FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/aacdec.c
Date: 2026-04-23 02:20:26
Exec Total Coverage
Lines: 93 105 88.6%
Functions: 5 5 100.0%
Branches: 46 60 76.7%
Line Branch Exec Source
1 /*
2 * raw ADTS AAC demuxer
3 * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
4 * Copyright (c) 2009 Robert Swain ( rob opendot cl )
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 "libavutil/avassert.h"
24 #include "libavutil/intreadwrite.h"
25 #include "avformat.h"
26 #include "avio_internal.h"
27 #include "demux.h"
28 #include "internal.h"
29 #include "id3v1.h"
30 #include "id3v2.h"
31 #include "apetag.h"
32
33 #define ADTS_HEADER_SIZE 7
34
35 7474 static int adts_aac_probe(const AVProbeData *p)
36 {
37 7474 int max_frames = 0, first_frames = 0;
38 int fsize, frames;
39 7474 const uint8_t *buf0 = p->buf;
40 const uint8_t *buf2;
41 const uint8_t *buf;
42 7474 const uint8_t *end = buf0 + p->buf_size - 7;
43
44 7474 buf = buf0;
45
46
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 303166439 for (; buf < end; buf = buf2 + 1) {
47 303158965 buf2 = buf;
48
49
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 303196860 for (frames = 0; buf2 < end; frames++) {
50 303195050 uint32_t header = AV_RB16(buf2);
51
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 303195050 if ((header & 0xFFF6) != 0xFFF0) {
52
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 303155800 if (buf != buf0) {
53 // Found something that isn't an ADTS header, starting
54 // from a position other than the start of the buffer.
55 // Discard the count we've accumulated so far since it
56 // probably was a false positive.
57 303148353 frames = 0;
58 }
59 303155800 break;
60 }
61 39250 fsize = (AV_RB32(buf2 + 3) >> 13) & 0x1FFF;
62
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 39250 if (fsize < 7)
63 1355 break;
64 37895 fsize = FFMIN(fsize, end - buf2);
65 37895 buf2 += fsize;
66 }
67 303158965 max_frames = FFMAX(max_frames, frames);
68
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 303158965 if (buf == buf0)
69 7474 first_frames = frames;
70 }
71
72
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 7474 if (first_frames >= 3)
73 25 return AVPROBE_SCORE_EXTENSION + 1;
74
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 7449 else if (max_frames > 100)
75 ✗ return AVPROBE_SCORE_EXTENSION;
76
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 7449 else if (max_frames >= 3)
77 ✗ return AVPROBE_SCORE_EXTENSION / 2;
78
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 7449 else if (first_frames >= 1)
79 2 return 1;
80 else
81 7447 return 0;
82 }
83
84 31 static int adts_aac_resync(AVFormatContext *s)
85 {
86 uint16_t state;
87 31 int64_t start_pos = avio_tell(s->pb);
88
89 // skip data until an ADTS frame is found
90 31 state = avio_r8(s->pb);
91
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 402 while (!avio_feof(s->pb) &&
92
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 401 (avio_tell(s->pb) - start_pos) < s->probesize) {
93 401 state = (state << 8) | avio_r8(s->pb);
94
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 401 if ((state >> 4) != 0xFFF)
95 371 continue;
96 30 avio_seek(s->pb, -2, SEEK_CUR);
97 30 break;
98 }
99
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 31 if (s->pb->eof_reached)
100 1 return AVERROR_EOF;
101
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 30 if ((state >> 4) != 0xFFF)
102 ✗ return AVERROR_INVALIDDATA;
103
104 30 return 0;
105 }
106
107 30 static int adts_aac_read_header(AVFormatContext *s)
108 {
109 AVStream *st;
110 int ret;
111
112 30 st = avformat_new_stream(s, NULL);
113
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 30 if (!st)
114 ✗ return AVERROR(ENOMEM);
115
