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 "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->ch_layout.nb_channels = avio_rl32(s->pb);
58  if (st->codecpar->ch_layout.nb_channels <= 0)
59  return AVERROR_INVALIDDATA;
60  if (st->codecpar->ch_layout.nb_channels == 1)
61  st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
62  else if (st->codecpar->ch_layout.nb_channels == 2)
63  st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
64  align =
65  c->interleave_size = avio_rl32(s->pb);
66  if (align < 0 || align > INT_MAX / st->codecpar->ch_layout.nb_channels)
67  return AVERROR_INVALIDDATA;
68  st->codecpar->block_align = align * st->codecpar->ch_layout.nb_channels;
69  st->codecpar->sample_rate = avio_rl32(s->pb);
70  if (st->codecpar->sample_rate < 0)
71  return AVERROR_INVALIDDATA;
72 
73  avio_skip(s->pb, 4);
74  st->duration = avio_rl32(s->pb);
75 
76  codec = avio_rl32(s->pb);
77  switch (codec) {
78  case 0: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; break;
79  case 1:
80  case 11: st->codecpar->bits_per_coded_sample = 4;
81  if (st->codecpar->ch_layout.nb_channels > INT_MAX / 36)
82  return AVERROR_INVALIDDATA;
83  st->codecpar->block_align = 36 * st->codecpar->ch_layout.nb_channels;
84  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WAV; break;
85  case 2: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_DTK; break;
86  case 3: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
87  AV_CODEC_ID_PCM_S16BE_PLANAR :
88  AV_CODEC_ID_PCM_S16BE; break;
89  case 4: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
90  AV_CODEC_ID_PCM_S16LE_PLANAR :
91  AV_CODEC_ID_PCM_S16LE; break;
92  case 5: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
93  AV_CODEC_ID_PCM_S8_PLANAR :
94  AV_CODEC_ID_PCM_S8; break;
95  case 6: if (st->codecpar->block_align > INT_MAX/1024)
96  return AVERROR_INVALIDDATA;
97  st->codecpar->codec_id = AV_CODEC_ID_SDX2_DPCM; break;
98  case 7: ret = ff_alloc_extradata(st->codecpar, 2);
99  if (ret < 0)
100  return ret;
101  AV_WL16(st->codecpar->extradata, 3);
102  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WS; break;
103  case 10: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA; break;
104  case 12: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_THP; break;
105  case 13: st->codecpar->codec_id = AV_CODEC_ID_PCM_U8; break;
106  case 17: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_QT; break;
107  default:
108  avpriv_request_sample(s, "codec %d", codec);
109  return AVERROR_PATCHWELCOME;
110  }
111 
112  start_offset = avio_rl32(s->pb);
113  header_size = avio_rl32(s->pb);
114 
115  if (header_size > start_offset)
116  return AVERROR_INVALIDDATA;
117 
118  if (header_size == 0)
119  start_offset = 0x800;
120 
121  coef[0] = avio_rl32(s->pb);
122  coef[1] = avio_rl32(s->pb);
123  c->dsp_int_type = avio_rl32(s->pb);
124  coef_type = avio_rl32(s->pb);
125  coef_splitted[0] = avio_rl32(s->pb);
126  coef_splitted[1] = avio_rl32(s->pb);
127 
128  if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_THP) {
129  if (st->codecpar->ch_layout.nb_channels > 2) {
130  avpriv_request_sample(s, "channels %d>2", st->codecpar->ch_layout.nb_channels);
131  return AVERROR_PATCHWELCOME;
132  }
133 
134  ff_alloc_extradata(st->codecpar, 32 * st->codecpar->ch_layout.nb_channels);
135  for (ch = 0; ch < st->codecpar->ch_layout.nb_channels; ch++) {
136  if (coef_type & 1) {
137  avpriv_request_sample(s, "coef_type & 1");
138  return AVERROR_PATCHWELCOME;
139  } else {
140  avio_seek(s->pb, coef[ch], SEEK_SET);
141  avio_read(s->pb, st->codecpar->extradata + 32 * ch, 32);
142  }
143  }
144 
145  if (c->dsp_int_type == 1) {
146  st->codecpar->block_align = 8 * st->codecpar->ch_layout.nb_channels;
147  if (c->interleave_size != 1 &&
148  c->interleave_size != 2 &&
149  c->interleave_size != 4)
150  return AVERROR_INVALIDDATA;
151  }
152  }
153 
154  if (st->codecpar->block_align <= 0)
155  return AVERROR_INVALIDDATA;
156 
157  avio_skip(s->pb, start_offset - avio_tell(s->pb));
158 
159  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
160 
161  return 0;
162 }
163 
164 static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
165 {
166  AVCodecParameters *par = s->streams[0]->codecpar;
167  GENHDemuxContext *c = s->priv_data;
168  int ret;
169 
170  if (c->dsp_int_type == 1 && par->codec_id == AV_CODEC_ID_ADPCM_THP &&
171  par->ch_layout.nb_channels > 1) {
172  int i, ch;
173 
174  if (avio_feof(s->pb))
175  return AVERROR_EOF;
176  ret = av_new_packet(pkt, 8 * par->ch_layout.nb_channels);
177  if (ret < 0)
178  return ret;
179  for (i = 0; i < 8 / c->interleave_size; i++) {
180  for (ch = 0; ch < par->ch_layout.nb_channels; ch++) {
181  pkt->data[ch * 8 + i*c->interleave_size+0] = avio_r8(s->pb);
182  pkt->data[ch * 8 + i*c->interleave_size+1] = avio_r8(s->pb);
183  }
184  }
185  ret = 0;
186  } else if (par->codec_id == AV_CODEC_ID_SDX2_DPCM) {
