FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/aac_ac3_parser.c
Date: 2026-01-16 07:34:38
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 18140 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 18140 AACAC3ParseContext *s = s1->priv_data;
38 18140 ParseContext *pc = &s->pc;
39 int len, i;
40 int new_frame_start;
41 18140 int got_frame = 0;
42
43 18140 s1->key_frame = -1;
44
45
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 18140 if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES) {
46 156 i = buf_size;
47 156 got_frame = 1;
48 } else {
49 17984 get_next:
50 23810 i=END_NOT_FOUND;
51
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 23810 if(s->remaining_size <= buf_size){
52
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 19791 if(s->remaining_size && !s->need_next_header){
53 5444 i= s->remaining_size;
54 5444 s->remaining_size = 0;
55 }else{ //we need a header first
56 14347 len=0;
57
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 88171 for(i=s->remaining_size; i<buf_size; i++){
58 85789 s->state = (s->state<<8) + buf[i];
59
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 85789 if((len=s->sync(s->state, &s->need_next_header, &new_frame_start)))
60 11965 break;
61 }
62
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 14347 if(len<=0){
63 2382 i=END_NOT_FOUND;
64 }else{
65 11965 got_frame = 1;
66 11965 s->state=0;
67 11965 i-= s->header_size -1;
68 11965 s->remaining_size = len;
69
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 11965 if(!new_frame_start || pc->index+i<=0){
70 5826 s->remaining_size += i;
71 5826 goto get_next;
72 }
73
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 6139 else if (i < 0) {
74 ✗ s->remaining_size += i;
75 }
76 }
77 }
78 }
79
80
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 17984 if(ff_combine_frame(pc, i, &buf, &buf_size)<0){
81 6241 s->remaining_size -= FFMIN(s->remaining_size, buf_size);
82 6241 *poutbuf = NULL;
83 6241 *poutbuf_size = 0;
84 6241 return buf_size;
85 }
86 }
87
88 11899 *poutbuf = buf;
89 11899 *poutbuf_size = buf_size;
90
91
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 11899 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
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 11739 if (avctx->codec_id != AV_CODEC_ID_AAC) {
100 #if CONFIG_AC3_PARSER
101 6208 AC3HeaderInfo hdr, *phrd = &hdr;
102 6208 int offset = ff_ac3_find_syncword(buf, buf_size);
103
104
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 6208 if (offset < 0)
105 11 return i;
106
107 6201 buf += offset;
108 6201 buf_size -= offset;
109
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 6514 while (buf_size > 0) {
110 6514 int ret = avpriv_ac3_parse_header(&phrd, buf, buf_size);
111
112
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 6514 if (ret < 0 || hdr.frame_size > buf_size)
113 4 return i;
114
115
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 6510 if (buf_size > hdr.frame_size) {
116 313 buf += hdr.frame_size;
117 313 buf_size -= hdr.frame_size;
118 313 continue;
119 }
120 /* Check for false positives since the syncword is not enough.
121 See section 6.1.2 of A/52. */
122
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 6197 if (av_crc(s->crc_ctx, 0, buf + 2, hdr.frame_size - 2))
123 ✗ return i;
124 6197 break;
125 }
126
127 6197 avctx->sample_rate = hdr.sample_rate;
128
129
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 6197 if (hdr.bitstream_id > 10)
130 4592 avctx->codec_id = AV_CODEC_ID_EAC3;
131
132
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 6197 if (!CONFIG_EAC3_DECODER || avctx->codec_id != AV_CODEC_ID_EAC3) {
133 1605 av_channel_layout_uninit(&avctx->ch_layout);
134
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 1605 if (hdr.channel_layout) {
135 1605 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 6197 s1->duration = hdr.num_blocks * 256;
142 6197 avctx->audio_service_type = hdr.bitstream_mode;
143
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 6197 if (hdr.bitstream_mode == 0x7 && hdr.channels > 1)
144 ✗ avctx->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
145 6197 bit_rate = hdr.bit_rate;
146 #endif
147 } else {
148 #if CONFIG_AAC_PARSER
149 AACADTSHeaderInfo hdr;
150
151
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 11061 if (buf_size < AV_AAC_ADTS_HEADER_SIZE ||
152 5530 ff_adts_header_parse_buf(buf, &hdr) < 0)
153 1 return i;
154
155
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 5530 if (avctx->profile == AV_PROFILE_UNKNOWN)
156 31 avctx->profile = hdr.object_type - 1;
157 /* ADTS does not support USAC */
158 5530 s1->key_frame = 1;
159 5530 bit_rate = hdr.bit_rate;
160 #endif
161 }
162
163 /* Calculate the average bit rate */
164 11727 s->frame_number++;
165
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 11727 if (!CONFIG_EAC3_DECODER || avctx->codec_id != AV_CODEC_ID_EAC3) {
166 7135 avctx->bit_rate +=
167 7135 (bit_rate - avctx->bit_rate) / s->frame_number;
168 }
169 }
170
171 11887 return i;
172 }
173