FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/aac_ac3_parser.c
Date: 2026-08-27 23:16:01
Exec Total Coverage
Lines: 77 82 93.9%
Functions: 1 1 100.0%
Branches: 48 56 85.7%
Line Branch Exec Source
1 /*
2 * Common AAC and AC-3 parser
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 "config_components.h"
24
25 #include "libavutil/channel_layout.h"
26 #include "libavutil/common.h"
27 #include "parser.h"
28 #include "aac_ac3_parser.h"
29 #include "ac3_parser_internal.h"
30 #include "adts_header.h"
31
32 19864 int ff_aac_ac3_parse(AVCodecParserContext *s1,
33 AVCodecContext *avctx,
34 const uint8_t **poutbuf, int *poutbuf_size,
35 const uint8_t *buf, int buf_size)
36 {
37 19864 AACAC3ParseContext *s = s1->priv_data;
38 19864 ParseContext *pc = &s->pc;
39 int len, i;
40 int new_frame_start;
41 19864 int got_frame = 0;
42
43 19864 s1->key_frame = -1;
44
45
2/2
✓ Branch 0 taken 19708 times.
✓ Branch 1 taken 156 times.
 19864 if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES) {
46 156 i = buf_size;
47 156 got_frame = 1;
48 } else {
49 19708 get_next:
50 23666 i=END_NOT_FOUND;
51
2/2
✓ Branch 0 taken 18459 times.
✓ Branch 1 taken 5207 times.
 23666 if(s->remaining_size <= buf_size){
52
4/4
✓ Branch 0 taken 11556 times.
✓ Branch 1 taken 6903 times.
✓ Branch 2 taken 3095 times.
✓ Branch 3 taken 8461 times.
 18459 if(s->remaining_size && !s->need_next_header){
53 3095 i= s->remaining_size;
54 3095 s->remaining_size = 0;
55 }else{ //we need a header first
56 15364 len=0;
57
2/2
✓ Branch 0 taken 83220 times.
✓ Branch 1 taken 3766 times.
 86986 for(i=s->remaining_size; i<buf_size; i++){
58 83220 s->state = (s->state<<8) + buf[i];
59
2/2
✓ Branch 1 taken 11598 times.
✓ Branch 2 taken 71622 times.
 83220 if((len=s->sync(s->state, &s->need_next_header, &new_frame_start)))
60 11598 break;
61 }
62
2/2
✓ Branch 0 taken 3766 times.
✓ Branch 1 taken 11598 times.
 15364 if(len<=0){
63 3766 i=END_NOT_FOUND;
64 }else{
65 11598 got_frame = 1;
66 11598 s->state=0;
67 11598 i-= s->header_size -1;
68 11598 s->remaining_size = len;
69
4/4
✓ Branch 0 taken 10813 times.
✓ Branch 1 taken 785 times.
✓ Branch 2 taken 3173 times.
✓ Branch 3 taken 7640 times.
 11598 if(!new_frame_start || pc->index+i<=0){
70 3958 s->remaining_size += i;
71 3958 goto get_next;
72 }
73
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 7640 times.
 7640 else if (i < 0) {
74 ✗ s->remaining_size += i;
75 }
76 }
77 }
78 }
79
80
2/2
✓ Branch 1 taken 8788 times.
✓ Branch 2 taken 10920 times.
 19708 if(ff_combine_frame(pc, i, &buf, &buf_size)<0){
81 8788 s->remaining_size -= FFMIN(s->remaining_size, buf_size);
82 8788 *poutbuf = NULL;
83 8788 *poutbuf_size = 0;
84 8788 return buf_size;
85 }
86 }
87
88 11076 *poutbuf = buf;
89 11076 *poutbuf_size = buf_size;
90
91
2/2
✓ Branch 0 taken 10891 times.
✓ Branch 1 taken 185 times.
 11076 if (got_frame) {
92 int bit_rate;
93
94 /* Due to backwards compatible HE-AAC the sample rate, channel count,
95 and total number of samples found in an AAC ADTS header are not
96 reliable. Bit rate is still accurate because the total frame
97 duration in seconds is still correct (as is the number of bits in
98 the frame). */
99
2/2
✓ Branch 0 taken 7709 times.
✓ Branch 1 taken 3182 times.
