FFmpeg
genh.c
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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/channel_layout.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavcodec/internal.h"
25 #include "avformat.h"
26 #include "internal.h"
27 
28 typedef struct GENHDemuxContext {
29  unsigned dsp_int_type;
30  unsigned interleave_size;
31 } GENHDemuxContext;
32 
33 static int genh_probe(const AVProbeData *p)
34 {
35  if (AV_RL32(p->buf) != MKTAG('G','E','N','H'))
36  return 0;
37  if (AV_RL32(p->buf+4) <= 0 || AV_RL32(p->buf+4) > 0xFFFF) // channels
38  return 0;
39 
40  return AVPROBE_SCORE_MAX / 3 * 2;
41 }
42 
43 static int genh_read_header(AVFormatContext *s)
44 {
45  unsigned start_offset, header_size, codec, coef_type, coef[2];
46  GENHDemuxContext *c = s->priv_data;
47  av_unused unsigned coef_splitted[2];
48  int align, ch, ret;
49  AVStream *st;
50 
51  avio_skip(s->pb, 4);
52 
53  st = avformat_new_stream(s, NULL);
54  if (!st)
55  return AVERROR(ENOMEM);
56 
57  st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
58  st->codecpar->channels = avio_rl32(s->pb);
59  if (st->codecpar->channels <= 0 || st->codecpar->channels > FF_SANE_NB_CHANNELS)
60  return AVERROR_INVALIDDATA;
61  if (st->codecpar->channels == 1)
62  st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
63  else if (st->codecpar->channels == 2)
64  st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
65  align =
66  c->interleave_size = avio_rl32(s->pb);
67  if (align < 0 || align > INT_MAX / st->codecpar->channels)
68  return AVERROR_INVALIDDATA;
69  st->codecpar->block_align = align * st->codecpar->channels;
70  st->codecpar->sample_rate = avio_rl32(s->pb);
71  avio_skip(s->pb, 4);
72  st->duration = avio_rl32(s->pb);
73 
74  codec = avio_rl32(s->pb);
75  switch (codec) {
76  case 0: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; break;
77  case 1:
78  case 11: st->codecpar->bits_per_coded_sample = 4;
79  st->codecpar->block_align = 36 * st->codecpar->channels;
80  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WAV; break;
81  case 2: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_DTK; break;
82  case 3: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
83  AV_CODEC_ID_PCM_S16BE_PLANAR :
84  AV_CODEC_ID_PCM_S16BE; break;
85  case 4: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
86  AV_CODEC_ID_PCM_S16LE_PLANAR :
87  AV_CODEC_ID_PCM_S16LE; break;
88  case 5: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
89  AV_CODEC_ID_PCM_S8_PLANAR :
90  AV_CODEC_ID_PCM_S8; break;
91  case 6: if (st->codecpar->block_align > INT_MAX/1024)
92  return AVERROR_INVALIDDATA;
93  st->codecpar->codec_id = AV_CODEC_ID_SDX2_DPCM; break;
94  case 7: ret = ff_alloc_extradata(st->codecpar, 2);
95  if (ret < 0)
96  return ret;
97  AV_WL16(st->codecpar->extradata, 3);
98  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WS; break;
99  case 10: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA; break;
100  case 12: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_THP; break;
101  case 13: st->codecpar->codec_id = AV_CODEC_ID_PCM_U8; break;
102  case 17: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_QT; break;
103  default:
104  avpriv_request_sample(s, "codec %d", codec);
105  return AVERROR_PATCHWELCOME;
106  }
107 
108  start_offset = avio_rl32(s->pb);
109  header_size = avio_rl32(s->pb);
110 
111  if (header_size > start_offset)
112  return AVERROR_INVALIDDATA;
113 
114  if (header_size == 0)
115  start_offset = 0x800;
116 
117  coef[0] = avio_rl32(s->pb);
118  coef[1] = avio_rl32(s->pb);
119  c->dsp_int_type = avio_rl32(s->pb);
120  coef_type = avio_rl32(s->pb);
121  coef_splitted[0] = avio_rl32(s->pb);
122  coef_splitted[1] = avio_rl32(s->pb);
123 
124  if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_THP) {
125  if (st->codecpar->channels > 2) {
126  avpriv_request_sample(s, "channels %d>2", st->codecpar->channels);
127  return AVERROR_PATCHWELCOME;
128  }
129 
130  ff_alloc_extradata(st->codecpar, 32 * st->codecpar->channels);
131  for (ch = 0; ch < st->codecpar->channels; ch++) {
132  if (coef_type & 1) {
133  avpriv_request_sample(s, "coef_type & 1");
134  return AVERROR_PATCHWELCOME;
135  } else {
136  avio_seek(s->pb, coef[ch], SEEK_SET);
137  avio_read(s->pb, st->codecpar->extradata + 32 * ch, 32);
138  }
139  }
140 
141  if (c->dsp_int_type == 1) {
142  st->codecpar->block_align = 8 * st->codecpar->channels;
143  if (c->interleave_size != 1 &&
144  c->interleave_size != 2 &&
145  c->interleave_size != 4)
146  return AVERROR_INVALIDDATA;
147  }
148  }
149 
150  if (st->codecpar->block_align <= 0)
151  return AVERROR_INVALIDDATA;
152 
153  avio_skip(s->pb, start_offset - avio_tell(s->pb));
154 
