changing AVCodecContext codec -> *codec in AVStream so additions to AVCodecContext...
[libav.git] / libavformat / ipmovie.c
CommitLineData
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1/*
2 * Interplay MVE File Demuxer
3 * Copyright (c) 2003 The ffmpeg Project
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20/**
21 * @file ipmovie.c
22 * Interplay MVE file demuxer
23 * by Mike Melanson (melanson@pcisys.net)
24 * For more information regarding the Interplay MVE file format, visit:
25 * http://www.pcisys.net/~melanson/codecs/
26 * The aforementioned site also contains a command line utility for parsing
27 * IP MVE files so that you can get a good idea of the typical structure of
28 * such files. This demuxer is not the best example to use if you are trying
29 * to write your own as it uses a rather roundabout approach for splitting
30 * up and sending out the chunks.
31 */
32
33#include "avformat.h"
34
35/* debugging support: #define DEBUG_IPMOVIE as non-zero to see extremely
36 * verbose information about the demux process */
9be653d0 37#define DEBUG_IPMOVIE 0
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38
39#if DEBUG_IPMOVIE
40#define debug_ipmovie printf
41#else
42static inline void debug_ipmovie(const char *format, ...) { }
43#endif
44
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45#define IPMOVIE_SIGNATURE "Interplay MVE File\x1A\0"
46#define IPMOVIE_SIGNATURE_SIZE 20
47#define CHUNK_PREAMBLE_SIZE 4
48#define OPCODE_PREAMBLE_SIZE 4
49
50#define CHUNK_INIT_AUDIO 0x0000
51#define CHUNK_AUDIO_ONLY 0x0001
52#define CHUNK_INIT_VIDEO 0x0002
53#define CHUNK_VIDEO 0x0003
54#define CHUNK_SHUTDOWN 0x0004
55#define CHUNK_END 0x0005
56/* these last types are used internally */
57#define CHUNK_DONE 0xFFFC
58#define CHUNK_NOMEM 0xFFFD
59#define CHUNK_EOF 0xFFFE
60#define CHUNK_BAD 0xFFFF
61
62#define OPCODE_END_OF_STREAM 0x00
63#define OPCODE_END_OF_CHUNK 0x01
64#define OPCODE_CREATE_TIMER 0x02
65#define OPCODE_INIT_AUDIO_BUFFERS 0x03
66#define OPCODE_START_STOP_AUDIO 0x04
67#define OPCODE_INIT_VIDEO_BUFFERS 0x05
68#define OPCODE_UNKNOWN_06 0x06
69#define OPCODE_SEND_BUFFER 0x07
70#define OPCODE_AUDIO_FRAME 0x08
71#define OPCODE_SILENCE_FRAME 0x09
72#define OPCODE_INIT_VIDEO_MODE 0x0A
73#define OPCODE_CREATE_GRADIENT 0x0B
74#define OPCODE_SET_PALETTE 0x0C
75#define OPCODE_SET_PALETTE_COMPRESSED 0x0D
76#define OPCODE_UNKNOWN_0E 0x0E
77#define OPCODE_SET_DECODING_MAP 0x0F
78#define OPCODE_UNKNOWN_10 0x10
79#define OPCODE_VIDEO_DATA 0x11
80#define OPCODE_UNKNOWN_12 0x12
81#define OPCODE_UNKNOWN_13 0x13
82#define OPCODE_UNKNOWN_14 0x14
83#define OPCODE_UNKNOWN_15 0x15
84
85#define PALETTE_COUNT 256
86
87typedef struct IPMVEContext {
88
89 unsigned char *buf;
90 int buf_size;
91
dda61423 92 float fps;
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93 int frame_pts_inc;
94
95 unsigned int video_width;
96 unsigned int video_height;
97 int64_t video_pts;
98
99 unsigned int audio_bits;
100 unsigned int audio_channels;
101 unsigned int audio_sample_rate;
102 unsigned int audio_type;
103 unsigned int audio_frame_count;
104
105 int video_stream_index;
106 int audio_stream_index;
107
108 offset_t audio_chunk_offset;
109 int audio_chunk_size;
110 offset_t video_chunk_offset;
111 int video_chunk_size;
112 offset_t decode_map_chunk_offset;
113 int decode_map_chunk_size;
114
115 offset_t next_chunk_offset;
