FFmpeg: libavdevice/lavfi.c Source File

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libavdevice

lavfi.c

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1 /*

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 */

21 /**

22 * @file

23 * libavfilter virtual input device

24 */

26 /* #define DEBUG */

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/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"

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 int *sink_stream_subcc_map;

55 AVFrame *decoded_frame;

56 int nb_sinks;

57 AVPacket subcc_packet;

58 } LavfiContext;

60 static int *create_all_formats(int n)

61 {

62 int i, j, *fmts, count = 0;

64 for (i = 0; i < n; i++) {

65 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);

66 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))

67 count++;

68 }

70 if (!(fmts = av_malloc((count+1) * sizeof(int))))

71 return NULL;

72 for (j = 0, i = 0; i < n; i++) {

73 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);

74 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))

75 fmts[j++] = i;

76 }

77 fmts[j] = -1;

78 return fmts;

79 }

81 av_cold static int lavfi_read_close(AVFormatContext *avctx)

82 {

83 LavfiContext *lavfi = avctx->priv_data;

85 av_freep(&lavfi->sink_stream_map);

86 av_freep(&lavfi->sink_eof);

87 av_freep(&lavfi->stream_sink_map);

88 av_freep(&lavfi->sink_stream_subcc_map);

89 av_freep(&lavfi->sinks);

90 avfilter_graph_free(&lavfi->graph);

91 av_frame_free(&lavfi->decoded_frame);

93 return 0;

94 }

96 static int create_subcc_streams(AVFormatContext *avctx)

97 {

98 LavfiContext *lavfi = avctx->priv_data;

99 AVStream *st;

100 int stream_idx, sink_idx;

101

102 for (stream_idx = 0; stream_idx < lavfi->nb_sinks; stream_idx++) {

103 sink_idx = lavfi->stream_sink_map[stream_idx];

104 if (lavfi->sink_stream_subcc_map[sink_idx]) {

105 lavfi->sink_stream_subcc_map[sink_idx] = avctx->nb_streams;

106 if (!(st = avformat_new_stream(avctx, NULL)))

107 return AVERROR(ENOMEM);

108 st->codec->codec_id = AV_CODEC_ID_EIA_608;

109 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;

110 } else {

111 lavfi->sink_stream_subcc_map[sink_idx] = -1;

112 }

113 }

114 return 0;

115 }

116

117 av_cold static int lavfi_read_header(AVFormatContext *avctx)

118 {

119 LavfiContext *lavfi = avctx->priv_data;

120 AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;

121 AVFilter *buffersink, *abuffersink;

122 int *pix_fmts = create_all_formats(AV_PIX_FMT_NB);

123 enum AVMediaType type;

124 int ret = 0, i, n;

125

126 #define FAIL(ERR) { ret = ERR; goto end; }

127

128 if (!pix_fmts)

129 FAIL(AVERROR(ENOMEM));

130

131 avfilter_register_all();

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 ret = avio_open(&avio, lavfi->graph_filename, AVIO_FLAG_READ);

146 if (ret < 0)

147 goto end;

148 av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);

149 ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX);

150 avio_closep(&avio);

151 av_bprint_chars(&graph_file_pb, '0円', 1);

152 if (!ret && !av_bprint_is_complete(&graph_file_pb))

153 ret = AVERROR(ENOMEM);

154 if (ret) {

155 av_bprint_finalize(&graph_file_pb, NULL);

156 goto end;

157 }

158 if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))

159 goto end;

160 }

161

162 if (!lavfi->graph_str)

163 lavfi->graph_str = av_strdup(avctx->filename);

164

165 /* parse the graph, create a stream for each open output */

166 if (!(lavfi->graph = avfilter_graph_alloc()))

167 FAIL(AVERROR(ENOMEM));

168

169 if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,

170 &input_links, &output_links, avctx)) < 0)

171 goto end;

