FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/aac_ac3_parser.c
Date: 2026-10-30 17:37:53
Exec Total Coverage
Lines: 77 82 93.9%
Functions: 1 1 100.0%
Branches: 49 56 87.5%
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 21277 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 21277 AACAC3ParseContext *s = s1->priv_data;
38 21277 ParseContext *pc = &s->pc;
39 int len, i;
40 int new_frame_start;
41 21277 int got_frame = 0;
42
43 21277 s1->key_frame = -1;
44
45
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 21277 if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES) {
46 207 i = buf_size;
47 207 got_frame = 1;
48 } else {
49 21070 get_next:
50 26367 i=END_NOT_FOUND;
51
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 26367 if(s->remaining_size <= buf_size){
52
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 21160 if(s->remaining_size && !s->need_next_header){
53 4434 i= s->remaining_size;
54 4434 s->remaining_size = 0;
55 }else{ //we need a header first
56 16726 len=0;
57
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 96382 for(i=s->remaining_size; i<buf_size; i++){
58 92593 s->state = (s->state<<8) + buf[i];
59
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 92593 if((len=s->sync(s->state, &s->need_next_header, &new_frame_start)))
60 12937 break;
61 }
62
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 16726 if(len<=0){
63 3789 i=END_NOT_FOUND;
64 }else{
65 12937 got_frame = 1;
66 12937 s->state=0;
67 12937 i-= s->header_size -1;
68 12937 s->remaining_size = len;
69
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 12937 if(!new_frame_start || pc->index+i<=0){
70 5297 s->remaining_size += i;
71 5297 goto get_next;
72 }
73
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 7640 else if (i < 0) {
74 ✗ s->remaining_size += i;
75 }
76 }
77 }
78 }
79
80
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 21070 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 12489 *poutbuf = buf;
89 12489 *poutbuf_size = buf_size;
90
91
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 12489 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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 12281 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
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 7709 if (offset < 0)
105 11 return i;
106
107 7702 buf += offset;
108 7702 buf_size -= offset;
109
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 8483 while (buf_size > 0) {
110 8483 int ret = avpriv_ac3_parse_header(&phrd, buf, buf_size);
111
112
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 8483 if (ret < 0 || hdr.frame_size > buf_size)
113 4 return i;
114
115
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 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
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 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
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 7698 if (hdr.bitstream_id > 10)
130 5849 avctx->codec_id = AV_CODEC_ID_EAC3;
131
132
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 7698 if (!CONFIG_EAC3_DECODER || avctx->codec_id != AV_CODEC_ID_EAC3) {
133 1849 av_channel_layout_uninit(&avctx->ch_layout);
134
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 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
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 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
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 9136 if (buf_size < AV_AAC_ADTS_HEADER_SIZE ||
152 4564 ff_adts_header_parse_buf(buf, &hdr) < 0)
153 52 return i;
154
155
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 4520 if (avctx->profile == AV_PROFILE_UNKNOWN)
156 61 avctx->profile = hdr.object_type - 1;
157 /* ADTS does not support USAC */
158 4520 s1->key_frame = 1;
159 4520 bit_rate = hdr.bit_rate;
160 #endif
161 }
162
163 /* Calculate the average bit rate */
164 12218 s->frame_number++;
165
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 12218 if (!CONFIG_EAC3_DECODER || avctx->codec_id != AV_CODEC_ID_EAC3) {
166 6369 avctx->bit_rate +=
167 6369 (bit_rate - avctx->bit_rate) / s->frame_number;
168 }
169 }
170
171 12426 return i;
172 }
173