GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/bsf.c Lines: 88 283 31.1 %
Date: 2019-11-22 03:34:36 Branches: 49 162 30.2 %

Line Branch Exec Source
1
/*
2
 * This file is part of FFmpeg.
3
 *
4
 * FFmpeg is free software; you can redistribute it and/or
5
 * modify it under the terms of the GNU Lesser General Public
6
 * License as published by the Free Software Foundation; either
7
 * version 2.1 of the License, or (at your option) any later version.
8
 *
9
 * FFmpeg is distributed in the hope that it will be useful,
10
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12
 * Lesser General Public License for more details.
13
 *
14
 * You should have received a copy of the GNU Lesser General Public
15
 * License along with FFmpeg; if not, write to the Free Software
16
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17
 */
18
19
#include <string.h>
20
21
#include "libavutil/log.h"
22
#include "libavutil/mem.h"
23
#include "libavutil/opt.h"
24
#include "libavutil/avstring.h"
25
#include "libavutil/bprint.h"
26
27
#include "avcodec.h"
28
#include "bsf.h"
29
30
struct AVBSFInternal {
31
    AVPacket *buffer_pkt;
32
    int eof;
33
};
34
35
31760
void av_bsf_free(AVBSFContext **pctx)
36
{
37
    AVBSFContext *ctx;
38
39

31760
    if (!pctx || !*pctx)
40
18613
        return;
41
13147
    ctx = *pctx;
42
43
13147
    if (ctx->filter->close)
44
1220
        ctx->filter->close(ctx);
45

13147
    if (ctx->filter->priv_class && ctx->priv_data)
46
744
        av_opt_free(ctx->priv_data);
47
48
13147
    av_opt_free(ctx);
49
50
13147
    if (ctx->internal)
51
13147
        av_packet_free(&ctx->internal->buffer_pkt);
52
13147
    av_freep(&ctx->internal);
53
13147
    av_freep(&ctx->priv_data);
54
55
13147
    avcodec_parameters_free(&ctx->par_in);
56
13147
    avcodec_parameters_free(&ctx->par_out);
57
58
13147
    av_freep(pctx);
59
}
60
61
static void *bsf_child_next(void *obj, void *prev)
62
{
63
    AVBSFContext *ctx = obj;
64
    if (!prev && ctx->filter->priv_class)
65
        return ctx->priv_data;
66
    return NULL;
67
}
68
69
static const AVClass bsf_class = {
70
    .class_name       = "AVBSFContext",
71
    .item_name        = av_default_item_name,
72
    .version          = LIBAVUTIL_VERSION_INT,
73
    .child_next       = bsf_child_next,
74
    .child_class_next = ff_bsf_child_class_next,
75
};
76
77
const AVClass *av_bsf_get_class(void)
78
{
79
    return &bsf_class;
80
}
81
82
13147
int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx)
83
{
84
    AVBSFContext *ctx;
85
    int ret;
86
87
13147
    ctx = av_mallocz(sizeof(*ctx));
88
13147
    if (!ctx)
89
        return AVERROR(ENOMEM);
90
91
13147
    ctx->av_class = &bsf_class;
92
13147
    ctx->filter   = filter;
93
94
13147
    ctx->par_in  = avcodec_parameters_alloc();
95
13147
    ctx->par_out = avcodec_parameters_alloc();
96

13147
    if (!ctx->par_in || !ctx->par_out) {
97
        ret = AVERROR(ENOMEM);
98
        goto fail;
99
    }
100
101
13147
    ctx->internal = av_mallocz(sizeof(*ctx->internal));
102
13147
    if (!ctx->internal) {
103
        ret = AVERROR(ENOMEM);
104
        goto fail;
105
    }
106
107
13147
    ctx->internal->buffer_pkt = av_packet_alloc();
108
13147
    if (!ctx->internal->buffer_pkt) {
109
        ret = AVERROR(ENOMEM);
110
        goto fail;
111
    }
112
113
13147
    av_opt_set_defaults(ctx);
114
115
    /* allocate priv data and init private options */
116
13147
    if (filter->priv_data_size) {
117
1235
        ctx->priv_data = av_mallocz(filter->priv_data_size);
118
1235
        if (!ctx->priv_data) {
119
            ret = AVERROR(ENOMEM);
120
            goto fail;
121
        }
122
1235
        if (filter->priv_class) {
123
744
            *(const AVClass **)ctx->priv_data = filter->priv_class;
124
744
            av_opt_set_defaults(ctx->priv_data);
125
        }
126
    }
127
128
13147
    *pctx = ctx;
129
13147
    return 0;
130
fail:
131
    av_bsf_free(&ctx);
132
    return ret;
133
}
134
135
13147
int av_bsf_init(AVBSFContext *ctx)
136
{
137
    int ret, i;
138
139