172

173 if (input_links) {

174 av_log(avctx, AV_LOG_ERROR,

175 "Open inputs in the filtergraph are not acceptable\n");

176 FAIL(AVERROR(EINVAL));

177 }

178

179 /* count the outputs */

180 for (n = 0, inout = output_links; inout; n++, inout = inout->next);

181 lavfi->nb_sinks = n;

182

183 if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))

184 FAIL(AVERROR(ENOMEM));

185 if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))

186 FAIL(AVERROR(ENOMEM));

187 if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))

188 FAIL(AVERROR(ENOMEM));

189 if (!(lavfi->sink_stream_subcc_map = av_malloc(sizeof(int) * n)))

190 FAIL(AVERROR(ENOMEM));

191

192 for (i = 0; i < n; i++)

193 lavfi->stream_sink_map[i] = -1;

194

195 /* parse the output link names - they need to be of the form out0, out1, ...

196 * create a mapping between them and the streams */

197 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {

198 int stream_idx = 0, suffix = 0, use_subcc = 0;

199 sscanf(inout->name, "out%n%d%n", &suffix, &stream_idx, &suffix);

200 if (!suffix) {

201 av_log(avctx, AV_LOG_ERROR,

202 "Invalid outpad name '%s'\n", inout->name);

203 FAIL(AVERROR(EINVAL));

204 }

205 if (inout->name[suffix]) {

206 if (!strcmp(inout->name + suffix, "+subcc")) {

207 use_subcc = 1;

208 } else {

209 av_log(avctx, AV_LOG_ERROR,

210 "Invalid outpad suffix '%s'\n", inout->name);

211 FAIL(AVERROR(EINVAL));

212 }

213 }

214

215 if ((unsigned)stream_idx >= n) {

216 av_log(avctx, AV_LOG_ERROR,

217 "Invalid index was specified in output '%s', "

218 "must be a non-negative value < %d\n",

219 inout->name, n);

220 FAIL(AVERROR(EINVAL));

221 }

222

223 if (lavfi->stream_sink_map[stream_idx] != -1) {

224 av_log(avctx, AV_LOG_ERROR,

225 "An output with stream index %d was already specified\n",

226 stream_idx);

227 FAIL(AVERROR(EINVAL));

228 }

229 lavfi->sink_stream_map[i] = stream_idx;

230 lavfi->stream_sink_map[stream_idx] = i;

231 lavfi->sink_stream_subcc_map[i] = !!use_subcc;

232 }

233

234 /* for each open output create a corresponding stream */

235 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {

236 AVStream *st;

237 if (!(st = avformat_new_stream(avctx, NULL)))

238 FAIL(AVERROR(ENOMEM));

239 st->id = i;

240 }

241

242 /* create a sink for each output and connect them to the graph */

243 lavfi->sinks = av_malloc_array(lavfi->nb_sinks, sizeof(AVFilterContext *));

244 if (!lavfi->sinks)

245 FAIL(AVERROR(ENOMEM));

246

247 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {

248 AVFilterContext *sink;

249

250 type = inout->filter_ctx->output_pads[inout->pad_idx].type;

251

252 if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||

253 type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {

254 av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");

255 FAIL(AVERROR_FILTER_NOT_FOUND);

256 }

257

258 if (type == AVMEDIA_TYPE_VIDEO) {

259 ret = avfilter_graph_create_filter(&sink, buffersink,

260 inout->name, NULL,

261 NULL, lavfi->graph);

262 if (ret >= 0)

263 ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);

264 if (ret < 0)

265 goto end;

266 } else if (type == AVMEDIA_TYPE_AUDIO) {

267 enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8,

268 AV_SAMPLE_FMT_S16,

269 AV_SAMPLE_FMT_S32,

270 AV_SAMPLE_FMT_FLT,

271 AV_SAMPLE_FMT_DBL, -1 };

272

273 ret = avfilter_graph_create_filter(&sink, abuffersink,

274 inout->name, NULL,

275 NULL, lavfi->graph);

276 if (ret >= 0)

