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"
30 int ff_adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, uint8_t *buf, int size)
34 MPEG4AudioConfig m4ac;
37 init_get_bits(&gb, buf, size * 8);
38 off = ff_mpeg4audio_get_config(&m4ac, buf, size);
41 skip_bits_long(&gb, off);
42 adts->objecttype = m4ac.object_type - 1;
43 adts->sample_rate_index = m4ac.sampling_index;
44 adts->channel_conf = m4ac.chan_config;
46 if (adts->objecttype > 3U) {
47 av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1);
50 if (adts->sample_rate_index == 15) {
51 av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n");
54 if (get_bits(&gb, 1)) {
55 av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n");
58 if (get_bits(&gb, 1)) {
59 av_log(s, AV_LOG_ERROR, "Scalable configurations are not allowed in ADTS\n");
62 if (!adts->channel_conf) {
63 init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE);
65 put_bits(&pb, 3, 5); //ID_PCE
66 adts->pce_size = (ff_copy_pce_data(&pb, &gb) + 3) / 8;
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 ff_adts_decode_extradata(s, adts, avc->extradata, avc->extradata_size) < 0)
87 int ff_adts_write_frame_header(ADTSContext *ctx,
88 uint8_t *buf, int size, int pce_size)
92 init_put_bits(&pb, buf, ADTS_HEADER_SIZE);
94 /* adts_fixed_header */
95 put_bits(&pb, 12, 0xfff); /* syncword */
96 put_bits(&pb, 1, 0); /* ID */
97 put_bits(&pb, 2, 0); /* layer */
98 put_bits(&pb, 1, 1); /* protection_absent */
99 put_bits(&pb, 2, ctx->objecttype); /* profile_objecttype */
100 put_bits(&pb, 4, ctx->sample_rate_index);
101 put_bits(&pb, 1, 0); /* private_bit */
102 put_bits(&pb, 3, ctx->channel_conf); /* channel_configuration */
103 put_bits(&pb, 1, 0); /* original_copy */
104 put_bits(&pb, 1, 0); /* home */
106 /* adts_variable_header */
107 put_bits(&pb, 1, 0); /* copyright_identification_bit */
108 put_bits(&pb, 1, 0); /* copyright_identification_start */
109 put_bits(&pb, 13, ADTS_HEADER_SIZE + size + pce_size); /* aac_frame_length */
110 put_bits(&pb, 11, 0x7ff); /* adts_buffer_fullness */
111 put_bits(&pb, 2, 0); /* number_of_raw_data_blocks_in_frame */
118 static int adts_write_packet(AVFormatContext *s, AVPacket *pkt)
120 ADTSContext *adts = s->priv_data;
121 ByteIOContext *pb = s->pb;
122 uint8_t buf[ADTS_HEADER_SIZE];
126 if (adts->write_adts) {
127 ff_adts_write_frame_header(adts, buf, pkt->size, adts->pce_size);
128 put_buffer(pb, buf, ADTS_HEADER_SIZE);
129 if (adts->pce_size) {
130 put_buffer(pb, adts->pce_data, adts->pce_size);
134 put_buffer(pb, pkt->data, pkt->size);
135 put_flush_packet(pb);
140 AVOutputFormat adts_muxer = {
142 NULL_IF_CONFIG_SMALL("ADTS AAC"),