FFmpeg: libavfilter/src_movie.c Source File

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libavfilter

src_movie.c

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1 /*

4 *

5 * This file is part of FFmpeg.

6 *

7 * FFmpeg is free software; you can redistribute it and/or

8 * modify it under the terms of the GNU Lesser General Public

9 * License as published by the Free Software Foundation; either

10 * version 2.1 of the License, or (at your option) any later version.

11 *

12 * FFmpeg is distributed in the hope that it will be useful,

13 * but WITHOUT ANY WARRANTY; without even the implied warranty of

14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

15 * Lesser General Public License for more details.

16 *

17 * You should have received a copy of the GNU Lesser General Public

18 * License along with FFmpeg; if not, write to the Free Software

19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

20 */

22 /**

23 * @file

24 * movie video source

25 *

26 * @todo use direct rendering (no allocation of a new frame)

27 * @todo support a PTS correction mechanism

28 */

30 #include <float.h>

32 #include "libavutil/attributes.h"

33 #include "libavutil/avstring.h"

34 #include "libavutil/avassert.h"

35 #include "libavutil/opt.h"

36 #include "libavutil/imgutils.h"

37 #include "libavutil/timestamp.h"

38 #include "libavformat/avformat.h"

39 #include "audio.h"

40 #include "avcodec.h"

41 #include "avfilter.h"

42 #include "formats.h"

43 #include "internal.h"

44 #include "video.h"

46 typedef struct {

47 AVStream *st;

48 int done;

49 } MovieStream;

51 typedef struct {

52 /* common A/V fields */

53 const AVClass *class;

54 int64_t seek_point; ///< seekpoint in microseconds

55 double seek_point_d;

56 char *format_name;

57 char *file_name;

58 char *stream_specs; /**< user-provided list of streams, separated by + */

59 int stream_index; /**< for compatibility */

60 int loop_count;

62 AVFormatContext *format_ctx;

63 int eof;

64 AVPacket pkt, pkt0;

65 AVFrame *frame; ///< video frame to store the decoded images in

67 int max_stream_index; /**< max stream # actually used for output */

68 MovieStream *st; /**< array of all streams, one per output */

69 int *out_index; /**< stream number -> output number map, or -1 */

70 } MovieContext;

72 #define OFFSET(x) offsetof(MovieContext, x)

73 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM

75 static const AVOption movie_options[]= {

76 { "filename", NULL, OFFSET(file_name), AV_OPT_TYPE_STRING, .flags = FLAGS },

77 { "format_name", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, .flags = FLAGS },

78 { "f", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, .flags = FLAGS },

79 { "stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },

80 { "si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },

81 { "seek_point", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, (INT64_MAX-1) / 1000000, FLAGS },

82 { "sp", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, (INT64_MAX-1) / 1000000, FLAGS },

83 { "streams", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX, FLAGS },

84 { "s", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX, FLAGS },

85 { "loop", "set loop count", OFFSET(loop_count), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, FLAGS },

86 { NULL },

87 };

89 static int movie_config_output_props(AVFilterLink *outlink);

90 static int movie_request_frame(AVFilterLink *outlink);

92 static AVStream *find_stream(void *log, AVFormatContext *avf, const char *spec)

93 {

94 int i, ret, already = 0, stream_id = -1;

95 char type_char[2], dummy;

96 AVStream *found = NULL;

97 enum AVMediaType type;

99 ret = sscanf(spec, "d%1[av]%d%c", type_char, &stream_id, &dummy);

100 if (ret >= 1 && ret <= 2) {

101 type = type_char[0] == 'v' ? AVMEDIA_TYPE_VIDEO : AVMEDIA_TYPE_AUDIO;

102 ret = av_find_best_stream(avf, type, stream_id, -1, NULL, 0);

103 if (ret < 0) {

104 av_log(log, AV_LOG_ERROR, "No %s stream with index '%d' found\n",

105 av_get_media_type_string(type), stream_id);

106 return NULL;

107 }

108 return avf->streams[ret];

109 }

110 for (i = 0; i < avf->nb_streams; i++) {

111 ret = avformat_match_stream_specifier(avf, avf->streams[i], spec);

112 if (ret < 0) {

113 av_log(log, AV_LOG_ERROR,

114 "Invalid stream specifier \"%s\"\n", spec);

115 return NULL;

116 }

117 if (!ret)

118 continue;

119 if (avf->streams[i]->discard != AVDISCARD_ALL) {

120 already++;

121 continue;