116
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117 AVPaletteControl palette_control;
118
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119} IPMVEContext;
120
121static int load_ipmovie_packet(IPMVEContext *s, ByteIOContext *pb,
122 AVPacket *pkt) {
123
124 int chunk_type;
125 int64_t audio_pts = 0;
126
127 if (s->audio_chunk_offset) {
128
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129 /* adjust for PCM audio by skipping chunk header */
130 if (s->audio_type != CODEC_ID_INTERPLAY_DPCM) {
131 s->audio_chunk_offset += 6;
132 s->audio_chunk_size -= 6;
133 }
134
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135 url_fseek(pb, s->audio_chunk_offset, SEEK_SET);
136 s->audio_chunk_offset = 0;
137
138 /* figure out the audio pts */
139 audio_pts = 90000;
140 audio_pts *= s->audio_frame_count;
141 audio_pts /= s->audio_sample_rate;
142
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143 if (s->audio_chunk_size != av_get_packet(pb, pkt, s->audio_chunk_size))
144 return CHUNK_EOF;
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145
146 pkt->stream_index = s->audio_stream_index;
147 pkt->pts = audio_pts;
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148
149 /* audio frame maintenance */
150 if (s->audio_type != CODEC_ID_INTERPLAY_DPCM)
151 s->audio_frame_count +=
152 (s->audio_chunk_size / s->audio_channels / (s->audio_bits / 8));
153 else
154 s->audio_frame_count +=
155 (s->audio_chunk_size - 6) / s->audio_channels;
156
157 debug_ipmovie("sending audio frame with pts %lld (%d audio frames)\n",
158 audio_pts, s->audio_frame_count);
159
160 chunk_type = CHUNK_VIDEO;
161
162 } else if (s->decode_map_chunk_offset) {
163
b76c707a 164 /* send both the decode map and the video data together */
3ef8be2b 165
b76c707a 166 if (av_new_packet(pkt, s->decode_map_chunk_size + s->video_chunk_size))
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167 return CHUNK_NOMEM;
168
2692067a 169 pkt->pos= s->decode_map_chunk_offset;
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170 url_fseek(pb, s->decode_map_chunk_offset, SEEK_SET);
171 s->decode_map_chunk_offset = 0;
172
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173 if (get_buffer(pb, pkt->data, s->decode_map_chunk_size) !=
174 s->decode_map_chunk_size) {
175 av_free_packet(pkt);
176 return CHUNK_EOF;
177 }
178
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179 url_fseek(pb, s->video_chunk_offset, SEEK_SET);
180 s->video_chunk_offset = 0;
181
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182 if (get_buffer(pb, pkt->data + s->decode_map_chunk_size,
183 s->video_chunk_size) != s->video_chunk_size) {
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184 av_free_packet(pkt);
185 return CHUNK_EOF;
186 }
187
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188 pkt->stream_index = s->video_stream_index;
189 pkt->pts = s->video_pts;
190
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191 debug_ipmovie("sending video frame with pts %lld\n",
192 pkt->pts);
193
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194 s->video_pts += s->frame_pts_inc;
195
196 chunk_type = CHUNK_VIDEO;
197
198 } else {
199
200 url_fseek(pb, s->next_chunk_offset, SEEK_SET);
201 chunk_type = CHUNK_DONE;
202
203 }
204
205 return chunk_type;
206}
207
208/* This function loads and processes a single chunk in an IP movie file.