187  ret = av_get_packet(s->pb, pkt, par->block_align * 1024);
188 
189  } else {
190  ret = av_get_packet(s->pb, pkt, par->block_align ? par->block_align :
191  1024 * par->ch_layout.nb_channels);
192  }
193 
194  pkt->stream_index = 0;
195  return ret;
196 }
197 
198 const AVInputFormat ff_genh_demuxer = {
199  .name = "genh",
200  .long_name = NULL_IF_CONFIG_SMALL("GENeric Header"),
201  .priv_data_size = sizeof(GENHDemuxContext),
202  .read_probe = genh_probe,
203  .read_header = genh_read_header,
204  .read_packet = genh_read_packet,
205  .extensions = "genh",
206 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:326
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:76
AV_CODEC_ID_ADPCM_IMA_QT
@ AV_CODEC_ID_ADPCM_IMA_QT
Definition: codec_id.h:365
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: options.c:243
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:58
AV_CHANNEL_LAYOUT_STEREO
#define AV_CHANNEL_LAYOUT_STEREO
Definition: channel_layout.h:369
AV_CODEC_ID_ADPCM_DTK
@ AV_CODEC_ID_ADPCM_DTK
Definition: codec_id.h:398
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:54
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
av_unused
#define av_unused
Definition: attributes.h:131
GENHDemuxContext::dsp_int_type
unsigned dsp_int_type
Definition: genh.c:28
AVPacket::data
uint8_t * data
Definition: packet.h:374
AV_CODEC_ID_PCM_S16BE_PLANAR
@ AV_CODEC_ID_PCM_S16BE_PLANAR
Definition: codec_id.h:356
GENHDemuxContext::interleave_size
unsigned interleave_size
Definition: genh.c:29
AV_CODEC_ID_ADPCM_AICA
@ AV_CODEC_ID_ADPCM_AICA
Definition: codec_id.h:403
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:311
AV_CODEC_ID_PCM_S16LE_PLANAR
@ AV_CODEC_ID_PCM_S16LE_PLANAR
Definition: codec_id.h:344
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:463
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: avformat.c:771
AV_CODEC_ID_PCM_S16BE
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:327
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:500
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:897
AV_CODEC_ID_PCM_S8
@ AV_CODEC_ID_PCM_S8
Definition: codec_id.h:330
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:546
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_read_callback.c:41
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:256
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:97
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:551
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:453
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVFormatContext
Format I/O context.
Definition: avformat.h:1104
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:861
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:545
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
AV_CODEC_ID_ADPCM_IMA_WS
@ AV_CODEC_ID_ADPCM_IMA_WS
Definition: codec_id.h:369
ff_genh_demuxer
const AVInputFormat ff_genh_demuxer
Definition: genh.c:198
genh_read_packet
static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: genh.c:164
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:451
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:213
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:178
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:751
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:115
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:301
align
static const uint8_t *BS_FUNC() align(BSCTX *bc)
Skip bits to a byte boundary.
Definition: bitstream_template.h:411
AV_WL16
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:185
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:102
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:838
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:252
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:42
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:633
AVPacket::stream_index
int stream_index
Definition: packet.h:376
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:339
AV_CODEC_ID_ADPCM_THP
@ AV_CODEC_ID_ADPCM_THP
Definition: codec_id.h:383
read_probe
static int read_probe(const AVProbeData *p)
Definition: cdg.c:29
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:104
AV_CODEC_ID_PCM_U8
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:331
AV_CODEC_ID_SDX2_DPCM
@ AV_CODEC_ID_SDX2_DPCM
Definition: codec_id.h:431
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AV_CHANNEL_LAYOUT_MONO
#define AV_CHANNEL_LAYOUT_MONO
Definition: channel_layout.h:368
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:62
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AV_CODEC_ID_ADPCM_IMA_WAV
@ AV_CODEC_ID_ADPCM_IMA_WAV
Definition: codec_id.h:366
AV_CODEC_ID_PCM_S8_PLANAR
@ AV_CODEC_ID_PCM_S8_PLANAR
Definition: codec_id.h:353
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:402
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:238
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:367
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