FFmpeg  2.1.1
sierravmd.c
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1 /*
2  * Sierra VMD Format Demuxer
3  * Copyright (c) 2004 The ffmpeg Project
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  * Sierra VMD file demuxer
25  * by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
26  * for more information on the Sierra VMD file format, visit:
27  * http://www.pcisys.net/~melanson/codecs/
28  */
29 
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/intreadwrite.h"
32 #include "avformat.h"
33 #include "internal.h"
34 #include "avio_internal.h"
35 
36 #define VMD_HEADER_SIZE 0x0330
37 #define BYTES_PER_FRAME_RECORD 16
38 
39 typedef struct {
41  int64_t frame_offset;
42  unsigned int frame_size;
43  int64_t pts;
44  int keyframe;
45  unsigned char frame_record[BYTES_PER_FRAME_RECORD];
46 } vmd_frame;
47 
48 typedef struct VmdDemuxContext {
51 
52  unsigned int frame_count;
53  unsigned int frames_per_block;
55  unsigned int current_frame;
56  int is_indeo3;
57 
60  int skiphdr;
61 
62  unsigned char vmd_header[VMD_HEADER_SIZE];
64 
65 static int vmd_probe(AVProbeData *p)
66 {
67  int w, h, sample_rate;
68  if (p->buf_size < 806)
69  return 0;
70  /* check if the first 2 bytes of the file contain the appropriate size
71  * of a VMD header chunk */
72  if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
73  return 0;
74  w = AV_RL16(&p->buf[12]);
75  h = AV_RL16(&p->buf[14]);
76  sample_rate = AV_RL16(&p->buf[804]);
77  if ((!w || w > 2048 || !h || h > 2048) &&
78  sample_rate != 22050)
79  return 0;
80 
81  /* only return half certainty since this check is a bit sketchy */
83 }
84 
86 {
87  VmdDemuxContext *vmd = s->priv_data;
88  AVIOContext *pb = s->pb;
89  AVStream *st = NULL, *vst = NULL;
90  unsigned int toc_offset;
91  unsigned char *raw_frame_table;
92  int raw_frame_table_size;
93  int64_t current_offset;
94  int i, j, ret;
95  int width, height;
96  unsigned int total_frames;
97  int64_t current_audio_pts = 0;
98  unsigned char chunk[BYTES_PER_FRAME_RECORD];
99  int num, den;
100  int sound_buffers;
101 
102  /* fetch the main header, including the 2 header length bytes */
103  avio_seek(pb, 0, SEEK_SET);
105  return AVERROR(EIO);
106 
107  width = AV_RL16(&vmd->vmd_header[12]);
108  height = AV_RL16(&vmd->vmd_header[14]);
109  if (width && height) {
110  if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') {
111  vmd->is_indeo3 = 1;
112  } else {
113  vmd->is_indeo3 = 0;
114  }
115  /* start up the decoders */
116  vst = avformat_new_stream(s, NULL);
117  if (!vst)
118  return AVERROR(ENOMEM);
119  avpriv_set_pts_info(vst, 33, 1, 10);
120  vmd->video_stream_index = vst->index;
121  vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
122  vst->codec->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
123  vst->codec->codec_tag = 0; /* no fourcc */
124  vst->codec->width = width;
125  vst->codec->height = height;
126  if(vmd->is_indeo3 && vst->codec->width > 320){
127  vst->codec->width >>= 1;
128  vst->codec->height >>= 1;
129  }
130  if (ff_alloc_extradata(vst->codec, VMD_HEADER_SIZE))
131  return AVERROR(ENOMEM);
132  memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
133  }
134 
135  /* if sample rate is 0, assume no audio */
136  vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
137  if (vmd->sample_rate) {
138  st = avformat_new_stream(s, NULL);
139  if (!st)
140  return AVERROR(ENOMEM);
141  vmd->audio_stream_index = st->index;
144  st->codec->codec_tag = 0; /* no fourcc */
145  if (vmd->vmd_header[811] & 0x80) {
146  st->codec->channels = 2;
148  } else {
149  st->codec->channels = 1;
151  }
152  st->codec->sample_rate = vmd->sample_rate;
153  st->codec->block_align = AV_RL16(&vmd->vmd_header[806]);
154  if (st->codec->block_align & 0x8000) {
155  st->codec->bits_per_coded_sample = 16;
156  st->codec->block_align = -(st->codec->block_align - 0x10000);
157  } else {
158  st->codec->bits_per_coded_sample = 8;
159  }
160  st->codec->bit_rate = st->codec->sample_rate *
162 
163  /* calculate pts */
164  num = st->codec->block_align;
165  den = st->codec->sample_rate * st->codec->channels;
166  av_reduce(&num, &den, num, den, (1UL<<31)-1);
167  if (vst)
168  avpriv_set_pts_info(vst, 33, num, den);
169  avpriv_set_pts_info(st, 33, num, den);
