aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/src_movie.c
blob: e6e08cdda4e06e966d2588ab5e9bb55b388897d0 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
/*
 * Copyright (c) 2010 Stefano Sabatini
 * Copyright (c) 2008 Victor Paesa
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * movie video source
 *
 * @todo support a PTS correction mechanism
 */

#include "config_components.h"

#include <stdint.h>

#include "libavutil/attributes.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/internal.h"

#include "libavcodec/avcodec.h"

#include "libavformat/avformat.h"

#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

typedef struct MovieStream {
    AVFilterLink *link;
    AVStream *st;
    AVCodecContext *codec_ctx;
    int64_t discontinuity_threshold;
    int64_t last_pts;
    AVFrame *frame;
    int eof;
} MovieStream;

typedef struct MovieContext {
    /* common A/V fields */
    const AVClass *class;
    int64_t seek_point;   ///< seekpoint in microseconds
    double seek_point_d;
    char *format_name;
    char *file_name;
    char *stream_specs; /**< user-provided list of streams, separated by + */
    int stream_index; /**< for compatibility */
    int loop_count;
    int64_t discontinuity_threshold;
    int64_t ts_offset;
    int dec_threads;

    AVPacket *pkt;
    AVFormatContext *format_ctx;

    int eof;
    int max_stream_index; /**< max stream # actually used for output */
    MovieStream *st; /**< array of all streams, one per output */
    int *out_index; /**< stream number -> output number map, or -1 */
    AVDictionary *format_opts;
} MovieContext;

#define OFFSET(x) offsetof(MovieContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM

static const AVOption movie_options[]= {
    { "filename",     NULL,                      OFFSET(file_name),    AV_OPT_TYPE_STRING,                                    .flags = FLAGS },
    { "format_name",  "set format name",         OFFSET(format_name),  AV_OPT_TYPE_STRING,                                    .flags = FLAGS },
    { "f",            "set format name",         OFFSET(format_name),  AV_OPT_TYPE_STRING,                                    .flags = FLAGS },
    { "stream_index", "set stream index",        OFFSET(stream_index), AV_OPT_TYPE_INT,    { .i64 = -1 }, -1, INT_MAX,                 FLAGS  },
    { "si",           "set stream index",        OFFSET(stream_index), AV_OPT_TYPE_INT,    { .i64 = -1 }, -1, INT_MAX,                 FLAGS  },
    { "seek_point",   "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl =  0 },  0, (INT64_MAX-1) / 1000000, FLAGS },
    { "sp",           "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl =  0 },  0, (INT64_MAX-1) / 1000000, FLAGS },
    { "streams",      "set streams",             OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str =  0},  0, 0, FLAGS },
    { "s",            "set streams",             OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str =  0},  0, 0, FLAGS },
    { "loop",         "set loop count",          OFFSET(loop_count),   AV_OPT_TYPE_INT,    {.i64 =  1},  0,        INT_MAX, FLAGS },
    { "discontinuity", "set discontinuity threshold", OFFSET(discontinuity_threshold), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, FLAGS },
    { "dec_threads",  "set the number of threads for decoding", OFFSET(dec_threads), AV_OPT_TYPE_INT, {.i64 =  0}, 0, INT_MAX, FLAGS },
    { "format_opts",  "set format options for the opened file", OFFSET(format_opts), AV_OPT_TYPE_DICT, {.str = NULL}, 0, 0, FLAGS},
    { NULL },
};

static int movie_config_output_props(AVFilterLink *outlink);

static AVStream *find_stream(void *log, AVFormatContext *avf, const char *spec)
{
    int i, ret, already = 0, stream_id = -1;
    char type_char[2], dummy;
    AVStream *found = NULL;
    enum AVMediaType type;