209 * It returns the type of chunk that was processed. */
210static int process_ipmovie_chunk(IPMVEContext *s, ByteIOContext *pb,
211 AVPacket *pkt)
212{
213 unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
214 int chunk_type;
215 int chunk_size;
216 unsigned char opcode_preamble[OPCODE_PREAMBLE_SIZE];
217 unsigned char opcode_type;
218 unsigned char opcode_version;
219 int opcode_size;
220 unsigned char scratch[1024];
b76c707a 221 int i, j;
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222 int first_color, last_color;
223 int audio_flags;
2a2bbcb0 224 unsigned char r, g, b;
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225
226 /* see if there are any pending packets */
227 chunk_type = load_ipmovie_packet(s, pb, pkt);
228 if ((chunk_type == CHUNK_VIDEO) && (chunk_type != CHUNK_DONE))
229 return chunk_type;
230
231 /* read the next chunk, wherever the file happens to be pointing */
232 if (url_feof(pb))
233 return CHUNK_EOF;
234 if (get_buffer(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
235 CHUNK_PREAMBLE_SIZE)
236 return CHUNK_BAD;
237 chunk_size = LE_16(&chunk_preamble[0]);
238 chunk_type = LE_16(&chunk_preamble[2]);
239
240 debug_ipmovie("chunk type 0x%04X, 0x%04X bytes: ", chunk_type, chunk_size);
241
242 switch (chunk_type) {
243
244 case CHUNK_INIT_AUDIO:
245 debug_ipmovie("initialize audio\n");
246 break;
247
248 case CHUNK_AUDIO_ONLY:
249 debug_ipmovie("audio only\n");
250 break;
251
252 case CHUNK_INIT_VIDEO:
253 debug_ipmovie("initialize video\n");
254 break;
255
256 case CHUNK_VIDEO:
257 debug_ipmovie("video (and audio)\n");
258 break;
259
260 case CHUNK_SHUTDOWN:
261 debug_ipmovie("shutdown\n");
262 break;
263
264 case CHUNK_END:
265 debug_ipmovie("end\n");
266 break;
267
268 default:
269 debug_ipmovie("invalid chunk\n");
270 chunk_type = CHUNK_BAD;
271 break;
272
273 }
274
275 while ((chunk_size > 0) && (chunk_type != CHUNK_BAD)) {
276
277 /* read the next chunk, wherever the file happens to be pointing */
278 if (url_feof(pb)) {
279 chunk_type = CHUNK_EOF;
280 break;
281 }
282 if (get_buffer(pb, opcode_preamble, CHUNK_PREAMBLE_SIZE) !=
283 CHUNK_PREAMBLE_SIZE) {
284 chunk_type = CHUNK_BAD;
285 break;
286 }
287
288 opcode_size = LE_16(&opcode_preamble[0]);
289 opcode_type = opcode_preamble[2];
290 opcode_version = opcode_preamble[3];
291
292 chunk_size -= OPCODE_PREAMBLE_SIZE;
293 chunk_size -= opcode_size;
294 if (chunk_size < 0) {
295 debug_ipmovie("chunk_size countdown just went negative\n");
296 chunk_type = CHUNK_BAD;
297 break;
298 }
299
300 debug_ipmovie(" opcode type %02X, version %d, 0x%04X bytes: ",
301 opcode_type, opcode_version, opcode_size);
302 switch (opcode_type) {
303
304 case OPCODE_END_OF_STREAM:
305 debug_ipmovie("end of stream\n");
306 url_fseek(pb, opcode_size, SEEK_CUR);
307 break;
308
309 case OPCODE_END_OF_CHUNK:
310 debug_ipmovie("end of chunk\n");
311 url_fseek(pb, opcode_size, SEEK_CUR);
312 break;
313
314 case OPCODE_CREATE_TIMER:
315 debug_ipmovie("create timer\n");
316 if ((opcode_version > 0) || (opcode_size > 6)) {
317 debug_ipmovie("bad create_timer opcode\n");
318 chunk_type = CHUNK_BAD;
319 break;
320 }
321 if (get_buffer(pb, scratch, opcode_size) !=
322 opcode_size) {
323 chunk_type = CHUNK_BAD;
324 break;
325 }
dda61423 326 s->fps = 1000000.0 / (LE_32(&scratch[0]) * LE_16(&scratch[4]));
3ef8be2b 327 s->frame_pts_inc = 90000 / s->fps;
