FFmpeg  4.3.7
bethsoftvid.c
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1 /*
2  * Bethsoft VID format Demuxer
3  * Copyright (c) 2007 Nicholas Tung
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 
22 /**
23  * @file
24  * @brief Bethesda Softworks VID (.vid) file demuxer
25  * @author Nicholas Tung [ntung (at. ntung com] (2007-03)
26  * @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
27  * @see http://www.svatopluk.com/andux/docs/dfvid.html
28  */
29 
31 #include "libavutil/imgutils.h"
32 #include "libavutil/intreadwrite.h"
33 #include "avformat.h"
34 #include "internal.h"
36 
37 #define BVID_PALETTE_SIZE 3 * 256
38 
39 #define DEFAULT_SAMPLE_RATE 11111
40 
41 typedef struct BVID_DemuxContext
42 {
43  int nframes;
44  int sample_rate; /**< audio sample rate */
45  int width; /**< video width */
46  int height; /**< video height */
47  /** delay value between frames, added to individual frame delay.
48  * custom units, which will be added to other custom units (~=16ms according
49  * to free, unofficial documentation) */
51  int video_index; /**< video stream index */
52  int audio_index; /**< audio stream index */
55 
57 
59 
60 static int vid_probe(const AVProbeData *p)
61 {
62  // little-endian VID tag, file starts with "VID\0"
63  if (AV_RL32(p->buf) != MKTAG('V', 'I', 'D', 0))
64  return 0;
65 
66  if (p->buf[4] != 2)
67  return AVPROBE_SCORE_MAX / 4;
68 
69  return AVPROBE_SCORE_MAX;
70 }
71 
73 {
74  BVID_DemuxContext *vid = s->priv_data;
75  AVIOContext *pb = s->pb;
76  int ret;
77 
78  /* load main header. Contents:
79  * bytes: 'V' 'I' 'D'
80  * int16s: always_512, nframes, width, height, delay, always_14
81  */
82  avio_skip(pb, 5);
83  vid->nframes = avio_rl16(pb);
84  vid->width = avio_rl16(pb);
85  vid->height = avio_rl16(pb);
87  avio_rl16(pb);
88 
89  ret = av_image_check_size(vid->width, vid->height, 0, s);
90  if (ret < 0)
91  return ret;
92 
93  // wait until the first packet to create each stream
94  vid->video_index = -1;
95  vid->audio_index = -1;
98 
99  return 0;
100 }
101 
102 #define BUFFER_PADDING_SIZE 1000
104  uint8_t block_type, AVFormatContext *s)
105 {
106  uint8_t * vidbuf_start = NULL;
107  int vidbuf_nbytes = 0;
108  int code;
109  int bytes_copied = 0;
110  int position, duration, npixels;
111  unsigned int vidbuf_capacity;
112  int ret = 0;
113  AVStream *st;
114 
115  if (vid->video_index < 0) {
116  st = avformat_new_stream(s, NULL);
117  if (!st)
118  return AVERROR(ENOMEM);
119  vid->video_index = st->index;
120  if (vid->audio_index < 0) {
121  avpriv_request_sample(s, "Using default video time base since "
122  "having no audio packet before the first "
123  "video packet");
124  }
125  avpriv_set_pts_info(st, 64, 185, vid->sample_rate);
128  st->codecpar->width = vid->width;
129  st->codecpar->height = vid->height;
130  }
131  st = s->streams[vid->video_index];
132  npixels = st->codecpar->width * st->codecpar->height;
133 
134  vidbuf_start = av_malloc(vidbuf_capacity = BUFFER_PADDING_SIZE);
135  if(!vidbuf_start)
136  return AVERROR(ENOMEM);
137 
138  // save the file position for the packet, include block type
139  position = avio_tell(pb) - 1;
140 
141  vidbuf_start[vidbuf_nbytes++] = block_type;
142 
143  // get the current packet duration
144  duration = vid->bethsoft_global_delay + avio_rl16(pb);
145 
146  // set the y offset if it exists (decoder header data should be in data section)
147  if(block_type == VIDEO_YOFF_P_FRAME){
148  if (avio_read(pb, &vidbuf_start[vidbuf_nbytes], 2) != 2) {
149  ret = AVERROR(EIO);
150  goto fail;
151  }
152  vidbuf_nbytes += 2;
153  }
154 
155  do{
156  uint8_t *tmp = av_fast_realloc(vidbuf_start, &vidbuf_capacity,
157  vidbuf_nbytes + BUFFER_PADDING_SIZE);
158  if (!tmp) {
159  ret = AVERROR(ENOMEM);
160  goto fail;
161  }
162  vidbuf_start = tmp;
163 
164  code = avio_r8(pb);
165  vidbuf_start[vidbuf_nbytes++] = code;
166 