170  }
171 
172  toc_offset = AV_RL32(&vmd->vmd_header[812]);
173  vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
174  vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
175  avio_seek(pb, toc_offset, SEEK_SET);
176 
177  raw_frame_table = NULL;
178  vmd->frame_table = NULL;
179  sound_buffers = AV_RL16(&vmd->vmd_header[808]);
180  raw_frame_table_size = vmd->frame_count * 6;
181  if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
182  av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
183  return -1;
184  }
185  raw_frame_table = av_malloc(raw_frame_table_size);
186  vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame));
187  if (!raw_frame_table || !vmd->frame_table) {
188  ret = AVERROR(ENOMEM);
189  goto error;
190  }
191  if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
192  raw_frame_table_size) {
193  ret = AVERROR(EIO);
194  goto error;
195  }
196 
197  total_frames = 0;
198  for (i = 0; i < vmd->frame_count; i++) {
199 
200  current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
201 
202  /* handle each entry in index block */
203  for (j = 0; j < vmd->frames_per_block; j++) {
204  int type;
205  uint32_t size;
206 
207  avio_read(pb, chunk, BYTES_PER_FRAME_RECORD);
208  type = chunk[0];
209  size = AV_RL32(&chunk[2]);
210  if (size > INT_MAX / 2) {
211  av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
212  ret = AVERROR_INVALIDDATA;
213  goto error;
214  }
215  if(!size && type != 1)
216  continue;
217  switch(type) {
218  case 1: /* Audio Chunk */
219  if (!st) break;
220  /* first audio chunk contains several audio buffers */
221  vmd->frame_table[total_frames].frame_offset = current_offset;
222  vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
223  vmd->frame_table[total_frames].frame_size = size;
224  memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
225  vmd->frame_table[total_frames].pts = current_audio_pts;
226  total_frames++;
227  if(!current_audio_pts)
228  current_audio_pts += sound_buffers - 1;
229  else
230  current_audio_pts++;
231  break;
232  case 2: /* Video Chunk */
233  vmd->frame_table[total_frames].frame_offset = current_offset;
234  vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
235  vmd->frame_table[total_frames].frame_size = size;
236  memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
237  vmd->frame_table[total_frames].pts = i;
238  total_frames++;
239  break;
240  }
241  current_offset += size;
242  }
243  }
244 
245  av_free(raw_frame_table);
246 
247  vmd->current_frame = 0;
248  vmd->frame_count = total_frames;
249 
250  return 0;
251 
252 error:
253  av_freep(&raw_frame_table);
254  av_freep(&vmd->frame_table);
255  return ret;
256 }
257 
259  AVPacket *pkt)
260 {
261  VmdDemuxContext *vmd = s->priv_data;
262  AVIOContext *pb = s->pb;
263  int ret = 0;
264  vmd_frame *frame;
265 
266  if (vmd->current_frame >= vmd->frame_count)
267  return AVERROR_EOF;
268 
269  frame = &vmd->frame_table[vmd->current_frame];
270  /* position the stream (will probably be there already) */
271  avio_seek(pb, frame->frame_offset, SEEK_SET);
272 
273  if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
274  return AVERROR(EIO);
276  return AVERROR(ENOMEM);
277  pkt->pos= avio_tell(pb);
278  memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
279  if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
280  ret = avio_read(pb, pkt->data, frame->frame_size);
281  else
282  ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
283  frame->frame_size);
284 
285  if (ret != frame->frame_size) {
286  av_free_packet(pkt);
287  ret = AVERROR(EIO);
288  }
289  pkt->stream_index = frame->stream_index;
290  pkt->pts = frame->pts;
291  av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
292  (frame->frame_record[0] == 0x02) ? "video" : "audio",
294  pkt->pts);
295 
296  vmd->current_frame++;
297 
298  return ret;
299 }
300 
302 {
303  VmdDemuxContext *vmd = s->priv_data;
304 
305  av_freep(&vmd->frame_table);
306 
307  return 0;
308 }
309 
311  .name = "vmd",
312  .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD"),
313  .priv_data_size = sizeof(VmdDemuxContext),
318 };
unsigned int frame_count
Definition: sierravmd.c:52
const char * s
Definition: avisynth_c.h:668
Bytestream IO Context.
