FFmpeg
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 
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 vmd_frame {
41  int64_t frame_offset;
42  unsigned int frame_size;
43  int64_t pts;
44  int keyframe;
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(const 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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
122  vst->codecpar->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
123  vst->codecpar->codec_tag = 0; /* no fourcc */
124  vst->codecpar->width = width;
125  vst->codecpar->height = height;
126  if(vmd->is_indeo3 && vst->codecpar->width > 320){
127  vst->codecpar->width >>= 1;
128  vst->codecpar->height >>= 1;
129  }
130  if ((ret = ff_alloc_extradata(vst->codecpar, VMD_HEADER_SIZE)) < 0)
131  return ret;
132  memcpy(vst->codecpar->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->codecpar->codec_tag = 0; /* no fourcc */
145  st->codecpar->sample_rate = vmd->sample_rate;
146  st->codecpar->block_align = AV_RL16(&vmd->vmd_header[806]);
147  if (st->codecpar->block_align & 0x8000) {
149  st->codecpar->block_align = -(st->codecpar->block_align - 0x10000);
150  } else {
152  }
153  if (vmd->vmd_header[811] & 0x80) {
154  st->codecpar->channels = 2;
156  } else if (vmd->vmd_header[811] & 0x2) {
157  /* Shivers 2 stereo audio */
158  /* Frame length is for 1 channel */
159  st->codecpar->channels = 2;
161  st->codecpar->block_align = st->codecpar->block_align << 1;
162  } else {
163  st->codecpar->channels = 1;
165  }
166  st->codecpar->bit_rate = st->codecpar->sample_rate *
168 
169  /* calculate pts */
170  num = st->codecpar->block_align;
171  den = st->codecpar->sample_rate * st->codecpar->channels;
172  av_reduce(&num, &den, num, den, (1UL<<31)-1);
173  if (vst)
174  avpriv_set_pts_info(vst, 33, num, den);
175  avpriv_set_pts_info(st, 33, num, den);
176  }
177  if (!s->nb_streams)
178  return AVERROR_INVALIDDATA;
179 
180  toc_offset = AV_RL32(&vmd->vmd_header[812]);
181  vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
182  vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
183  avio_seek(pb, toc_offset, SEEK_SET);
184 
185  raw_frame_table = NULL;
186  vmd->frame_table = NULL;
187  sound_buffers = AV_RL16(&vmd->vmd_header[808]);
188  raw_frame_table_size = vmd->frame_count * 6;
189  if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
190  av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
191  return -1;
192  }
193  raw_frame_table = av_malloc(raw_frame_table_size);
194  vmd->frame_table = av_malloc_array(vmd->frame_count * vmd->frames_per_block + sound_buffers, sizeof(vmd_frame));
195  if (!raw_frame_table || !vmd->frame_table) {
196  ret = AVERROR(ENOMEM);
197  goto error;
198  }
199  if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
200  raw_frame_table_size) {
201  ret = AVERROR(EIO);
202  goto error;
203  }
204 
205  total_frames = 0;
206  for (i = 0; i < vmd->frame_count; i++) {
207 
208  current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
209 
210  /* handle each entry in index block */
211  for (j = 0; j < vmd->frames_per_block; j++) {
212  int type;
213  uint32_t size;
214 
216  av_log(s, AV_LOG_ERROR, "Failed to read frame record\n");
217  if (ret >= 0)
219  goto error;
220  }
221  type = chunk[0];
222  size = AV_RL32(&chunk[2]);
223  if (size > INT_MAX / 2) {
224  av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
226  goto error;
227  }
228  if(!size && type != 1)
229  continue;
230  switch(type) {
231  case 1: /* Audio Chunk */
232  if (!st) break;
233  /* first audio chunk contains several audio buffers */
234  vmd->frame_table[total_frames].frame_offset = current_offset;
235  vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
236  vmd->frame_table[total_frames].frame_size = size;
237  memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
238  vmd->frame_table[total_frames].pts = current_audio_pts;
239  total_frames++;
240  if(!current_audio_pts)
241  current_audio_pts += sound_buffers - 1;
242  else
243  current_audio_pts++;
244  break;
245  case 2: /* Video Chunk */
246  if (!vst)
247  break;
248  vmd->frame_table[total_frames].frame_offset = current_offset;
249  vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
250  vmd->frame_table[total_frames].frame_size = size;
251  memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
252  vmd->frame_table[total_frames].pts = i;
253  total_frames++;
254  break;
255  }
256  current_offset += size;
257  }
258  }
259 
260  av_free(raw_frame_table);
261 
262  vmd->current_frame = 0;
263  vmd->frame_count = total_frames;
264 
265  return 0;
266 
267 error:
268  av_freep(&raw_frame_table);
269  av_freep(&vmd->frame_table);
270  return ret;
271 }
272 
274  AVPacket *pkt)
275 {
276  VmdDemuxContext *vmd = s->priv_data;
277  AVIOContext *pb = s->pb;
278  int ret = 0;
279  vmd_frame *frame;
280 
281  if (vmd->current_frame >= vmd->frame_count)
282  return AVERROR_EOF;
283 
284  frame = &vmd->frame_table[vmd->current_frame];
285  /* position the stream (will probably be there already) */
286  avio_seek(pb, frame->frame_offset, SEEK_SET);
287 
288  if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
289  return AVERROR(EIO);
291  if (ret < 0)
292  return ret;
293  pkt->pos= avio_tell(pb);
294  memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
295  if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
296  ret = avio_read(pb, pkt->data, frame->frame_size);