dda61423 328 debug_ipmovie(" %.2f frames/second (timer div = %d, subdiv = %d)\n",
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329 s->fps, LE_32(&scratch[0]), LE_16(&scratch[4]));
330 break;
331
332 case OPCODE_INIT_AUDIO_BUFFERS:
333 debug_ipmovie("initialize audio buffers\n");
334 if ((opcode_version > 1) || (opcode_size > 10)) {
335 debug_ipmovie("bad init_audio_buffers opcode\n");
336 chunk_type = CHUNK_BAD;
337 break;
338 }
339 if (get_buffer(pb, scratch, opcode_size) !=
340 opcode_size) {
341 chunk_type = CHUNK_BAD;
342 break;
343 }
344 s->audio_sample_rate = LE_16(&scratch[4]);
345 audio_flags = LE_16(&scratch[2]);
346 /* bit 0 of the flags: 0 = mono, 1 = stereo */
347 s->audio_channels = (audio_flags & 1) + 1;
348 /* bit 1 of the flags: 0 = 8 bit, 1 = 16 bit */
349 s->audio_bits = (((audio_flags >> 1) & 1) + 1) * 8;
350 /* bit 2 indicates compressed audio in version 1 opcode */
351 if ((opcode_version == 1) && (audio_flags & 0x4))
352 s->audio_type = CODEC_ID_INTERPLAY_DPCM;
353 else if (s->audio_bits == 16)
354 s->audio_type = CODEC_ID_PCM_S16LE;
355 else
356 s->audio_type = CODEC_ID_PCM_U8;
357 debug_ipmovie("audio: %d bits, %d Hz, %s, %s format\n",
358 s->audio_bits,
359 s->audio_sample_rate,
360 (s->audio_channels == 2) ? "stereo" : "mono",
361 (s->audio_type == CODEC_ID_INTERPLAY_DPCM) ?
362 "Interplay audio" : "PCM");
363 break;
364
365 case OPCODE_START_STOP_AUDIO:
366 debug_ipmovie("start/stop audio\n");
367 url_fseek(pb, opcode_size, SEEK_CUR);
368 break;
369
370 case OPCODE_INIT_VIDEO_BUFFERS:
371 debug_ipmovie("initialize video buffers\n");
372 if ((opcode_version > 2) || (opcode_size > 8)) {
373 debug_ipmovie("bad init_video_buffers opcode\n");
374 chunk_type = CHUNK_BAD;
375 break;
376 }
377 if (get_buffer(pb, scratch, opcode_size) !=
378 opcode_size) {
379 chunk_type = CHUNK_BAD;
380 break;
381 }
382 s->video_width = LE_16(&scratch[0]) * 8;
383 s->video_height = LE_16(&scratch[2]) * 8;
384 debug_ipmovie("video resolution: %d x %d\n",
385 s->video_width, s->video_height);
386 break;
387
388 case OPCODE_UNKNOWN_06:
389 case OPCODE_UNKNOWN_0E:
390 case OPCODE_UNKNOWN_10:
391 case OPCODE_UNKNOWN_12:
392 case OPCODE_UNKNOWN_13:
393 case OPCODE_UNKNOWN_14:
394 case OPCODE_UNKNOWN_15:
395 debug_ipmovie("unknown (but documented) opcode %02X\n", opcode_type);
396 url_fseek(pb, opcode_size, SEEK_CUR);
397 break;
398
399 case OPCODE_SEND_BUFFER:
400 debug_ipmovie("send buffer\n");
401 url_fseek(pb, opcode_size, SEEK_CUR);
402 break;
403
404 case OPCODE_AUDIO_FRAME:
405 debug_ipmovie("audio frame\n");
406
407 /* log position and move on for now */
408 s->audio_chunk_offset = url_ftell(pb);
409 s->audio_chunk_size = opcode_size;
410 url_fseek(pb, opcode_size, SEEK_CUR);
411 break;
412
413 case OPCODE_SILENCE_FRAME:
414 debug_ipmovie("silence frame\n");
415 url_fseek(pb, opcode_size, SEEK_CUR);
416 break;
417
418 case OPCODE_INIT_VIDEO_MODE:
419 debug_ipmovie("initialize video mode\n");
420 url_fseek(pb, opcode_size, SEEK_CUR);
421 break;
422
423 case OPCODE_CREATE_GRADIENT:
424 debug_ipmovie("create gradient\n");
425 url_fseek(pb, opcode_size, SEEK_CUR);
426 break;
427
428 case OPCODE_SET_PALETTE:
429 debug_ipmovie("set palette\n");
430 /* check for the logical maximum palette size
431 * (3 * 256 + 4 bytes) */
432 if (opcode_size > 0x304) {
433 debug_ipmovie("demux_ipmovie: set_palette opcode too large\n");
434 chunk_type = CHUNK_BAD;
435 break;
436 }