122 }

123 if (found) {

124 av_log(log, AV_LOG_WARNING,

125 "Ambiguous stream specifier \"%s\", using #%d\n", spec, i);

126 break;

127 }

128 found = avf->streams[i];

129 }

130 if (!found) {

131 av_log(log, AV_LOG_WARNING, "Stream specifier \"%s\" %s\n", spec,

132 already ? "matched only already used streams" :

133 "did not match any stream");

134 return NULL;

135 }

136 if (found->codec->codec_type != AVMEDIA_TYPE_VIDEO &&

137 found->codec->codec_type != AVMEDIA_TYPE_AUDIO) {

138 av_log(log, AV_LOG_ERROR, "Stream specifier \"%s\" matched a %s stream,"

139 "currently unsupported by libavfilter\n", spec,

140 av_get_media_type_string(found->codec->codec_type));

141 return NULL;

142 }

143 return found;

144 }

145

146 static int open_stream(void *log, MovieStream *st)

147 {

148 AVCodec *codec;

149 int ret;

150

151 codec = avcodec_find_decoder(st->st->codec->codec_id);

152 if (!codec) {

153 av_log(log, AV_LOG_ERROR, "Failed to find any codec\n");

154 return AVERROR(EINVAL);

155 }

156

157 st->st->codec->refcounted_frames = 1;

158

159 if ((ret = avcodec_open2(st->st->codec, codec, NULL)) < 0) {

160 av_log(log, AV_LOG_ERROR, "Failed to open codec\n");

161 return ret;

162 }

163

164 return 0;

165 }

166

167 static int guess_channel_layout(MovieStream *st, int st_index, void *log_ctx)

168 {

169 AVCodecContext *dec_ctx = st->st->codec;

170 char buf[256];

171 int64_t chl = av_get_default_channel_layout(dec_ctx->channels);

172

173 if (!chl) {

174 av_log(log_ctx, AV_LOG_ERROR,

175 "Channel layout is not set in stream %d, and could not "

176 "be guessed from the number of channels (%d)\n",

177 st_index, dec_ctx->channels);

178 return AVERROR(EINVAL);

179 }

180

181 av_get_channel_layout_string(buf, sizeof(buf), dec_ctx->channels, chl);

182 av_log(log_ctx, AV_LOG_WARNING,

183 "Channel layout is not set in output stream %d, "

184 "guessed channel layout is '%s'\n",

185 st_index, buf);

186 dec_ctx->channel_layout = chl;

187 return 0;

188 }

189

190 static av_cold int movie_common_init(AVFilterContext *ctx)

191 {

192 MovieContext *movie = ctx->priv;

193 AVInputFormat *iformat = NULL;

194 int64_t timestamp;

195 int nb_streams, ret, i;

196 char default_streams[16], *stream_specs, *spec, *cursor;

197 char name[16];

198 AVStream *st;

199

200 if (!movie->file_name) {

201 av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");

202 return AVERROR(EINVAL);

203 }

204

205 movie->seek_point = movie->seek_point_d * 1000000 + 0.5;

206

207 stream_specs = movie->stream_specs;

208 if (!stream_specs) {

209 snprintf(default_streams, sizeof(default_streams), "d%c%d",

210 !strcmp(ctx->filter->name, "amovie") ? 'a' : 'v',

211 movie->stream_index);

212 stream_specs = default_streams;

213 }

214 for (cursor = stream_specs, nb_streams = 1; *cursor; cursor++)

215 if (*cursor == '+')

216 nb_streams++;

217

218 if (movie->loop_count != 1 && nb_streams != 1) {

219 av_log(ctx, AV_LOG_ERROR,

220 "Loop with several streams is currently unsupported\n");

221 return AVERROR_PATCHWELCOME;

222 }

223

224 av_register_all();

225

226 // Try to find the movie format (container)

227 iformat = movie->format_name ? av_find_input_format(movie->format_name) : NULL;

228

229 movie->format_ctx = NULL;

230 if ((ret = avformat_open_input(&movie->format_ctx, movie->file_name, iformat, NULL)) < 0) {

231 av_log(ctx, AV_LOG_ERROR,

232 "Failed to avformat_open_input '%s'\n", movie->file_name);

233 return ret;

234 }

235 if ((ret = avformat_find_stream_info(movie->format_ctx, NULL)) < 0)

236 av_log(ctx, AV_LOG_WARNING, "Failed to find stream info\n");

237

238 // if seeking requested, we execute it

239 if (movie->seek_point > 0) {

240 timestamp = movie->seek_point;

