FFmpeg  4.4
imx.c
Go to the documentation of this file.
1 /*
2  * Simbiosis game demuxer
3  *
4  * Copyright (C) 2021 Paul B Mahol
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "avformat.h"
24 #include "internal.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/avassert.h"
27 #include "libavutil/internal.h"
28 
29 #define IMX_TAG MKTAG('I', 'M', 'A', 'X')
30 
31 typedef struct SimbiosisIMXDemuxContext {
36 
37 static int simbiosis_imx_probe(const AVProbeData *p)
38 {
39  if (AV_RL32(p->buf) != IMX_TAG)
40  return 0;
41  if (AV_RN32(p->buf+4) == 0)
42  return 0;
43  if (AV_RN16(p->buf+8) == 0)
44  return 0;
45  if (AV_RL16(p->buf+10) != 0x102)
46  return 0;
47 
48  return AVPROBE_SCORE_EXTENSION + 10;
49 }
50 
52 {
53  AVIOContext *pb = s->pb;
54  AVStream *vst, *ast;
55  int rate;
56 
57  vst = avformat_new_stream(s, NULL);
58  ast = avformat_new_stream(s, NULL);
59  if (!vst || !ast)
60  return AVERROR(ENOMEM);
61 
62  avio_skip(pb, 4);
63 
65  vst->codecpar->codec_tag = 0;
68  vst->start_time = 0;
69  vst->duration =
70  vst->nb_frames = avio_rl32(pb);
71  rate = avio_rl16(pb);
72  avio_skip(pb, 12);
73 
74  avpriv_set_pts_info(vst, 64, 1, rate);
75 
77  ast->codecpar->codec_tag = 0;
79  ast->codecpar->channels = 1;
81  ast->codecpar->sample_rate = 22050;
82  ast->start_time = 0;
83 
84  avpriv_set_pts_info(ast, 64, 1, 22050);
85 
86  return 0;
87 }
88 
90 {
91  AVIOContext *pb = s->pb;
92  SimbiosisIMXDemuxContext *imx = s->priv_data;
93  uint32_t chunk_size, chunk_type;
94  int64_t pos = avio_tell(pb);
95  int ret, idx = -1;
96 
97 retry:
98  if (avio_feof(pb))
99  return AVERROR_EOF;
100 
101  chunk_size = avio_rl32(pb);
102  chunk_type = avio_rl32(pb);
103 
104  switch (chunk_type) {
105  case 0xAAFF:
106  return AVERROR_EOF;
107  case 0xAA99:
108  idx = 1;
109  break;
110  case 0xAA97:
111  idx = 0;
112  if (!imx->first_video_packet_pos)
114  break;
115  case 0xAA98:
116  if (chunk_size > 256 * 3)
117  return AVERROR_INVALIDDATA;
118  for (int i = 0; i < chunk_size / 3; i++) {
119  unsigned r = avio_r8(pb) << 18;
120  unsigned g = avio_r8(pb) << 10;
121  unsigned b = avio_r8(pb) << 2;
122 
123  AV_WL32(imx->pal + i * 4, (0xFFU << 24) | r | g | b);
124  }
125  imx->pal_changed = 1;
126  idx = -1;
127  break;
128  default:
129  return AVERROR_INVALIDDATA;
130  }
131 
132  if (idx == -1)
133  goto retry;
134 
135  ret = av_get_packet(pb, pkt, chunk_size);
136  if (ret < 0)
137  return ret;
138 
139  if (imx->pal_changed && idx == 0) {
142  if (!pal)
143  return AVERROR(ENOMEM);
144  memcpy(pal, imx->pal, AVPALETTE_SIZE);
145  imx->pal_changed = 0;
146  if (pos <= imx->first_video_packet_pos)
148  } else if (idx == 1) {
150  }
151 
152  pkt->pos = pos;
153  pkt->stream_index = idx;
154  pkt->duration = idx ? chunk_size : 1;
155 
156  return ret;
157 }
158 
160  .name = "simbiosis_imx",
161  .long_name = NULL_IF_CONFIG_SMALL("Simbiosis Interactive IMX"),
162  .priv_data_size = sizeof(SimbiosisIMXDemuxContext),
166  .extensions = "imx",
168 };
uint8_t
simple assert() macros that are a bit more flexible than ISO C assert().
Main libavformat public API header.
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
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
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:463
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
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
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
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, buffer_size_t size)
Definition: avpacket.c:343
#define AV_RL16
Definition: intreadwrite.h:42
#define AV_RL32
Definition: intreadwrite.h:146
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
#define NULL
Definition: coverity.c:32
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
#define AV_CH_LAYOUT_MONO
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:318
@ AV_CODEC_ID_SIMBIOSIS_IMX
Definition: codec_id.h:308
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:410
@ AV_PKT_DATA_PALETTE
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette.
Definition: packet.h:46
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4505
#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
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
int i
Definition: input.c:407
#define AV_RN32(p)
Definition: intreadwrite.h:364
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
#define AV_RN16(p)
Definition: intreadwrite.h:360
static int simbiosis_imx_probe(const AVProbeData *p)
Definition: imx.c:37
static int simbiosis_imx_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: imx.c:89
static int simbiosis_imx_read_header(AVFormatContext *s)
Definition: imx.c:51
AVInputFormat ff_simbiosis_imx_demuxer
Definition: imx.c:159
#define IMX_TAG
Definition: imx.c:29
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
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
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
unsigned int pos
Definition: spdifenc.c:412
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
int channels
Audio only.
Definition: codec_par.h:166
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
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
Bytestream IO Context.
Definition: avio.h:161
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
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:375
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:387
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:389
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 nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:924
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:912
int64_t first_video_packet_pos
Definition: imx.c:34
uint8_t pal[AVPALETTE_SIZE]
Definition: imx.c:32
AVPacket * pkt
Definition: movenc.c:59
const char * b
Definition: vf_curves.c:118
const char * g
Definition: vf_curves.c:117
const char * r
Definition: vf_curves.c:116