    ret = sscanf(spec, "d%1[av]%d%c", type_char, &stream_id, &dummy);
    if (ret >= 1 && ret <= 2) {
        type = type_char[0] == 'v' ? AVMEDIA_TYPE_VIDEO : AVMEDIA_TYPE_AUDIO;
        ret = av_find_best_stream(avf, type, stream_id, -1, NULL, 0);
        if (ret < 0) {
            av_log(log, AV_LOG_ERROR, "No %s stream with index '%d' found\n",
                   av_get_media_type_string(type), stream_id);
            return NULL;
        }
        return avf->streams[ret];
    }
    for (i = 0; i < avf->nb_streams; i++) {
        ret = avformat_match_stream_specifier(avf, avf->streams[i], spec);
        if (ret < 0) {
            av_log(log, AV_LOG_ERROR,
                   "Invalid stream specifier \"%s\"\n", spec);
            return NULL;
        }
        if (!ret)
            continue;
        if (avf->streams[i]->discard != AVDISCARD_ALL) {
            already++;
            continue;
        }
        if (found) {
            av_log(log, AV_LOG_WARNING,
                   "Ambiguous stream specifier \"%s\", using #%d\n", spec, i);
            break;
        }
        found = avf->streams[i];
    }
    if (!found) {
        av_log(log, AV_LOG_WARNING, "Stream specifier \"%s\" %s\n", spec,
               already ? "matched only already used streams" :
                         "did not match any stream");
        return NULL;
    }
    if (found->codecpar->codec_type != AVMEDIA_TYPE_VIDEO &&
        found->codecpar->codec_type != AVMEDIA_TYPE_AUDIO) {
        av_log(log, AV_LOG_ERROR, "Stream specifier \"%s\" matched a %s stream,"
               "currently unsupported by libavfilter\n", spec,
               av_get_media_type_string(found->codecpar->codec_type));
        return NULL;
    }
    return found;
}

static int get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
{
    int linesize_align[AV_NUM_DATA_POINTERS];
    MovieStream *st = avctx->opaque;
    AVFilterLink *outlink = st->link;
    int w, h, ow, oh, copy = 0;
    AVFrame *new;

    h = oh = frame->height;
    w = ow = frame->width;

    copy = frame->format != outlink->format;
    switch (avctx->codec_type) {
    case AVMEDIA_TYPE_VIDEO:
        if (w != outlink->w || h != outlink->h)
            copy |= 1;
        break;
    case AVMEDIA_TYPE_AUDIO:
        if (outlink->sample_rate != frame->sample_rate ||
            av_channel_layout_compare(&outlink->ch_layout, &frame->ch_layout))
            copy |= 1;
        break;
    }

    if (copy || !(avctx->codec->capabilities & AV_CODEC_CAP_DR1))
        return avcodec_default_get_buffer2(avctx, frame, flags);

    switch (avctx->codec_type) {
    case AVMEDIA_TYPE_VIDEO:
        avcodec_align_dimensions2(avctx, &w, &h, linesize_align);
        new = ff_default_get_video_buffer(outlink, w, h);
        break;
    case AVMEDIA_TYPE_AUDIO:
        new = ff_default_get_audio_buffer(outlink, frame->nb_samples);
        break;
    default:
        return -1;
    }

    av_frame_copy_props(new, frame);
    av_frame_unref(frame);
    av_frame_move_ref(frame, new);
    av_frame_free(&new);

    frame->width  = ow;
    frame->height = oh;

    return 0;
}

static int open_stream(AVFilterContext *ctx, MovieStream *st, int dec_threads)
{
    const AVCodec *codec;
    int ret;

    codec = avcodec_find_decoder(st->st->codecpar->codec_id);
    if (!codec) {
        av_log(ctx, AV_LOG_ERROR, "Failed to find any codec\n");
        return AVERROR(EINVAL);
    }

    st->codec_ctx = avcodec_alloc_context3(codec);
    if (!st->codec_ctx)
        return AVERROR(ENOMEM);

    st->codec_ctx->opaque = st;
    st->codec_ctx->get_buffer2 = get_buffer;
    ret = avcodec_parameters_to_context(st->codec_ctx, st->st->codecpar);
    if (ret < 0)
        return ret;

    if (!dec_threads)
        dec_threads = ff_filter_get_nb_threads(ctx);
    st->codec_ctx->thread_count = dec_threads;

    if ((ret = avcodec_open2(st->codec_ctx, codec, NULL)) < 0) {
        av_log(ctx, AV_LOG_ERROR, "Failed to open codec\n");
        return ret;
    }