Definition: avio.h:68
int size
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:279
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:478
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1092
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:3922
#define AV_RL16(x)
Definition: intreadwrite.h:245
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:686
int index
stream index in AVFormatContext
Definition: avformat.h:668
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
int64_t audio_sample_counter
Definition: sierravmd.c:59
#define AV_CH_LAYOUT_STEREO
unsigned int frames_per_block
Definition: sierravmd.c:53
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:1910
void av_freep(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:234
unsigned int current_frame
Definition: sierravmd.c:55
Format I/O context.
Definition: avformat.h:968
static int vmd_read_close(AVFormatContext *s)
Definition: sierravmd.c:301
int audio_stream_index
Definition: sierravmd.c:50
int ffio_limit(AVIOContext *s, int size)
Definition: utils.c:133
int keyframe
Definition: sierravmd.c:44
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:336
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:248
int stream_index
Definition: sierravmd.c:40
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2563
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3348
static AVFrame * frame
Definition: demuxing.c:51
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:83
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: avcodec.h:4147
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:219
void * priv_data
Format private data.
Definition: avformat.h:988
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: avcodec.h:4168
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1934
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Definition: rational.c:35
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:337
int bit_rate
the average bitrate
Definition: avcodec.h:1204
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:54
ret
Definition: avfilter.c:961
AVInputFormat ff_vmd_demuxer
Definition: sierravmd.c:310
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:341
void * av_malloc(size_t size) av_malloc_attrib 1(1)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:73
#define BYTES_PER_FRAME_RECORD
Definition: sierravmd.c:37
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:199
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:592
Stream structure.
Definition: avformat.h:667
static int vmd_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: sierravmd.c:258
int video_stream_index
Definition: sierravmd.c:49
static int width
Definition: utils.c:158
sample_rate
enum AVMediaType codec_type
Definition: avcodec.h:1154
enum AVCodecID codec_id
Definition: avcodec.h:1157
int sample_rate
samples per second
Definition: avcodec.h:1873
vmd_frame * frame_table
Definition: sierravmd.c:54
static int vmd_read_header(AVFormatContext *s)
Definition: sierravmd.c:85
unsigned int codec_tag
fourcc (LSB first, so &quot;ABCD&quot; -&gt; (&#39;D&#39;&lt;&lt;24) + (&#39;C&#39;&lt;&lt;16) + (&#39;B&#39;&lt;&lt;8) + &#39;A&#39;).
Definition: avcodec.h:1172
int ff_alloc_extradata(AVCodecContext *avctx, int size)
Allocate extradata with additional FF_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:2690
AVIOContext * pb
I/O context.
Definition: avformat.h:1001
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
BYTE int const BYTE int int int height
Definition: avisynth_c.h:713
uint8_t * data
Definition: avcodec.h:1063
int64_t pts
Definition: sierravmd.c:43
This structure contains the data a format has to probe a file.
Definition: avformat.h:334
#define type
unsigned char vmd_header[VMD_HEADER_SIZE]
Definition: sierravmd.c:62
#define AVERROR_EOF
int64_t frame_offset
Definition: sierravmd.c:41
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:480
unsigned char frame_record[BYTES_PER_FRAME_RECORD]
Definition: sierravmd.c:45
Main libavformat public API header.
#define AVERROR_INVALIDDATA
#define AV_RL32(x)
Definition: intreadwrite.h:275
int channels
number of audio channels
Definition: avcodec.h:1874
#define AVERROR(e)
unsigned int frame_size
Definition: sierravmd.c:42
#define VMD_HEADER_SIZE
Definition: sierravmd.c:36
static AVPacket pkt
Definition: demuxing.c:52
static int vmd_probe(AVProbeData *p)
Definition: sierravmd.c:65
int stream_index
Definition: avcodec.h:1065
#define AV_CH_LAYOUT_MONO
This structure stores compressed data.
Definition: avcodec.h:1040
int64_t pts
Presentation timestamp in AVStream-&gt;time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1056