277 ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);

278 if (ret < 0)

279 goto end;

280 ret = av_opt_set_int(sink, "all_channel_counts", 1,

281 AV_OPT_SEARCH_CHILDREN);

282 if (ret < 0)

283 goto end;

284 } else {

285 av_log(avctx, AV_LOG_ERROR,

286 "Output '%s' is not a video or audio output, not yet supported\n", inout->name);

287 FAIL(AVERROR(EINVAL));

288 }

289

290 lavfi->sinks[i] = sink;

291 if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)

292 goto end;

293 }

294

295 /* configure the graph */

296 if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)

297 goto end;

298

299 if (lavfi->dump_graph) {

300 char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);

301 fputs(dump, stderr);

302 fflush(stderr);

303 av_free(dump);

304 }

305

306 /* fill each stream with the information in the corresponding sink */

307 for (i = 0; i < lavfi->nb_sinks; i++) {

308 AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0];

309 AVStream *st = avctx->streams[i];

310 st->codec->codec_type = link->type;

311 avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den);

312 if (link->type == AVMEDIA_TYPE_VIDEO) {

313 st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;

314 st->codec->pix_fmt = link->format;

315 st->codec->time_base = link->time_base;

316 st->codec->width = link->w;

317 st->codec->height = link->h;

318 st ->sample_aspect_ratio =

319 st->codec->sample_aspect_ratio = link->sample_aspect_ratio;

320 avctx->probesize = FFMAX(avctx->probesize,

321 link->w * link->h *

322 av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(link->format)) *

323 30);

324 } else if (link->type == AVMEDIA_TYPE_AUDIO) {

325 st->codec->codec_id = av_get_pcm_codec(link->format, -1);

326 st->codec->channels = avfilter_link_get_channels(link);

327 st->codec->sample_fmt = link->format;

328 st->codec->sample_rate = link->sample_rate;

329 st->codec->time_base = link->time_base;

330 st->codec->channel_layout = link->channel_layout;

331 if (st->codec->codec_id == AV_CODEC_ID_NONE)

332 av_log(avctx, AV_LOG_ERROR,

333 "Could not find PCM codec for sample format %s.\n",

334 av_get_sample_fmt_name(link->format));

335 }

336 }

337

338 if ((ret = create_subcc_streams(avctx)) < 0)

339 FAIL(ret);

340

341 if (!(lavfi->decoded_frame = av_frame_alloc()))

342 FAIL(AVERROR(ENOMEM));

343

344 end:

345 av_free(pix_fmts);

346 avfilter_inout_free(&input_links);

347 avfilter_inout_free(&output_links);

348 if (ret < 0)

349 lavfi_read_close(avctx);

350 return ret;

351 }

352

353 static int create_subcc_packet(AVFormatContext *avctx, AVFrame *frame,

354 int sink_idx)

355 {

356 LavfiContext *lavfi = avctx->priv_data;

357 AVFrameSideData *sd;

358 int stream_idx, i, ret;

359

360 if ((stream_idx = lavfi->sink_stream_subcc_map[sink_idx]) < 0)

361 return 0;

362 for (i = 0; i < frame->nb_side_data; i++)

363 if (frame->side_data[i]->type == AV_FRAME_DATA_A53_CC)

364 break;

365 if (i >= frame->nb_side_data)

366 return 0;

367 sd = frame->side_data[i];

368 if ((ret = av_new_packet(&lavfi->subcc_packet, sd->size)) < 0)

369 return ret;

370 memcpy(lavfi->subcc_packet.data, sd->data, sd->size);

371 lavfi->subcc_packet.stream_index = stream_idx;

372 lavfi->subcc_packet.pts = frame->pts;

373 lavfi->subcc_packet.pos = av_frame_get_pkt_pos(frame);

374 return 0;

375 }

376

377 static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)

