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"
29 #define ADTS_HEADER_SIZE 7
34 int sample_rate_index;
37 uint8_t pce_data[MAX_PCE_SIZE];
40 static int decode_extradata(AVFormatContext *s, ADTSContext *adts, uint8_t *buf, int size)
45 init_get_bits(&gb, buf, size * 8);
46 adts->objecttype = get_bits(&gb, 5) - 1;
47 adts->sample_rate_index = get_bits(&gb, 4);
48 adts->channel_conf = get_bits(&gb, 4);
50 if (adts->objecttype > 3U) {
51 av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1);
54 if (adts->sample_rate_index == 15) {
55 av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n");
58 if (get_bits(&gb, 1)) {
59 av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n");
62 if (get_bits(&gb, 1)) {
63 av_log(s, AV_LOG_ERROR, "Scalable configurations are not allowed in ADTS\n");
66 if (get_bits(&gb, 1)) {
67 av_log_missing_feature(s, "Signaled SBR or PS", 0);
70 if (!adts->channel_conf) {
71 init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE);
73 put_bits(&pb, 3, 5); //ID_PCE
74 adts->pce_size = (ff_copy_pce_data(&pb, &gb) + 3) / 8;
83 static int adts_write_header(AVFormatContext *s)
85 ADTSContext *adts = s->priv_data;
86 AVCodecContext *avc = s->streams[0]->codec;
88 if(avc->extradata_size > 0 &&
89 decode_extradata(s, adts, avc->extradata, avc->extradata_size) < 0)
95 static int adts_write_frame_header(AVFormatContext *s, int size)
97 ADTSContext *ctx = s->priv_data;
99 uint8_t buf[ADTS_HEADER_SIZE];
101 init_put_bits(&pb, buf, ADTS_HEADER_SIZE);
103 /* adts_fixed_header */
104 put_bits(&pb, 12, 0xfff); /* syncword */
105 put_bits(&pb, 1, 0); /* ID */
106 put_bits(&pb, 2, 0); /* layer */
107 put_bits(&pb, 1, 1); /* protection_absent */
108 put_bits(&pb, 2, ctx->objecttype); /* profile_objecttype */
109 put_bits(&pb, 4, ctx->sample_rate_index);
110 put_bits(&pb, 1, 0); /* private_bit */
111 put_bits(&pb, 3, ctx->channel_conf); /* channel_configuration */
112 put_bits(&pb, 1, 0); /* original_copy */
113 put_bits(&pb, 1, 0); /* home */
115 /* adts_variable_header */
116 put_bits(&pb, 1, 0); /* copyright_identification_bit */
117 put_bits(&pb, 1, 0); /* copyright_identification_start */
118 put_bits(&pb, 13, ADTS_HEADER_SIZE + size + ctx->pce_size); /* aac_frame_length */
119 put_bits(&pb, 11, 0x7ff); /* adts_buffer_fullness */
120 put_bits(&pb, 2, 0); /* number_of_raw_data_blocks_in_frame */
123 put_buffer(s->pb, buf, ADTS_HEADER_SIZE);
125 put_buffer(s->pb, ctx->pce_data, ctx->pce_size);
132 static int adts_write_packet(AVFormatContext *s, AVPacket *pkt)
134 ADTSContext *adts = s->priv_data;
135 ByteIOContext *pb = s->pb;
140 adts_write_frame_header(s, pkt->size);
141 put_buffer(pb, pkt->data, pkt->size);
142 put_flush_packet(pb);
147 AVOutputFormat adts_muxer = {
149 NULL_IF_CONFIG_SMALL("ADTS AAC"),