167  if(code >= 0x80){ // rle sequence
168  if(block_type == VIDEO_I_FRAME)
169  vidbuf_start[vidbuf_nbytes++] = avio_r8(pb);
170  } else if(code){ // plain sequence
171  if (avio_read(pb, &vidbuf_start[vidbuf_nbytes], code) != code) {
172  ret = AVERROR(EIO);
173  goto fail;
174  }
175  vidbuf_nbytes += code;
176  }
177  bytes_copied += code & 0x7F;
178  if(bytes_copied == npixels){ // sometimes no stop character is given, need to keep track of bytes copied
179  // may contain a 0 byte even if read all pixels
180  if(avio_r8(pb))
181  avio_seek(pb, -1, SEEK_CUR);
182  break;
183  }
184  if (bytes_copied > npixels) {
185  ret = AVERROR_INVALIDDATA;
186  goto fail;
187  }
188  } while(code);
189 
190  // copy data into packet
191  if ((ret = av_new_packet(pkt, vidbuf_nbytes)) < 0)
192  goto fail;
193  memcpy(pkt->data, vidbuf_start, vidbuf_nbytes);
194 
195  pkt->pos = position;
196  pkt->stream_index = vid->video_index;
197  pkt->duration = duration;
198  if (block_type == VIDEO_I_FRAME)
199  pkt->flags |= AV_PKT_FLAG_KEY;
200 
201  /* if there is a new palette available, add it to packet side data */
202  if (vid->has_palette) {
205  if (!pdata) {
206  ret = AVERROR(ENOMEM);
207  av_log(s, AV_LOG_ERROR, "Failed to allocate palette side data\n");
208  goto fail;
209  }
210  memcpy(pdata, vid->palette, BVID_PALETTE_SIZE);
211  vid->has_palette = 0;
212  }
213 
214  vid->nframes--; // used to check if all the frames were read
215 fail:
216  av_free(vidbuf_start);
217  return ret;
218 }
219 
221  AVPacket *pkt)
222 {
223  BVID_DemuxContext *vid = s->priv_data;
224  AVIOContext *pb = s->pb;
225  unsigned char block_type;
226  int audio_length;
227  int ret_value;
228 
229  if(vid->is_finished || avio_feof(pb))
230  return AVERROR_EOF;
231 
232  block_type = avio_r8(pb);
233  switch(block_type){
234  case PALETTE_BLOCK:
235  if (vid->has_palette) {
236  av_log(s, AV_LOG_WARNING, "discarding unused palette\n");
237  vid->has_palette = 0;
238  }
240  return AVERROR(EIO);
241  }
242  vid->has_palette = 1;
243  return vid_read_packet(s, pkt);
244 
245  case FIRST_AUDIO_BLOCK:
246  avio_rl16(pb);
247  // soundblaster DAC used for sample rate, as on specification page (link above)
248  vid->sample_rate = 1000000 / (256 - avio_r8(pb));
249  case AUDIO_BLOCK:
250  if (vid->audio_index < 0) {
252  if (!st)
253  return AVERROR(ENOMEM);
254  vid->audio_index = st->index;
257  st->codecpar->channels = 1;
260  st->codecpar->sample_rate = vid->sample_rate;
261  st->codecpar->bit_rate = 8 * st->codecpar->sample_rate;
262  st->start_time = 0;
263  avpriv_set_pts_info(st, 64, 1, vid->sample_rate);
264  }
265  audio_length = avio_rl16(pb);
266  if ((ret_value = av_get_packet(pb, pkt, audio_length)) != audio_length) {
267  if (ret_value < 0)
268  return ret_value;
269  av_log(s, AV_LOG_ERROR, "incomplete audio block\n");
270  return AVERROR(EIO);
271  }
272  pkt->stream_index = vid->audio_index;
273  pkt->duration = audio_length;
274  pkt->flags |= AV_PKT_FLAG_KEY;
275  return 0;
276 
277  case VIDEO_P_FRAME:
278  case VIDEO_YOFF_P_FRAME:
279  case VIDEO_I_FRAME:
280  return read_frame(vid, pb, pkt, block_type, s);
281 
282  case EOF_BLOCK:
283  if(vid->nframes != 0)
284  av_log(s, AV_LOG_VERBOSE, "reached terminating character but not all frames read.\n");
285  vid->is_finished = 1;
286  return AVERROR(EIO);
287  default:
288  av_log(s, AV_LOG_ERROR, "unknown block (character = %c, decimal = %d, hex = %x)!!!\n",
289  block_type, block_type, block_type);
290  return AVERROR_INVALIDDATA;
291  }
292 }
293 
295  .name = "bethsoftvid",
296  .long_name = NULL_IF_CONFIG_SMALL("Bethesda Softworks VID"),
297  .priv_data_size = sizeof(BVID_DemuxContext),
301 };
#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
int bethsoft_global_delay
delay value between frames, added to individual frame delay.
Definition: bethsoftvid.c:50
static int vid_read_header(AVFormatContext *s)
