GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mpegpicture.c Lines: 198 246 80.5 %
Date: 2020-07-11 02:49:52 Branches: 180 252 71.4 %

Line Branch Exec Source
1
/*
2
 * Mpeg video formats-related picture management functions
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
#include <stdint.h>
22
23
#include "libavutil/avassert.h"
24
#include "libavutil/common.h"
25
#include "libavutil/pixdesc.h"
26
#include "libavutil/imgutils.h"
27
28
#include "avcodec.h"
29
#include "motion_est.h"
30
#include "mpegpicture.h"
31
#include "mpegutils.h"
32
33
18557
static int make_tables_writable(Picture *pic)
34
{
35
    int ret, i;
36
#define MAKE_WRITABLE(table) \
37
do {\
38
    if (pic->table &&\
39
       (ret = av_buffer_make_writable(&pic->table)) < 0)\
40
    return ret;\
41
} while (0)
42
43

18557
    MAKE_WRITABLE(mb_var_buf);
44

18557
    MAKE_WRITABLE(mc_mb_var_buf);
45

18557
    MAKE_WRITABLE(mb_mean_buf);
46

18557
    MAKE_WRITABLE(mbskip_table_buf);
47

18557
    MAKE_WRITABLE(qscale_table_buf);
48

18557
    MAKE_WRITABLE(mb_type_buf);
49
50
55671
    for (i = 0; i < 2; i++) {
51

37114
        MAKE_WRITABLE(motion_val_buf[i]);
52

37114
        MAKE_WRITABLE(ref_index_buf[i]);
53
    }
54
55
18557
    return 0;
56
}
57
58
436
int ff_mpeg_framesize_alloc(AVCodecContext *avctx, MotionEstContext *me,
59
                            ScratchpadContext *sc, int linesize)
60
{
61
#   define EMU_EDGE_HEIGHT (4 * 70)
62
436
    int alloc_size = FFALIGN(FFABS(linesize) + 64, 32);
63
64
436
    if (avctx->hwaccel)
65
        return 0;
66
67
436
    if (linesize < 24) {
68
        av_log(avctx, AV_LOG_ERROR, "Image too small, temporary buffers cannot function\n");
69
        return AVERROR_PATCHWELCOME;
70
    }
71
72
436
    if (av_image_check_size2(alloc_size, EMU_EDGE_HEIGHT, avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx) < 0)
73
        return AVERROR(ENOMEM);
74
75
    // edge emu needs blocksize + filter length - 1
76
    // (= 17x17 for  halfpel / 21x21 for H.264)
77
    // VC-1 computes luma and chroma simultaneously and needs 19X19 + 9x9
78
    // at uvlinesize. It supports only YUV420 so 24x24 is enough
79
    // linesize * interlaced * MBsize
80
    // we also use this buffer for encoding in encode_mb_internal() needig an additional 32 lines
81
436
    if (!FF_ALLOCZ_TYPED_ARRAY(sc->edge_emu_buffer, alloc_size * EMU_EDGE_HEIGHT) ||
82
436
        !FF_ALLOCZ_TYPED_ARRAY(me->scratchpad,      alloc_size * 4 * 16 * 2))
83
        return AVERROR(ENOMEM);
84
436
    me->temp            = me->scratchpad;
85
436
    sc->rd_scratchpad   = me->scratchpad;
86
436
    sc->b_scratchpad    = me->scratchpad;
87
436
    sc->obmc_scratchpad = me->scratchpad + 16;
88
89
436
    return 0;
90
}
91
92
/**
93
 * Allocate a frame buffer
94
 */
95
19208
static int alloc_frame_buffer(AVCodecContext *avctx,  Picture *pic,
96
                              MotionEstContext *me, ScratchpadContext *sc,
97
                              int chroma_x_shift, int chroma_y_shift,
98
                              int linesize, int uvlinesize)
99
{
100
19208
    int edges_needed = av_codec_is_encoder(avctx->codec);
101
    int r, ret;
102
103
19208
    pic->tf.f = pic->f;
104
19208
    if (avctx->codec_id != AV_CODEC_ID_WMV3IMAGE &&
105
19208
        avctx->codec_id != AV_CODEC_ID_VC1IMAGE  &&
106
19208
        avctx->codec_id != AV_CODEC_ID_MSS2) {
107
19129
        if (edges_needed) {
108
8358
            pic->f->width  = avctx->width  + 2 * EDGE_WIDTH;
109
8358
            pic->f->height = avctx->height + 2 * EDGE_WIDTH;
110
        }
111
112
19129
        r = ff_thread_get_buffer(avctx, &pic->tf,
113
19129
                                 pic->reference ? AV_GET_BUFFER_FLAG_REF : 0);
114
    } else {
115
79
        pic->f->width  = avctx->width;
116
79
        pic->f->height = avctx->height;
117
79
        pic->f->format = avctx->pix_fmt;
118
79
        r = avcodec_default_get_buffer2(avctx, pic->f, 0);
119
    }
120
121

