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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;
34  char *framerate;
40  int64_t filesize;
42 
44 {
45  int score = AVPROBE_SCORE_EXTENSION + 10;
46 
47  if (p->buf_size < CDXL_HEADER_SIZE)
48  return 0;
49 
50  /* reserved bytes should always be set to 0 */
51  if (AV_RN64(&p->buf[24]) || AV_RN16(&p->buf[10]))
52  return 0;
53 
54  /* check type */
55  if (p->buf[0] != 1)
56  return 0;
57 
58  /* check palette size */
59  if (AV_RB16(&p->buf[20]) > 512)
60  return 0;
61 
62  /* check number of planes */
63  if (p->buf[18] || !p->buf[19])
64  return 0;
65 
66  /* check widh and height */
67  if (!AV_RN16(&p->buf[14]) || !AV_RN16(&p->buf[16]))
68  return 0;
69 
70  /* chunk size */
71  if (AV_RB32(&p->buf[2]) < AV_RB16(&p->buf[22]) + AV_RB16(&p->buf[20]) + CDXL_HEADER_SIZE)
72  return 0;
73 
74  /* previous chunk size */
75  if (AV_RN32(&p->buf[6]))
76  score /= 2;
77 
78  /* current frame number, usually starts from 1 */
79  if (AV_RB16(&p->buf[12]) != 1)
80  score /= 2;
81 
82  return score;
83 }
84 
86 {
87  CDXLDemuxContext *cdxl = s->priv_data;
88  int ret;
89 
90  if (cdxl->framerate && (ret = av_parse_video_rate(&cdxl->fps, cdxl->framerate)) < 0) {
92  "Could not parse framerate: %s.\n", cdxl->framerate);
93  return ret;
94  }
95 
96  cdxl->read_chunk = 0;
97  cdxl->video_stream_index = -1;
98  cdxl->audio_stream_index = -1;
99 
100  cdxl->filesize = avio_size(s->pb);
101 
103 
104  return 0;
105 }
106 
108 {
109  CDXLDemuxContext *cdxl = s->priv_data;
110  AVIOContext *pb = s->pb;
111  uint32_t current_size, video_size, image_size;
112  uint16_t audio_size, palette_size, width, height;
113  int64_t pos;
114  int format, frames, ret;
115 
116  if (avio_feof(pb))
117  return AVERROR_EOF;
118 
119  pos = avio_tell(pb);
120  if (!cdxl->read_chunk &&
122  return AVERROR_EOF;
123  if (cdxl->header[0] != 1) {
124  av_log(s, AV_LOG_ERROR, "non-standard cdxl file\n");
125  return AVERROR_INVALIDDATA;
126  }
127 
128  format = cdxl->header[1] & 0xE0;
129  current_size = AV_RB32(&cdxl->header[2]);
130  width = AV_RB16(&cdxl->header[14]);
131  height = AV_RB16(&cdxl->header[16]);
132  palette_size = AV_RB16(&cdxl->header[20]);
133  audio_size = AV_RB16(&cdxl->header[22]);
134  if (FFALIGN(width, 16) * (uint64_t)height * cdxl->header[19] > INT_MAX)
135  return AVERROR_INVALIDDATA;
136  if (format == 0x20)
137  image_size = width * height * cdxl->header[19] / 8;
138  else
139  image_size = FFALIGN(width, 16) * height * cdxl->header[19] / 8;
140  video_size = palette_size + image_size;
141 
142  if (palette_size > 512)
143  return AVERROR_INVALIDDATA;
144  if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE)
145  return AVERROR_INVALIDDATA;
146 
147  if (cdxl->read_chunk && audio_size) {
148  if (cdxl->audio_stream_index == -1) {
150  if (!st)
151  return AVERROR(ENOMEM);
152 
154  st->codecpar->codec_tag = 0;
156  if (cdxl->header[1] & 0x10) {
157  st->codecpar->channels = 2;
159  } else {
160  st->codecpar->channels = 1;
162  }
163  st->codecpar->sample_rate = cdxl->sample_rate;
164  st->start_time = 0;
165  cdxl->audio_stream_index = st->index;
166  avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate);
167  }
168 
169  ret = av_get_packet(pb, pkt, audio_size);
170  if (ret < 0)
171  return ret;
172  pkt->stream_index = cdxl->audio_stream_index;
173  pkt->pos = pos;
174  pkt->duration = audio_size;
175  cdxl->read_chunk = 0;
176  } else {
177  if (cdxl->video_stream_index == -1) {
179  if (!st)
180  return AVERROR(ENOMEM);
181 
183  st->codecpar->codec_tag = 0;
185  st->codecpar->width = width;
186  st->codecpar->height = height;
187 
188  if (audio_size + video_size && cdxl->filesize > 0) {
189  frames = cdxl->filesize / (audio_size + video_size);
190 
191  if(cdxl->framerate)
192  st->duration = frames;
193  else
194  st->duration = frames * (int64_t)audio_size;
195  }
196  st->start_time = 0;
197  cdxl->video_stream_index = st->index;
198  if (cdxl->framerate)
199  avpriv_set_pts_info(st, 64, cdxl->fps.den, cdxl->fps.num);
200  else
201  avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate);
202  }
203 
204  if (av_new_packet(pkt, video_size + CDXL_HEADER_SIZE) < 0)
205  return AVERROR(ENOMEM);
206  memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE);
207  ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size);
208  if (ret < 0) {
209  av_packet_unref(pkt);
210  return ret;
211  }
213  pkt->stream_index = cdxl->video_stream_index;
214  pkt->flags |= AV_PKT_FLAG_KEY;
215  pkt->pos = pos;
216  pkt->duration = cdxl->framerate ? 1 : audio_size ? audio_size : 220;
217  cdxl->read_chunk = audio_size;
218  }
219 
220  if (!cdxl->read_chunk)
221  avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE);
222  return ret;
223 }
224 
225 #define OFFSET(x) offsetof(CDXLDemuxContext, x)
226 static const AVOption cdxl_options[] = {
227  { "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 11025 }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
