FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/bsf/aac_adtstoasc.c
Date: 2026-01-14 03:33:33
Exec Total Coverage
Lines: 32 65 49.2%
Functions: 2 2 100.0%
Branches: 15 36 41.7%
Line Branch Exec Source
1 /*
2 * MPEG-2/4 AAC ADTS to MPEG-4 Audio Specific Configuration bitstream filter
3 * Copyright (c) 2009 Alex Converse <alex.converse@gmail.com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "adts_header.h"
23 #include "adts_parser.h"
24 #include "bsf.h"
25 #include "bsf_internal.h"
26 #include "put_bits.h"
27 #include "get_bits.h"
28 #include "mpeg4audio.h"
29 #include "mpeg4audio_copy_pce.h"
30
31 typedef struct AACBSFContext {
32 int first_frame_done;
33 } AACBSFContext;
34
35 /**
36 * This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4
37 * ADTS header and removes the ADTS header.
38 */
39 242 static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *pkt)
40 {
41 242 AACBSFContext *ctx = bsfc->priv_data;
42
43 PutBitContext pb;
44 AACADTSHeaderInfo hdr;
45 int ret;
46
47 242 ret = ff_bsf_get_packet_ref(bsfc, pkt);
48
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 242 if (ret < 0)
49 122 return ret;
50
51
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 120 if (bsfc->par_in->extradata && pkt->size >= 2 && (AV_RB16(pkt->data) >> 4) != 0xfff)
52 ✗ return 0;
53
54
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 120 if (pkt->size < AV_AAC_ADTS_HEADER_SIZE)
55 ✗ goto packet_too_small;
56
57
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 120 if (ff_adts_header_parse_buf(pkt->data, &hdr) < 0) {
58 ✗ av_log(bsfc, AV_LOG_ERROR, "Error parsing ADTS frame header!\n");
59 ✗ ret = AVERROR_INVALIDDATA;
60 ✗ goto fail;
61 }
62
63
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 120 if (!hdr.crc_absent && hdr.num_aac_frames > 1) {
64 ✗ avpriv_report_missing_feature(bsfc,
65 "Multiple RDBs per frame with CRC");
66 ✗ ret = AVERROR_PATCHWELCOME;
67 ✗ goto fail;
68 }
69
70
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 120 pkt->size -= AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
71
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 120 if (pkt->size <= 0)
72 ✗ goto packet_too_small;
73
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 120 pkt->data += AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
74
75
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 120 if (!ctx->first_frame_done) {
76 2 int pce_size = 0;
77 uint8_t pce_data[MAX_PCE_SIZE];
78 uint8_t *extradata;
79
80
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 2 if (!hdr.chan_config) {
81 GetBitContext gb;
82 ✗ init_get_bits(&gb, pkt->data, pkt->size * 8);
83 ✗ if (get_bits(&gb, 3) != 5) {
84 ✗ avpriv_report_missing_feature(bsfc,
85 "PCE-based channel configuration "
86 "without PCE as first syntax "
87 "element");
88 ✗ ret = AVERROR_PATCHWELCOME;
89 ✗ goto fail;
90 }
91 ✗ init_put_bits(&pb, pce_data, MAX_PCE_SIZE);
92 ✗ pce_size = ff_copy_pce_data(&pb, &gb) / 8;
93 ✗ flush_put_bits(&pb);
94 ✗ pkt->size -= get_bits_count(&gb)/8;
95 ✗ pkt->data += get_bits_count(&gb)/8;
96 }
97
98 2 extradata = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
99 2 2 + pce_size);
100
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 2 if (!extradata) {
101 ✗ ret = AVERROR(ENOMEM);
102 ✗ goto fail;
103 }
104
105 2 init_put_bits(&pb, extradata, 2 + pce_size);
106 2 put_bits(&pb, 5, hdr.object_type);
107 2 put_bits(&pb, 4, hdr.sampling_index);
108 2 put_bits(&pb, 4, hdr.chan_config);
109 2 put_bits(&pb, 1, 0); //frame length - 1024 samples
110 2 put_bits(&pb, 1, 0); //does not depend on core coder
111 2 put_bits(&pb, 1, 0); //is not extension
112 2 flush_put_bits(&pb);
113
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 2 if (pce_size) {
114 ✗ memcpy(extradata + 2, pce_data, pce_size);
115 }
116
117 2 ctx->first_frame_done = 1;
118 }
119
120 120 return 0;
121
122 ✗ packet_too_small:
123 ✗ av_log(bsfc, AV_LOG_ERROR, "Input packet too small\n");
124 ✗ ret = AVERROR_INVALIDDATA;
125 ✗ fail:
126 ✗ av_packet_unref(pkt);
127 ✗ return ret;
128 }
129
130 2 static int aac_adtstoasc_init(AVBSFContext *ctx)
131 {
132 /* Validate the extradata if the stream is already MPEG-4 AudioSpecificConfig */
133
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 2 if (ctx->par_in->extradata) {
134 MPEG4AudioConfig mp4ac;
135 ✗ int ret = avpriv_mpeg4audio_get_config2(&mp4ac, ctx->par_in->extradata,
136 ✗ ctx->par_in->extradata_size, 1, ctx);
137 ✗ if (ret < 0) {
138 ✗ av_log(ctx, AV_LOG_ERROR, "Error parsing AudioSpecificConfig extradata!\n");
139 ✗ return ret;
140 }
141 }
142
143 2 return 0;
144 }
145
146 static const enum AVCodecID codec_ids[] = {
147 AV_CODEC_ID_AAC, AV_CODEC_ID_NONE,
148 };
149
150 const FFBitStreamFilter ff_aac_adtstoasc_bsf = {
151 .p.name = "aac_adtstoasc",
152 .p.codec_ids = codec_ids,
153 .priv_data_size = sizeof(AACBSFContext),
154 .init = aac_adtstoasc_init,
155 .filter = aac_adtstoasc_filter,
156 };
157