19208
    if (r < 0 || !pic->f->buf[0]) {
122
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed (%d %p)\n",
123
               r, pic->f->data[0]);
124
        return -1;
125
    }
126
127
19208
    if (edges_needed) {
128
        int i;
129
33432
        for (i = 0; pic->f->data[i]; i++) {
130
25074
            int offset = (EDGE_WIDTH >> (i ? chroma_y_shift : 0)) *
131
25074
                         pic->f->linesize[i] +
132
25074
                         (EDGE_WIDTH >> (i ? chroma_x_shift : 0));
133
25074
            pic->f->data[i] += offset;
134
        }
135
8358
        pic->f->width  = avctx->width;
136
8358
        pic->f->height = avctx->height;
137
    }
138
139
19208
    if (avctx->hwaccel) {
140
        assert(!pic->hwaccel_picture_private);
141
        if (avctx->hwaccel->frame_priv_data_size) {
142
            pic->hwaccel_priv_buf = av_buffer_allocz(avctx->hwaccel->frame_priv_data_size);
143
            if (!pic->hwaccel_priv_buf) {
144
                av_log(avctx, AV_LOG_ERROR, "alloc_frame_buffer() failed (hwaccel private data allocation)\n");
145
                return -1;
146
            }
147
            pic->hwaccel_picture_private = pic->hwaccel_priv_buf->data;
148
        }
149
    }
150
151

19208
    if ((linesize   &&   linesize != pic->f->linesize[0]) ||
152
18808
        (uvlinesize && uvlinesize != pic->f->linesize[1])) {
153
        av_log(avctx, AV_LOG_ERROR,
154
               "get_buffer() failed (stride changed: linesize=%d/%d uvlinesize=%d/%d)\n",
155
               linesize,   pic->f->linesize[0],
156
               uvlinesize, pic->f->linesize[1]);
157
        ff_mpeg_unref_picture(avctx, pic);
158
        return -1;
159
    }
160
161
19208
    if (av_pix_fmt_count_planes(pic->f->format) > 2 &&
162
19208
        pic->f->linesize[1] != pic->f->linesize[2]) {
163
        av_log(avctx, AV_LOG_ERROR,
164
               "get_buffer() failed (uv stride mismatch)\n");
165
        ff_mpeg_unref_picture(avctx, pic);
166
        return -1;
167
    }
168
169

19608
    if (!sc->edge_emu_buffer &&
170
400
        (ret = ff_mpeg_framesize_alloc(avctx, me, sc,
171
400
                                       pic->f->linesize[0])) < 0) {
172
        av_log(avctx, AV_LOG_ERROR,
173
               "get_buffer() failed to allocate context scratch buffers.\n");
174
        ff_mpeg_unref_picture(avctx, pic);
175
        return ret;
176
    }
177
178
19208
    return 0;
179
}
180
181
1300
static int alloc_picture_tables(AVCodecContext *avctx, Picture *pic, int encoding, int out_format,
182
                                int mb_stride, int mb_width, int mb_height, int b8_stride)
183
{
184
1300
    const int big_mb_num    = mb_stride * (mb_height + 1) + 1;
185
1300
    const int mb_array_size = mb_stride * mb_height;
186
1300
    const int b8_array_size = b8_stride * mb_height * 2;
187
    int i;
188
189
190
1300
    pic->mbskip_table_buf = av_buffer_allocz(mb_array_size + 2);
191
1300
    pic->qscale_table_buf = av_buffer_allocz(big_mb_num + mb_stride);
192
1300
    pic->mb_type_buf      = av_buffer_allocz((big_mb_num + mb_stride) *
193
                                             sizeof(uint32_t));
194

