FFmpeg
genh.c
Go to the documentation of this file.
1 /*
2  * GENH demuxer
3  * Copyright (c) 2015 Paul B Mahol
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/intreadwrite.h"
23 #include "libavcodec/internal.h"
24 #include "avformat.h"
25 #include "internal.h"
26 
27 typedef struct GENHDemuxContext {
28  unsigned dsp_int_type;
29  unsigned interleave_size;
30 } GENHDemuxContext;
31 
32 static int genh_probe(const AVProbeData *p)
33 {
34  if (AV_RL32(p->buf) != MKTAG('G','E','N','H'))
35  return 0;
36  if (AV_RL32(p->buf+4) <= 0 || AV_RL32(p->buf+4) > 0xFFFF) // channels
37  return 0;
38 
39  return AVPROBE_SCORE_MAX / 3 * 2;
40 }
41 
42 static int genh_read_header(AVFormatContext *s)
43 {
44  unsigned start_offset, header_size, codec, coef_type, coef[2];
45  GENHDemuxContext *c = s->priv_data;
46  av_unused unsigned coef_splitted[2];
47  int align, ch, ret;
48  AVStream *st;
49 
50  avio_skip(s->pb, 4);
51 
52  st = avformat_new_stream(s, NULL);
53  if (!st)
54  return AVERROR(ENOMEM);
55 
56  st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
57  st->codecpar->channels = avio_rl32(s->pb);
58  if (st->codecpar->channels <= 0 || st->codecpar->channels > FF_SANE_NB_CHANNELS)
59  return AVERROR_INVALIDDATA;
60  if (st->codecpar->channels == 1)
61  st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
62  else if (st->codecpar->channels == 2)
63  st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
64  align =
65  c->interleave_size = avio_rl32(s->pb);
66  if (align < 0 || align > INT_MAX / st->codecpar->channels)
67  return AVERROR_INVALIDDATA;
68  st->codecpar->block_align = align * st->codecpar->channels;
69  st->codecpar->sample_rate = avio_rl32(s->pb);
70  avio_skip(s->pb, 4);
71  st->duration = avio_rl32(s->pb);
72 
73  codec = avio_rl32(s->pb);
74  switch (codec) {
75  case 0: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; break;
76  case 1:
77  case 11: st->codecpar->bits_per_coded_sample = 4;
78  st->codecpar->block_align = 36 * st->codecpar->channels;
79  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WAV; break;
80  case 2: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_DTK; break;
81  case 3: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
82  AV_CODEC_ID_PCM_S16BE_PLANAR :
83  AV_CODEC_ID_PCM_S16BE; break;
84  case 4: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
85  AV_CODEC_ID_PCM_S16LE_PLANAR :
86  AV_CODEC_ID_PCM_S16LE; break;
87  case 5: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
88  AV_CODEC_ID_PCM_S8_PLANAR :
89  AV_CODEC_ID_PCM_S8; break;
90  case 6: if (st->codecpar->block_align > INT_MAX/1024)
91  return AVERROR_INVALIDDATA;
92  st->codecpar->codec_id = AV_CODEC_ID_SDX2_DPCM; break;
93  case 7: ret = ff_alloc_extradata(st->codecpar, 2);
94  if (ret < 0)
95  return ret;
96  AV_WL16(st->codecpar->extradata, 3);
97  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WS; break;
98  case 10: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA; break;
99  case 12: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_THP; break;
100  case 13: st->codecpar->codec_id = AV_CODEC_ID_PCM_U8; break;
101  case 17: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_QT; break;
102  default:
103  avpriv_request_sample(s, "codec %d", codec);
104  return AVERROR_PATCHWELCOME;
105  }
106 
107  start_offset = avio_rl32(s->pb);
108  header_size = avio_rl32(s->pb);
109 
110  if (header_size > start_offset)
111  return AVERROR_INVALIDDATA;
112 
113  if (header_size == 0)
114  start_offset = 0x800;
115 
116  coef[0] = avio_rl32(s->pb);
117  coef[1] = avio_rl32(s->pb);
118  c->dsp_int_type = avio_rl32(s->pb);
119  coef_type = avio_rl32(s->pb);
120  coef_splitted[0] = avio_rl32(s->pb);
121  coef_splitted[1] = avio_rl32(s->pb);
122 
123  if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_THP) {
124  if (st->codecpar->channels > 2) {
125  avpriv_request_sample(s, "channels %d>2", st->codecpar->channels);
126  return AVERROR_PATCHWELCOME;
127  }
128 
129  ff_alloc_extradata(st->codecpar, 32 * st->codecpar->channels);
130  for (ch = 0; ch < st->codecpar->channels; ch++) {
131  if (coef_type & 1) {
132  avpriv_request_sample(s, "coef_type & 1");
133  return AVERROR_PATCHWELCOME;
134  } else {
135  avio_seek(s->pb, coef[ch], SEEK_SET);
136  avio_read(s->pb, st->codecpar->extradata + 32 * ch, 32);
137  }
138  }
139 
140  if (c->dsp_int_type == 1) {
141  st->codecpar->block_align = 8 * st->codecpar->channels;
142  if (c->interleave_size != 1 &&
143  c->interleave_size != 2 &&
144  c->interleave_size != 4)
145  return AVERROR_INVALIDDATA;
146  }
147  }
148 
149  if (st->codecpar->block_align <= 0)
150  return AVERROR_INVALIDDATA;
151 
152  avio_skip(s->pb, start_offset - avio_tell(s->pb));
153 
154  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
155 
156  return 0;
157 }
158 
159 static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
