GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/parser.c Lines: 142 180 78.9 %
Date: 2019-11-18 18:00:01 Branches: 90 118 76.3 %

Line Branch Exec Source
1
/*
2
 * Audio and Video frame extraction
3
 * Copyright (c) 2003 Fabrice Bellard
4
 * Copyright (c) 2003 Michael Niedermayer
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22
23
#include <inttypes.h>
24
#include <stdint.h>
25
#include <string.h>
26
27
#include "libavutil/avassert.h"
28
#include "libavutil/internal.h"
29
#include "libavutil/mem.h"
30
31
#include "internal.h"
32
#include "parser.h"
33
34
8572
AVCodecParserContext *av_parser_init(int codec_id)
35
{
36
8572
    AVCodecParserContext *s = NULL;
37
    const AVCodecParser *parser;
38
8572
    void *i = 0;
39
    int ret;
40
41
8572
    if (codec_id == AV_CODEC_ID_NONE)
42
50
        return NULL;
43
44
301002
    while ((parser = av_parser_iterate(&i))) {
45
297976
        if (parser->codec_ids[0] == codec_id ||
46
295687
            parser->codec_ids[1] == codec_id ||
47
292635
            parser->codec_ids[2] == codec_id ||
48
292496
            parser->codec_ids[3] == codec_id ||
49
292488
            parser->codec_ids[4] == codec_id)
50
5496
            goto found;
51
    }
52
3026
    return NULL;
53
54
5496
found:
55
5496
    s = av_mallocz(sizeof(AVCodecParserContext));
56
5496
    if (!s)
57
        goto err_out;
58
5496
    s->parser = (AVCodecParser*)parser;
59
5496
    s->priv_data = av_mallocz(parser->priv_data_size);
60
5496
    if (!s->priv_data)
61
        goto err_out;
62
5496
    s->fetch_timestamp=1;
63
5496
    s->pict_type = AV_PICTURE_TYPE_I;
64
5496
    if (parser->parser_init) {
65
1721
        ret = parser->parser_init(s);
66
1721
        if (ret != 0)
67
            goto err_out;
68
    }
69
5496
    s->key_frame            = -1;
70
#if FF_API_CONVERGENCE_DURATION
71
FF_DISABLE_DEPRECATION_WARNINGS
72
5496
    s->convergence_duration = 0;
73
FF_ENABLE_DEPRECATION_WARNINGS
74
#endif
75
5496
    s->dts_sync_point       = INT_MIN;
76
5496
    s->dts_ref_dts_delta    = INT_MIN;
77
5496
    s->pts_dts_delta        = INT_MIN;
78
5496
    s->format               = -1;
79
80
5496
    return s;
81
82
err_out:
83
    if (s)
84
        av_freep(&s->priv_data);
85
    av_free(s);
86
    return NULL;
87
}
88
89
146230
void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove, int fuzzy)
90
{
91
    int i;
92
93
146230
    if (!fuzzy) {
94
145457
        s->dts    =
95
145457
        s->pts    = AV_NOPTS_VALUE;
96
145457
        s->pos    = -1;
97
145457
        s->offset = 0;
98
    }
99
454741
    for (i = 0; i < AV_PARSER_PTS_NB; i++) {
100
418590
        if (s->cur_offset + off >= s->cur_frame_offset[i] &&
101
411001
            (s->frame_offset < s->cur_frame_offset[i] ||
102

256988
             (!s->frame_offset && !s->next_frame_offset)) && // first field/frame
103
            // check disabled since MPEG-TS does not send complete PES packets
104
155689
            /*s->next_frame_offset + off <*/  s->cur_frame_end[i]){
105
106