155  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
156 
157  return 0;
158 }
159 
160 static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
161 {
162  AVCodecParameters *par = s->streams[0]->codecpar;
163  GENHDemuxContext *c = s->priv_data;
164  int ret;
165 
166  if (c->dsp_int_type == 1 && par->codec_id == AV_CODEC_ID_ADPCM_THP &&
167  par->channels > 1) {
168  int i, ch;
169 
170  if (avio_feof(s->pb))
171  return AVERROR_EOF;
172  ret = av_new_packet(pkt, 8 * par->channels);
173  if (ret < 0)
174  return ret;
175  for (i = 0; i < 8 / c->interleave_size; i++) {
176  for (ch = 0; ch < par->channels; ch++) {
177  pkt->data[ch * 8 + i*c->interleave_size+0] = avio_r8(s->pb);
178  pkt->data[ch * 8 + i*c->interleave_size+1] = avio_r8(s->pb);
179  }
180  }
181  ret = 0;
182  } else if (par->codec_id == AV_CODEC_ID_SDX2_DPCM) {
183  ret = av_get_packet(s->pb, pkt, par->block_align * 1024);
184 
185  } else {
186  ret = av_get_packet(s->pb, pkt, par->block_align ? par->block_align : 1024 * par->channels);
187  }
188 
189  pkt->stream_index = 0;
190  return ret;
191 }
192 
193 const AVInputFormat ff_genh_demuxer = {
194  .name = "genh",
195  .long_name = NULL_IF_CONFIG_SMALL("GENeric Header"),
196  .priv_data_size = sizeof(GENHDemuxContext),
197  .read_probe = genh_probe,
198  .read_header = genh_read_header,
199  .read_packet = genh_read_packet,
200  .extensions = "genh",
201 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:314
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:28
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:768
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:386
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:57
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:29
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:373
AV_CODEC_ID_PCM_S16BE_PLANAR
@ AV_CODEC_ID_PCM_S16BE_PLANAR
Definition: codec_id.h:344
GENHDemuxContext::interleave_size
unsigned interleave_size
Definition: genh.c:30
AV_CODEC_ID_ADPCM_AICA
@ AV_CODEC_ID_ADPCM_AICA
Definition: codec_id.h:391
AV_CODEC_ID_PCM_S16LE_PLANAR
@ AV_CODEC_ID_PCM_S16LE_PLANAR
Definition: codec_id.h:332
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:459
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:315
genh_probe
static int genh_probe(const AVProbeData *p)
Definition: genh.c:33
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:504
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:985
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:318
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:650
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:655
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:449
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVFormatContext
Format I/O context.
Definition: avformat.h:1200
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1095
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:64
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
ff_genh_demuxer
const AVInputFormat ff_genh_demuxer
Definition: genh.c:193
genh_read_packet
static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: genh.c:160
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:447
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:759
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
AV_WL16
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:632
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
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:197
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:935
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:260
avformat.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
genh_read_header
static int genh_read_header(AVFormatContext *s)
Definition: genh.c:43
channel_layout.h
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:641
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, 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:1196
AVPacket::stream_index
int stream_index
Definition: packet.h:375
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:347
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:319
AV_CODEC_ID_SDX2_DPCM
@ AV_CODEC_ID_SDX2_DPCM
Definition: codec_id.h:418
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:37
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_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:341
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
AV_CODEC_ID_ADPCM_PSX
@ AV_CODEC_ID_ADPCM_PSX
Definition: codec_id.h:390
FF_SANE_NB_CHANNELS
#define FF_SANE_NB_CHANNELS
Definition: internal.h:101
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:451
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:375
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