160 {
161  AVCodecParameters *par = s->streams[0]->codecpar;
162  GENHDemuxContext *c = s->priv_data;
163  int ret;
164 
165  if (c->dsp_int_type == 1 && par->codec_id == AV_CODEC_ID_ADPCM_THP &&
166  par->channels > 1) {
167  int i, ch;
168 
169  if (avio_feof(s->pb))
170  return AVERROR_EOF;
171  ret = av_new_packet(pkt, 8 * par->channels);
172  if (ret < 0)
173  return ret;
174  for (i = 0; i < 8 / c->interleave_size; i++) {
175  for (ch = 0; ch < par->channels; ch++) {
176  pkt->data[ch * 8 + i*c->interleave_size+0] = avio_r8(s->pb);
177  pkt->data[ch * 8 + i*c->interleave_size+1] = avio_r8(s->pb);
178  }
179  }
180  ret = 0;
181  } else if (par->codec_id == AV_CODEC_ID_SDX2_DPCM) {
182  ret = av_get_packet(s->pb, pkt, par->block_align * 1024);
183 
184  } else {
185  ret = av_get_packet(s->pb, pkt, par->block_align ? par->block_align : 1024 * par->channels);
186  }
187 
188  pkt->stream_index = 0;
189  return ret;
190 }
191 
192 AVInputFormat ff_genh_demuxer = {
193  .name = "genh",
194  .long_name = NULL_IF_CONFIG_SMALL("GENeric Header"),
195  .priv_data_size = sizeof(GENHDemuxContext),
196  .read_probe = genh_probe,
197  .read_header = genh_read_header,
198  .read_packet = genh_read_packet,
199  .extensions = "genh",
200 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:313
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
AV_CODEC_ID_ADPCM_IMA_QT
@ AV_CODEC_ID_ADPCM_IMA_QT
Definition: codec_id.h:353
GENHDemuxContext
Definition: genh.c:27
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AV_CODEC_ID_ADPCM_DTK
@ AV_CODEC_ID_ADPCM_DTK
Definition: codec_id.h:387
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
MKTAG
#define MKTAG(a, b, c, d)
Definition: common.h:478
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:90
av_unused
#define av_unused
Definition: attributes.h:131
GENHDemuxContext::dsp_int_type
unsigned dsp_int_type
Definition: genh.c:28
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:369
AV_CODEC_ID_PCM_S16BE_PLANAR
@ AV_CODEC_ID_PCM_S16BE_PLANAR
Definition: codec_id.h:343
GENHDemuxContext::interleave_size
unsigned interleave_size
Definition: genh.c:29
AV_CODEC_ID_ADPCM_AICA
@ AV_CODEC_ID_ADPCM_AICA
Definition: codec_id.h:392
AV_CODEC_ID_PCM_S16LE_PLANAR
@ AV_CODEC_ID_PCM_S16LE_PLANAR
Definition: codec_id.h:331
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
AV_CODEC_ID_PCM_S16BE
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:314
genh_probe
static int genh_probe(const AVProbeData *p)
Definition: genh.c:32
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:91
AV_CODEC_ID_PCM_S8
@ AV_CODEC_ID_PCM_S8
Definition: codec_id.h:317
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:640
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVFormatContext
Format I/O context.
Definition: avformat.h:1232
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AV_CODEC_ID_ADPCM_IMA_WS
@ AV_CODEC_ID_ADPCM_IMA_WS
Definition: codec_id.h:357
genh_read_packet
static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: genh.c:159
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
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:117
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4945
AV_WL16
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
i
int i
Definition: input.c:407
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:177
av_get_packet
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:873
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
avformat.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
ff_genh_demuxer
AVInputFormat ff_genh_demuxer
Definition: genh.c:192
genh_read_header
static int genh_read_header(AVFormatContext *s)
Definition: genh.c:42
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
AVPacket::stream_index
int stream_index
Definition: packet.h:371
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
AV_CODEC_ID_ADPCM_THP
@ AV_CODEC_ID_ADPCM_THP
Definition: codec_id.h:371
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
AV_CODEC_ID_PCM_U8
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:318
AV_CODEC_ID_SDX2_DPCM
@ AV_CODEC_ID_SDX2_DPCM
Definition: codec_id.h:419
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
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:346
AV_CODEC_ID_ADPCM_IMA_WAV
@ AV_CODEC_ID_ADPCM_IMA_WAV
Definition: codec_id.h:354
AVCodecParameters::channel_layout
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
AV_CODEC_ID_PCM_S8_PLANAR
@ AV_CODEC_ID_PCM_S8_PLANAR
Definition: codec_id.h:340
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AV_CODEC_ID_ADPCM_PSX
@ AV_CODEC_ID_ADPCM_PSX
Definition: codec_id.h:391
FF_SANE_NB_CHANNELS
#define FF_SANE_NB_CHANNELS
Definition: internal.h:107
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:3314
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
Generated on Wed Aug 24 2022 21:34:41 for FFmpeg by   doxygen 1.8.17