FFmpeg
adtsenc.c
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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/codec_id.h"
26 #include "libavcodec/codec_par.h"
27 #include "libavcodec/packet.h"
28 #include "libavcodec/mpeg4audio.h"
29 #include "libavutil/opt.h"
30 #include "avformat.h"
31 #include "apetag.h"
32 #include "id3v2.h"
33 
34 #define ADTS_HEADER_SIZE 7
35 
36 typedef struct ADTSContext {
37  AVClass *class;
42  int pce_size;
43  int apetag;
44  int id3v2tag;
45  int mpeg_id;
47 } ADTSContext;
48 
49 #define ADTS_MAX_FRAME_BYTES ((1 << 14) - 1)
50 
51 static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const uint8_t *buf, int size)
52 {
53  GetBitContext gb;
54  PutBitContext pb;
55  MPEG4AudioConfig m4ac;
56  int off;
57 
58  init_get_bits(&gb, buf, size * 8);
59  off = avpriv_mpeg4audio_get_config2(&m4ac, buf, size, 1, s);
60  if (off < 0)
61  return off;
62  skip_bits_long(&gb, off);
63  adts->objecttype = m4ac.object_type - 1;
64  adts->sample_rate_index = m4ac.sampling_index;
65  adts->channel_conf = m4ac.chan_config;
66 
67  if (adts->objecttype > 3U) {
68  av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1);
69  return AVERROR_INVALIDDATA;
70  }
71  if (adts->sample_rate_index == 15) {
72  av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n");
73  return AVERROR_INVALIDDATA;
74  }
75  if (get_bits(&gb, 1)) {
76  av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n");
77  return AVERROR_INVALIDDATA;
78  }
79  if (get_bits(&gb, 1)) {
80  av_log(s, AV_LOG_ERROR, "Scalable configurations are not allowed in ADTS\n");
81  return AVERROR_INVALIDDATA;
82  }
83  if (get_bits(&gb, 1)) {
84  av_log(s, AV_LOG_ERROR, "Extension flag is not allowed in ADTS\n");
85  return AVERROR_INVALIDDATA;
86  }
87  if (!adts->channel_conf) {
88  init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE);
89 
90  put_bits(&pb, 3, 5); //ID_PCE
91  adts->pce_size = (ff_copy_pce_data(&pb, &gb) + 3) / 8;
92  flush_put_bits(&pb);
93  }
94 
95  adts->write_adts = 1;
96 
97  return 0;
98 }
99 
101 {
102  ADTSContext *adts = s->priv_data;
103  AVCodecParameters *par = s->streams[0]->codecpar;
104 
105  if (par->codec_id != AV_CODEC_ID_AAC) {
106  av_log(s, AV_LOG_ERROR, "Only AAC streams can be muxed by the ADTS muxer\n");
107  return AVERROR(EINVAL);
108  }
109  if (par->extradata_size > 0)
110  return adts_decode_extradata(s, adts, par->extradata,
111  par->extradata_size);
112 
113  return 0;
114 }
115 
117 {
118  ADTSContext *adts = s->priv_data;
119 
120  if (adts->id3v2tag)
122 
123  return 0;
124 }
125 
127  uint8_t *buf, int size, int pce_size)
128 {
129  PutBitContext pb;
130 
131  unsigned full_frame_size = (unsigned)ADTS_HEADER_SIZE + size + pce_size;
132  if (full_frame_size > ADTS_MAX_FRAME_BYTES) {
133  av_log(NULL, AV_LOG_ERROR, "ADTS frame size too large: %u (max %d)\n",
134  full_frame_size, ADTS_MAX_FRAME_BYTES);
135  return AVERROR_INVALIDDATA;
136  }
137 
138  init_put_bits(&pb, buf, ADTS_HEADER_SIZE);
139 
140  /* adts_fixed_header */
141  put_bits(&pb, 12, 0xfff); /* syncword */
142  put_bits(&pb, 1, ctx->mpeg_id); /* ID */
143  put_bits(&pb, 2, 0); /* layer */
144  put_bits(&pb, 1, 1); /* protection_absent */
145  put_bits(&pb, 2, ctx->objecttype); /* profile_objecttype */
146  put_bits(&pb, 4, ctx->sample_rate_index);
147  put_bits(&pb, 1, 0); /* private_bit */
148  put_bits(&pb, 3, ctx->channel_conf); /* channel_configuration */
149  put_bits(&pb, 1, 0); /* original_copy */
150  put_bits(&pb, 1, 0); /* home */
151 
152  /* adts_variable_header */
153  put_bits(&pb, 1, 0); /* copyright_identification_bit */
