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/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 
34 typedef struct ADTSContext {
35  AVClass *class;
40  int pce_size;
41  int apetag;
42  int id3v2tag;
44 } ADTSContext;
45 
46 #define ADTS_MAX_FRAME_BYTES ((1 << 13) - 1)
47 
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 = (ff_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 
98 {
99  ADTSContext *adts = s->priv_data;
100  AVCodecParameters *par = s->streams[0]->codecpar;
101 
102  if (par->codec_id != AV_CODEC_ID_AAC) {
103  av_log(s, AV_LOG_ERROR, "Only AAC streams can be muxed by the ADTS muxer\n");
104  return AVERROR(EINVAL);
105  }
106  if (par->extradata_size > 0)
107  return adts_decode_extradata(s, adts, par->extradata,
108  par->extradata_size);
109 
110  return 0;
111 }
112 
114 {
115  ADTSContext *adts = s->priv_data;
116 
117  if (adts->id3v2tag)
119 
120  return 0;
121 }
122 
124  uint8_t *buf, int size, int pce_size)
125 {
126  PutBitContext pb;
127 
128  unsigned full_frame_size = (unsigned)ADTS_HEADER_SIZE + size + pce_size;
129  if (full_frame_size > ADTS_MAX_FRAME_BYTES) {
130  av_log(NULL, AV_LOG_ERROR, "ADTS frame size too large: %u (max %d)\n",
131  full_frame_size, ADTS_MAX_FRAME_BYTES);
132  return AVERROR_INVALIDDATA;
133  }
134 
135  init_put_bits(&pb, buf, ADTS_HEADER_SIZE);
136 
137  /* adts_fixed_header */
138  put_bits(&pb, 12, 0xfff); /* syncword */
139  put_bits(&pb, 1, 0); /* ID */
140  put_bits(&pb, 2, 0); /* layer */
141  put_bits(&pb, 1, 1); /* protection_absent */
142  put_bits(&pb, 2, ctx->objecttype); /* profile_objecttype */
143  put_bits(&pb, 4, ctx->sample_rate_index);
144  put_bits(&pb, 1, 0); /* private_bit */
145  put_bits(&pb, 3, ctx->channel_conf); /* channel_configuration */
146  put_bits(&pb, 1, 0); /* original_copy */
147  put_bits(&pb, 1, 0); /* home */
148 
149  /* adts_variable_header */
150  put_bits(&pb, 1, 0); /* copyright_identification_bit */
151  put_bits(&pb, 1, 0); /* copyright_identification_start */
152  put_bits(&pb, 13, full_frame_size); /* aac_frame_length */
153  put_bits(&pb, 11, 0x7ff); /* adts_buffer_fullness */
154  put_bits(&pb, 2, 0); /* number_of_raw_data_blocks_in_frame */
155 
156  flush_put_bits(&pb);
157 
158  return 0;
159 }
160 
162 {
163  ADTSContext *adts = s->priv_data;
164  AVCodecParameters *par = s->streams[0]->codecpar;
165  AVIOContext *pb = s->pb;
167 
168  if (!pkt->size)
169  return 0;
170  if (!par->extradata_size) {
171  uint8_t *side_data;
172  int side_data_size = 0, ret;
173 
175  &side_data_size);
176  if (side_data_size) {
177  ret = adts_decode_extradata(s, adts, side_data, side_data_size);
178  if (ret < 0)
179  return ret;
180  ret = ff_alloc_extradata(par, side_data_size);
181  if (ret < 0)
182  return ret;
183  memcpy(par->extradata, side_data, side_data_size);
184  }
185  }
186  if (adts->write_adts) {
187  int err = adts_write_frame_header(adts, buf, pkt->size,
188  adts->pce_size);
189  if (err < 0)
190  return err;
191  avio_write(pb, buf, ADTS_HEADER_SIZE);
192  if (adts->pce_size) {
193  avio_write(pb, adts->pce_data, adts->pce_size);
194  adts->pce_size = 0;
195  }
196  }
197  avio_write(pb, pkt->data, pkt->size);
198 
199  return 0;
200 }
201 
203 {
204  ADTSContext *adts = s->priv_data;
205 
206  if (adts->apetag)
207  ff_ape_write_tag(s);
208 
209  return 0;
210 }
211 
212 #define ENC AV_OPT_FLAG_ENCODING_PARAM
213 #define OFFSET(obj) offsetof(ADTSContext, obj)
214 static const AVOption options[] = {
215  { "write_id3v2", "Enable ID3v2 tag writing", OFFSET(id3v2tag), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC},
216  { "write_apetag", "Enable APE tag writing", OFFSET(apetag), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC},
217  { NULL },
218 };
219 
220 static const AVClass adts_muxer_class = {
221  .class_name = "ADTS muxer",
222  .item_name = av_default_item_name,
223  .option = options,
224  .version = LIBAVUTIL_VERSION_INT,
225 };
226 
228  .name = "adts",
229  .long_name = NULL_IF_CONFIG_SMALL("ADTS AAC (Advanced Audio Coding)"),
230  .mime_type = "audio/aac",
231  .extensions = "aac,adts",
232  .priv_data_size = sizeof(ADTSContext),
233  .audio_codec = AV_CODEC_ID_AAC,
234  .video_codec = AV_CODEC_ID_NONE,
235  .init = adts_init,
239  .priv_class = &adts_muxer_class,
241 };
uint8_t pce_data[MAX_PCE_SIZE]
Definition: adtsenc.c:43
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:689
#define NULL
Definition: coverity.c:32
int id3v2tag
Definition: adtsenc.c:42
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AVOption.