437 if (get_buffer(pb, scratch, opcode_size) != opcode_size) {
438 chunk_type = CHUNK_BAD;
439 break;
440 }
441
442 /* load the palette into internal data structure */
443 first_color = LE_16(&scratch[0]);
e692c863 444 last_color = first_color + LE_16(&scratch[2]) - 1;
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445 /* sanity check (since they are 16 bit values) */
446 if ((first_color > 0xFF) || (last_color > 0xFF)) {
447 debug_ipmovie("demux_ipmovie: set_palette indices out of range (%d -> %d)\n",
448 first_color, last_color);
449 chunk_type = CHUNK_BAD;
450 break;
451 }
452 j = 4; /* offset of first palette data */
3ef8be2b 453 for (i = first_color; i <= last_color; i++) {
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454 /* the palette is stored as a 6-bit VGA palette, thus each
455 * component is shifted up to a 8-bit range */
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456 r = scratch[j++] * 4;
457 g = scratch[j++] * 4;
458 b = scratch[j++] * 4;
459 s->palette_control.palette[i] = (r << 16) | (g << 8) | (b);
3ef8be2b 460 }
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461 /* indicate a palette change */
462 s->palette_control.palette_changed = 1;
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463 break;
464
465 case OPCODE_SET_PALETTE_COMPRESSED:
466 debug_ipmovie("set palette compressed\n");
467 url_fseek(pb, opcode_size, SEEK_CUR);
468 break;
469
470 case OPCODE_SET_DECODING_MAP:
471 debug_ipmovie("set decoding map\n");
472
473 /* log position and move on for now */
474 s->decode_map_chunk_offset = url_ftell(pb);
475 s->decode_map_chunk_size = opcode_size;
476 url_fseek(pb, opcode_size, SEEK_CUR);
477 break;
478
479 case OPCODE_VIDEO_DATA:
480 debug_ipmovie("set video data\n");
481
482 /* log position and move on for now */
483 s->video_chunk_offset = url_ftell(pb);
484 s->video_chunk_size = opcode_size;
485 url_fseek(pb, opcode_size, SEEK_CUR);
486 break;
487
488 default:
489 debug_ipmovie("*** unknown opcode type\n");
490 chunk_type = CHUNK_BAD;
491 break;
492
493 }
494 }
495
496 /* make a note of where the stream is sitting */
497 s->next_chunk_offset = url_ftell(pb);
498
499 /* dispatch the first of any pending packets */
500 if ((chunk_type == CHUNK_VIDEO) || (chunk_type == CHUNK_AUDIO_ONLY))
501 chunk_type = load_ipmovie_packet(s, pb, pkt);
502
503 return chunk_type;
504}
505
506static int ipmovie_probe(AVProbeData *p)
507{
508 if (p->buf_size < IPMOVIE_SIGNATURE_SIZE)
509 return 0;
510 if (strncmp(p->buf, IPMOVIE_SIGNATURE, IPMOVIE_SIGNATURE_SIZE) != 0)
511 return 0;
512
513 return AVPROBE_SCORE_MAX;
514}
515
516static int ipmovie_read_header(AVFormatContext *s,
517 AVFormatParameters *ap)
518{
519 IPMVEContext *ipmovie = (IPMVEContext *)s->priv_data;
520 ByteIOContext *pb = &s->pb;
521 AVPacket pkt;
522 AVStream *st;
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523 unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
524 int chunk_type;
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525
526 /* initialize private context members */
527 ipmovie->video_pts = ipmovie->audio_frame_count = 0;
528 ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset =
529 ipmovie->decode_map_chunk_offset = 0;
530
531 /* on the first read, this will position the stream at the first chunk */
532 ipmovie->next_chunk_offset = IPMOVIE_SIGNATURE_SIZE + 6;
533
534 /* process the first chunk which should be CHUNK_INIT_VIDEO */
