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/mpeg4audio.h"
28 #define ADTS_HEADER_SIZE 7
33 int sample_rate_index
;
36 uint8_t pce_data
[MAX_PCE_SIZE
];
39 static int decode_extradata(AVFormatContext
*s
, ADTSContext
*adts
, uint8_t *buf
, int size
)
44 init_get_bits(&gb
, buf
, size
* 8);
45 adts
->objecttype
= get_bits(&gb
, 5) - 1;
46 adts
->sample_rate_index
= get_bits(&gb
, 4);
47 adts
->channel_conf
= get_bits(&gb
, 4);
49 if (adts
->objecttype
> 3U) {
50 av_log(s
, AV_LOG_ERROR
, "MPEG-4 AOT %d is not allowed in ADTS\n", adts
->objecttype
+1);
53 if (adts
->sample_rate_index
== 15) {
54 av_log(s
, AV_LOG_ERROR
, "Escape sample rate index illegal in ADTS\n");
57 if (get_bits(&gb
, 1)) {
58 av_log(s
, AV_LOG_ERROR
, "960/120 MDCT window is not allowed in ADTS\n");
61 if (get_bits(&gb
, 1)) {
62 av_log(s
, AV_LOG_ERROR
, "Scalable configurations are not allowed in ADTS\n");
65 if (get_bits(&gb
, 1)) {
66 av_log(s
, AV_LOG_ERROR
, "Signaled SBR or PS is not supported\n");
69 if (!adts
->channel_conf
) {
70 init_put_bits(&pb
, adts
->pce_data
, MAX_PCE_SIZE
);
72 put_bits(&pb
, 3, 5); //ID_PCE
73 adts
->pce_size
= (ff_copy_pce_data(&pb
, &gb
) + 3) / 8;
82 static int adts_write_header(AVFormatContext
*s
)
84 ADTSContext
*adts
= s
->priv_data
;
85 AVCodecContext
*avc
= s
->streams
[0]->codec
;
87 if(avc
->extradata_size
> 0 &&
88 decode_extradata(s
, adts
, avc
->extradata
, avc
->extradata_size
) < 0)
94 static int adts_write_frame_header(AVFormatContext
*s
, int size
)
96 ADTSContext
*ctx
= s
->priv_data
;
98 uint8_t buf
[ADTS_HEADER_SIZE
];
100 init_put_bits(&pb
, buf
, ADTS_HEADER_SIZE
);
102 /* adts_fixed_header */
103 put_bits(&pb
, 12, 0xfff); /* syncword */
104 put_bits(&pb
, 1, 0); /* ID */
105 put_bits(&pb
, 2, 0); /* layer */
106 put_bits(&pb
, 1, 1); /* protection_absent */
107 put_bits(&pb
, 2, ctx
->objecttype
); /* profile_objecttype */
108 put_bits(&pb
, 4, ctx
->sample_rate_index
);
109 put_bits(&pb
, 1, 0); /* private_bit */
110 put_bits(&pb
, 3, ctx
->channel_conf
); /* channel_configuration */
111 put_bits(&pb
, 1, 0); /* original_copy */
112 put_bits(&pb
, 1, 0); /* home */
114 /* adts_variable_header */
115 put_bits(&pb
, 1, 0); /* copyright_identification_bit */
116 put_bits(&pb
, 1, 0); /* copyright_identification_start */
117 put_bits(&pb
, 13, ADTS_HEADER_SIZE
+ size
+ ctx
->pce_size
); /* aac_frame_length */
118 put_bits(&pb
, 11, 0x7ff); /* adts_buffer_fullness */
119 put_bits(&pb
, 2, 0); /* number_of_raw_data_blocks_in_frame */
122 put_buffer(s
->pb
, buf
, ADTS_HEADER_SIZE
);
124 put_buffer(s
->pb
, ctx
->pce_data
, ctx
->pce_size
);
131 static int adts_write_packet(AVFormatContext
*s
, AVPacket
*pkt
)
133 ADTSContext
*adts
= s
->priv_data
;
134 ByteIOContext
*pb
= s
->pb
;
139 adts_write_frame_header(s
, pkt
->size
);
140 put_buffer(pb
, pkt
->data
, pkt
->size
);
141 put_flush_packet(pb
);
146 AVOutputFormat adts_muxer
= {
148 NULL_IF_CONFIG_SMALL("ADTS AAC"),