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 "demux.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->ch_layout.nb_channels = avio_rl32(s->pb);
59  if (st->codecpar->ch_layout.nb_channels <= 0)
60  return AVERROR_INVALIDDATA;
61  if (st->codecpar->ch_layout.nb_channels == 1)
62  st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
63  else if (st->codecpar->ch_layout.nb_channels == 2)
64  st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
65  align =
66  c->interleave_size = avio_rl32(s->pb);
67  if (align < 0 || align > INT_MAX / st->codecpar->ch_layout.nb_channels)
68  return AVERROR_INVALIDDATA;
69  st->codecpar->block_align = align * st->codecpar->ch_layout.nb_channels;
70  st->codecpar->sample_rate = avio_rl32(s->pb);
71  if (st->codecpar->sample_rate < 0)
72  return AVERROR_INVALIDDATA;
73 
74  avio_skip(s->pb, 4);
75  st->duration = avio_rl32(s->pb);
76 
77  codec = avio_rl32(s->pb);
78  switch (codec) {
79  case 0: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; break;
80  case 1:
81  case 11: st->codecpar->bits_per_coded_sample = 4;
82  if (st->codecpar->ch_layout.nb_channels > INT_MAX / 36)
83  return AVERROR_INVALIDDATA;
84  st->codecpar->block_align = 36 * st->codecpar->ch_layout.nb_channels;
85  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WAV; break;
86  case 2: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_DTK; break;
87  case 3: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
88  AV_CODEC_ID_PCM_S16BE_PLANAR :
89  AV_CODEC_ID_PCM_S16BE; break;
90  case 4: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
91  AV_CODEC_ID_PCM_S16LE_PLANAR :
92  AV_CODEC_ID_PCM_S16LE; break;
93  case 5: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
94  AV_CODEC_ID_PCM_S8_PLANAR :
95  AV_CODEC_ID_PCM_S8; break;
96  case 6: if (st->codecpar->block_align > INT_MAX/1024)
97  return AVERROR_INVALIDDATA;
98  st->codecpar->codec_id = AV_CODEC_ID_SDX2_DPCM; break;
99  case 7: ret = ff_alloc_extradata(st->codecpar, 2);
100  if (ret < 0)
101  return ret;
102  AV_WL16(st->codecpar->extradata, 3);
103  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WS; break;
104  case 10: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA; break;
105  case 12: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_THP; break;
106  case 13: st->codecpar->codec_id = AV_CODEC_ID_PCM_U8; break;
107  case 17: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_QT; break;
108  default:
109  avpriv_request_sample(s, "codec %d", codec);
110  return AVERROR_PATCHWELCOME;
111  }
112 
113  start_offset = avio_rl32(s->pb);
114  header_size = avio_rl32(s->pb);
115 
116  if (header_size > start_offset)
117  return AVERROR_INVALIDDATA;
118 
119  if (header_size == 0)
120  start_offset = 0x800;
121 
122  coef[0] = avio_rl32(s->pb);
123  coef[1] = avio_rl32(s->pb);
124  c->dsp_int_type = avio_rl32(s->pb);
125  coef_type = avio_rl32(s->pb);
126  coef_splitted[0] = avio_rl32(s->pb);
127  coef_splitted[1] = avio_rl32(s->pb);
128 
129  if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_THP) {
130  if (st->codecpar->ch_layout.nb_channels > 2) {
131  avpriv_request_sample(s, "channels %d>2", st->codecpar->ch_layout.nb_channels);
132  return AVERROR_PATCHWELCOME;
133  }
134 
135  ff_alloc_extradata(st->codecpar, 32 * st->codecpar->ch_layout.nb_channels);
136  for (ch = 0; ch < st->codecpar->ch_layout.nb_channels; ch++) {
137  if (coef_type & 1) {
138  avpriv_request_sample(s, "coef_type & 1");
139  return AVERROR_PATCHWELCOME;
140  } else {
141  avio_seek(s->pb, coef[ch], SEEK_SET);
142  avio_read(s->pb, st->codecpar->extradata + 32 * ch, 32);
143  }
144  }
145 
146  if (c->dsp_int_type == 1) {
147  st->codecpar->block_align = 8 * st->codecpar->ch_layout.nb_channels;
148  if (c->interleave_size != 1 &&
149  c->interleave_size != 2 &&
150  c->interleave_size != 4)
151  return AVERROR_INVALIDDATA;
152  }
153  }
154 
155  if (st->codecpar->block_align <= 0)
156  return AVERROR_INVALIDDATA;
157 
158  avio_skip(s->pb, start_offset - avio_tell(s->pb));
159 
160  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
161 
162  return 0;
163 }
164 
165 static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
166 {
167  AVCodecParameters *par = s->streams[0]->codecpar;
168  GENHDemuxContext *c = s->priv_data;
169  int ret;
170 
171  if (c->dsp_int_type == 1 && par->codec_id == AV_CODEC_ID_ADPCM_THP &&
172  par->ch_layout.nb_channels > 1) {
173  int i, ch;
174 
175  if (avio_feof(s->pb))
176  return AVERROR_EOF;
177  ret = av_new_packet(pkt, 8 * par->ch_layout.nb_channels);
178  if (ret < 0)
179  return ret;
180  for (i = 0; i < 8 / c->interleave_size; i++) {
181  for (ch = 0; ch < par->ch_layout.nb_channels; ch++) {