Definition: bethsoftvid.c:72
misc image utilities
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:375
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:4948
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int index
stream index in AVFormatContext
Definition: avformat.h:877
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:241
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
static AVPacket pkt
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1400
Format I/O context.
Definition: avformat.h:1351
int sample_rate
audio sample rate
Definition: bethsoftvid.c:44
uint8_t
#define av_malloc(s)
int width
Video only.
Definition: codec_par.h:126
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1295
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:373
#define BVID_PALETTE_SIZE
Definition: bethsoftvid.c:37
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4526
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
int64_t duration
Definition: movenc.c:63
uint8_t * data
Definition: packet.h:355
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
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:307
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_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:625
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:388
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:88
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette...
Definition: packet.h:46
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
const uint8_t * code
Definition: spdifenc.c:413
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int height
video height
Definition: bethsoftvid.c:46
#define DEFAULT_SAMPLE_RATE
Definition: bethsoftvid.c:39
int video_index
video stream index
Definition: bethsoftvid.c:51
#define fail()
Definition: checkasm.h:123
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:361
#define BUFFER_PADDING_SIZE
Definition: bethsoftvid.c:102
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:616
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:282
AVInputFormat ff_bethsoftvid_demuxer
Definition: bethsoftvid.c:294
audio channel layout utility functions
#define s(width, name)
Definition: cbs_vp9.c:257
void * av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
Reallocate the given buffer if it is not large enough, otherwise do nothing.
Definition: mem.c:478
#define AV_RL32
Definition: intreadwrite.h:146
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:545
Stream structure.
Definition: avformat.h:876
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:1393
static int vid_probe(const AVProbeData *p)
Definition: bethsoftvid.c:60
int audio_index
audio stream index
Definition: bethsoftvid.c:52
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
static int read_frame(BVID_DemuxContext *vid, AVIOContext *pb, AVPacket *pkt, uint8_t block_type, AVFormatContext *s)
Definition: bethsoftvid.c:103
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int sample_rate
Audio only.
Definition: codec_par.h:170
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:731
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:915
uint8_t palette[BVID_PALETTE_SIZE]
Definition: bethsoftvid.c:54
#define av_free(p)
void * priv_data
Format private data.
Definition: avformat.h:1379
static int vid_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: bethsoftvid.c:220
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
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:650
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:356
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:332
int stream_index
Definition: packet.h:357
#define AV_CH_LAYOUT_MONO
#define MKTAG(a, b, c, d)
Definition: common.h:406
This structure stores compressed data.
Definition: packet.h:332
int width
video width
Definition: bethsoftvid.c:45
static uint8_t tmp[11]
Definition: aes_ctr.c:26