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/bitstream.h"
24 #include "libavcodec/internal.h"
27 #define ADTS_HEADER_SIZE 7
32 int sample_rate_index;
36 static int decode_extradata(AVFormatContext *s, ADTSContext *adts, uint8_t *buf, int size)
40 init_get_bits(&gb, buf, size * 8);
41 adts->objecttype = get_bits(&gb, 5) - 1;
42 adts->sample_rate_index = get_bits(&gb, 4);
43 adts->channel_conf = get_bits(&gb, 4);
45 if (adts->objecttype > 3U) {
46 av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1);
49 if (adts->sample_rate_index == 15) {
50 av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n");
53 if (adts->channel_conf == 0) {
54 ff_log_missing_feature(s, "PCE based channel configuration", 0);
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 ff_log_missing_feature(s, "Signaled SBR or PS", 0);
75 static int adts_write_header(AVFormatContext *s)
77 ADTSContext *adts = s->priv_data;
78 AVCodecContext *avc = s->streams[0]->codec;
80 if(avc->extradata_size > 0 &&
81 decode_extradata(s, adts, avc->extradata, avc->extradata_size) < 0)
87 static int adts_write_frame_header(AVFormatContext *s, int size)
89 ADTSContext *ctx = s->priv_data;
91 uint8_t buf[ADTS_HEADER_SIZE];
93 init_put_bits(&pb, buf, ADTS_HEADER_SIZE);
95 /* adts_fixed_header */
96 put_bits(&pb, 12, 0xfff); /* syncword */
97 put_bits(&pb, 1, 0); /* ID */
98 put_bits(&pb, 2, 0); /* layer */
99 put_bits(&pb, 1, 1); /* protection_absent */
100 put_bits(&pb, 2, ctx->objecttype); /* profile_objecttype */
101 put_bits(&pb, 4, ctx->sample_rate_index);
102 put_bits(&pb, 1, 0); /* private_bit */
103 put_bits(&pb, 3, ctx->channel_conf); /* channel_configuration */
104 put_bits(&pb, 1, 0); /* original_copy */
105 put_bits(&pb, 1, 0); /* home */
107 /* adts_variable_header */
108 put_bits(&pb, 1, 0); /* copyright_identification_bit */
109 put_bits(&pb, 1, 0); /* copyright_identification_start */
110 put_bits(&pb, 13, ADTS_HEADER_SIZE + size); /* aac_frame_length */
111 put_bits(&pb, 11, 0x7ff); /* adts_buffer_fullness */
112 put_bits(&pb, 2, 0); /* number_of_raw_data_blocks_in_frame */
115 put_buffer(s->pb, buf, ADTS_HEADER_SIZE);
120 static int adts_write_packet(AVFormatContext *s, AVPacket *pkt)
122 ADTSContext *adts = s->priv_data;
123 ByteIOContext *pb = s->pb;
128 adts_write_frame_header(s, pkt->size);
129 put_buffer(pb, pkt->data, pkt->size);
130 put_flush_packet(pb);
135 AVOutputFormat adts_muxer = {
137 NULL_IF_CONFIG_SMALL("ADTS AAC"),