241 // add the stream start time, should it exist

242 if (movie->format_ctx->start_time != AV_NOPTS_VALUE) {

243 if (timestamp > INT64_MAX - movie->format_ctx->start_time) {

244 av_log(ctx, AV_LOG_ERROR,

245 "%s: seek value overflow with start_time:%"PRId64" seek_point:%"PRId64"\n",

246 movie->file_name, movie->format_ctx->start_time, movie->seek_point);

247 return AVERROR(EINVAL);

248 }

249 timestamp += movie->format_ctx->start_time;

250 }

251 if ((ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD)) < 0) {

252 av_log(ctx, AV_LOG_ERROR, "%s: could not seek to position %"PRId64"\n",

253 movie->file_name, timestamp);

254 return ret;

255 }

256 }

257

258 for (i = 0; i < movie->format_ctx->nb_streams; i++)

259 movie->format_ctx->streams[i]->discard = AVDISCARD_ALL;

260

261 movie->st = av_calloc(nb_streams, sizeof(*movie->st));

262 if (!movie->st)

263 return AVERROR(ENOMEM);

264

265 for (i = 0; i < nb_streams; i++) {

266 spec = av_strtok(stream_specs, "+", &cursor);

267 if (!spec)

268 return AVERROR_BUG;

269 stream_specs = NULL; /* for next strtok */

270 st = find_stream(ctx, movie->format_ctx, spec);

271 if (!st)

272 return AVERROR(EINVAL);

273 st->discard = AVDISCARD_DEFAULT;

274 movie->st[i].st = st;

275 movie->max_stream_index = FFMAX(movie->max_stream_index, st->index);

276 }

277 if (av_strtok(NULL, "+", &cursor))

278 return AVERROR_BUG;

279

280 movie->out_index = av_calloc(movie->max_stream_index + 1,

281 sizeof(*movie->out_index));

282 if (!movie->out_index)

283 return AVERROR(ENOMEM);

284 for (i = 0; i <= movie->max_stream_index; i++)

285 movie->out_index[i] = -1;

286 for (i = 0; i < nb_streams; i++)

287 movie->out_index[movie->st[i].st->index] = i;

288

289 for (i = 0; i < nb_streams; i++) {

290 AVFilterPad pad = { 0 };

291 snprintf(name, sizeof(name), "out%d", i);

292 pad.type = movie->st[i].st->codec->codec_type;

293 pad.name = av_strdup(name);

294 pad.config_props = movie_config_output_props;

295 pad.request_frame = movie_request_frame;

296 ff_insert_outpad(ctx, i, &pad);

297 ret = open_stream(ctx, &movie->st[i]);

298 if (ret < 0)

299 return ret;

300 if ( movie->st[i].st->codec->codec->type == AVMEDIA_TYPE_AUDIO &&

301 !movie->st[i].st->codec->channel_layout) {

302 ret = guess_channel_layout(&movie->st[i], i, ctx);

303 if (ret < 0)

304 return ret;

305 }

306 }

307

308 av_log(ctx, AV_LOG_VERBOSE, "seek_point:%"PRIi64" format_name:%s file_name:%s stream_index:%d\n",

309 movie->seek_point, movie->format_name, movie->file_name,

310 movie->stream_index);

311

312 return 0;

313 }

314

315 static av_cold void movie_uninit(AVFilterContext *ctx)

316 {

317 MovieContext *movie = ctx->priv;

318 int i;

319

320 for (i = 0; i < ctx->nb_outputs; i++) {

321 av_freep(&ctx->output_pads[i].name);

322 if (movie->st[i].st)

323 avcodec_close(movie->st[i].st->codec);

324 }

325 av_freep(&movie->st);

326 av_freep(&movie->out_index);

327 av_frame_free(&movie->frame);

328 if (movie->format_ctx)

329 avformat_close_input(&movie->format_ctx);

330 }

331

332 static int movie_query_formats(AVFilterContext *ctx)

333 {

334 MovieContext *movie = ctx->priv;

335 int list[] = { 0, -1 };

336 int64_t list64[] = { 0, -1 };

337 int i;

338

339 for (i = 0; i < ctx->nb_outputs; i++) {

340 MovieStream *st = &movie->st[i];

341 AVCodecContext *c = st->st->codec;

342 AVFilterLink *outlink = ctx->outputs[i];

343

344 switch (c->codec_type) {

345 case AVMEDIA_TYPE_VIDEO:

346 list[0] = c->pix_fmt;

347 ff_formats_ref(ff_make_format_list(list), &outlink->in_formats);

348 break;

349 case AVMEDIA_TYPE_AUDIO:

