FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/aac_adtstoasc_bsf.c
Date: 2021-09-22 05:58:22
Exec Total Coverage
Lines: 33 66 50.0%
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 "internal.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 */
39 241 static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *pkt)
40 {
41 241 AACBSFContext *ctx = bsfc->priv_data;
42
43 GetBitContext gb;
44 PutBitContext pb;
45 AACADTSHeaderInfo hdr;
46 int ret;
47
48 241 ret = ff_bsf_get_packet_ref(bsfc, pkt);
49
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241 if (ret < 0)
50 121 return ret;
51
52
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120 if (bsfc->par_in->extradata && pkt->size >= 2 && (AV_RB16(pkt->data) >> 4) != 0xfff)
53 return 0;
54
55
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120 if (pkt->size < AV_AAC_ADTS_HEADER_SIZE)
56 goto packet_too_small;
57
58 120 init_get_bits(&gb, pkt->data, AV_AAC_ADTS_HEADER_SIZE * 8);
59
60
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120 if (ff_adts_header_parse(&gb, &hdr) < 0) {
61 av_log(bsfc, AV_LOG_ERROR, "Error parsing ADTS frame header!\n");
62 ret = AVERROR_INVALIDDATA;
63 goto fail;
64 }
65
66
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120 if (!hdr.crc_absent && hdr.num_aac_frames > 1) {
67 avpriv_report_missing_feature(bsfc,
68 "Multiple RDBs per frame with CRC");
69 ret = AVERROR_PATCHWELCOME;
70 goto fail;
71 }
72
73
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120 pkt->size -= AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
74
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120 if (pkt->size <= 0)
75 goto packet_too_small;
76
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120 pkt->data += AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
77
78
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120 if (!ctx->first_frame_done) {
79 2 int pce_size = 0;
80 uint8_t pce_data[MAX_PCE_SIZE];
81 uint8_t *extradata;
82
83
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2 if (!hdr.chan_config) {
84 init_get_bits(&gb, pkt->data, pkt->size * 8);
85 if (get_bits(&gb, 3) != 5) {
86 avpriv_report_missing_feature(bsfc,
87 "PCE-based channel configuration "
88 "without PCE as first syntax "
89 "element");
90 ret = AVERROR_PATCHWELCOME;
91 goto fail;
92 }
93 init_put_bits(&pb, pce_data, MAX_PCE_SIZE);
94 pce_size = ff_copy_pce_data(&pb, &gb) / 8;
95 flush_put_bits(&pb);
96 pkt->size -= get_bits_count(&gb)/8;
97 pkt->data += get_bits_count(&gb)/8;
98 }
99
100 2 extradata = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
101 2 2 + pce_size);
102
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2 if (!extradata) {
103 ret = AVERROR(ENOMEM);
104 goto fail;
105 }
106
107 2 init_put_bits(&pb, extradata, 2 + pce_size);
108 2 put_bits(&pb, 5, hdr.object_type);
109 2 put_bits(&pb, 4, hdr.sampling_index);
110 2 put_bits(&pb, 4, hdr.chan_config);
111 2 put_bits(&pb, 1, 0); //frame length - 1024 samples
112 2 put_bits(&pb, 1, 0); //does not depend on core coder
113 2 put_bits(&pb, 1, 0); //is not extension
114 2 flush_put_bits(&pb);
115
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2 if (pce_size) {
116 memcpy(extradata + 2, pce_data, pce_size);
117 }
118
119 2 ctx->first_frame_done = 1;
120 }
121
122 120 return 0;
123
124 packet_too_small:
125 av_log(bsfc, AV_LOG_ERROR, "Input packet too small\n");
126 ret = AVERROR_INVALIDDATA;
127 fail:
128 av_packet_unref(pkt);
129 return ret;
130 }
131
132 2 static int aac_adtstoasc_init(AVBSFContext *ctx)
133 {
134 /* Validate the extradata if the stream is already MPEG-4 AudioSpecificConfig */
135
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2 if (ctx->par_in->extradata) {
136 MPEG4AudioConfig mp4ac;
137 int ret = avpriv_mpeg4audio_get_config2(&mp4ac, ctx->par_in->extradata,
138 ctx->par_in->extradata_size, 1, ctx);
139 if (ret < 0) {
140 av_log(ctx, AV_LOG_ERROR, "Error parsing AudioSpecificConfig extradata!\n");
141 return ret;
142 }
143 }
144
145 2 return 0;
146 }
147
148 static const enum AVCodecID codec_ids[] = {
149 AV_CODEC_ID_AAC, AV_CODEC_ID_NONE,
150 };
151
152 const AVBitStreamFilter ff_aac_adtstoasc_bsf = {
153 .name = "aac_adtstoasc",
154 .priv_data_size = sizeof(AACBSFContext),
155 .init = aac_adtstoasc_init,
156 .filter = aac_adtstoasc_filter,
157 .codec_ids = codec_ids,
158 };
159