FFmpeg
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 
43 static int cdxl_read_probe(const AVProbeData *p)
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 (cdxl->header[19] == 0 ||
135  FFALIGN(width, 16) * (uint64_t)height * cdxl->header[19] > INT_MAX)
136  return AVERROR_INVALIDDATA;
137  if (format == 0x20)
138  image_size = width * height * cdxl->header[19] / 8;
139  else
140  image_size = FFALIGN(width, 16) * height * cdxl->header[19] / 8;
141  video_size = palette_size + image_size;
142 
143  if (palette_size > 512)
144  return AVERROR_INVALIDDATA;
145  if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE)
146  return AVERROR_INVALIDDATA;
147 
148  if (cdxl->read_chunk && audio_size) {
149  if (cdxl->audio_stream_index == -1) {
151  if (!st)
152  return AVERROR(ENOMEM);
153 
155  st->codecpar->codec_tag = 0;
157  if (cdxl->header[1] & 0x10) {
158  st->codecpar->channels = 2;
160  } else {
161  st->codecpar->channels = 1;
163  }
164  st->codecpar->sample_rate = cdxl->sample_rate;
165  st->start_time = 0;
166  cdxl->audio_stream_index = st->index;
167  avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate);
168  }
169 
170  ret = av_get_packet(pb, pkt, audio_size);
171  if (ret < 0)
172  return ret;
173  pkt->stream_index = cdxl->audio_stream_index;
174  pkt->pos = pos;
175  pkt->duration = audio_size;
176  cdxl->read_chunk = 0;
177  } else {
178  if (cdxl->video_stream_index == -1) {
180  if (!st)
181  return AVERROR(ENOMEM);
182 
184  st->codecpar->codec_tag = 0;
186  st->codecpar->width = width;
187  st->codecpar->height = height;
188 
189  if (audio_size + video_size && cdxl->filesize > 0) {
190  frames = cdxl->filesize / (audio_size + video_size);
191 
192  if(cdxl->framerate)
193  st->duration = frames;
194  else
195  st->duration = frames * (int64_t)audio_size;
196  }
197  st->start_time = 0;
198  cdxl->video_stream_index = st->index;
199  if (cdxl->framerate)
200  avpriv_set_pts_info(st, 64, cdxl->fps.den, cdxl->fps.num);
201  else
202  avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate);
203  }
204 
205  if (av_new_packet(pkt, video_size + CDXL_HEADER_SIZE) < 0)
206  return AVERROR(ENOMEM);
207  memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE);
208  ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size);
209  if (ret < 0) {
210  av_packet_unref(pkt);
211  return ret;
212  }
214  pkt->stream_index = cdxl->video_stream_index;
215  pkt->flags |= AV_PKT_FLAG_KEY;
216  pkt->pos = pos;
217  pkt->duration = cdxl->framerate ? 1 : audio_size ? audio_size : 220;
218  cdxl->read_chunk = audio_size;
219  }
220 
221  if (!cdxl->read_chunk)
222  avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE);
223  return ret;
224 }
225 
226 #define OFFSET(x) offsetof(CDXLDemuxContext, x)
227 static const AVOption cdxl_options[] = {
228  { "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 11025 }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
229  { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
230  { NULL },
231 };
232 
233 static const AVClass cdxl_demuxer_class = {
234  .class_name = "CDXL demuxer",
235  .item_name = av_default_item_name,
236  .option = cdxl_options,
237  .version = LIBAVUTIL_VERSION_INT,
238 };
239 
241  .name = "cdxl",
242  .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
243  .priv_data_size = sizeof(CDXLDemuxContext),
247  .extensions = "cdxl,xl",
249  .priv_class = &cdxl_demuxer_class,
250 };
#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 avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:339
int av_parse_video_rate(AVRational *rate, const char *arg)
Parse str and store the detected values in *rate.
Definition: parseutils.c:179
AVOption.
Definition: opt.h:246
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1500
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:4926
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
int num
Numerator.
Definition: rational.h:59
int index
stream index in AVFormatContext
Definition: avformat.h:882
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:334
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1407
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
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 format(the sample packing is implied by the sample format) and sample rate.The lists are not just lists
static const AVClass cdxl_demuxer_class
Definition: cdxl.c:233
if it could not because there are no more frames
#define OFFSET(x)
Definition: cdxl.c:226
Format I/O context.
Definition: avformat.h:1358
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:4034
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1302
AVOptions.
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1498
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4499
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:1480
#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
#define FFALIGN(x, a)
Definition: macros.h:48
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4070
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:650
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:1512
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
static const AVOption cdxl_options[]
Definition: cdxl.c:227
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
int read_chunk
Definition: cdxl.c:36
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1486
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:449
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
uint8_t header[CDXL_HEADER_SIZE]
Definition: cdxl.c:37
audio channel layout utility functions
#define width
#define s(width, name)
Definition: cbs_vp9.c:257
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVInputFormat ff_cdxl_demuxer
Definition: cdxl.c:240
char * framerate
Definition: cdxl.c:34
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
#define AV_RN16(p)
Definition: intreadwrite.h:360
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
Describe the class of an AVClass context structure.
Definition: log.h:67
static int cdxl_read_probe(const AVProbeData *p)
Definition: cdxl.c:43
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:468
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:277
int video_stream_index
Definition: cdxl.c:38
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:456
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
#define AV_RN32(p)
Definition: intreadwrite.h:364
misc parsing utilities
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static int cdxl_read_header(AVFormatContext *s)
Definition: cdxl.c:85
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:930
int sample_rate
Audio only.
Definition: avcodec.h:4078
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:920
int den
Denominator.
Definition: rational.h:60
int sample_rate
Definition: cdxl.c:33
void * priv_data
Format private data.
Definition: avformat.h:1386
#define AV_RN64(p)
Definition: intreadwrite.h:368
int channels
Audio only.
Definition: avcodec.h:4074
#define CDXL_HEADER_SIZE
Definition: cdxl.c:29
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:361
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3972
int stream_index
Definition: avcodec.h:1482
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
AVRational fps
Definition: cdxl.c:35
This structure stores compressed data.
Definition: avcodec.h:1457
int64_t filesize
Definition: cdxl.c:40