VC1: merge idct8x8, coeff adjustments and put_pixels.
[libav.git] / libavformat / ipmovie.c
CommitLineData
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1/*
2 * Interplay MVE File Demuxer
3 * Copyright (c) 2003 The ffmpeg Project
4 *
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
3ef8be2b 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
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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
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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20 */
21
22/**
ba87f080 23 * @file
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24 * Interplay MVE file demuxer
25 * by Mike Melanson (melanson@pcisys.net)
26 * For more information regarding the Interplay MVE file format, visit:
27 * http://www.pcisys.net/~melanson/codecs/
28 * The aforementioned site also contains a command line utility for parsing
29 * IP MVE files so that you can get a good idea of the typical structure of
30 * such files. This demuxer is not the best example to use if you are trying
31 * to write your own as it uses a rather roundabout approach for splitting
32 * up and sending out the chunks.
33 */
34
6a5d31ac 35#include "libavutil/intreadwrite.h"
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36#include "avformat.h"
37
38/* debugging support: #define DEBUG_IPMOVIE as non-zero to see extremely
39 * verbose information about the demux process */
9be653d0 40#define DEBUG_IPMOVIE 0
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41
42#if DEBUG_IPMOVIE
3bc5f6f9 43#undef printf
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44#define debug_ipmovie printf
45#else
46static inline void debug_ipmovie(const char *format, ...) { }
47#endif
48
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49#define CHUNK_PREAMBLE_SIZE 4
50#define OPCODE_PREAMBLE_SIZE 4
51
52#define CHUNK_INIT_AUDIO 0x0000
53#define CHUNK_AUDIO_ONLY 0x0001
54#define CHUNK_INIT_VIDEO 0x0002
55#define CHUNK_VIDEO 0x0003
56#define CHUNK_SHUTDOWN 0x0004
57#define CHUNK_END 0x0005
58/* these last types are used internally */
59#define CHUNK_DONE 0xFFFC
60#define CHUNK_NOMEM 0xFFFD
61#define CHUNK_EOF 0xFFFE
62#define CHUNK_BAD 0xFFFF
63
64#define OPCODE_END_OF_STREAM 0x00
65#define OPCODE_END_OF_CHUNK 0x01
66#define OPCODE_CREATE_TIMER 0x02
67#define OPCODE_INIT_AUDIO_BUFFERS 0x03
68#define OPCODE_START_STOP_AUDIO 0x04
69#define OPCODE_INIT_VIDEO_BUFFERS 0x05
70#define OPCODE_UNKNOWN_06 0x06
71#define OPCODE_SEND_BUFFER 0x07
72#define OPCODE_AUDIO_FRAME 0x08
73#define OPCODE_SILENCE_FRAME 0x09
74#define OPCODE_INIT_VIDEO_MODE 0x0A
75#define OPCODE_CREATE_GRADIENT 0x0B
76#define OPCODE_SET_PALETTE 0x0C
77#define OPCODE_SET_PALETTE_COMPRESSED 0x0D
78#define OPCODE_UNKNOWN_0E 0x0E
79#define OPCODE_SET_DECODING_MAP 0x0F
80#define OPCODE_UNKNOWN_10 0x10
81#define OPCODE_VIDEO_DATA 0x11
82#define OPCODE_UNKNOWN_12 0x12
83#define OPCODE_UNKNOWN_13 0x13
84#define OPCODE_UNKNOWN_14 0x14
85#define OPCODE_UNKNOWN_15 0x15
86
87#define PALETTE_COUNT 256
88
89typedef struct IPMVEContext {
90
91 unsigned char *buf;
92 int buf_size;
93
03c03afd 94 uint64_t frame_pts_inc;
3ef8be2b 95
8badb23e 96 unsigned int video_bpp;
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97 unsigned int video_width;
98 unsigned int video_height;
99 int64_t video_pts;
100
101 unsigned int audio_bits;
102 unsigned int audio_channels;
103 unsigned int audio_sample_rate;
1c53290b 104 enum CodecID audio_type;
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105 unsigned int audio_frame_count;
106
107 int video_stream_index;
108 int audio_stream_index;
109
bc5c918e 110 int64_t audio_chunk_offset;
3ef8be2b 111 int audio_chunk_size;
bc5c918e 112 int64_t video_chunk_offset;
3ef8be2b 113 int video_chunk_size;
bc5c918e 114 int64_t decode_map_chunk_offset;
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115 int decode_map_chunk_size;
116
bc5c918e 117 int64_t next_chunk_offset;
3ef8be2b 118
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119 AVPaletteControl palette_control;
120
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121} IPMVEContext;
122
ae628ec1 123static int load_ipmovie_packet(IPMVEContext *s, AVIOContext *pb,
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124 AVPacket *pkt) {
125
126 int chunk_type;
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127
128 if (s->audio_chunk_offset) {
129
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130 /* adjust for PCM audio by skipping chunk header */
131 if (s->audio_type != CODEC_ID_INTERPLAY_DPCM) {
132 s->audio_chunk_offset += 6;
133 s->audio_chunk_size -= 6;
134 }
135
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136 url_fseek(pb, s->audio_chunk_offset, SEEK_SET);
137 s->audio_chunk_offset = 0;
138
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139 if (s->audio_chunk_size != av_get_packet(pb, pkt, s->audio_chunk_size))
