3 * Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
4 * Mans Rullgard <mans@mansr.com>
6 * This file is part of FFmpeg.
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.
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.
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
23 #include "libavcodec/get_bits.h"
24 #include "libavcodec/put_bits.h"
25 #include "libavcodec/avcodec.h"
26 #include "libavcodec/mpeg4audio.h"
27 #include "libavutil/opt.h"
32 #define ADTS_HEADER_SIZE 7
38 int sample_rate_index
;
43 uint8_t pce_data
[MAX_PCE_SIZE
];
46 #define ADTS_MAX_FRAME_BYTES ((1 << 13) - 1)
48 static int adts_decode_extradata(AVFormatContext
*s
, ADTSContext
*adts
, const uint8_t *buf
, int size
)
52 MPEG4AudioConfig m4ac
;
55 init_get_bits(&gb
, buf
, size
* 8);
56 off
= avpriv_mpeg4audio_get_config(&m4ac
, buf
, size
* 8, 1);
59 skip_bits_long(&gb
, off
);
60 adts
->objecttype
= m4ac
.object_type
- 1;
61 adts
->sample_rate_index
= m4ac
.sampling_index
;
62 adts
->channel_conf
= m4ac
.chan_config
;
64 if (adts
->objecttype
> 3U) {
65 av_log(s
, AV_LOG_ERROR
, "MPEG-4 AOT %d is not allowed in ADTS\n", adts
->objecttype
+1);
66 return AVERROR_INVALIDDATA
;
68 if (adts
->sample_rate_index
== 15) {
69 av_log(s
, AV_LOG_ERROR
, "Escape sample rate index illegal in ADTS\n");
70 return AVERROR_INVALIDDATA
;
72 if (get_bits(&gb
, 1)) {
73 av_log(s
, AV_LOG_ERROR
, "960/120 MDCT window is not allowed in ADTS\n");
74 return AVERROR_INVALIDDATA
;
76 if (get_bits(&gb
, 1)) {
77 av_log(s
, AV_LOG_ERROR
, "Scalable configurations are not allowed in ADTS\n");
78 return AVERROR_INVALIDDATA
;
80 if (get_bits(&gb
, 1)) {
81 av_log(s
, AV_LOG_ERROR
, "Extension flag is not allowed in ADTS\n");
82 return AVERROR_INVALIDDATA
;
84 if (!adts
->channel_conf
) {
85 init_put_bits(&pb
, adts
->pce_data
, MAX_PCE_SIZE
);
87 put_bits(&pb
, 3, 5); //ID_PCE
88 adts
->pce_size
= (avpriv_copy_pce_data(&pb
, &gb
) + 3) / 8;
97 static int adts_write_header(AVFormatContext
*s
)
99 ADTSContext
*adts
= s
->priv_data
;
100 AVCodecContext
*avc
= s
->streams
[0]->codec
;
103 ff_id3v2_write_simple(s
, 4, ID3v2_DEFAULT_MAGIC
);
104 if (avc
->extradata_size
> 0)
105 return adts_decode_extradata(s
, adts
, avc
->extradata
,
106 avc
->extradata_size
);
111 static int adts_write_frame_header(ADTSContext
*ctx
,
112 uint8_t *buf
, int size
, int pce_size
)
116 unsigned full_frame_size
= (unsigned)ADTS_HEADER_SIZE
+ size
+ pce_size
;
117 if (full_frame_size
> ADTS_MAX_FRAME_BYTES
) {
118 av_log(NULL
, AV_LOG_ERROR
, "ADTS frame size too large: %u (max %d)\n",
119 full_frame_size
, ADTS_MAX_FRAME_BYTES
);
120 return AVERROR_INVALIDDATA
;
123 init_put_bits(&pb
, buf
, ADTS_HEADER_SIZE
);
125 /* adts_fixed_header */
126 put_bits(&pb
, 12, 0xfff); /* syncword */
127 put_bits(&pb
, 1, 0); /* ID */
128 put_bits(&pb
, 2, 0); /* layer */
129 put_bits(&pb
, 1, 1); /* protection_absent */
130 put_bits(&pb
, 2, ctx
->objecttype
); /* profile_objecttype */
131 put_bits(&pb
, 4, ctx
->sample_rate_index
);
132 put_bits(&pb
, 1, 0); /* private_bit */
133 put_bits(&pb
, 3, ctx
->channel_conf
); /* channel_configuration */
134 put_bits(&pb
, 1, 0); /* original_copy */
135 put_bits(&pb
, 1, 0); /* home */
137 /* adts_variable_header */
138 put_bits(&pb
, 1, 0); /* copyright_identification_bit */
139 put_bits(&pb
, 1, 0); /* copyright_identification_start */
140 put_bits(&pb
, 13, full_frame_size
); /* aac_frame_length */
141 put_bits(&pb
, 11, 0x7ff); /* adts_buffer_fullness */
142 put_bits(&pb
, 2, 0); /* number_of_raw_data_blocks_in_frame */
149 static int adts_write_packet(AVFormatContext
*s
, AVPacket
*pkt
)
151 ADTSContext
*adts
= s
->priv_data
;
152 AVIOContext
*pb
= s
->pb
;
153 uint8_t buf
[ADTS_HEADER_SIZE
];
157 if (adts
->write_adts
) {
158 int err
= adts_write_frame_header(adts
, buf
, pkt
->size
,
162 avio_write(pb
, buf
, ADTS_HEADER_SIZE
);
163 if (adts
->pce_size
) {
164 avio_write(pb
, adts
->pce_data
, adts
->pce_size
);
168 avio_write(pb
, pkt
->data
, pkt
->size
);
173 static int adts_write_trailer(AVFormatContext
*s
)
175 ADTSContext
*adts
= s
->priv_data
;
183 #define ENC AV_OPT_FLAG_ENCODING_PARAM
184 #define OFFSET(obj) offsetof(ADTSContext, obj)
185 static const AVOption options
[] = {
186 { "write_id3v2", "Enable ID3v2 tag writing", OFFSET(id3v2tag
), AV_OPT_TYPE_INT
, {.i64
= 0}, 0, 1, ENC
},
187 { "write_apetag", "Enable APE tag writing", OFFSET(apetag
), AV_OPT_TYPE_INT
, {.i64
= 0}, 0, 1, ENC
},
191 static const AVClass adts_muxer_class
= {
192 .class_name
= "ADTS muxer",
193 .item_name
= av_default_item_name
,
195 .version
= LIBAVUTIL_VERSION_INT
,
198 AVOutputFormat ff_adts_muxer
= {
200 .long_name
= NULL_IF_CONFIG_SMALL("ADTS AAC (Advanced Audio Coding)"),
201 .mime_type
= "audio/aac",
202 .extensions
= "aac,adts",
203 .priv_data_size
= sizeof(ADTSContext
),
204 .audio_codec
= AV_CODEC_ID_AAC
,
205 .video_codec
= AV_CODEC_ID_NONE
,
206 .write_header
= adts_write_header
,
207 .write_packet
= adts_write_packet
,
208 .write_trailer
= adts_write_trailer
,
209 .priv_class
= &adts_muxer_class
,
210 .flags
= AVFMT_NOTIMESTAMPS
,