182  pkt->data[ch * 8 + i*c->interleave_size+0] = avio_r8(s->pb);
183  pkt->data[ch * 8 + i*c->interleave_size+1] = avio_r8(s->pb);
184  }
185  }
186  ret = 0;
187  } else if (par->codec_id == AV_CODEC_ID_SDX2_DPCM) {
188  ret = av_get_packet(s->pb, pkt, par->block_align * 1024);
189 
190  } else {
191  ret = av_get_packet(s->pb, pkt, par->block_align ? par->block_align :
192  1024 * par->ch_layout.nb_channels);
193  }
194 
195  pkt->stream_index = 0;
196  return ret;
197 }
198 
199 const FFInputFormat ff_genh_demuxer = {
200  .p.name = "genh",
201  .p.long_name = NULL_IF_CONFIG_SMALL("GENeric Header"),
202  .p.extensions = "genh",
203  .priv_data_size = sizeof(GENHDemuxContext),
204  .read_probe = genh_probe,
205  .read_header = genh_read_header,
206  .read_packet = genh_read_packet,
207 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:334
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:69
AV_CODEC_ID_ADPCM_IMA_QT
@ AV_CODEC_ID_ADPCM_IMA_QT
Definition: codec_id.h:373
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
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
AV_CHANNEL_LAYOUT_STEREO
#define AV_CHANNEL_LAYOUT_STEREO
Definition: channel_layout.h:393
AV_CODEC_ID_ADPCM_DTK
@ AV_CODEC_ID_ADPCM_DTK
Definition: codec_id.h:406
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:47
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
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:29
AVPacket::data
uint8_t * data
Definition: packet.h:539
AV_CODEC_ID_PCM_S16BE_PLANAR
@ AV_CODEC_ID_PCM_S16BE_PLANAR
Definition: codec_id.h:364
GENHDemuxContext::interleave_size
unsigned interleave_size
Definition: genh.c:30
AV_CODEC_ID_ADPCM_AICA
@ AV_CODEC_ID_ADPCM_AICA
Definition: codec_id.h:411
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:327
AV_CODEC_ID_PCM_S16LE_PLANAR
@ AV_CODEC_ID_PCM_S16LE_PLANAR
Definition: codec_id.h:352
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:867
AV_CODEC_ID_PCM_S16BE
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:335
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:494
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:807
AV_CODEC_ID_PCM_S8
@ AV_CODEC_ID_PCM_S8
Definition: codec_id.h:338
pkt
AVPacket * pkt
Definition: movenc.c:60
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_read_callback.c:42
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
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: packet.c:98
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:553
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:1300
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:771
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:540
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:377
genh_read_packet
static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: genh.c:165
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:180
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:184
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:730
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:94
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:317
FFInputFormat::p
AVInputFormat p
The public AVInputFormat.
Definition: demux.h:46
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:408
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:603
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:191
demux.h
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:91
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:748
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:231
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:612
AVPacket::stream_index
int stream_index
Definition: packet.h:541
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:318
AV_CODEC_ID_ADPCM_THP
@ AV_CODEC_ID_ADPCM_THP
Definition: codec_id.h:391
read_probe
static int read_probe(const AVProbeData *p)
Definition: cdg.c:30
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:110
AV_CODEC_ID_PCM_U8
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:339
AV_CODEC_ID_SDX2_DPCM
@ AV_CODEC_ID_SDX2_DPCM
Definition: codec_id.h:439
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:392
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:516
AV_CODEC_ID_ADPCM_IMA_WAV
@ AV_CODEC_ID_ADPCM_IMA_WAV
Definition: codec_id.h:374
FFInputFormat
Definition: demux.h:42
AV_CODEC_ID_PCM_S8_PLANAR
@ AV_CODEC_ID_PCM_S8_PLANAR
Definition: codec_id.h:361
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
ff_genh_demuxer
const FFInputFormat ff_genh_demuxer
Definition: genh.c:199
AV_CODEC_ID_ADPCM_PSX
@ AV_CODEC_ID_ADPCM_PSX
Definition: codec_id.h:410
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:227
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:346
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