350 list[0] = c->sample_fmt;

351 ff_formats_ref(ff_make_format_list(list), &outlink->in_formats);

352 list[0] = c->sample_rate;

353 ff_formats_ref(ff_make_format_list(list), &outlink->in_samplerates);

354 list64[0] = c->channel_layout;

355 ff_channel_layouts_ref(avfilter_make_format64_list(list64),

356 &outlink->in_channel_layouts);

357 break;

358 }

359 }

360

361 return 0;

362 }

363

364 static int movie_config_output_props(AVFilterLink *outlink)

365 {

366 AVFilterContext *ctx = outlink->src;

367 MovieContext *movie = ctx->priv;

368 unsigned out_id = FF_OUTLINK_IDX(outlink);

369 MovieStream *st = &movie->st[out_id];

370 AVCodecContext *c = st->st->codec;

371

372 outlink->time_base = st->st->time_base;

373

374 switch (c->codec_type) {

375 case AVMEDIA_TYPE_VIDEO:

376 outlink->w = c->width;

377 outlink->h = c->height;

378 outlink->frame_rate = st->st->r_frame_rate;

379 break;

380 case AVMEDIA_TYPE_AUDIO:

381 break;

382 }

383

384 return 0;

385 }

386

387 static char *describe_frame_to_str(char *dst, size_t dst_size,

388 AVFrame *frame,

389 AVFilterLink *link)

390 {

391 switch (frame->type) {

392 case AVMEDIA_TYPE_VIDEO:

393 snprintf(dst, dst_size,

394 "video pts:%s time:%s size:%dx%d aspect:%d/%d",

395 av_ts2str(frame->pts), av_ts2timestr(frame->pts, &link->time_base),

396 frame->width, frame->height,

397 frame->sample_aspect_ratio.num,

398 frame->sample_aspect_ratio.den);

399 break;

400 case AVMEDIA_TYPE_AUDIO:

401 snprintf(dst, dst_size,

402 "audio pts:%s time:%s samples:%d",

403 av_ts2str(frame->pts), av_ts2timestr(frame->pts, &link->time_base),

404 frame->nb_samples);

405 break;

406 default:

407 snprintf(dst, dst_size, "%s BUG", av_get_media_type_string(frame->type));

408 break;

409 }

410 return dst;

411 }

412

413 #define describe_frameref(f, link) \

414 describe_frame_to_str((char[1024]){0}, 1024, f, link)

415

416 static int rewind_file(AVFilterContext *ctx)

417 {

418 MovieContext *movie = ctx->priv;

419 int64_t timestamp = movie->seek_point;

420 int ret, i;

421

422 if (movie->format_ctx->start_time != AV_NOPTS_VALUE)

423 timestamp += movie->format_ctx->start_time;

424 ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD);

425 if (ret < 0) {

426 av_log(ctx, AV_LOG_ERROR, "Unable to loop: %s\n", av_err2str(ret));

427 movie->loop_count = 1; /* do not try again */

428 return ret;

429 }

430

431 for (i = 0; i < ctx->nb_outputs; i++) {

432 avcodec_flush_buffers(movie->st[i].st->codec);

433 movie->st[i].done = 0;

434 }

435 movie->eof = 0;

436 return 0;

437 }

438

439 /**

440 * Try to push a frame to the requested output.

441 *

442 * @param ctx filter context

443 * @param out_id number of output where a frame is wanted;

444 * if the frame is read from file, used to set the return value;

445 * if the codec is being flushed, flush the corresponding stream

446 * @return 1 if a frame was pushed on the requested output,

447 * 0 if another attempt is possible,

448 * <0 AVERROR code

449 */

450 static int movie_push_frame(AVFilterContext *ctx, unsigned out_id)

451 {

452 MovieContext *movie = ctx->priv;

453 AVPacket *pkt = &movie->pkt;

454 MovieStream *st;

455 int ret, got_frame = 0, pkt_out_id;

456 AVFilterLink *outlink;

457

458 if (!pkt->size) {

459 if (movie->eof) {

460 if (movie->st[out_id].done) {

461 if (movie->loop_count != 1) {

462 ret = rewind_file(ctx);

463 if (ret < 0)

464 return ret;

465 movie->loop_count -= movie->loop_count > 1;

466 av_log(ctx, AV_LOG_VERBOSE, "Stream finished, looping.\n");

467 return 0; /* retry */

468 }

469 return AVERROR_EOF;

470 }

471 pkt->stream_index = movie->st[out_id].st->index;