    /* check that the codec is supported */
140
13147
    if (ctx->filter->codec_ids) {
141
4149
        for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++)
142
4149
            if (ctx->par_in->codec_id == ctx->filter->codec_ids[i])
143
1234
                break;
144
1234
        if (ctx->filter->codec_ids[i] == AV_CODEC_ID_NONE) {
145
            const AVCodecDescriptor *desc = avcodec_descriptor_get(ctx->par_in->codec_id);
146
            av_log(ctx, AV_LOG_ERROR, "Codec '%s' (%d) is not supported by the "
147
                   "bitstream filter '%s'. Supported codecs are: ",
148
                   desc ? desc->name : "unknown", ctx->par_in->codec_id, ctx->filter->name);
149
            for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++) {
150
                desc = avcodec_descriptor_get(ctx->filter->codec_ids[i]);
151
                av_log(ctx, AV_LOG_ERROR, "%s (%d) ",
152
                       desc ? desc->name : "unknown", ctx->filter->codec_ids[i]);
153
            }
154
            av_log(ctx, AV_LOG_ERROR, "\n");
155
            return AVERROR(EINVAL);
156
        }
157
    }
158
159
    /* initialize output parameters to be the same as input
160
     * init below might overwrite that */
161
13147
    ret = avcodec_parameters_copy(ctx->par_out, ctx->par_in);
162
13147
    if (ret < 0)
163
        return ret;
164
165
13147
    ctx->time_base_out = ctx->time_base_in;
166
167
13147
    if (ctx->filter->init) {
168
1229
        ret = ctx->filter->init(ctx);
169
1229
        if (ret < 0)
170
            return ret;
171
    }
172
173
13147
    return 0;
174
}
175
176
28
void av_bsf_flush(AVBSFContext *ctx)
177
{
178
28
    ctx->internal->eof = 0;
179
180
28
    av_packet_unref(ctx->internal->buffer_pkt);
181
182
28
    if (ctx->filter->flush)
183
        ctx->filter->flush(ctx);
184
28
}
185
186
400059
int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
187
{
188
    int ret;
189
190

400059
    if (!pkt || (!pkt->data && !pkt->side_data_elems)) {
191
5740
        ctx->internal->eof = 1;
192
5740
        return 0;
193
    }
194
195
394319
    if (ctx->internal->eof) {
196
        av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n");
197
        return AVERROR(EINVAL);
198
    }
199
200
394319
    if (ctx->internal->buffer_pkt->data ||
201
394319
        ctx->internal->buffer_pkt->side_data_elems)
202
        return AVERROR(EAGAIN);
203
204
394319
    ret = av_packet_make_refcounted(pkt);
205
394319
    if (ret < 0)
206
        return ret;
207
394319
    av_packet_move_ref(ctx->internal->buffer_pkt, pkt);
208
209
394319
    return 0;
210
}
211
212
793489
int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
213
{
214
793489
    return ctx->filter->filter(ctx, pkt);
215
}
216
217
578
int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
218
{
219
578
    AVBSFInternal *in = ctx->internal;
220
    AVPacket *tmp_pkt;
221
222
578
    if (in->eof)
223
        return AVERROR_EOF;
224
225
578
    if (!ctx->internal->buffer_pkt->data &&
226
132
        !ctx->internal->buffer_pkt->side_data_elems)
227
132
        return AVERROR(EAGAIN);
228
229
446
    tmp_pkt = av_packet_alloc();
230
446
    if (!tmp_pkt)
231
        return AVERROR(ENOMEM);
232
233
446
    *pkt = ctx->internal->buffer_pkt;
234
446
    ctx->internal->buffer_pkt = tmp_pkt;
235
236
446
    return 0;
237
}
238
239
792849
int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
240
{
241
792849
    AVBSFInternal *in = ctx->internal;
242
243
792849
    if (in->eof)
244
5740
        return AVERROR_EOF;
245
246
787109
    if (!ctx->internal->buffer_pkt->data &&
247
393236
        !ctx->internal->buffer_pkt->side_data_elems)
248
393236
        return AVERROR(EAGAIN);
249
250
393873
    av_packet_move_ref(pkt, ctx->internal->buffer_pkt);
251
252
393873
    return 0;
253
}
254
255
typedef struct BSFListContext {
256
    const AVClass *class;
257
258
    AVBSFContext **bsfs;
259
    int nb_bsfs;
260
261
    unsigned idx;           // index of currently processed BSF
262
    unsigned flushed_idx;   // index of BSF being flushed
263
264