    return 0;
}

static int guess_channel_layout(MovieStream *st, int st_index, void *log_ctx)
{
    AVCodecParameters *dec_par = st->st->codecpar;
    char buf[256];
    AVChannelLayout chl = { 0 };

    av_channel_layout_default(&chl, dec_par->ch_layout.nb_channels);

    if (!KNOWN(&chl)) {
        av_log(log_ctx, AV_LOG_WARNING,
               "Channel layout is not set in stream %d, and could not "
               "be guessed from the number of channels (%d)\n",
               st_index, dec_par->ch_layout.nb_channels);
        return av_channel_layout_copy(&dec_par->ch_layout, &chl);
    }

    av_channel_layout_describe(&chl, buf, sizeof(buf));
    av_log(log_ctx, AV_LOG_WARNING,
           "Channel layout is not set in output stream %d, "
           "guessed channel layout is '%s'\n",
           st_index, buf);
    return av_channel_layout_copy(&dec_par->ch_layout, &chl);
}

static av_cold int movie_common_init(AVFilterContext *ctx)
{
    MovieContext *movie = ctx->priv;
    const AVInputFormat *iformat = NULL;
    int64_t timestamp;
    int nb_streams = 1, ret, i;
    char default_streams[16], *stream_specs, *spec, *cursor;
    AVStream *st;

    if (!movie->file_name) {
        av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
        return AVERROR(EINVAL);
    }

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

    stream_specs = movie->stream_specs;
    if (!stream_specs) {
        snprintf(default_streams, sizeof(default_streams), "d%c%d",
                 !strcmp(ctx->filter->name, "amovie") ? 'a' : 'v',
                 movie->stream_index);
        stream_specs = default_streams;
    }
    for (cursor = stream_specs; *cursor; cursor++)
        if (*cursor == '+')
            nb_streams++;

    if (movie->loop_count != 1 && nb_streams != 1) {
        av_log(ctx, AV_LOG_ERROR,
               "Loop with several streams is currently unsupported\n");
        return AVERROR_PATCHWELCOME;
    }

    // Try to find the movie format (container)
    iformat = movie->format_name ? av_find_input_format(movie->format_name) : NULL;

    movie->format_ctx = NULL;
    if ((ret = avformat_open_input(&movie->format_ctx, movie->file_name, iformat, &movie->format_opts)) < 0) {
        av_log(ctx, AV_LOG_ERROR,
               "Failed to avformat_open_input '%s'\n", movie->file_name);
        return ret;
    }
    if ((ret = avformat_find_stream_info(movie->format_ctx, NULL)) < 0)
        av_log(ctx, AV_LOG_WARNING, "Failed to find stream info\n");

    // if seeking requested, we execute it
    if (movie->seek_point > 0) {
        timestamp = movie->seek_point;
        // add the stream start time, should it exist
        if (movie->format_ctx->start_time != AV_NOPTS_VALUE) {
            if (timestamp > 0 && movie->format_ctx->start_time > INT64_MAX - timestamp) {
                av_log(ctx, AV_LOG_ERROR,
                       "%s: seek value overflow with start_time:%"PRId64" seek_point:%"PRId64"\n",
                       movie->file_name, movie->format_ctx->start_time, movie->seek_point);
                return AVERROR(EINVAL);
            }
            timestamp += movie->format_ctx->start_time;
        }
        if ((ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD)) < 0) {
            av_log(ctx, AV_LOG_ERROR, "%s: could not seek to position %"PRId64"\n",
                   movie->file_name, timestamp);
            return ret;
        }
    }

    for (i = 0; i < movie->format_ctx->nb_streams; i++)
        movie->format_ctx->streams[i]->discard = AVDISCARD_ALL;

    movie->pkt = av_packet_alloc();
    if (!movie->pkt)
        return AVERROR(ENOMEM);
    movie->st = av_calloc(nb_streams, sizeof(*movie->st));
    if (!movie->st)
        return AVERROR(ENOMEM);