472 /* packet is already ready for flushing */

473 } else {

474 ret = av_read_frame(movie->format_ctx, &movie->pkt0);

475 if (ret < 0) {

476 av_init_packet(&movie->pkt0); /* ready for flushing */

477 *pkt = movie->pkt0;

478 if (ret == AVERROR_EOF) {

479 movie->eof = 1;

480 return 0; /* start flushing */

481 }

482 return ret;

483 }

484 *pkt = movie->pkt0;

485 }

486 }

487

488 pkt_out_id = pkt->stream_index > movie->max_stream_index ? -1 :

489 movie->out_index[pkt->stream_index];

490 if (pkt_out_id < 0) {

491 av_free_packet(&movie->pkt0);

492 pkt->size = 0; /* ready for next run */

493 pkt->data = NULL;

494 return 0;

495 }

496 st = &movie->st[pkt_out_id];

497 outlink = ctx->outputs[pkt_out_id];

498

499 movie->frame = av_frame_alloc();

500 if (!movie->frame)

501 return AVERROR(ENOMEM);

502

503 switch (st->st->codec->codec_type) {

504 case AVMEDIA_TYPE_VIDEO:

505 ret = avcodec_decode_video2(st->st->codec, movie->frame, &got_frame, pkt);

506 break;

507 case AVMEDIA_TYPE_AUDIO:

508 ret = avcodec_decode_audio4(st->st->codec, movie->frame, &got_frame, pkt);

509 break;

510 default:

511 ret = AVERROR(ENOSYS);

512 break;

513 }

514 if (ret < 0) {

515 av_log(ctx, AV_LOG_WARNING, "Decode error: %s\n", av_err2str(ret));

516 av_frame_free(&movie->frame);

517 av_free_packet(&movie->pkt0);

518 movie->pkt.size = 0;

519 movie->pkt.data = NULL;

520 return 0;

521 }

522 if (!ret || st->st->codec->codec_type == AVMEDIA_TYPE_VIDEO)

523 ret = pkt->size;

524

525 pkt->data += ret;

526 pkt->size -= ret;

527 if (pkt->size <= 0) {

528 av_free_packet(&movie->pkt0);

529 pkt->size = 0; /* ready for next run */

530 pkt->data = NULL;

531 }

532 if (!got_frame) {

533 if (!ret)

534 st->done = 1;

535 av_frame_free(&movie->frame);

536 return 0;

537 }

538

539 av_dlog(ctx, "movie_push_frame(): file:'%s' %s\n", movie->file_name,

540 describe_frameref(movie->frame, outlink));

541

542 movie->frame->pts = av_frame_get_best_effort_timestamp(movie->frame);

543 ret = ff_filter_frame(outlink, movie->frame);

544 movie->frame = NULL;

545

546 if (ret < 0)

547 return ret;

548 return pkt_out_id == out_id;

549 }

550

551 static int movie_request_frame(AVFilterLink *outlink)

552 {

553 AVFilterContext *ctx = outlink->src;

554 unsigned out_id = FF_OUTLINK_IDX(outlink);

555 int ret;

556

557 while (1) {

558 ret = movie_push_frame(ctx, out_id);

559 if (ret)

560 return FFMIN(ret, 0);

561 }

562 }

563

564 #if CONFIG_MOVIE_FILTER

565

566 AVFILTER_DEFINE_CLASS(movie);

567

568 AVFilter avfilter_avsrc_movie = {

569 .name = "movie",

570 .description = NULL_IF_CONFIG_SMALL("Read from a movie source."),

571 .priv_size = sizeof(MovieContext),

572 .priv_class = &movie_class,

573 .init = movie_common_init,

574 .uninit = movie_uninit,

575 .query_formats = movie_query_formats,

576

577 .inputs = NULL,

578 .outputs = NULL,

579 .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,

580 };

581

582 #endif /* CONFIG_MOVIE_FILTER */

583

584 #if CONFIG_AMOVIE_FILTER

585

586 #define amovie_options movie_options

587 AVFILTER_DEFINE_CLASS(amovie);

588

589 AVFilter avfilter_avsrc_amovie = {

590 .name = "amovie",

591 .description = NULL_IF_CONFIG_SMALL("Read audio from a movie source."),

592 .priv_size = sizeof(MovieContext),

593 .init = movie_common_init,

594 .uninit = movie_uninit,

595 .query_formats = movie_query_formats,

596

597 .inputs = NULL,

598 .outputs = NULL,

599 .priv_class = &amovie_class,

600 .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,

601 };

602

603 #endif /* CONFIG_AMOVIE_FILTER */

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