154  put_bits(&pb, 1, 0); /* copyright_identification_start */
155  put_bits(&pb, 13, full_frame_size); /* aac_frame_length */
156  put_bits(&pb, 11, 0x7ff); /* adts_buffer_fullness */
157  put_bits(&pb, 2, 0); /* number_of_raw_data_blocks_in_frame */
158 
159  flush_put_bits(&pb);
160 
161  return 0;
162 }
163 
165 {
166  ADTSContext *adts = s->priv_data;
167  AVCodecParameters *par = s->streams[0]->codecpar;
168  AVIOContext *pb = s->pb;
169  uint8_t buf[ADTS_HEADER_SIZE];
170 
171  if (!pkt->size)
172  return 0;
173  if (!par->extradata_size) {
174  uint8_t *side_data;
175  size_t side_data_size;
176  int ret;
177 
179  &side_data_size);
180  if (side_data_size) {
181  ret = adts_decode_extradata(s, adts, side_data, side_data_size);
182  if (ret < 0)
183  return ret;
184  ret = ff_alloc_extradata(par, side_data_size);
185  if (ret < 0)
186  return ret;
187  memcpy(par->extradata, side_data, side_data_size);
188  }
189  }
190  if (adts->write_adts) {
191  int err = adts_write_frame_header(adts, buf, pkt->size,
192  adts->pce_size);
193  if (err < 0)
194  return err;
195  avio_write(pb, buf, ADTS_HEADER_SIZE);
196  if (adts->pce_size) {
197  avio_write(pb, adts->pce_data, adts->pce_size);
198  adts->pce_size = 0;
199  }
200  }
201  avio_write(pb, pkt->data, pkt->size);
202 
203  return 0;
204 }
205 
207 {
208  ADTSContext *adts = s->priv_data;
209 
210  if (adts->apetag)
212 
213  return 0;
214 }
215 
216 #define ENC AV_OPT_FLAG_ENCODING_PARAM
217 #define OFFSET(obj) offsetof(ADTSContext, obj)
218 static const AVOption options[] = {
219  { "write_id3v2", "Enable ID3v2 tag writing", OFFSET(id3v2tag), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC},
220  { "write_apetag", "Enable APE tag writing", OFFSET(apetag), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC},
221  { "write_mpeg2", "Set MPEG version to MPEG-2", OFFSET(mpeg_id), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC},
222  { NULL },
223 };
224 
225 static const AVClass adts_muxer_class = {
226  .class_name = "ADTS muxer",
227  .item_name = av_default_item_name,
228  .option = options,
229  .version = LIBAVUTIL_VERSION_INT,
230 };
231 
233  .name = "adts",
234  .long_name = NULL_IF_CONFIG_SMALL("ADTS AAC (Advanced Audio Coding)"),
235  .mime_type = "audio/aac",
236  .extensions = "aac,adts",
237  .priv_data_size = sizeof(ADTSContext),
238  .audio_codec = AV_CODEC_ID_AAC,
239  .video_codec = AV_CODEC_ID_NONE,
240  .init = adts_init,
244  .priv_class = &adts_muxer_class,
246 };
skip_bits_long
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:292
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
adts_write_trailer
static int adts_write_trailer(AVFormatContext *s)
Definition: adtsenc.c:206
AVOutputFormat::name
const char * name
Definition: avformat.h:496
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
adts_init
static int adts_init(AVFormatContext *s)
Definition: adtsenc.c:100
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
ADTSContext::apetag
int apetag
Definition: adtsenc.c:43
AVFMT_NOTIMESTAMPS
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:467
adts_decode_extradata
static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const uint8_t *buf, int size)
Definition: adtsenc.c:51
init_put_bits
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:61
id3v2.h
apetag.h
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:220
AVPacket::data
uint8_t * data
Definition: packet.h:373
AVOption
AVOption.
Definition: opt.h:247
MAX_PCE_SIZE
#define MAX_PCE_SIZE
Maximum size of a PCE including the 3-bit ID_PCE.
