FFmpeg  4.4
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/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;
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 
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 
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)
62  else if (st->codecpar->channels == 2)
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;
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 ?
83  AV_CODEC_ID_PCM_S16BE; break;
84  case 4: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
86  AV_CODEC_ID_PCM_S16LE; break;
87  case 5: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
89  AV_CODEC_ID_PCM_S8; break;
90  case 6: if (st->codecpar->block_align > INT_MAX/1024)
91  return AVERROR_INVALIDDATA;
93  case 7: ret = ff_alloc_extradata(st->codecpar, 2);
94  if (ret < 0)
95  return ret;
96  AV_WL16(st->codecpar->extradata, 3);
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 
124  if (st->codecpar->channels > 2) {
125  avpriv_request_sample(s, "channels %d>2", st->codecpar->channels);
126  return AVERROR_PATCHWELCOME;
127  }
128 
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 
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 
193  .name = "genh",
194  .long_name = NULL_IF_CONFIG_SMALL("GENeric Header"),
195  .priv_data_size = sizeof(GENHDemuxContext),
199  .extensions = "genh",
200 };
#define av_unused
Definition: attributes.h:131
Main libavformat public API header.
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
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
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define AV_RL32
Definition: intreadwrite.h:146
#define s(width, name)
Definition: cbs_vp9.c:257
#define MKTAG(a, b, c, d)
Definition: common.h:478
#define NULL
Definition: coverity.c:32
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
static int genh_probe(const AVProbeData *p)
Definition: genh.c:32
static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: genh.c:159
static int genh_read_header(AVFormatContext *s)
Definition: genh.c:42
AVInputFormat ff_genh_demuxer
Definition: genh.c:192
#define AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_STEREO
@ AV_CODEC_ID_ADPCM_IMA_WS
Definition: codec_id.h:357
@ AV_CODEC_ID_PCM_S16BE_PLANAR
Definition: codec_id.h:343
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:318
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:313
@ AV_CODEC_ID_ADPCM_DTK
Definition: codec_id.h:387
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:314
@ AV_CODEC_ID_ADPCM_PSX
Definition: codec_id.h:391
@ AV_CODEC_ID_SDX2_DPCM
Definition: codec_id.h:419
@ AV_CODEC_ID_PCM_S8
Definition: codec_id.h:317
@ AV_CODEC_ID_ADPCM_IMA_QT
Definition: codec_id.h:353
@ AV_CODEC_ID_ADPCM_AICA
Definition: codec_id.h:392
@ AV_CODEC_ID_ADPCM_THP
Definition: codec_id.h:371
@ AV_CODEC_ID_ADPCM_IMA_WAV
Definition: codec_id.h:354
@ AV_CODEC_ID_PCM_S16LE_PLANAR
Definition: codec_id.h:331
@ AV_CODEC_ID_PCM_S8_PLANAR
Definition: codec_id.h:340
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
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4505
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
int i
Definition: input.c:407
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
common internal api header.
#define FF_SANE_NB_CHANNELS
Definition: internal.h:102
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:4941
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:3312
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
int channels
Audio only.
Definition: codec_par.h:166
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int block_align
Audio only.
Definition: codec_par.h:177
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
uint8_t * data
Definition: packet.h:369
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
unsigned dsp_int_type
Definition: genh.c:28
unsigned interleave_size
Definition: genh.c:29
#define avpriv_request_sample(...)
AVPacket * pkt
Definition: movenc.c:59
static double c[64]