1300
    if (!pic->mbskip_table_buf || !pic->qscale_table_buf || !pic->mb_type_buf)
195
        return AVERROR(ENOMEM);
196
197
1300
    if (encoding) {
198
687
        pic->mb_var_buf    = av_buffer_allocz(mb_array_size * sizeof(int16_t));
199
687
        pic->mc_mb_var_buf = av_buffer_allocz(mb_array_size * sizeof(int16_t));
200
687
        pic->mb_mean_buf   = av_buffer_allocz(mb_array_size);
201

687
        if (!pic->mb_var_buf || !pic->mc_mb_var_buf || !pic->mb_mean_buf)
202
            return AVERROR(ENOMEM);
203
    }
204
205

1300
    if (out_format == FMT_H263 || encoding ||
206
#if FF_API_DEBUG_MV
207
        avctx->debug_mv ||
208
#endif
209
184
        (avctx->export_side_data & AV_CODEC_EXPORT_DATA_MVS)) {
210
1116
        int mv_size        = 2 * (b8_array_size + 4) * sizeof(int16_t);
211
1116
        int ref_index_size = 4 * mb_array_size;
212
213

3348
        for (i = 0; mv_size && i < 2; i++) {
214
2232
            pic->motion_val_buf[i] = av_buffer_allocz(mv_size);
215
2232
            pic->ref_index_buf[i]  = av_buffer_allocz(ref_index_size);
216

2232
            if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i])
217
                return AVERROR(ENOMEM);
218
        }
219
    }
220
221
1300
    pic->alloc_mb_width  = mb_width;
222
1300
    pic->alloc_mb_height = mb_height;
223
224
1300
    return 0;
225
}
226
227
/**
228
 * Allocate a Picture.
229
 * The pixels are allocated/set by calling get_buffer() if shared = 0
230
 */
231
19857
int ff_alloc_picture(AVCodecContext *avctx, Picture *pic, MotionEstContext *me,
232
                     ScratchpadContext *sc, int shared, int encoding,
233
                     int chroma_x_shift, int chroma_y_shift, int out_format,
234
                     int mb_stride, int mb_width, int mb_height, int b8_stride,
235
                     ptrdiff_t *linesize, ptrdiff_t *uvlinesize)
236
{
237
    int i, ret;
238
239
19857
    if (pic->qscale_table_buf)
240
18557
        if (   pic->alloc_mb_width  != mb_width
241
18557
            || pic->alloc_mb_height != mb_height)
242
            ff_free_picture_tables(pic);
243
244
19857
    if (shared) {
245
649
        av_assert0(pic->f->data[0]);
246
649
        pic->shared = 1;
247
    } else {
248
19208
        av_assert0(!pic->f->buf[0]);
249
19208
        if (alloc_frame_buffer(avctx, pic, me, sc,
250
                               chroma_x_shift, chroma_y_shift,
251
19208
                               *linesize, *uvlinesize) < 0)
252
            return -1;
253
254
19208
        *linesize   = pic->f->linesize[0];
255
19208
        *uvlinesize = pic->f->linesize[1];
256
    }
257
258
19857
    if (!pic->qscale_table_buf)
259
1300
        ret = alloc_picture_tables(avctx, pic, encoding, out_format,
260
                                   mb_stride, mb_width, mb_height, b8_stride);
261
    else
262
18557
        ret = make_tables_writable(pic);
263
19857
    if (ret < 0)
264
        goto fail;
265
266
19857
    if (encoding) {
267
9007
        pic->mb_var    = (uint16_t*)pic->mb_var_buf->data;
268
9007
        pic->mc_mb_var = (uint16_t*)pic->mc_mb_var_buf->data;
269
9007
        pic->mb_mean   = pic->mb_mean_buf->data;
270
    }
271
272
19857
    pic->mbskip_table = pic->mbskip_table_buf->data;
273
19857
    pic->qscale_table = pic->qscale_table_buf->data + 2 * mb_stride + 1;
274
19857
    pic->mb_type      = (uint32_t*)pic->mb_type_buf->data + 2 * mb_stride + 1;
275
276
19857
    if (pic->motion_val_buf[0]) {
277
48192
        for (i = 0; i < 2; i++) {
278
32128
            pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;
279
32128
            pic->ref_index[i]  = pic->ref_index_buf[i]->data;
280
        }
281
    }
282
283
19857
    return 0;
284
fail:
285
    av_log(avctx, AV_LOG_ERROR, "Error allocating a picture.\n");
286
    ff_mpeg_unref_picture(avctx, pic);
287
    ff_free_picture_tables(pic);
288
    return AVERROR(ENOMEM);
289
}
290
291
/**
292
 * Deallocate a picture.
293
 */
294
784677
void ff_mpeg_unref_picture(AVCodecContext *avctx, Picture *pic)
295
{
296
784677
    int off = offsetof(Picture, mb_mean) + sizeof(pic->mb_mean);
297
298
784677
    pic->tf.f = pic->f;
299
    /* WM Image / Screen codecs allocate internal buffers with different
300
     * dimensions / colorspaces; ignore user-defined callbacks for these. */
301
784677
    if (avctx->codec_id != AV_CODEC_ID_WMV3IMAGE &&
302
784677
        avctx->codec_id != AV_CODEC_ID_VC1IMAGE  &&
303
784677
        avctx->codec_id != AV_CODEC_ID_MSS2)
304
778115
        ff_thread_release_buffer(avctx, &pic->tf);
305
6562
    else if (pic->f)
306
6562
        av_frame_unref(pic->f);
307
308
784677
    av_buffer_unref(&pic->hwaccel_priv_buf);
309
310
784677
    if (pic->needs_realloc)
311
1348
        ff_free_picture_tables(pic);
312
313
784677
    memset((uint8_t*)pic + off, 0, sizeof(*pic) - off);
314
784677
}
315
316
73725
int ff_update_picture_tables(Picture *dst, Picture *src)
317
{
318
     int i;
319
320
#define UPDATE_TABLE(table)                                                   \
321
do {                                                                          \
322
    if (src->table &&                                                         \
323
        (!dst->table || dst->table->buffer != src->table->buffer)) {          \
324
        av_buffer_unref(&dst->table);                                         \
325
        dst->table = av_buffer_ref(src->table);                               \
326
        if (!dst->table) {                                                    \
327
            ff_free_picture_tables(dst);                                      \
328
            return AVERROR(ENOMEM);                                           \
329
        }                                                                     \
330
    }                                                                         \
331
} while (0)
332
333


