx:%d\n", i); | |
338 | lavfi->sink_eof[i] = 1; | |
339 | continue; | |
340 | } else if (ret < 0) | |
341 | return ret; | |
342 | d = av_rescale_q(frame->pts, tb, AV_TIME_BASE_Q); | |
343 | av_dlog(avctx, "sink_idx:%d time:%f\n", i, d); | |
344 | av_frame_unref(frame); | |
345 | ||
346 | if (d < min_pts) { | |
347 | min_pts = d; | |
348 | min_pts_sink_idx = i; | |
349 | } | |
350 | } | |
351 | if (min_pts == DBL_MAX) | |
352 | return AVERROR_EOF; | |
353 | ||
354 | av_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx); | |
355 | ||
356 | av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0); | |
357 | stream_idx = lavfi->sink_stream_map[min_pts_sink_idx]; | |
358 | ||
359 | if (frame->width /* FIXME best way of testing a video */) { | |
360 | size = avpicture_get_size(frame->format, frame->width, frame->height); | |
361 | if ((ret = av_new_packet(pkt, size)) < 0) | |
362 | return ret; | |
363 | ||
364 | memcpy(pict.data, frame->data, 4*sizeof(frame->data[0])); | |
365 | memcpy(pict.linesize, frame->linesize, 4*sizeof(frame->linesize[0])); | |
366 | ||
367 | avpicture_layout(&pict, frame->format, frame->width, frame->height, | |
368 | pkt->data, size); | |
369 | } else if (av_frame_get_channels(frame) /* FIXME test audio */) { | |
370 | size = frame->nb_samples * av_get_bytes_per_sample(frame->format) * | |
371 | av_frame_get_channels(frame); | |
372 | if ((ret = av_new_packet(pkt, size)) < 0) | |
373 | return ret; | |
374 | memcpy(pkt->data, frame->data[0], size); | |
375 | } | |
376 | ||
377 | frame_metadata = av_frame_get_metadata(frame); | |
378 | if (frame_metadata) { | |
379 | uint8_t *metadata; | |
380 | AVDictionaryEntry *e = NULL; | |
381 | AVBPrint meta_buf; | |
382 | ||
383 | av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED); | |
384 | while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) { | |
385 | av_bprintf(&meta_buf, "%s", e->key); | |
386 | av_bprint_chars(&meta_buf, '\0', 1); | |
387 | av_bprintf(&meta_buf, "%s", e->value); | |
388 | av_bprint_chars(&meta_buf, '\0', 1); | |
389 | } | |
390 | if (!av_bprint_is_complete(&meta_buf) || | |
391 | !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA, | |
392 | meta_buf.len))) { | |
393 | av_bprint_finalize(&meta_buf, NULL); | |
394 | return AVERROR(ENOMEM); | |
395 | } | |
396 | memcpy(metadata, meta_buf.str, meta_buf.len); | |
397 | av_bprint_finalize(&meta_buf, NULL); | |
398 | } | |
399 | ||
400 | pkt->stream_index = stream_idx; | |
401 | pkt->pts = frame->pts; | |
402 | pkt->pos = av_frame_get_pkt_pos(frame); | |
403 | pkt->size = size; | |
404 | av_frame_unref(frame); | |
405 | return size; | |
406 | } | |
407 | ||
408 | #define OFFSET(x) offsetof(LavfiContext, x) | |
409 | ||
410 | #define DEC AV_OPT_FLAG_DECODING_PARAM | |
411 | ||
412 | static const AVOption options[] = { | |
413 | { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, | |
414 | { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC}, | |
415 | { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, | |
416 | { NULL }, | |
417 | }; | |
418 | ||
419 | static const AVClass lavfi_class = { | |
420 | .class_name = "lavfi indev", | |
421 | .item_name = av_default_item_name, | |
422 | .option = options, | |
423 | .version = LIBAVUTIL_VERSION_INT, | |
424 | .category = AV_CLASS_CATEGORY_DEVICE_INPUT, | |
425 | }; | |
426 | ||
427 | AVInputFormat ff_lavfi_demuxer = { | |
428 | .name = "lavfi", | |
429 | .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"), | |
430 | .priv_data_size = sizeof(LavfiContext), | |
431 | .read_header = lavfi_read_header, | |
432 | .read_packet = lavfi_read_packet, | |
433 | .read_close = lavfi_read_close, | |
434 | .flags = AVFMT_NOFILE, | |
435 | .priv_class = &lavfi_class, | |
436 | }; |