154840
            if (!fuzzy || s->cur_frame_dts[i] != AV_NOPTS_VALUE) {
107
154023
                s->dts    = s->cur_frame_dts[i];
108
154023
                s->pts    = s->cur_frame_pts[i];
109
154023
                s->pos    = s->cur_frame_pos[i];
110
154023
                s->offset = s->next_frame_offset - s->cur_frame_offset[i];
111
            }
112
154840
            if (remove)
113
10559
                s->cur_frame_offset[i] = INT64_MAX;
114
154840
            if (s->cur_offset + off < s->cur_frame_end[i])
115
110079
                break;
116
        }
117
    }
118
146230
}
119
120
661636
int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx,
121
                     uint8_t **poutbuf, int *poutbuf_size,
122
                     const uint8_t *buf, int buf_size,
123
                     int64_t pts, int64_t dts, int64_t pos)
124
{
125
    int index, i;
126
    uint8_t dummy_buf[AV_INPUT_BUFFER_PADDING_SIZE];
127
128
    av_assert1(avctx->codec_id != AV_CODEC_ID_NONE);
129
130
    /* Parsers only work for the specified codec ids. */
131
    av_assert1(avctx->codec_id == s->parser->codec_ids[0] ||
132
               avctx->codec_id == s->parser->codec_ids[1] ||
133
               avctx->codec_id == s->parser->codec_ids[2] ||
134
               avctx->codec_id == s->parser->codec_ids[3] ||
135
               avctx->codec_id == s->parser->codec_ids[4]);
136
137
661636
    if (!(s->flags & PARSER_FLAG_FETCHED_OFFSET)) {
138
2841
        s->next_frame_offset =
139
2841
        s->cur_offset        = pos;
140
2841
        s->flags            |= PARSER_FLAG_FETCHED_OFFSET;
141
    }
142
143
661636
    if (buf_size == 0) {
144
        /* padding is always necessary even if EOF, so we add it here */
145
2504
        memset(dummy_buf, 0, sizeof(dummy_buf));
146
2504
        buf = dummy_buf;
147
659132
    } else if (s->cur_offset + buf_size != s->cur_frame_end[s->cur_frame_start_index]) { /* skip remainder packets */
148
        /* add a new packet descriptor */
149
577473
        i = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
150
577473
        s->cur_frame_start_index = i;
151
577473
        s->cur_frame_offset[i]   = s->cur_offset;
152
577473
        s->cur_frame_end[i]      = s->cur_offset + buf_size;
153
577473
        s->cur_frame_pts[i]      = pts;
154
577473
        s->cur_frame_dts[i]      = dts;
155
577473
        s->cur_frame_pos[i]      = pos;
156
    }
157
158
661636
    if (s->fetch_timestamp) {
159
140248
        s->fetch_timestamp = 0;
160
140248
        s->last_pts        = s->pts;
161
140248
        s->last_dts        = s->dts;
162
140248
        s->last_pos        = s->pos;
163
140248
        ff_fetch_timestamp(s, 0, 0, 0);
164
    }
165
    /* WARNING: the returned index can be negative */
166
661636
    index = s->parser->parser_parse(s, avctx, (const uint8_t **) poutbuf,
167
                                    poutbuf_size, buf, buf_size);
168
661636
    av_assert0(index > -0x20000000); // The API does not allow returning AVERROR codes
169
#define FILL(name) if(s->name > 0 && avctx->name <= 0) avctx->name = s->name
170
661636
    if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
171

525259
        FILL(field_order);
172
    }
173
174
    /* update the file pointer */
175
661636
    if (*poutbuf_size) {
176
        /* fill the data for the current frame */
177
138243
        s->frame_offset = s->next_frame_offset;
178
179
        /* offset of the next frame */
180
138243
        s->next_frame_offset = s->cur_offset + index;
181
138243
        s->fetch_timestamp   = 1;
182
    }
183
661636
    if (index < 0)
184
4048
        index = 0;
185
661636
    s->cur_offset += index;
186
661636
    return index;
187
}
188
189
int av_parser_change(AVCodecParserContext *s, AVCodecContext *avctx,
190
                     uint8_t **poutbuf, int *poutbuf_size,
191
                     const uint8_t *buf, int buf_size, int keyframe)
192
{
193
    if (s && s->parser->split) {
194
        if (avctx->flags  & AV_CODEC_FLAG_GLOBAL_HEADER ||
195
            avctx->flags2 & AV_CODEC_FLAG2_LOCAL_HEADER) {
196
            int i = s->parser->split(avctx, buf, buf_size);
197
            buf      += i;
198
            buf_size -= i;
199
        }
200
    }
201
202
    /* cast to avoid warning about discarding qualifiers */
203
    *poutbuf      = (uint8_t *) buf;
204
    *poutbuf_size = buf_size;
205
    if (avctx->extradata) {
206
        if (keyframe && (avctx->flags2 & AV_CODEC_FLAG2_LOCAL_HEADER)) {
207
            int size = buf_size + avctx->extradata_size;
208
209
            *poutbuf_size = size;
210
            *poutbuf      = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
211
            if (!*poutbuf)
212
                return AVERROR(ENOMEM);
213
214
            memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
215
            memcpy(*poutbuf + avctx->extradata_size, buf,
216
                   buf_size + AV_INPUT_BUFFER_PADDING_SIZE);
217
            return 1;
218
        }
219
    }
220
221
    return 0;
222
}
223
224
5496
void av_parser_close(AVCodecParserContext *s)
225
{
226
5496
    if (s) {
227
5496
        if (s->parser->parser_close)
228
5198
            s->parser->parser_close(s);
229
5496
        av_freep(&s->priv_data);
230
5496
        av_free(s);
231
    }
232
5496
}
233
234
617653
int ff_combine_frame(ParseContext *pc, int next,
235
                     const uint8_t **buf, int *buf_size)
236
{
237
617653
    if (pc->overread) {
238
        ff_dlog(NULL, "overread %d, state:%"PRIX32" next:%d index:%d o_index:%d\n",
239
                pc->overread, pc->state, next, pc->index, pc->overread_index);
240
        ff_dlog(NULL, "%X %X %X %X\n",
241
                (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
242
    }
243
244
    /* Copy overread bytes from last frame into buffer. */
245
618117
    for (; pc->overread > 0; pc->overread--)
246
464
        pc->buffer[pc->index++] = pc->buffer[pc->overread_index++];
247
248
617653
    if (next > *buf_size)
249
        return AVERROR(EINVAL);
250
251
    /* flush remaining if EOF */
252