73725
    UPDATE_TABLE(mb_var_buf);
334


73725
    UPDATE_TABLE(mc_mb_var_buf);
335


73725
    UPDATE_TABLE(mb_mean_buf);
336


73725
    UPDATE_TABLE(mbskip_table_buf);
337


73725
    UPDATE_TABLE(qscale_table_buf);
338


73725
    UPDATE_TABLE(mb_type_buf);
339
221175
    for (i = 0; i < 2; i++) {
340


147450
        UPDATE_TABLE(motion_val_buf[i]);
341


147450
        UPDATE_TABLE(ref_index_buf[i]);
342
    }
343
344
73725
    dst->mb_var        = src->mb_var;
345
73725
    dst->mc_mb_var     = src->mc_mb_var;
346
73725
    dst->mb_mean       = src->mb_mean;
347
73725
    dst->mbskip_table  = src->mbskip_table;
348
73725
    dst->qscale_table  = src->qscale_table;
349
73725
    dst->mb_type       = src->mb_type;
350
221175
    for (i = 0; i < 2; i++) {
351
147450
        dst->motion_val[i] = src->motion_val[i];
352
147450
        dst->ref_index[i]  = src->ref_index[i];
353
    }
354
355
73725
    dst->alloc_mb_width  = src->alloc_mb_width;
356
73725
    dst->alloc_mb_height = src->alloc_mb_height;
357
358
73725
    return 0;
359
}
360
361
73725
int ff_mpeg_ref_picture(AVCodecContext *avctx, Picture *dst, Picture *src)
362
{
363
    int ret;
364
365
73725
    av_assert0(!dst->f->buf[0]);
366
73725
    av_assert0(src->f->buf[0]);
367
368
73725
    src->tf.f = src->f;
369
73725
    dst->tf.f = dst->f;
370
73725
    ret = ff_thread_ref_frame(&dst->tf, &src->tf);
371
73725
    if (ret < 0)
372
        goto fail;
373
374
73725
    ret = ff_update_picture_tables(dst, src);
375
73725
    if (ret < 0)
376
        goto fail;
377
378
73725
    if (src->hwaccel_picture_private) {
379
        dst->hwaccel_priv_buf = av_buffer_ref(src->hwaccel_priv_buf);
380
        if (!dst->hwaccel_priv_buf) {
381
            ret = AVERROR(ENOMEM);
382
            goto fail;
383
        }
384
        dst->hwaccel_picture_private = dst->hwaccel_priv_buf->data;
385
    }
386
387
73725
    dst->field_picture           = src->field_picture;
388
73725
    dst->mb_var_sum              = src->mb_var_sum;
389
73725
    dst->mc_mb_var_sum           = src->mc_mb_var_sum;
390
73725
    dst->b_frame_score           = src->b_frame_score;
391
73725
    dst->needs_realloc           = src->needs_realloc;
392
73725
    dst->reference               = src->reference;
393
73725
    dst->shared                  = src->shared;
394
395
73725
    memcpy(dst->encoding_error, src->encoding_error,
396
           sizeof(dst->encoding_error));
397
398
73725
    return 0;
399
fail:
400
    ff_mpeg_unref_picture(avctx, dst);
401
    return ret;
402
}
403
404
41113
static inline int pic_is_unused(Picture *pic)
405
{
406
41113
    if (!pic->f->buf[0])
407
18840
        return 1;
408

