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 (ff_alloc_extradata(vst->codecpar, VMD_HEADER_SIZE))
131  return AVERROR(ENOMEM);
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 
178  toc_offset = AV_RL32(&vmd->vmd_header[812]);
179  vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
180  vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
181  avio_seek(pb, toc_offset, SEEK_SET);
182 
183  raw_frame_table = NULL;
184  vmd->frame_table = NULL;
185  sound_buffers = AV_RL16(&vmd->vmd_header[808]);
186  raw_frame_table_size = vmd->frame_count * 6;
187  if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
188  av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
189  return -1;
190  }
191  raw_frame_table = av_malloc(raw_frame_table_size);
192  vmd->frame_table = av_malloc_array(vmd->frame_count * vmd->frames_per_block + sound_buffers, sizeof(vmd_frame));
193  if (!raw_frame_table || !vmd->frame_table) {
194  ret = AVERROR(ENOMEM);
195  goto error;
196  }
197  if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
198  raw_frame_table_size) {
199  ret = AVERROR(EIO);
200  goto error;
201  }
202 
203  total_frames = 0;
204  for (i = 0; i < vmd->frame_count; i++) {
205 
206  current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
207 
208  /* handle each entry in index block */
209  for (j = 0; j < vmd->frames_per_block; j++) {
210  int type;
211  uint32_t size;
212 
213  if ((ret = avio_read(pb, chunk, BYTES_PER_FRAME_RECORD)) != BYTES_PER_FRAME_RECORD) {
214  av_log(s, AV_LOG_ERROR, "Failed to read frame record\n");
215  if (ret >= 0)
216  ret = AVERROR_INVALIDDATA;
217  goto error;
218  }
219  type = chunk[0];
220  size = AV_RL32(&chunk[2]);
221  if (size > INT_MAX / 2) {
222  av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
223  ret = AVERROR_INVALIDDATA;
224  goto error;
225  }
226  if(!size && type != 1)
227  continue;
228  switch(type) {
229  case 1: /* Audio Chunk */
230  if (!st) break;
231  /* first audio chunk contains several audio buffers */
232  vmd->frame_table[total_frames].frame_offset = current_offset;
233  vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
234  vmd->frame_table[total_frames].frame_size = size;
235  memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
236  vmd->frame_table[total_frames].pts = current_audio_pts;
237  total_frames++;
238  if(!current_audio_pts)
239  current_audio_pts += sound_buffers - 1;
240  else
241  current_audio_pts++;
242  break;
243  case 2: /* Video Chunk */
244  vmd->frame_table[total_frames].frame_offset = current_offset;
245  vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
246  vmd->frame_table[total_frames].frame_size = size;
247  memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
248  vmd->frame_table[total_frames].pts = i;
249  total_frames++;
250  break;
251  }
252  current_offset += size;
253  }
254  }
255 
256  av_free(raw_frame_table);
257 
258  vmd->current_frame = 0;
259  vmd->frame_count = total_frames;
260 
261  return 0;
262 
263 error:
264  av_freep(&raw_frame_table);
265  av_freep(&vmd->frame_table);
266  return ret;
267 }
268 
270  AVPacket *pkt)
271 {
272  VmdDemuxContext *vmd = s->priv_data;
273  AVIOContext *pb = s->pb;
274  int ret = 0;
275  vmd_frame *frame;
276 
277  if (vmd->current_frame >= vmd->frame_count)
278  return AVERROR_EOF;
279 
280  frame = &vmd->frame_table[vmd->current_frame];
281  /* position the stream (will probably be there already) */
282  avio_seek(pb, frame->frame_offset, SEEK_SET);
283 
284  if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
285  return AVERROR(EIO);
287  return AVERROR(ENOMEM);
288  pkt->pos= avio_tell(pb);
289  memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
290  if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
291  ret = avio_read(pb, pkt->data, frame->frame_size);
292  else
293  ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
294  frame->frame_size);
295 
296  if (ret != frame->frame_size) {
297  av_packet_unref(pkt);
298  ret = AVERROR(EIO);
299  }
300  pkt->stream_index = frame->stream_index;
301  pkt->pts = frame->pts;
302  av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
303  (frame->frame_record[0] == 0x02) ? "video" : "audio",
305  pkt->pts);
306 
307  vmd->current_frame++;
308 
309  return ret;
310 }
311 
313 {
314  VmdDemuxContext *vmd = s->priv_data;
315 
316  av_freep(&vmd->frame_table);
317 
318  return 0;
319 }
320 
322  .name = "vmd",
323  .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD"),
324  .priv_data_size = sizeof(VmdDemuxContext),
329 };
unsigned int frame_count
Definition: sierravmd.c:52
#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 pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1500
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:4929
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
int index
stream index in AVFormatContext
Definition: avformat.h:882
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
GLint GLenum type
Definition: opengl_enc.c:104
int64_t audio_sample_counter
Definition: sierravmd.c:59
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
unsigned int frames_per_block
Definition: sierravmd.c:53
unsigned int current_frame
Definition: sierravmd.c:55
Format I/O context.
Definition: avformat.h:1358
static int vmd_read_close(AVFormatContext *s)
Definition: sierravmd.c:312
int audio_stream_index
Definition: sierravmd.c:50
int ffio_limit(AVIOContext *s, int size)
Definition: utils.c:247
int keyframe
Definition: sierravmd.c:44
#define av_malloc(s)
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4502
int stream_index
Definition: sierravmd.c:40
#define height
uint8_t * data
Definition: avcodec.h:1480
static int vmd_probe(const AVProbeData *p)
Definition: sierravmd.c:65
#define AVERROR_EOF
End of file.
Definition: error.h:55
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
ptrdiff_t size
Definition: opengl_enc.c:100
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
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
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
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3997
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 i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
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
int block_align
Audio only.
Definition: avcodec.h:4085
audio channel layout utility functions
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:3321
#define width
AVInputFormat ff_vmd_demuxer
Definition: sierravmd.c:321
uint8_t w
Definition: llviddspenc.c:38
#define BYTES_PER_FRAME_RECORD
Definition: sierravmd.c:37
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
#define s(width, name)
Definition: cbs_vp9.c:257
static void error(const char *err)
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
static int vmd_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: sierravmd.c:269
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int video_stream_index
Definition: sierravmd.c:49
sample_rate
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
vmd_frame * frame_table
Definition: sierravmd.c:54
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
static int vmd_read_header(AVFormatContext *s)
Definition: sierravmd.c:85
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:456
int64_t pts
Definition: sierravmd.c:43
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
unsigned char vmd_header[VMD_HEADER_SIZE]
Definition: sierravmd.c:62
int64_t frame_offset
Definition: sierravmd.c:41
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int sample_rate
Audio only.
Definition: avcodec.h:4078
Main libavformat public API header.
unsigned char frame_record[BYTES_PER_FRAME_RECORD]
Definition: sierravmd.c:45
#define av_free(p)
void * priv_data
Format private data.
Definition: avformat.h:1386
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4010
int channels
Audio only.
Definition: avcodec.h:4074
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
unsigned int frame_size
Definition: sierravmd.c:42
#define VMD_HEADER_SIZE
Definition: sierravmd.c:36
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
#define av_malloc_array(a, b)
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
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1457
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1473