FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/mpegaudio_parser.c
Date: 2025-10-24 21:16:34
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 "libavutil/common.h"
26 #include "libavformat/apetag.h" // for APE tag.
27 #include "libavformat/id3v1.h" // for ID3v1_TAG_SIZE
28
29 typedef struct MpegAudioParseContext {
30 ParseContext pc;
31 int frame_size;
32 uint32_t header;
33 int header_count;
34 int no_bitrate;
35 } MpegAudioParseContext;
36
37 #define MPA_HEADER_SIZE 4
38
39 /* header + layer + freq + lsf/mpeg25 */
40 #define SAME_HEADER_MASK \
41 (0xffe00000 | (3 << 17) | (3 << 10) | (3 << 19))
42
43 21420 static int mpegaudio_parse(AVCodecParserContext *s1,
44 AVCodecContext *avctx,
45 const uint8_t **poutbuf, int *poutbuf_size,
46 const uint8_t *buf, int buf_size)
47 {
48 21420 MpegAudioParseContext *s = s1->priv_data;
49 21420 ParseContext *pc = &s->pc;
50 21420 uint32_t state= pc->state;
51 int i;
52 21420 int next= END_NOT_FOUND;
53 21420 int flush = !buf_size;
54
55
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 43309 for(i=0; i<buf_size; ){
56
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 39617 if(s->frame_size){
57 20943 int inc= FFMIN(buf_size - i, s->frame_size);
58 20943 i += inc;
59 20943 s->frame_size -= inc;
60 20943 state = 0;
61
62
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 20943 if(!s->frame_size){
63 17728 next= i;
64 17728 break;
65 }
66 }else{
67
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 289780 while(i<buf_size){
68 int ret, sr, channels, bit_rate, frame_size;
69 289432 enum AVCodecID codec_id = avctx->codec_id;
70
71 289432 state= (state<<8) + buf[i++];
72
73 289432 ret = ff_mpa_decode_header(state, &sr, &channels, &frame_size, &bit_rate, &codec_id);
74
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 289432 if (ret < 4) {
75
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 271106 if (i > 4)
76 216472 s->header_count = -2;
77 } else {
78
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 18326 int header_threshold = avctx->codec_id != AV_CODEC_ID_NONE && avctx->codec_id != codec_id;
79
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 18326 if((state&SAME_HEADER_MASK) != (s->header&SAME_HEADER_MASK) && s->header)
80 179 s->header_count= -3;
81 18326 s->header= state;
82 18326 s->header_count++;
83 18326 s->frame_size = ret-4;
84
85
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 18326 if (s->header_count > header_threshold) {
86 17816 avctx->sample_rate= sr;
87 17816 av_channel_layout_uninit(&avctx->ch_layout);
88 17816 av_channel_layout_default(&avctx->ch_layout, channels);
89 17816 s1->duration = frame_size;
90 17816 avctx->codec_id = codec_id;
91
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 17816 if (s->no_bitrate || !avctx->bit_rate) {
92 12106 s->no_bitrate = 1;
93 12106 avctx->bit_rate += (bit_rate - avctx->bit_rate) / (s->header_count - header_threshold);
94 }
95 }
96
97
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 18326 if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES) {
98 469 s->frame_size = 0;
99 469 next = buf_size;
100
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 17857 } else if (codec_id == AV_CODEC_ID_MP3ADU) {
101 ✗ avpriv_report_missing_feature(avctx,
102 "MP3ADU full parser");
103 ✗ *poutbuf = NULL;
104 ✗ *poutbuf_size = 0;
105 ✗ return buf_size; /* parsers must not return error codes */
106 }
107
108 18326 break;
109 }
110 }
111 }
112 }
113
114 21420 pc->state= state;
115
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 21420 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
116 3226 *poutbuf = NULL;
117 3226 *poutbuf_size = 0;
118 3226 return buf_size;
119 }
120
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 18194 if (flush && buf_size >= ID3v1_TAG_SIZE && memcmp(buf, "TAG", 3) == 0) {
122 6 *poutbuf = NULL;
123 6 *poutbuf_size = 0;
124 6 return next;
125 }
126
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 18188 if (flush && buf_size >= APE_TAG_FOOTER_BYTES && memcmp(buf, APE_TAG_PREAMBLE, 8) == 0) {
128 ✗ *poutbuf = NULL;
129 ✗ *poutbuf_size = 0;
130 ✗ return next;
131 }
132
133 18188 *poutbuf = buf;
134 18188 *poutbuf_size = buf_size;
135 18188 return next;
136 }
137
138
139 const AVCodecParser ff_mpegaudio_parser = {
140 .codec_ids = { AV_CODEC_ID_MP1, AV_CODEC_ID_MP2, AV_CODEC_ID_MP3, AV_CODEC_ID_MP3ADU },
141 .priv_data_size = sizeof(MpegAudioParseContext),
142 .parser_parse = mpegaudio_parse,
143 .parser_close = ff_parse_close,
144 };
145