535 if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO)
536 return AVERROR_INVALIDDATA;
537
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538 /* peek ahead to the next chunk-- if it is an init audio chunk, process
539 * it; if it is the first video chunk, this is a silent file */
540 if (get_buffer(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
541 CHUNK_PREAMBLE_SIZE)
0bd586c5 542 return AVERROR_IO;
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543 chunk_type = LE_16(&chunk_preamble[2]);
544 url_fseek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR);
545
546 if (chunk_type == CHUNK_VIDEO)
547 ipmovie->audio_type = 0; /* no audio */
548 else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO)
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549 return AVERROR_INVALIDDATA;
550
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551 /* initialize the stream decoders */
552 st = av_new_stream(s, 0);
553 if (!st)
554 return AVERROR_NOMEM;
9ee91c2f 555 av_set_pts_info(st, 33, 1, 90000);
3ef8be2b 556 ipmovie->video_stream_index = st->index;
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557 st->codec->codec_type = CODEC_TYPE_VIDEO;
558 st->codec->codec_id = CODEC_ID_INTERPLAY_VIDEO;
559 st->codec->codec_tag = 0; /* no fourcc */
560 st->codec->width = ipmovie->video_width;
561 st->codec->height = ipmovie->video_height;
3ef8be2b 562
b76c707a 563 /* palette considerations */
01f4895c 564 st->codec->palctrl = &ipmovie->palette_control;
b76c707a 565
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566 if (ipmovie->audio_type) {
567 st = av_new_stream(s, 0);
568 if (!st)
569 return AVERROR_NOMEM;
9ee91c2f 570 av_set_pts_info(st, 33, 1, 90000);
dda61423 571 ipmovie->audio_stream_index = st->index;
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572 st->codec->codec_type = CODEC_TYPE_AUDIO;
573 st->codec->codec_id = ipmovie->audio_type;
574 st->codec->codec_tag = 0; /* no tag */
575 st->codec->channels = ipmovie->audio_channels;
576 st->codec->sample_rate = ipmovie->audio_sample_rate;
577 st->codec->bits_per_sample = ipmovie->audio_bits;
578 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
579 st->codec->bits_per_sample;
580 if (st->codec->codec_id == CODEC_ID_INTERPLAY_DPCM)
581 st->codec->bit_rate /= 2;
582 st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
dda61423 583 }
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584
585 return 0;
586}
587
588static int ipmovie_read_packet(AVFormatContext *s,
589 AVPacket *pkt)
590{
591 IPMVEContext *ipmovie = (IPMVEContext *)s->priv_data;
592 ByteIOContext *pb = &s->pb;
593 int ret;
594
595 ret = process_ipmovie_chunk(ipmovie, pb, pkt);
596 if (ret == CHUNK_BAD)
597 ret = AVERROR_INVALIDDATA;
598 else if (ret == CHUNK_EOF)
0bd586c5 599 ret = AVERROR_IO;
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600 else if (ret == CHUNK_NOMEM)
601 ret = AVERROR_NOMEM;
602 else
603 ret = 0;
604
605 return ret;
606}
607
608static int ipmovie_read_close(AVFormatContext *s)
609{
610// IPMVEContext *ipmovie = (IPMVEContext *)s->priv_data;
611
612 return 0;
613}
614
615static AVInputFormat ipmovie_iformat = {
616 "ipmovie",
617 "Interplay MVE format",
618 sizeof(IPMVEContext),
619 ipmovie_probe,
620 ipmovie_read_header,
621 ipmovie_read_packet,
622 ipmovie_read_close,
623};
624
625int ipmovie_init(void)
626{
627 av_register_input_format(&ipmovie_iformat);
628 return 0;
629}
630