228  { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
229  { NULL },
230 };
231 
232 static const AVClass cdxl_demuxer_class = {
233  .class_name = "CDXL demuxer",
234  .item_name = av_default_item_name,
235  .option = cdxl_options,
236  .version = LIBAVUTIL_VERSION_INT,
237 };
238 
240  .name = "cdxl",
241  .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
242  .priv_data_size = sizeof(CDXLDemuxContext),
246  .extensions = "cdxl,xl",
248  .priv_class = &cdxl_demuxer_class,
249 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
Bytestream IO Context.
Definition: avio.h:147
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:309
int av_parse_video_rate(AVRational *rate, const char *arg)
Parse str and store the detected values in *rate.
Definition: parseutils.c:174
AVOption.
Definition: opt.h:245
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1610
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:101
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:4507
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3953
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:879
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:304
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1376
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
int audio_stream_index
Definition: cdxl.c:39
static const AVClass cdxl_demuxer_class
Definition: cdxl.c:232
#define OFFSET(x)
Definition: cdxl.c:225
Format I/O context.
Definition: avformat.h:1327
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
uint8_t
int width
Video only.
Definition: avcodec.h:4019
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1280
AVOptions.
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1608
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4140
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
#define height
uint8_t * data
Definition: avcodec.h:1590
#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:260
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:511
#define FFALIGN(x, a)
Definition: macros.h:48
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4055
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:604
static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: cdxl.c:107
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1622
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
static const AVOption cdxl_options[]
Definition: cdxl.c:226
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
int read_chunk
Definition: cdxl.c:36
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3949
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1596
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:464
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
uint8_t header[CDXL_HEADER_SIZE]
Definition: cdxl.c:37
audio channel layout utility functions
#define width
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
int frames
Definition: movenc.c:65
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:514
Stream structure.
Definition: avformat.h:878
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
sample_rate
AVInputFormat ff_cdxl_demuxer
Definition: cdxl.c:239
char * framerate
Definition: cdxl.c:34
AVIOContext * pb
I/O context.
Definition: avformat.h:1369
#define AV_RN16(p)
Definition: intreadwrite.h:360
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:563
static const char * format
Definition: movenc.c:47
Describe the class of an AVClass context structure.
Definition: log.h:67
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:487
Rational number (pair of numerator and denominator).
Definition: rational.h:58
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:276
int video_stream_index
Definition: cdxl.c:38
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:471
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
#define AV_RN32(p)
Definition: intreadwrite.h:364
misc parsing utilities
static int flags
Definition: cpu.c:47
static int cdxl_read_header(AVFormatContext *s)
Definition: cdxl.c:85
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:932
int sample_rate
Audio only.
Definition: avcodec.h:4063
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:925
int den
Denominator.
Definition: rational.h:60
int sample_rate
Definition: cdxl.c:33
void * priv_data
Format private data.
Definition: avformat.h:1355
#define AV_RN64(p)
Definition: intreadwrite.h:368
int channels
Audio only.
Definition: avcodec.h:4059
#define CDXL_HEADER_SIZE
Definition: cdxl.c:29
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:662
AVCodecParameters * codecpar
Definition: avformat.h:1230
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:328
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3957
int stream_index
Definition: avcodec.h:1592
#define AV_CH_LAYOUT_MONO
AVRational fps
Definition: cdxl.c:35
This structure stores compressed data.
Definition: avcodec.h:1567
int64_t filesize
Definition: cdxl.c:40
static int cdxl_read_probe(AVProbeData *p)
Definition: cdxl.c:43