    char * item_name;
265
} BSFListContext;
266
267
268
static int bsf_list_init(AVBSFContext *bsf)
269
{
270
    BSFListContext *lst = bsf->priv_data;
271
    int ret, i;
272
    const AVCodecParameters *cod_par = bsf->par_in;
273
    AVRational tb = bsf->time_base_in;
274
275
    for (i = 0; i < lst->nb_bsfs; ++i) {
276
        ret = avcodec_parameters_copy(lst->bsfs[i]->par_in, cod_par);
277
        if (ret < 0)
278
            goto fail;
279
280
        lst->bsfs[i]->time_base_in = tb;
281
282
        ret = av_bsf_init(lst->bsfs[i]);
283
        if (ret < 0)
284
            goto fail;
285
286
        cod_par = lst->bsfs[i]->par_out;
287
        tb = lst->bsfs[i]->time_base_out;
288
    }
289
290
    bsf->time_base_out = tb;
291
    ret = avcodec_parameters_copy(bsf->par_out, cod_par);
292
293
fail:
294
    return ret;
295
}
296
297
static int bsf_list_filter(AVBSFContext *bsf, AVPacket *out)
298
{
299
    BSFListContext *lst = bsf->priv_data;
300
    int ret;
301
302
    if (!lst->nb_bsfs)
303
        return ff_bsf_get_packet_ref(bsf, out);
304
305
    while (1) {
306
        if (lst->idx > lst->flushed_idx) {
307
            ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out);
308
            if (ret == AVERROR(EAGAIN)) {
309
                /* no more packets from idx-1, try with previous */
310
                lst->idx--;
311
                continue;
312
            } else if (ret == AVERROR_EOF) {
313
                /* filter idx-1 is done, continue with idx...nb_bsfs */
314
                lst->flushed_idx = lst->idx;
315
                continue;
316
            }else if (ret < 0) {
317
                /* filtering error */
318
                break;
319
            }
320
        } else {
321
            ret = ff_bsf_get_packet_ref(bsf, out);
322
            if (ret == AVERROR_EOF) {
323
                lst->idx = lst->flushed_idx;
324
            } else if (ret < 0)
325
                break;
326
        }
327
328
        if (lst->idx < lst->nb_bsfs) {
329
            AVPacket *pkt;
330
            if (ret == AVERROR_EOF && lst->idx == lst->flushed_idx) {
331
                /* ff_bsf_get_packet_ref returned EOF and idx is first
332
                 * filter of yet not flushed filter chain */
333
                pkt = NULL;
334
            } else {
335
                pkt = out;
336
            }
337
            ret = av_bsf_send_packet(lst->bsfs[lst->idx], pkt);
338
            if (ret < 0)
339
                break;
340
            lst->idx++;
341
        } else {
342
            /* The end of filter chain, break to return result */
343
            break;
344
        }
345
    }
346
347
    if (ret < 0)
348
        av_packet_unref(out);
349
350
    return ret;
351
}
352
353
static void bsf_list_flush(AVBSFContext *bsf)
354
{
355
    BSFListContext *lst = bsf->priv_data;
356
357
    for (int i = 0; i < lst->nb_bsfs; i++)
358
        av_bsf_flush(lst->bsfs[i]);
359
    lst->idx = lst->flushed_idx = 0;
360
}
361
362
static void bsf_list_close(AVBSFContext *bsf)
363
{
364
    BSFListContext *lst = bsf->priv_data;
365
    int i;
366
367
    for (i = 0; i < lst->nb_bsfs; ++i)
368
        av_bsf_free(&lst->bsfs[i]);
369
    av_freep(&lst->bsfs);
370
    av_freep(&lst->item_name);
371
}
372
373
static const char *bsf_list_item_name(void *ctx)
374
{
375
    static const char *null_filter_name = "null";
376
    AVBSFContext *bsf_ctx = ctx;
377
    BSFListContext *lst = bsf_ctx->priv_data;
378
379
    if (!lst->nb_bsfs)
380
        return null_filter_name;
381
382
    if (!lst->item_name) {
383
        int i;
384
        AVBPrint bp;
385
        av_bprint_init(&bp, 16, 128);
386
387
        av_bprintf(&bp, "bsf_list(");
388
        for (i = 0; i < lst->nb_bsfs; i++)
389
            av_bprintf(&bp, i ? ",%s" : "%s", lst->bsfs[i]->filter->name);
390
        av_bprintf(&bp, ")");
391
392
        av_bprint_finalize(&bp, &lst->item_name);
393
    }
394
395
    return lst->item_name;
396
}
397
398
static const AVClass bsf_list_class = {
399
        .class_name = "bsf_list",
400
        .item_name  = bsf_list_item_name,
