Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavformat / adtsenc.c
... / ...
CommitLineData
1/*
2 * ADTS muxer.
3 * Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
4 * Mans Rullgard <mans@mansr.com>
5 *
6 * This file is part of FFmpeg.
7 *
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.
12 *
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.
17 *
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
21 */
22
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"
28#include "avformat.h"
29#include "apetag.h"
30#include "id3v2.h"
31
32#define ADTS_HEADER_SIZE 7
33
34typedef struct {
35 AVClass *class;
36 int write_adts;
37 int objecttype;
38 int sample_rate_index;
39 int channel_conf;
40 int pce_size;
41 int apetag;
42 int id3v2tag;
43 uint8_t pce_data[MAX_PCE_SIZE];
44} ADTSContext;
45
46#define ADTS_MAX_FRAME_BYTES ((1 << 13) - 1)
47
48static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const uint8_t *buf, int size)
49{
50 GetBitContext gb;
51 PutBitContext pb;
52 MPEG4AudioConfig m4ac;
53 int off;
54
55 init_get_bits(&gb, buf, size * 8);
56 off = avpriv_mpeg4audio_get_config(&m4ac, buf, size * 8, 1);
57 if (off < 0)
58 return off;
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;
63
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;
67 }
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;
71 }
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;
75 }
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;
79 }
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;
83 }
84 if (!adts->channel_conf) {
85 init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE);
86
87 put_bits(&pb, 3, 5); //ID_PCE
88 adts->pce_size = (avpriv_copy_pce_data(&pb, &gb) + 3) / 8;
89 flush_put_bits(&pb);
90 }
91
92 adts->write_adts = 1;
93
94 return 0;
95}
96
97static int adts_write_header(AVFormatContext *s)
98{
99 ADTSContext *adts = s->priv_data;
100 AVCodecContext *avc = s->streams[0]->codec;
101
102 if (adts->id3v2tag)
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);
107
108 return 0;
109}
110
111static int adts_write_frame_header(ADTSContext *ctx,
112 uint8_t *buf, int size, int pce_size)
113{
114 PutBitContext pb;
115
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;
121 }
122
123 init_put_bits(&pb, buf, ADTS_HEADER_SIZE);
124
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 */
136
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 */
143
144 flush_put_bits(&pb);
145
146 return 0;
147}
148
149static int adts_write_packet(AVFormatContext *s, AVPacket *pkt)
150{
151 ADTSContext *adts = s->priv_data;
152 AVIOContext *pb = s->pb;
153 uint8_t buf[ADTS_HEADER_SIZE];
154
155 if (!pkt->size)
156 return 0;
157 if (adts->write_adts) {
158 int err = adts_write_frame_header(adts, buf, pkt->size,
159 adts->pce_size);
160 if (err < 0)
161 return err;
162 avio_write(pb, buf, ADTS_HEADER_SIZE);
163 if (adts->pce_size) {
164 avio_write(pb, adts->pce_data, adts->pce_size);
165 adts->pce_size = 0;
166 }
167 }
168 avio_write(pb, pkt->data, pkt->size);
169
170 return 0;
171}
172
173static int adts_write_trailer(AVFormatContext *s)
174{
175 ADTSContext *adts = s->priv_data;
176
177 if (adts->apetag)
178 ff_ape_write_tag(s);
179
180 return 0;
181}
182
183#define ENC AV_OPT_FLAG_ENCODING_PARAM
184#define OFFSET(obj) offsetof(ADTSContext, obj)
185static 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},
188 { NULL },
189};
190
191static const AVClass adts_muxer_class = {
192 .class_name = "ADTS muxer",
193 .item_name = av_default_item_name,
194 .option = options,
195 .version = LIBAVUTIL_VERSION_INT,
196};
197
198AVOutputFormat ff_adts_muxer = {
199 .name = "adts",
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,
211};