FFmpeg
imx.c
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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;
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)
147  pkt->flags |= AV_PKT_FLAG_KEY;
148  } else if (idx == 1) {
149  pkt->flags |= AV_PKT_FLAG_KEY;
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 };
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:389
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:4999
const char * g
Definition: vf_curves.c:117
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
static int simbiosis_imx_probe(const AVProbeData *p)
Definition: imx.c:37
AVPacket * pkt
Definition: movenc.c:59
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:91
Format I/O context.
Definition: avformat.h:1247
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, buffer_size_t size)
Definition: avpacket.c:343
static int simbiosis_imx_read_header(AVFormatContext *s)
Definition: imx.c:51
uint8_t
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:387
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4553
#define AVERROR_EOF
End of file.
Definition: error.h:55
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
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:410
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette...
Definition: packet.h:46
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:117
const char * r
Definition: vf_curves.c:116
unsigned int pos
Definition: spdifenc.c:412
static int simbiosis_imx_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: imx.c:89
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
simple assert() macros that are a bit more flexible than ISO C assert().
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:375
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
common internal API header
#define b
Definition: input.c:41
#define s(width, name)
Definition: cbs_vp9.c:257
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
Stream structure.
Definition: avformat.h:884
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVIOContext * pb
I/O context.
Definition: avformat.h:1289
int64_t first_video_packet_pos
Definition: imx.c:34
#define AV_RN16(p)
Definition: intreadwrite.h:360
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:463
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
#define AV_RN32(p)
Definition: intreadwrite.h:364
AVInputFormat ff_simbiosis_imx_demuxer
Definition: imx.c:159
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:933
int sample_rate
Audio only.
Definition: codec_par.h:170
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
Main libavformat public API header.
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:923
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:935
void * priv_data
Format private data.
Definition: avformat.h:1275
int channels
Audio only.
Definition: codec_par.h:166
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
uint8_t pal[AVPALETTE_SIZE]
Definition: imx.c:32
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1049
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
int stream_index
Definition: packet.h:371
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
#define AV_CH_LAYOUT_MONO
#define IMX_TAG
Definition: imx.c:29
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:91
This structure stores compressed data.
Definition: packet.h:346
int i
Definition: input.c:407
#define AV_WL32(p, v)
Definition: intreadwrite.h:426