    for (i = 0; i < nb_streams; i++) {
        spec = av_strtok(stream_specs, "+", &cursor);
        if (!spec)
            return AVERROR_BUG;
        stream_specs = NULL; /* for next strtok */
        st = find_stream(ctx, movie->format_ctx, spec);
        if (!st)
            return AVERROR(EINVAL);
        st->discard = AVDISCARD_DEFAULT;
        movie->st[i].st = st;
        movie->max_stream_index = FFMAX(movie->max_stream_index, st->index);
        movie->st[i].discontinuity_threshold =
            av_rescale_q(movie->discontinuity_threshold, AV_TIME_BASE_Q, st->time_base);

        movie->st[i].frame = av_frame_alloc();
        if (!movie->st[i].frame)
            return AVERROR(ENOMEM);
    }
    if (av_strtok(NULL, "+", &cursor))
        return AVERROR_BUG;

    movie->out_index = av_calloc(movie->max_stream_index + 1,
                                 sizeof(*movie->out_index));
    if (!movie->out_index)
        return AVERROR(ENOMEM);
    for (i = 0; i <= movie->max_stream_index; i++)
        movie->out_index[i] = -1;
    for (i = 0; i < nb_streams; i++) {
        AVFilterPad pad = { 0 };
        movie->out_index[movie->st[i].st->index] = i;
        pad.type          = movie->st[i].st->codecpar->codec_type;
        pad.name          = av_asprintf("out%d", i);
        if (!pad.name)
            return AVERROR(ENOMEM);
        pad.config_props  = movie_config_output_props;
        if ((ret = ff_append_outpad_free_name(ctx, &pad)) < 0)
            return ret;
        if ( movie->st[i].st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
            !KNOWN(&movie->st[i].st->codecpar->ch_layout)) {
            ret = guess_channel_layout(&movie->st[i], i, ctx);
            if (ret < 0)
                return ret;
        }
        ret = open_stream(ctx, &movie->st[i], movie->dec_threads);
        if (ret < 0)
            return ret;
    }

    av_log(ctx, AV_LOG_VERBOSE, "seek_point:%"PRIi64" format_name:%s file_name:%s stream_index:%d\n",
           movie->seek_point, movie->format_name, movie->file_name,
           movie->stream_index);

    return 0;
}

static av_cold void movie_uninit(AVFilterContext *ctx)
{
    MovieContext *movie = ctx->priv;
    int i;

    for (i = 0; i < ctx->nb_outputs; i++) {
        if (movie->st[i].st)
            avcodec_free_context(&movie->st[i].codec_ctx);
        av_frame_free(&movie->st[i].frame);
    }
    av_packet_free(&movie->pkt);
    av_freep(&movie->st);
    av_freep(&movie->out_index);
    if (movie->format_ctx)
        avformat_close_input(&movie->format_ctx);
}

static int movie_query_formats(AVFilterContext *ctx)
{
    MovieContext *movie = ctx->priv;
    int list[] = { 0, -1 };
    AVChannelLayout list64[] = { { 0 }, { 0 } };
    int i, ret;

    for (i = 0; i < ctx->nb_outputs; i++) {
        MovieStream *st = &movie->st[i];
        AVCodecParameters *c = st->st->codecpar;
        AVFilterLink *outlink = ctx->outputs[i];

        switch (c->codec_type) {
        case AVMEDIA_TYPE_VIDEO:
            list[0] = c->format;
            if ((ret = ff_formats_ref(ff_make_format_list(list), &outlink->incfg.formats)) < 0)
                return ret;
            break;
        case AVMEDIA_TYPE_AUDIO:
            list[0] = c->format;
            if ((ret = ff_formats_ref(ff_make_format_list(list), &outlink->incfg.formats)) < 0)
                return ret;
            list[0] = c->sample_rate;
            if ((ret = ff_formats_ref(ff_make_format_list(list), &outlink->incfg.samplerates)) < 0)
                return ret;
            list64[0] = c->ch_layout;
            if ((ret = ff_channel_layouts_ref(ff_make_channel_layout_list(list64),
                                   &outlink->incfg.channel_layouts)) < 0)
                return ret;
            break;
        }
    }

    return 0;
}

static int movie_config_output_props(AVFilterLink *outlink)
{
    FilterLink *l = ff_filter_link(outlink);
    AVFilterContext *ctx = outlink->src;
    MovieContext *movie  = ctx->priv;
    unsigned out_id = FF_OUTLINK_IDX(outlink);
    MovieStream *st = &movie->st[out_id];
    AVCodecParameters *c = st->st->codecpar;