401
        .version    = LIBAVUTIL_VERSION_INT,
402
};
403
404
const AVBitStreamFilter ff_list_bsf = {
405
        .name           = "bsf_list",
406
        .priv_data_size = sizeof(BSFListContext),
407
        .priv_class     = &bsf_list_class,
408
        .init           = bsf_list_init,
409
        .filter         = bsf_list_filter,
410
        .flush          = bsf_list_flush,
411
        .close          = bsf_list_close,
412
};
413
414
struct AVBSFList {
415
    AVBSFContext **bsfs;
416
    int nb_bsfs;
417
};
418
419
AVBSFList *av_bsf_list_alloc(void)
420
{
421
    return av_mallocz(sizeof(AVBSFList));
422
}
423
424
void av_bsf_list_free(AVBSFList **lst)
425
{
426
    int i;
427
428
    if (!*lst)
429
        return;
430
431
    for (i = 0; i < (*lst)->nb_bsfs; ++i)
432
        av_bsf_free(&(*lst)->bsfs[i]);
433
    av_free((*lst)->bsfs);
434
    av_freep(lst);
435
}
436
437
int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf)
438
{
439
    return av_dynarray_add_nofree(&lst->bsfs, &lst->nb_bsfs, bsf);
440
}
441
442
int av_bsf_list_append2(AVBSFList *lst, const char *bsf_name, AVDictionary ** options)
443
{
444
    int ret;
445
    const AVBitStreamFilter *filter;
446
    AVBSFContext *bsf;
447
448
    filter = av_bsf_get_by_name(bsf_name);
449
    if (!filter)
450
        return AVERROR_BSF_NOT_FOUND;
451
452
    ret = av_bsf_alloc(filter, &bsf);
453
    if (ret < 0)
454
        return ret;
455
456
    if (options) {
457
        ret = av_opt_set_dict2(bsf, options, AV_OPT_SEARCH_CHILDREN);
458
        if (ret < 0)
459
            goto end;
460
    }
461
462
    ret = av_bsf_list_append(lst, bsf);
463
464
end:
465
    if (ret < 0)
466
        av_bsf_free(&bsf);
467
468
    return ret;
469
}
470
471
int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf)
472
{
473
    int ret = 0;
474
    BSFListContext *ctx;
475
476
    if ((*lst)->nb_bsfs == 1) {
477
        *bsf = (*lst)->bsfs[0];
478
        av_freep(&(*lst)->bsfs);
479
        (*lst)->nb_bsfs = 0;
480
        goto end;
481
    }
482
483
    ret = av_bsf_alloc(&ff_list_bsf, bsf);
484
    if (ret < 0)
485
        return ret;
486
487
    ctx = (*bsf)->priv_data;
488
489
    ctx->bsfs = (*lst)->bsfs;
490
    ctx->nb_bsfs = (*lst)->nb_bsfs;
491
492
end:
493
    av_freep(lst);
494
    return ret;
495
}
496
497
static int bsf_parse_single(const char *str, AVBSFList *bsf_lst)
498
{
499
    char *bsf_name, *bsf_options_str, *buf;
500
    AVDictionary *bsf_options = NULL;
501
    int ret = 0;
502
503
    if (!(buf = av_strdup(str)))
504
        return AVERROR(ENOMEM);
505
506
    bsf_name = av_strtok(buf, "=", &bsf_options_str);
507
    if (!bsf_name) {
508
        ret = AVERROR(EINVAL);
509
        goto end;
510
    }
511
512
    if (bsf_options_str) {
513
        ret = av_dict_parse_string(&bsf_options, bsf_options_str, "=", ":", 0);
514
        if (ret < 0)
515
            goto end;
516
    }
517
518
    ret = av_bsf_list_append2(bsf_lst, bsf_name, &bsf_options);
519
520
    av_dict_free(&bsf_options);
521
end:
522
    av_free(buf);
523
    return ret;
524
}
525
526
int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf_lst)
527
{
528
    AVBSFList *lst;
529
    char *bsf_str, *buf, *dup, *saveptr;
530
    int ret;
531
532
    if (!str)
533
        return av_bsf_get_null_filter(bsf_lst);
534
535
    lst = av_bsf_list_alloc();
536
    if (!lst)
537
        return AVERROR(ENOMEM);
538
539
    if (!(dup = buf = av_strdup(str))) {
540
        ret = AVERROR(ENOMEM);
541
        goto end;
542
    }
543
544
    while (1) {
545
        bsf_str = av_strtok(buf, ",", &saveptr);
546
        if (!bsf_str)
547
            break;
548
549
        ret = bsf_parse_single(bsf_str, lst);
550
        if (ret < 0)
551
            goto end;
552
553
        buf = NULL;
554
    }
555
556
    ret = av_bsf_list_finalize(&lst, bsf_lst);
557
end:
558
    if (ret < 0)
559
        av_bsf_list_free(&lst);
560
    av_free(dup);
561
    return ret;
562
}
563
564
int av_bsf_get_null_filter(AVBSFContext **bsf)
565
{
566
    return av_bsf_alloc(&ff_list_bsf, bsf);
567
}