617653
    if (!*buf_size && next == END_NOT_FOUND)
253
1294
        next = 0;
254
255
617653
    pc->last_index = pc->index;
256
257
    /* copy into buffer end return */
258
617653
    if (next == END_NOT_FOUND) {
259
518396
        void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
260
518396
                                           *buf_size + pc->index +
261
                                           AV_INPUT_BUFFER_PADDING_SIZE);
262
263
518396
        if (!new_buffer) {
264
            av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", *buf_size + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
265
            pc->index = 0;
266
            return AVERROR(ENOMEM);
267
        }
268
518396
        pc->buffer = new_buffer;
269
518396
        memcpy(&pc->buffer[pc->index], *buf, *buf_size);
270
518396
        pc->index += *buf_size;
271
518396
        return -1;
272
    }
273
274

99257
    av_assert0(next >= 0 || pc->buffer);
275
276
99257
    *buf_size          =
277
99257
    pc->overread_index = pc->index + next;
278
279
    /* append to buffer */
280
99257
    if (pc->index) {
281
46185
        void *new_buffer = av_fast_realloc(pc->buffer, &pc->buffer_size,
282
46185
                                           next + pc->index +
283
                                           AV_INPUT_BUFFER_PADDING_SIZE);
284
46185
        if (!new_buffer) {
285
            av_log(NULL, AV_LOG_ERROR, "Failed to reallocate parser buffer to %d\n", next + pc->index + AV_INPUT_BUFFER_PADDING_SIZE);
286
            pc->overread_index =
287
            pc->index = 0;
288
            return AVERROR(ENOMEM);
289
        }
290
46185
        pc->buffer = new_buffer;
291
46185
        if (next > -AV_INPUT_BUFFER_PADDING_SIZE)
292
46181
            memcpy(&pc->buffer[pc->index], *buf,
293
46181
                   next + AV_INPUT_BUFFER_PADDING_SIZE);
294
46185
        pc->index = 0;
295
46185
        *buf      = pc->buffer;
296
    }
297
298
99257
    if (next < -8) {
299
37
        pc->overread += -8 - next;
300
37
        next = -8;
301
    }
302
    /* store overread bytes */
303
100017
    for (; next < 0; next++) {
304
760
        pc->state   = pc->state   << 8 | pc->buffer[pc->last_index + next];
305
760
        pc->state64 = pc->state64 << 8 | pc->buffer[pc->last_index + next];
306
760
        pc->overread++;
307
    }
308
309
99257
    if (pc->overread) {
310
        ff_dlog(NULL, "overread %d, state:%"PRIX32" next:%d index:%d o_index:%d\n",
311
                pc->overread, pc->state, next, pc->index, pc->overread_index);
312
        ff_dlog(NULL, "%X %X %X %X\n",
313
                (*buf)[0], (*buf)[1], (*buf)[2], (*buf)[3]);
314
    }
315
316
99257
    return 0;
317
}
318
319
4446
void ff_parse_close(AVCodecParserContext *s)
320
{
321
4446
    ParseContext *pc = s->priv_data;
322
323
4446
    av_freep(&pc->buffer);
324
4446
}
325
326
50
int ff_mpeg4video_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
327
{
328
50
    uint32_t state = -1;
329
50
    const uint8_t *ptr = buf, *end = buf + buf_size;
330
331
74
    while (ptr < end) {
332
74
        ptr = avpriv_find_start_code(ptr, end, &state);
333

74
        if (state == 0x1B3 || state == 0x1B6)
334
50
            return ptr - 4 - buf;
335
    }
336
337
    return 0;
338
}