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

    switch (c->codec_type) {
    case AVMEDIA_TYPE_VIDEO:
        outlink->w          = c->width;
        outlink->h          = c->height;
        l->frame_rate = st->st->r_frame_rate;
        break;
    case AVMEDIA_TYPE_AUDIO:
        break;
    }

    st->link = outlink;

    return 0;
}

static int rewind_file(AVFilterContext *ctx)
{
    MovieContext *movie = ctx->priv;
    int64_t timestamp = movie->seek_point;
    int ret, i;

    if (movie->format_ctx->start_time != AV_NOPTS_VALUE)
        timestamp += movie->format_ctx->start_time;
    ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD);
    if (ret < 0) {
        av_log(ctx, AV_LOG_ERROR, "Unable to loop: %s\n", av_err2str(ret));
        movie->loop_count = 1; /* do not try again */
        return ret;
    }

    for (i = 0; i < ctx->nb_outputs; i++) {
        avcodec_flush_buffers(movie->st[i].codec_ctx);
    }
    return 0;
}

static int flush_decoder(AVFilterContext *ctx, int i)
{
    MovieContext *movie = ctx->priv;
    AVCodecContext *dec = movie->st[i].codec_ctx;

    return avcodec_send_packet(dec, NULL);
}

static int decode_packet(AVFilterContext *ctx, int i)
{
    AVFilterLink *outlink = ctx->outputs[i];
    MovieContext *movie = ctx->priv;
    MovieStream *st = &movie->st[i];
    AVCodecContext *dec = movie->st[i].codec_ctx;
    AVFrame *frame = movie->st[i].frame;
    AVPacket *pkt = movie->pkt;
    int ret = 0;

    // submit the packet to the decoder
    if (!movie->eof) {
        ret = avcodec_send_packet(dec, pkt);
        if (ret < 0)
            return ret;
    }

    // get all the available frames from the decoder
    if (ret >= 0) {
        ret = avcodec_receive_frame(dec, frame);
        if (ret < 0) {
            // those two return values are special and mean there is no output
            // frame available, but there were no errors during decoding
            if (ret == AVERROR_EOF || ret == AVERROR(EAGAIN))
                return 0;
            return ret;
        }

        frame->pts = frame->best_effort_timestamp;
        if (frame->pts != AV_NOPTS_VALUE) {
            if (movie->ts_offset)
                frame->pts += av_rescale_q_rnd(movie->ts_offset, AV_TIME_BASE_Q, outlink->time_base, AV_ROUND_UP);
            if (st->discontinuity_threshold) {
                if (st->last_pts != AV_NOPTS_VALUE) {
                    int64_t diff = frame->pts - st->last_pts;
                    if (diff < 0 || diff > st->discontinuity_threshold) {
                        av_log(ctx, AV_LOG_VERBOSE, "Discontinuity in stream:%d diff:%"PRId64"\n", i, diff);
                        movie->ts_offset += av_rescale_q_rnd(-diff, outlink->time_base, AV_TIME_BASE_Q, AV_ROUND_UP);
                        frame->pts -= diff;
                    }
                }
            }
            st->last_pts = frame->pts;
        }
        ret = ff_filter_frame(outlink, av_frame_clone(frame));
        if (ret < 0)
            return ret;
        if (ret == 0)
            return 1;
    }

    return 0;
}

static int activate(AVFilterContext *ctx)
{
    MovieContext *movie = ctx->priv;
    int wanted = 0, ret;

    for (int i = 0; i < ctx->nb_outputs; i++) {
        if (ff_outlink_frame_wanted(ctx->outputs[i]))
            wanted++;
    }

    if (wanted == 0)
        return FFERROR_NOT_READY;

    if (!movie->eof) {
        ret = av_read_frame(movie->format_ctx, movie->pkt);
        if (ret < 0) {
            movie->eof = 1;
            for (int i = 0; i < ctx->nb_outputs; i++)
                flush_decoder(ctx, i);
            ff_filter_set_ready(ctx, 100);
            return 0;
        } else {
            int pkt_out_id = movie->pkt->stream_index > movie->max_stream_index ? -1 :
                             movie->out_index[movie->pkt->stream_index];

