FFmpeg  4.4
cdxl.c
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1 /*
2  * CDXL demuxer
3  * Copyright (c) 2011-2012 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 
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/parseutils.h"
25 #include "libavutil/opt.h"
26 #include "avformat.h"
27 #include "internal.h"
28 
29 #define CDXL_HEADER_SIZE 32
30 
31 typedef struct CDXLDemuxContext {
32  AVClass *class;
35  int srate;
41  int64_t filesize;
42  int64_t pos;
44 
45 static int cdxl_read_probe(const AVProbeData *p)
46 {
47  int score = AVPROBE_SCORE_EXTENSION + 10;
48  const uint8_t *buf = p->buf;
49 
50  if (p->buf_size < CDXL_HEADER_SIZE)
51  return 0;
52 
53  /* check type */
54  if (buf[0] > 1)
55  return 0;
56 
57  /* reserved bytes should always be set to 0 */
58  if (AV_RL24(&buf[29]))
59  return 0;
60 
61  /* check palette size */
62  if (!AV_RN16(&buf[20]))
63  return 0;
64  if (buf[0] == 1 && AV_RB16(&buf[20]) > 512)
65  return 0;
66  if (buf[0] == 0 && AV_RB16(&buf[20]) > 768)
67  return 0;
68 
69  if (!AV_RN16(&buf[22]) && AV_RN16(&buf[24]))
70  return 0;
71 
72  if (buf[0] == 0 && (!buf[26] || !AV_RB16(&buf[24])))
73  return 0;
74 
75  /* check number of planes */
76  if (buf[19] != 6 && buf[19] != 8 && buf[19] != 24)
77  return 0;
78 
79  if (buf[18])
80  return 0;
81 
82  /* check widh and height */
83  if (AV_RB16(&buf[14]) > 640 || AV_RB16(&buf[16]) > 480 ||
84  AV_RB16(&buf[14]) == 0 || AV_RB16(&buf[16]) == 0)
85  return 0;
86 
87  /* chunk size */
88  if (AV_RB32(&buf[2]) <= AV_RB16(&buf[20]) + AV_RB16(&buf[22]) * (1 + !!(buf[1] & 0x10)) + CDXL_HEADER_SIZE)
89  return 0;
90 
91  /* previous chunk size */
92  if (AV_RN32(&buf[6]))
93  score /= 2;
94 
95  /* current frame number, usually starts from 1 */
96  if (AV_RB32(&buf[10]) != 1)
97  score /= 2;
98 
99  return score;
100 }
101 
103 {
104  CDXLDemuxContext *cdxl = s->priv_data;
105 
106  cdxl->read_chunk = 0;
107  cdxl->video_stream_index = -1;
108  cdxl->audio_stream_index = -1;
109 
110  cdxl->filesize = avio_size(s->pb);
111 
112  s->ctx_flags |= AVFMTCTX_NOHEADER;
113 
114  return 0;
115 }
116 
118 {
119  CDXLDemuxContext *cdxl = s->priv_data;
120  AVIOContext *pb = s->pb;
121  uint32_t current_size, video_size, image_size;
122  uint16_t audio_size, palette_size, width, height;
123  int channels, type, format, ret;
124 
125  if (avio_feof(pb))
126  return AVERROR_EOF;
127 
128  if (!cdxl->read_chunk) {
129  cdxl->pos = avio_tell(pb);
131  return AVERROR_EOF;
132  }
133  if (cdxl->header[0] > 1) {
134  av_log(s, AV_LOG_ERROR, "unsupported cdxl file\n");
135  return AVERROR_INVALIDDATA;
136  }
137 
138  type = cdxl->header[0];
139  channels = 1 + !!(cdxl->header[1] & 0x10);
140  format = cdxl->header[1] & 0xE0;
141  current_size = AV_RB32(&cdxl->header[2]);
142  width = AV_RB16(&cdxl->header[14]);
143  height = AV_RB16(&cdxl->header[16]);
144  palette_size = AV_RB16(&cdxl->header[20]);
145  audio_size = AV_RB16(&cdxl->header[22]) * channels;
146  cdxl->srate = AV_RB16(&cdxl->header[24]);
147  if (!cdxl->srate && audio_size)
148  cdxl->srate = cdxl->sample_rate;
149  cdxl->frate.num = cdxl->header[26];
150  cdxl->frate.den = 1;
151  if (cdxl->header[19] == 0 ||
152  FFALIGN(width, 16) * (uint64_t)height * cdxl->header[19] > INT_MAX)
153  return AVERROR_INVALIDDATA;
154  if (format == 0x20)
155  image_size = width * height * cdxl->header[19] / 8;
156  else
157  image_size = FFALIGN(width, 16) * height * cdxl->header[19] / 8;
158  video_size = palette_size + image_size;
159 
160  if ((type == 1 && palette_size > 512) ||
161  (type == 0 && palette_size > 768))
162  return AVERROR_INVALIDDATA;
163  if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE)
164  return AVERROR_INVALIDDATA;
165 
166  if (!cdxl->frate.num && audio_size && cdxl->srate > 0) {
167  cdxl->frate = (AVRational){ cdxl->srate, audio_size };
168  } else if (!cdxl->frate.num) {
169  cdxl->frate = cdxl->frame_rate;
170  }
171 
172  if (cdxl->read_chunk && audio_size) {
173  if (cdxl->audio_stream_index == -1) {
175  if (!st)
176  return AVERROR(ENOMEM);
177 
179  st->codecpar->codec_tag = 0;
181  st->codecpar->channels = channels;
183  st->codecpar->sample_rate= cdxl->srate;
184  st->start_time = 0;
185  cdxl->audio_stream_index = st->index;
186  avpriv_set_pts_info(st, 64, 1, cdxl->srate);
187  if (current_size && cdxl->filesize > 0 && audio_size > 0)
188  st->duration = (cdxl->filesize / current_size) * audio_size / channels;
189  }
190 
191  ret = av_get_packet(pb, pkt, audio_size);
192  if (ret < 0)
193  return ret;
195  pkt->pos = cdxl->pos;
196  pkt->duration = audio_size / channels;
197  cdxl->read_chunk = 0;
198  } else {
199  if (cdxl->video_stream_index == -1) {
201  if (!st)
202  return AVERROR(ENOMEM);
203 
205  st->codecpar->codec_tag = 0;
207  st->codecpar->width = width;
208  st->codecpar->height = height;
209 
210  if (current_size && cdxl->filesize > 0)
211  st->nb_frames = cdxl->filesize / current_size;
212  st->start_time = 0;
213  cdxl->video_stream_index = st->index;