Definition: opt.h:246
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:449
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:208
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static void skip_bits_long(GetBitContext *s, int n)
Skips the specified number of bits.
Definition: get_bits.h:291
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static int adts_init(AVFormatContext *s)
Definition: adtsenc.c:97
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3957
int size
Definition: avcodec.h:1478
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: "ID3".
Definition: id3v2.h:35
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const uint8_t *buf, int size)
Definition: adtsenc.c:48
int objecttype
Definition: adtsenc.c:37
#define ADTS_MAX_FRAME_BYTES
Definition: adtsenc.c:46
static AVPacket pkt
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3949
static int adts_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: adtsenc.c:161
Format I/O context.
Definition: avformat.h:1358
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:72
uint8_t
static const AVOption options[]
Definition: adtsenc.c:214
AVOptions.
static int adts_write_header(AVFormatContext *s)
Definition: adtsenc.c:113
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
uint8_t * data
Definition: avcodec.h:1477
#define ADTS_HEADER_SIZE
Definition: adtsenc.c:32
bitstream reader API header.
ptrdiff_t size
Definition: opengl_enc.c:100
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
#define av_log(a,...)
#define U(x)
Definition: vp56_arith.h:37
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
uint8_t * av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type, int *size)
Get side information from packet.
Definition: avpacket.c:350
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
int channel_conf
Definition: adtsenc.c:39
int write_adts
Definition: adtsenc.c:36
int sample_rate_index
Definition: adtsenc.c:38
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3975
#define ENC
Definition: adtsenc.c:212
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:3294
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
const char * name
Definition: avformat.h:505
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
int pce_size
Definition: adtsenc.c:40
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:467
The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format that the extradata buffer was...
Definition: avcodec.h:1199
Libavcodec external API header.
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
void * buf
Definition: avisynth_c.h:766
int ff_ape_write_tag(AVFormatContext *s)
Write an APE tag into a file.
Definition: apetag.c:185
Describe the class of an AVClass context structure.
Definition: log.h:67
static int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)
Definition: mpeg4audio.h:131
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
int apetag
Definition: adtsenc.c:41
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static const AVClass adts_muxer_class
Definition: adtsenc.c:220
Main libavformat public API header.
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:101
static int adts_write_frame_header(ADTSContext *ctx, uint8_t *buf, int size, int pce_size)
Definition: adtsenc.c:123
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:48
#define MAX_PCE_SIZE
Maximum size of a PCE including the 3-bit ID_PCE.
Definition: mpeg4audio.h:119
int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int bit_size, int sync_extension)
Parse MPEG-4 systems extradata from a raw buffer to retrieve audio configuration. ...
Definition: mpeg4audio.c:155
void * priv_data
Format private data.
Definition: avformat.h:1386
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:337
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3971
#define OFFSET(obj)
Definition: adtsenc.c:213
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
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
This structure stores compressed data.
Definition: avcodec.h:1454
AVOutputFormat ff_adts_muxer
Definition: adtsenc.c:227
static int adts_write_trailer(AVFormatContext *s)
Definition: adtsenc.c:202
bitstream writer API