116 30 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
117 30 st->codecpar->codec_id = AV_CODEC_ID_AAC;
118 30 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
119
120 30 ff_id3v1_read(s);
121
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 60 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
122 30 !av_dict_count(s->metadata)) {
123 29 int64_t cur = avio_tell(s->pb);
124 29 ff_ape_parse_tag(s);
125 29 avio_seek(s->pb, cur, SEEK_SET);
126 }
127
128 30 ret = adts_aac_resync(s);
129
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 30 if (ret < 0)
130 ✗ return ret;
131
132 // LCM of all possible ADTS sample rates
133 30 avpriv_set_pts_info(st, 64, 1, 28224000);
134
135 30 return 0;
136 }
137
138 3 static int handle_id3(AVFormatContext *s, AVPacket *pkt)
139 {
140 3 AVDictionary *metadata = NULL;
141 FFIOContext pb;
142 ID3v2ExtraMeta *id3v2_extra_meta;
143 int ret;
144
145 3 ret = av_append_packet(s->pb, pkt, ff_id3v2_tag_len(pkt->data) - pkt->size);
146
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 3 if (ret < 0)
147 ✗ return ret;
148
149 3 ffio_init_read_context(&pb, pkt->data, pkt->size);
150 3 ff_id3v2_read_dict(&pb.pub, &metadata, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
151
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 3 if ((ret = ff_id3v2_parse_priv_dict(&metadata, id3v2_extra_meta)) < 0)
152 ✗ goto error;
153
154
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 3 if (metadata) {
155
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 3 if ((ret = av_dict_copy(&s->metadata, metadata, 0)) < 0)
156 ✗ goto error;
157 3 s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
158 }
159
160 ✗ error:
161 3 av_packet_unref(pkt);
162 3 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
163 3 av_dict_free(&metadata);
164
165 3 return ret;
166 }
167
168 5491 static int adts_aac_read_packet(AVFormatContext *s, AVPacket *pkt)
169 {
170 int ret, fsize;
171
172 5494 retry:
173 5494 ret = av_get_packet(s->pb, pkt, ADTS_HEADER_SIZE);
174
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 5494 if (ret < 0)
175 44 return ret;
176
177
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 5450 if (ret < ADTS_HEADER_SIZE)
178 ✗ return AVERROR_INVALIDDATA;
179
180
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 5450 if ((AV_RB16(pkt->data) >> 4) != 0xfff) {
181 // Parse all the ID3 headers between frames
182 4 int append = ID3v2_HEADER_SIZE - ADTS_HEADER_SIZE;
183
184 av_assert2(append > 0);
185 4 ret = av_append_packet(s->pb, pkt, append);
186
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 4 if (ret != append)
187 ✗ return AVERROR_INVALIDDATA;
188
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 4 if (!ff_id3v2_match(pkt->data, ID3v2_DEFAULT_MAGIC)) {
189 1 av_packet_unref(pkt);
190 1 ret = adts_aac_resync(s);
191 } else
192 3 ret = handle_id3(s, pkt);
193
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 4 if (ret < 0)
194 1 return ret;
195
196 3 goto retry;
197 }
198
199 5446 fsize = (AV_RB32(pkt->data + 3) >> 13) & 0x1FFF;
200
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 5446 if (fsize < ADTS_HEADER_SIZE)
201 ✗ return AVERROR_INVALIDDATA;
202
203 5446 ret = av_append_packet(s->pb, pkt, fsize - pkt->size);
204
205 5446 return ret;
206 }
207
208 const FFInputFormat ff_aac_demuxer = {
209 .p.name = "aac",
210 .p.long_name = NULL_IF_CONFIG_SMALL("raw ADTS AAC (Advanced Audio Coding)"),
211 .p.flags = AVFMT_GENERIC_INDEX,
212 .p.extensions = "aac",
213 .p.mime_type = "audio/aac,audio/aacp,audio/x-aac",
214 .flags_internal = FF_INFMT_FLAG_ID3V2_AUTO,
215 .read_probe = adts_aac_probe,
216 .read_header = adts_aac_read_header,
217 .read_packet = adts_aac_read_packet,
218 .raw_codec_id = AV_CODEC_ID_AAC,
219 };
220