378 {

379 LavfiContext *lavfi = avctx->priv_data;

380 double min_pts = DBL_MAX;

381 int stream_idx, min_pts_sink_idx = 0;

382 AVFrame *frame = lavfi->decoded_frame;

383 AVPicture pict;

384 AVDictionary *frame_metadata;

385 int ret, i;

386 int size = 0;

387

388 if (lavfi->subcc_packet.size) {

389 *pkt = lavfi->subcc_packet;

390 av_init_packet(&lavfi->subcc_packet);

391 lavfi->subcc_packet.size = 0;

392 lavfi->subcc_packet.data = NULL;

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 = lavfi->sinks[i]->inputs[0]->time_base;

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 av_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(frame->pts, tb, AV_TIME_BASE_Q);

415 av_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 av_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

431 if (frame->width /* FIXME best way of testing a video */) {

432 size = avpicture_get_size(frame->format, frame->width, frame->height);

433 if ((ret = av_new_packet(pkt, size)) < 0)

434 return ret;

435

436 memcpy(pict.data, frame->data, 4*sizeof(frame->data[0]));

437 memcpy(pict.linesize, frame->linesize, 4*sizeof(frame->linesize[0]));

438

439 avpicture_layout(&pict, frame->format, frame->width, frame->height,

440 pkt->data, size);

441 } else if (av_frame_get_channels(frame) /* FIXME test audio */) {

442 size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *

443 av_frame_get_channels(frame);

444 if ((ret = av_new_packet(pkt, size)) < 0)

445 return ret;

446 memcpy(pkt->data, frame->data[0], size);

447 }

448

449 frame_metadata = av_frame_get_metadata(frame);

450 if (frame_metadata) {

451 uint8_t *metadata;

452 AVDictionaryEntry *e = NULL;

453 AVBPrint meta_buf;

454

455 av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED);

456 while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {

457 av_bprintf(&meta_buf, "%s", e->key);

458 av_bprint_chars(&meta_buf, '0円', 1);

459 av_bprintf(&meta_buf, "%s", e->value);

460 av_bprint_chars(&meta_buf, '0円', 1);

461 }

462 if (!av_bprint_is_complete(&meta_buf) ||

463 !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,

464 meta_buf.len))) {

465 av_bprint_finalize(&meta_buf, NULL);

466 return AVERROR(ENOMEM);

467 }

468 memcpy(metadata, meta_buf.str, meta_buf.len);

469 av_bprint_finalize(&meta_buf, NULL);

470 }

471

472 if ((ret = create_subcc_packet(avctx, frame, min_pts_sink_idx)) < 0) {

473 av_frame_unref(frame);

474 av_packet_unref(pkt);

475 return ret;

476 }

477

478 pkt->stream_index = stream_idx;

479 pkt->pts = frame->pts;

480 pkt->pos = av_frame_get_pkt_pos(frame);

481 pkt->size = size;

482 av_frame_unref(frame);

483 return size;

484 }

485

486 #define OFFSET(x) offsetof(LavfiContext, x)

487

488 #define DEC AV_OPT_FLAG_DECODING_PARAM

489

490 static const AVOption options[] = {

491 { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },

492 { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},

493 { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },

494 { NULL },

495 };

496

497 static const AVClass lavfi_class = {

498 .class_name = "lavfi indev",

499 .item_name = av_default_item_name,

500 .option = options,

501 .version = LIBAVUTIL_VERSION_INT,

502 .category = AV_CLASS_CATEGORY_DEVICE_INPUT,

503 };

504

505 AVInputFormat ff_lavfi_demuxer = {

506 .name = "lavfi",

507 .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),

508 .priv_data_size = sizeof(LavfiContext),

509 .read_header = lavfi_read_header,

510 .read_packet = lavfi_read_packet,

511 .read_close = lavfi_read_close,

512 .flags = AVFMT_NOFILE,

513 .priv_class = &lavfi_class,

514 };

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