FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/mpegaudio_parser.c
Date: 2026-08-11 17:55:23
Exec Total Coverage
Lines: 55 62 88.7%
Functions: 1 1 100.0%
Branches: 41 44 93.2%
Line Branch Exec Source
1 /*
2 * MPEG Audio 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 "parser.h"
24 #include "mpegaudiodecheader.h"
25 #include "parser_internal.h"
26 #include "libavutil/common.h"
27 #include "libavformat/apetag.h" // for APE tag.
28 #include "libavformat/id3v1.h" // for ID3v1_TAG_SIZE
29
30 typedef struct MpegAudioParseContext {
31 ParseContext pc;
32 int frame_size;
33 uint32_t header;
34 int header_count;
35 int no_bitrate;
36 } MpegAudioParseContext;
37
38 #define MPA_HEADER_SIZE 4
39
40 /* header + layer + freq + lsf/mpeg25 */
41 #define SAME_HEADER_MASK \
42 (0xffe00000 | (3 << 17) | (3 << 10) | (3 << 19))
43
44 26182 static int mpegaudio_parse(AVCodecParserContext *s1,
45 AVCodecContext *avctx,
46 const uint8_t **poutbuf, int *poutbuf_size,
47 const uint8_t *buf, int buf_size)
48 {
49 26182 MpegAudioParseContext *s = s1->priv_data;
50 26182 ParseContext *pc = &s->pc;
51 26182 uint32_t state= pc->state;
52 int i;
53 26182 int next= END_NOT_FOUND;
54 26182 int flush = !buf_size;
55
56
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 52815 for(i=0; i<buf_size; ){
57
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 47957 if(s->frame_size){
58 25671 int inc= FFMIN(buf_size - i, s->frame_size);
59 25671 i += inc;
60 25671 s->frame_size -= inc;
61 25671 state = 0;
62
63
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 25671 if(!s->frame_size){
64 21324 next= i;
65 21324 break;
66 }
67 }else{
68
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 306000 while(i<buf_size){
69 int ret, sr, channels, bit_rate, frame_size;
70 305648 enum AVCodecID codec_id = avctx->codec_id;
71
72 305648 state= (state<<8) + buf[i++];
73
74 305648 ret = ff_mpa_decode_header(state, &sr, &channels, &frame_size, &bit_rate, &codec_id);
75
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 305648 if (ret < 4) {
76
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 283714 if (i > 4)
77 218248 s->header_count = -2;
78 } else {
79
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 21934 int header_threshold = avctx->codec_id != AV_CODEC_ID_NONE && avctx->codec_id != codec_id;
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 21934 if((state&SAME_HEADER_MASK) != (s->header&SAME_HEADER_MASK) && s->header)
81 179 s->header_count= -3;
82 21934 s->header= state;
83 21934 s->header_count++;
84 21934 s->frame_size = ret-4;
85
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 21934 if (s->header_count > header_threshold) {
87 21420 avctx->sample_rate= sr;
88 21420 av_channel_layout_uninit(&avctx->ch_layout);
89 21420 av_channel_layout_default(&avctx->ch_layout, channels);
90 21420 s1->duration = frame_size;
91 21420 avctx->codec_id = codec_id;
92
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 21420 if (s->no_bitrate || !avctx->bit_rate) {
93 15116 s->no_bitrate = 1;
94 15116 avctx->bit_rate += (bit_rate - avctx->bit_rate) / (s->header_count - header_threshold);
95 }
96 }
97
98
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 21934 if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES) {
99 471 s->frame_size = 0;
100 471 next = buf_size;
101
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 21463 } else if (codec_id == AV_CODEC_ID_MP3ADU) {
102 ✗ avpriv_report_missing_feature(avctx,
103 "MP3ADU full parser");
104 ✗ *poutbuf = NULL;
105 ✗ *poutbuf_size = 0;
106 ✗ return buf_size; /* parsers must not return error codes */
107 }
108
109 21934 break;
110 }
111 }
112 }
113 }
114
115 26182 pc->state= state;
116
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 26182 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
117 4360 *poutbuf = NULL;
118 4360 *poutbuf_size = 0;
119 4360 return buf_size;
120 }
121
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 21822 if (flush && buf_size >= ID3v1_TAG_SIZE && memcmp(buf, "TAG", 3) == 0) {
123 8 *poutbuf = NULL;
124 8 *poutbuf_size = 0;
125 8 return next;
126 }
127
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 21814 if (flush && buf_size >= APE_TAG_FOOTER_BYTES && memcmp(buf, APE_TAG_PREAMBLE, 8) == 0) {
129 ✗ *poutbuf = NULL;
130 ✗ *poutbuf_size = 0;
131 ✗ return next;
132 }
133
134 21814 *poutbuf = buf;
135 21814 *poutbuf_size = buf_size;
136 21814 return next;
137 }
138
139
140 const FFCodecParser ff_mpegaudio_parser = {
141 PARSER_CODEC_LIST(AV_CODEC_ID_MP1, AV_CODEC_ID_MP2,
142 AV_CODEC_ID_MP3, AV_CODEC_ID_MP3ADU),
143 .priv_data_size = sizeof(MpegAudioParseContext),
144 .parse = mpegaudio_parse,
145 .close = ff_parse_close,
146 };
147