22273
    if (pic->needs_realloc && !(pic->reference & DELAYED_PIC_REF))
409
20
        return 1;
410
22253
    return 0;
411
}
412
413
19509
static int find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
414
{
415
    int i;
416
417
19509
    if (shared) {
418
852
        for (i = 0; i < MAX_PICTURE_COUNT; i++) {
419
852
            if (!picture[i].f->buf[0])
420
649
                return i;
421
        }
422
    } else {
423
41113
        for (i = 0; i < MAX_PICTURE_COUNT; i++) {
424
41113
            if (pic_is_unused(&picture[i]))
425
18860
                return i;
426
        }
427
    }
428
429
    av_log(avctx, AV_LOG_FATAL,
430
           "Internal error, picture buffer overflow\n");
431
    /* We could return -1, but the codec would crash trying to draw into a
432
     * non-existing frame anyway. This is safer than waiting for a random crash.
433
     * Also the return of this is never useful, an encoder must only allocate
434
     * as much as allowed in the specification. This has no relationship to how
435
     * much libavcodec could allocate (and MAX_PICTURE_COUNT is always large
436
     * enough for such valid streams).
437
     * Plus, a decoder has to check stream validity and remove frames if too
438
     * many reference frames are around. Waiting for "OOM" is not correct at
439
     * all. Similarly, missing reference frames have to be replaced by
440
     * interpolated/MC frames, anything else is a bug in the codec ...
441
     */
442
    abort();
443
    return -1;
444
}
445
446
19509
int ff_find_unused_picture(AVCodecContext *avctx, Picture *picture, int shared)
447
{
448
19509
    int ret = find_unused_picture(avctx, picture, shared);
449
450

19509
    if (ret >= 0 && ret < MAX_PICTURE_COUNT) {
451
19509
        if (picture[ret].needs_realloc) {
452
20
            picture[ret].needs_realloc = 0;
453
20
            ff_free_picture_tables(&picture[ret]);
454
20
            ff_mpeg_unref_picture(avctx, &picture[ret]);
455
        }
456
    }
457
19509
    return ret;
458
}
459
460
31686
void ff_free_picture_tables(Picture *pic)
461
{
462
    int i;
463
464
31686
    pic->alloc_mb_width  =
465
31686
    pic->alloc_mb_height = 0;
466
467
31686
    av_buffer_unref(&pic->mb_var_buf);
468
31686
    av_buffer_unref(&pic->mc_mb_var_buf);
469
31686
    av_buffer_unref(&pic->mb_mean_buf);
470
31686
    av_buffer_unref(&pic->mbskip_table_buf);
471
31686
    av_buffer_unref(&pic->qscale_table_buf);
472
31686
    av_buffer_unref(&pic->mb_type_buf);
473
474
95058
    for (i = 0; i < 2; i++) {
475
63372
        av_buffer_unref(&pic->motion_val_buf[i]);
476
63372
        av_buffer_unref(&pic->ref_index_buf[i]);
477
    }
478
31686
}