Definition: mpeg4audio.h:121
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:660
options
static const AVOption options[]
Definition: adtsenc.c:218
ADTS_MAX_FRAME_BYTES
#define ADTS_MAX_FRAME_BYTES
Definition: adtsenc.c:49
MPEG4AudioConfig
Definition: mpeg4audio.h:33
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:380
mpeg4audio.h
U
#define U(x)
Definition: vp56_arith.h:37
ADTS_HEADER_SIZE
#define ADTS_HEADER_SIZE
Definition: adtsenc.c:34
adts_write_packet
static int adts_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: adtsenc.c:164
GetBitContext
Definition: get_bits.h:62
adts_write_header
static int adts_write_header(AVFormatContext *s)
Definition: adtsenc.c:116
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
codec_id.h
avpriv_mpeg4audio_get_config2
int avpriv_mpeg4audio_get_config2(MPEG4AudioConfig *c, const uint8_t *buf, int size, int sync_extension, void *logctx)
Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration.
Definition: mpeg4audio.c:172
s
#define s(width, name)
Definition: cbs_vp9.c:257
ADTSContext::id3v2tag
int id3v2tag
Definition: adtsenc.c:44
ctx
AVFormatContext * ctx
Definition: movenc.c:48
get_bits.h
PutBitContext
Definition: put_bits.h:49
ADTSContext::pce_size
int pce_size
Definition: adtsenc.c:42
ff_ape_write_tag
int ff_ape_write_tag(AVFormatContext *s)
Write an APE tag into a file.
Definition: apetag.c:175
ADTSContext::objecttype
int objecttype
Definition: adtsenc.c:39
AVFormatContext
Format I/O context.
Definition: avformat.h:1107
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
write_trailer
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:98
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
MPEG4AudioConfig::sampling_index
int sampling_index
Definition: mpeg4audio.h:35
ff_copy_pce_data
static int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)
Definition: mpeg4audio.h:133
ENC
#define ENC
Definition: adtsenc.c:216
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
AV_CODEC_ID_AAC
@ AV_CODEC_ID_AAC
Definition: codec_id.h:424
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
AVPacket::size
int size
Definition: packet.h:374
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:116
ADTSContext::write_adts
int write_adts
Definition: adtsenc.c:38
size
int size
Definition: twinvq_data.h:10344
ID3v2_DEFAULT_MAGIC
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: "ID3".
Definition: id3v2.h:35
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:215
write_packet
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:729
ADTSContext::channel_conf
int channel_conf
Definition: adtsenc.c:41
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
AVOutputFormat
Definition: avformat.h:495
packet.h
av_packet_get_side_data
uint8_t * av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type, size_t *size)
Get side information from packet.
Definition: avpacket.c:246
ADTSContext::sample_rate_index
int sample_rate_index
Definition: adtsenc.c:40
MPEG4AudioConfig::chan_config
int chan_config
Definition: mpeg4audio.h:37
adts_muxer_class
static const AVClass adts_muxer_class
Definition: adtsenc.c:225
ff_adts_muxer
const AVOutputFormat ff_adts_muxer
Definition: adtsenc.c:232
ret
ret
Definition: filter_design.txt:187
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:71
avformat.h
MPEG4AudioConfig::object_type
int object_type
Definition: mpeg4audio.h:34
AV_PKT_DATA_NEW_EXTRADATA
@ AV_PKT_DATA_NEW_EXTRADATA
The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format that the extradata buffer was...
Definition: packet.h:55
ADTSContext::pce_data
uint8_t pce_data[MAX_PCE_SIZE]
Definition: adtsenc.c:46
adts_write_frame_header
static int adts_write_frame_header(ADTSContext *ctx, uint8_t *buf, int size, int pce_size)
Definition: adtsenc.c:126
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:142
codec_par.h
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:241
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
write_header
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:347
put_bits.h
OFFSET
#define OFFSET(obj)
Definition: adtsenc.c:217
ff_id3v2_write_simple
int ff_id3v2_write_simple(struct AVFormatContext *s, int id3v2_version, const char *magic)
Write an ID3v2 tag containing all global metadata from s.
Definition: id3v2enc.c:444
ADTSContext::mpeg_id
int mpeg_id
Definition: adtsenc.c:45
ADTSContext
Definition: adtsenc.c:36
ff_alloc_extradata
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0.
Definition: utils.c:3265