 10891 if (avctx->codec_id != AV_CODEC_ID_AAC) {
100 #if CONFIG_AC3_PARSER
101 7709 AC3HeaderInfo hdr, *phrd = &hdr;
102 7709 int offset = ff_ac3_find_syncword(buf, buf_size);
103
104
2/2
✓ Branch 0 taken 7 times.
✓ Branch 1 taken 7702 times.
 7709 if (offset < 0)
105 11 return i;
106
107 7702 buf += offset;
108 7702 buf_size -= offset;
109
1/2
✓ Branch 0 taken 8483 times.
✗ Branch 1 not taken.
 8483 while (buf_size > 0) {
110 8483 int ret = avpriv_ac3_parse_header(&phrd, buf, buf_size);
111
112
4/4
✓ Branch 0 taken 8482 times.
✓ Branch 1 taken 1 times.
✓ Branch 2 taken 3 times.
✓ Branch 3 taken 8479 times.
 8483 if (ret < 0 || hdr.frame_size > buf_size)
113 4 return i;
114
115
2/2
✓ Branch 0 taken 781 times.
✓ Branch 1 taken 7698 times.
 8479 if (buf_size > hdr.frame_size) {
116 781 buf += hdr.frame_size;
117 781 buf_size -= hdr.frame_size;
118 781 continue;
119 }
120 /* Check for false positives since the syncword is not enough.
121 See section 6.1.2 of A/52. */
122
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 7698 times.
 7698 if (av_crc(s->crc_ctx, 0, buf + 2, hdr.frame_size - 2))
123 ✗ return i;
124 7698 break;
125 }
126
127 7698 avctx->sample_rate = hdr.sample_rate;
128
129
2/2
✓ Branch 0 taken 5849 times.
✓ Branch 1 taken 1849 times.
 7698 if (hdr.bitstream_id > 10)
130 5849 avctx->codec_id = AV_CODEC_ID_EAC3;
131
132
2/2
✓ Branch 0 taken 1849 times.
✓ Branch 1 taken 5849 times.
 7698 if (!CONFIG_EAC3_DECODER || avctx->codec_id != AV_CODEC_ID_EAC3) {
133 1849 av_channel_layout_uninit(&avctx->ch_layout);
134
1/2
✓ Branch 0 taken 1849 times.
✗ Branch 1 not taken.
 1849 if (hdr.channel_layout) {
135 1849 av_channel_layout_from_mask(&avctx->ch_layout, hdr.channel_layout);
136 } else {
137 ✗ avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
138 ✗ avctx->ch_layout.nb_channels = hdr.channels;
139 }
140 }
141 7698 s1->duration = hdr.num_blocks * 256;
142 7698 avctx->audio_service_type = hdr.bitstream_mode;
143
1/4
✗ Branch 0 not taken.
✓ Branch 1 taken 7698 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
 7698 if (hdr.bitstream_mode == 0x7 && hdr.channels > 1)
144 ✗ avctx->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
145 7698 bit_rate = hdr.bit_rate;
146 #endif
147 } else {
148 #if CONFIG_AAC_PARSER
149 AACADTSHeaderInfo hdr;
150
151
3/4
✓ Branch 0 taken 3181 times.
✓ Branch 1 taken 1 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 3181 times.
 6363 if (buf_size < AV_AAC_ADTS_HEADER_SIZE ||
152 3181 ff_adts_header_parse_buf(buf, &hdr) < 0)
153 1 return i;
154
155
2/2
✓ Branch 0 taken 33 times.
✓ Branch 1 taken 3148 times.
 3181 if (avctx->profile == AV_PROFILE_UNKNOWN)
156 33 avctx->profile = hdr.object_type - 1;
157 /* ADTS does not support USAC */
158 3181 s1->key_frame = 1;
159 3181 bit_rate = hdr.bit_rate;
160 #endif
161 }
162
163 /* Calculate the average bit rate */
164 10879 s->frame_number++;
165
2/2
✓ Branch 0 taken 5030 times.
✓ Branch 1 taken 5849 times.
 10879 if (!CONFIG_EAC3_DECODER || avctx->codec_id != AV_CODEC_ID_EAC3) {
166 5030 avctx->bit_rate +=
167 5030 (bit_rate - avctx->bit_rate) / s->frame_number;
168 }
169 }
170
171 11064 return i;
172 }
173