214  avpriv_set_pts_info(st, 64, cdxl->frate.den, cdxl->frate.num);
215  }
216 
217  if ((ret = av_new_packet(pkt, video_size + CDXL_HEADER_SIZE)) < 0)
218  return ret;
219  memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE);
220  ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size);
221  if (ret < 0) {
222  return ret;
223  }
227  pkt->pos = cdxl->pos;
228  pkt->duration = 1;
229  cdxl->read_chunk = audio_size;
230  }
231 
232  if (!cdxl->read_chunk)
233  avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE);
234  return ret;
235 }
236 
237 static int read_seek(AVFormatContext *s, int stream_index,
238  int64_t timestamp, int flags)
239 {
240  CDXLDemuxContext *cdxl = s->priv_data;
241 
242  cdxl->read_chunk = 0;
243 
244  return -1;
245 }
246 
247 #define OFFSET(x) offsetof(CDXLDemuxContext, x)
248 static const AVOption cdxl_options[] = {
249  { "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64=11025 }, 8000, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
250  { "frame_rate", "", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, { .str="15" }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
251  { NULL },
252 };
253 
254 static const AVClass cdxl_demuxer_class = {
255  .class_name = "CDXL demuxer",
256  .item_name = av_default_item_name,
257  .option = cdxl_options,
258  .version = LIBAVUTIL_VERSION_INT,
259 };
260 
262  .name = "cdxl",
263  .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
264  .priv_data_size = sizeof(CDXLDemuxContext),
265  .priv_class = &cdxl_demuxer_class,
269  .read_seek = read_seek,
270  .extensions = "cdxl,xl",
272 };
static const char *const format[]
Definition: af_aiir.c:456
channels
Definition: aptx.h:33
uint8_t
Main libavformat public API header.
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1177
#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
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:342
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
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define AV_RB32
Definition: intreadwrite.h:130
#define AV_RL24
Definition: intreadwrite.h:78
#define AV_RB16
Definition: intreadwrite.h:53
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
audio channel layout utility functions
#define NULL
Definition: coverity.c:32
sample_rate
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
@ AV_OPT_TYPE_VIDEO_RATE
offset must point to AVRational
Definition: opt.h:238
@ AV_OPT_TYPE_INT
Definition: opt.h:225
#define AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_STEREO
@ AV_CODEC_ID_CDXL
Definition: codec_id.h:208
@ AV_CODEC_ID_PCM_S8_PLANAR
Definition: codec_id.h:340
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:410
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:114
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_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
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
cl_device_type type
#define AV_RN32(p)
Definition: intreadwrite.h:364
#define AV_RN16(p)
Definition: intreadwrite.h:360
static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: cdxl.c:237
static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: cdxl.c:117
static int cdxl_read_header(AVFormatContext *s)
Definition: cdxl.c:102
static int cdxl_read_probe(const AVProbeData *p)
Definition: cdxl.c:45
#define CDXL_HEADER_SIZE
Definition: cdxl.c:29
static const AVOption cdxl_options[]
Definition: cdxl.c:248
#define OFFSET(x)
Definition: cdxl.c:247
static const AVClass cdxl_demuxer_class
Definition: cdxl.c:254
AVInputFormat ff_cdxl_demuxer
Definition: cdxl.c:261
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
#define FFALIGN(x, a)
Definition: macros.h:48
AVOptions.
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:279
misc parsing utilities
Describe the class of an AVClass context structure.
Definition: log.h:67
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
int channels
Audio only.
Definition: codec_par.h:166
int width
Video only.
Definition: codec_par.h:126
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
AVOption.
Definition: opt.h:248
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
uint8_t * data
Definition: packet.h:369
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
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int num
Numerator.
Definition: rational.h:59
int den
Denominator.
Definition: rational.h:60
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
int index
stream index in AVFormatContext
Definition: avformat.h:874
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:912
int sample_rate
Definition: cdxl.c:37
int audio_stream_index
Definition: cdxl.c:40
int video_stream_index
Definition: cdxl.c:39
uint8_t header[CDXL_HEADER_SIZE]
Definition: cdxl.c:38
AVRational frame_rate
Definition: cdxl.c:36
int read_chunk
Definition: cdxl.c:33
AVRational frate
Definition: cdxl.c:34
int64_t filesize
Definition: cdxl.c:41
int64_t pos
Definition: cdxl.c:42
#define av_log(a,...)
AVPacket * pkt
Definition: movenc.c:59
#define height
#define width