297  else
299  frame->frame_size);
300 
301  if (ret != frame->frame_size) {
302  ret = AVERROR(EIO);
303  }
304  pkt->stream_index = frame->stream_index;
305  pkt->pts = frame->pts;
306  av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
307  (frame->frame_record[0] == 0x02) ? "video" : "audio",
308  frame->frame_size + BYTES_PER_FRAME_RECORD,
309  pkt->pts);
310 
311  vmd->current_frame++;
312 
313  return ret;
314 }
315 
317 {
318  VmdDemuxContext *vmd = s->priv_data;
319 
320  av_freep(&vmd->frame_table);
321 
322  return 0;
323 }
324 
326  .name = "vmd",
327  .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD"),
328  .priv_data_size = sizeof(VmdDemuxContext),
333 };
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:30
AVERROR
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
VMD_HEADER_SIZE
#define VMD_HEADER_SIZE
Definition: sierravmd.c:36
vmd_frame
Definition: sierravmd.c:39
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:90
vmd_read_close
static int vmd_read_close(AVFormatContext *s)
Definition: sierravmd.c:316
w
uint8_t w
Definition: llviddspenc.c:39
AV_CODEC_ID_INDEO3
@ AV_CODEC_ID_INDEO3
Definition: codec_id.h:77
AVPacket::data
uint8_t * data
Definition: packet.h:369
VmdDemuxContext::frame_count
unsigned int frame_count
Definition: sierravmd.c:52
VmdDemuxContext::frames_per_block
unsigned int frames_per_block
Definition: sierravmd.c:53
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
sample_rate
sample_rate
Definition: ffmpeg_filter.c:170
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
vmd_frame::stream_index
int stream_index
Definition: sierravmd.c:40
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
av_reduce
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
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:91
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
AVInputFormat
Definition: avformat.h:640
VmdDemuxContext::is_indeo3
int is_indeo3
Definition: sierravmd.c:56
VmdDemuxContext::current_frame
unsigned int current_frame
Definition: sierravmd.c:55
width
#define width
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
av_new_packet
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
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AV_CODEC_ID_VMDAUDIO
@ AV_CODEC_ID_VMDAUDIO
Definition: codec_id.h:435
vmd_frame::keyframe
int keyframe
Definition: sierravmd.c:44
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:94
VmdDemuxContext::frame_table
vmd_frame * frame_table
Definition: sierravmd.c:54
vmd_probe
static int vmd_probe(const AVProbeData *p)
Definition: sierravmd.c:65
VmdDemuxContext::vmd_header
unsigned char vmd_header[VMD_HEADER_SIZE]
Definition: sierravmd.c:62
AVFormatContext
Format I/O context.
Definition: avformat.h:1232
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
ff_vmd_demuxer
AVInputFormat ff_vmd_demuxer
Definition: sierravmd.c:325
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
VmdDemuxContext::skiphdr
int skiphdr
Definition: sierravmd.c:60
VmdDemuxContext::video_stream_index
int video_stream_index
Definition: sierravmd.c:49
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
AV_CODEC_ID_VMDVIDEO
@ AV_CODEC_ID_VMDVIDEO
Definition: codec_id.h:101
VmdDemuxContext::sample_rate
int sample_rate
Definition: sierravmd.c:58
AVPROBE_SCORE_EXTENSION
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
avpriv_set_pts_info
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:4945
vmd_read_header
static int vmd_read_header(AVFormatContext *s)
Definition: sierravmd.c:85
size
int size
Definition: twinvq_data.h:10344
height
#define height
ffio_limit
int ffio_limit(AVIOContext *s, int size)
Definition: utils.c:244
vmd_frame::pts
int64_t pts
Definition: sierravmd.c:43
i
int i
Definition: input.c:407
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
avio_internal.h
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:177
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:32
vmd_read_packet
static int vmd_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: sierravmd.c:273
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:873
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
avformat.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
VmdDemuxContext
Definition: sierravmd.c:48
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:874
channel_layout.h
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
BYTES_PER_FRAME_RECORD
#define BYTES_PER_FRAME_RECORD
Definition: sierravmd.c:37
VmdDemuxContext::audio_stream_index
int audio_stream_index
Definition: sierravmd.c:50
AVPacket::stream_index
int stream_index
Definition: packet.h:371
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
vmd_frame::frame_size
unsigned int frame_size
Definition: sierravmd.c:42
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
VmdDemuxContext::audio_sample_counter
int64_t audio_sample_counter
Definition: sierravmd.c:59
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:346
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:389
AVCodecParameters::channel_layout
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
h
h
Definition: vp9dsp_template.c:2038
vmd_frame::frame_offset
int64_t frame_offset
Definition: sierravmd.c:41
vmd_frame::frame_record
unsigned char frame_record[BYTES_PER_FRAME_RECORD]
Definition: sierravmd.c:45
ff_alloc_extradata
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0.
Definition: utils.c:3314