            if (pkt_out_id >= 0) {
                ret = decode_packet(ctx, pkt_out_id);
            }
            av_packet_unref(movie->pkt);
            ff_filter_set_ready(ctx, 100);
            return (ret <= 0) ? ret : 0;
        }
    } else {
        int nb_eofs = 0;

        for (int i = 0; i < ctx->nb_outputs; i++) {
            if (!movie->st[i].eof) {
                ret = decode_packet(ctx, i);
                if (ret <= 0)
                    movie->st[i].eof = 1;
            }
            nb_eofs += movie->st[i].eof == 1;
        }
        if (nb_eofs == ctx->nb_outputs && movie->loop_count != 1) {
            ret = rewind_file(ctx);
            if (ret < 0)
                return ret;
            movie->loop_count -= movie->loop_count > 1;
            av_log(ctx, AV_LOG_VERBOSE, "Stream finished, looping.\n");
            ff_filter_set_ready(ctx, 100);
            for (int i = 0; i < ctx->nb_outputs; i++)
                movie->st[i].eof = 0;
            movie->eof = 0;
            return 0;
        } else {
            for (int i = 0; i < ctx->nb_outputs; i++) {
                if (movie->st[i].eof) {
                    ff_outlink_set_status(ctx->outputs[i], AVERROR_EOF, movie->st[i].last_pts);
                    nb_eofs++;
                }
            }
        }

        if (nb_eofs < ctx->nb_outputs)
            ff_filter_set_ready(ctx, 100);
        return 0;
    }

    return FFERROR_NOT_READY;
}

static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
                           char *res, int res_len, int flags)
{
    MovieContext *movie = ctx->priv;
    int ret = AVERROR(ENOSYS);

    if (!strcmp(cmd, "seek")) {
        int idx, flags, i;
        int64_t ts;
        char tail[2];

        if (sscanf(args, "%i|%"SCNi64"|%i %1s", &idx, &ts, &flags, tail) != 3)
            return AVERROR(EINVAL);

        ret = av_seek_frame(movie->format_ctx, idx, ts, flags);
        if (ret < 0)
            return ret;

        for (i = 0; i < ctx->nb_outputs; i++) {
            avcodec_flush_buffers(movie->st[i].codec_ctx);
        }
        return ret;
    } else if (!strcmp(cmd, "get_duration")) {
        int print_len;
        char tail[2];

        if (!res || res_len <= 0)
            return AVERROR(EINVAL);

        if (args && sscanf(args, "%1s", tail) == 1)
            return AVERROR(EINVAL);

        print_len = snprintf(res, res_len, "%"PRId64, movie->format_ctx->duration);
        if (print_len < 0 || print_len >= res_len)
            return AVERROR(EINVAL);

        return 0;
    }

    return ret;
}

AVFILTER_DEFINE_CLASS_EXT(movie, "(a)movie", movie_options);

#if CONFIG_MOVIE_FILTER

const AVFilter ff_avsrc_movie = {
    .name          = "movie",
    .description   = NULL_IF_CONFIG_SMALL("Read from a movie source."),
    .priv_size     = sizeof(MovieContext),
    .priv_class    = &movie_class,
    .init          = movie_common_init,
    .activate      = activate,
    .uninit        = movie_uninit,
    FILTER_QUERY_FUNC(movie_query_formats),

    .inputs    = NULL,
    .outputs   = NULL,
    .flags     = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
    .process_command = process_command
};

#endif  /* CONFIG_MOVIE_FILTER */

#if CONFIG_AMOVIE_FILTER

const AVFilter ff_avsrc_amovie = {
    .name          = "amovie",
    .description   = NULL_IF_CONFIG_SMALL("Read audio from a movie source."),
    .priv_class    = &movie_class,
    .priv_size     = sizeof(MovieContext),
    .init          = movie_common_init,
    .activate      = activate,
    .uninit        = movie_uninit,
    FILTER_QUERY_FUNC(movie_query_formats),

    .inputs     = NULL,
    .outputs    = NULL,
    .flags      = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
    .process_command = process_command,
};

#endif /* CONFIG_AMOVIE_FILTER */