140 return CHUNK_EOF;
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141
142 pkt->stream_index = s->audio_stream_index;
03c03afd 143 pkt->pts = s->audio_frame_count;
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144
145 /* audio frame maintenance */
146 if (s->audio_type != CODEC_ID_INTERPLAY_DPCM)
147 s->audio_frame_count +=
148 (s->audio_chunk_size / s->audio_channels / (s->audio_bits / 8));
149 else
150 s->audio_frame_count +=
151 (s->audio_chunk_size - 6) / s->audio_channels;
152
949b1a13 153 debug_ipmovie("sending audio frame with pts %"PRId64" (%d audio frames)\n",
03c03afd 154 pkt->pts, s->audio_frame_count);
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155
156 chunk_type = CHUNK_VIDEO;
157
158 } else if (s->decode_map_chunk_offset) {
159
b76c707a 160 /* send both the decode map and the video data together */
3ef8be2b 161
b76c707a 162 if (av_new_packet(pkt, s->decode_map_chunk_size + s->video_chunk_size))
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163 return CHUNK_NOMEM;
164
2692067a 165 pkt->pos= s->decode_map_chunk_offset;
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166 url_fseek(pb, s->decode_map_chunk_offset, SEEK_SET);
167 s->decode_map_chunk_offset = 0;
168
115329f1 169 if (get_buffer(pb, pkt->data, s->decode_map_chunk_size) !=
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170 s->decode_map_chunk_size) {
171 av_free_packet(pkt);
172 return CHUNK_EOF;
173 }
174
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175 url_fseek(pb, s->video_chunk_offset, SEEK_SET);
176 s->video_chunk_offset = 0;
177
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178 if (get_buffer(pb, pkt->data + s->decode_map_chunk_size,
179 s->video_chunk_size) != s->video_chunk_size) {
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180 av_free_packet(pkt);
181 return CHUNK_EOF;
182 }
183
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184 pkt->stream_index = s->video_stream_index;
185 pkt->pts = s->video_pts;
186
949b1a13 187 debug_ipmovie("sending video frame with pts %"PRId64"\n",
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188 pkt->pts);
189
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190 s->video_pts += s->frame_pts_inc;
191
192 chunk_type = CHUNK_VIDEO;
193
194 } else {
195
196 url_fseek(pb, s->next_chunk_offset, SEEK_SET);
197 chunk_type = CHUNK_DONE;
198
199 }
200
201 return chunk_type;
202}
203
204/* This function loads and processes a single chunk in an IP movie file.
205 * It returns the type of chunk that was processed. */
ae628ec1 206static int process_ipmovie_chunk(IPMVEContext *s, AVIOContext *pb,
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207 AVPacket *pkt)
208{
209 unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
210 int chunk_type;
211 int chunk_size;
212 unsigned char opcode_preamble[OPCODE_PREAMBLE_SIZE];
213 unsigned char opcode_type;
214 unsigned char opcode_version;
215 int opcode_size;
216 unsigned char scratch[1024];
b76c707a 217 int i, j;
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218 int first_color, last_color;
219 int audio_flags;
2a2bbcb0 220 unsigned char r, g, b;
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221
222 /* see if there are any pending packets */
223 chunk_type = load_ipmovie_packet(s, pb, pkt);
49c8132b 224 if (chunk_type != CHUNK_DONE)
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225 return chunk_type;
226
227 /* read the next chunk, wherever the file happens to be pointing */
228 if (url_feof(pb))
229 return CHUNK_EOF;
230 if (get_buffer(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
231 CHUNK_PREAMBLE_SIZE)
232 return CHUNK_BAD;
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233 chunk_size = AV_RL16(&chunk_preamble[0]);
234 chunk_type = AV_RL16(&chunk_preamble[2]);
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235
236 debug_ipmovie("chunk type 0x%04X, 0x%04X bytes: ", chunk_type, chunk_size);
237
238 switch (chunk_type) {
239
240 case CHUNK_INIT_AUDIO:
241 debug_ipmovie("initialize audio\n");
242 break;
243
244 case CHUNK_AUDIO_ONLY:
245 debug_ipmovie("audio only\n");
246 break;
247
248 case CHUNK_INIT_VIDEO:
249 debug_ipmovie("initialize video\n");
250 break;
251
252 case CHUNK_VIDEO:
253 debug_ipmovie("video (and audio)\n");
254 break;
255
256 case CHUNK_SHUTDOWN:
257 debug_ipmovie("shutdown\n");
258 break;
259
260 case CHUNK_END:
261 debug_ipmovie("end\n");
262 break;
263
264 default:
265 debug_ipmovie("invalid chunk\n");
266 chunk_type = CHUNK_BAD;
267 break;
268
269 }
270
271 while ((chunk_size > 0) && (chunk_type != CHUNK_BAD)) {
272
273 /* read the next chunk, wherever the file happens to be pointing */
0f46d685 274 if (url_feof(pb)) {
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275 chunk_type = CHUNK_EOF;
276 break;
277 }
278 if (get_buffer(pb, opcode_preamble, CHUNK_PREAMBLE_SIZE) !=
279 CHUNK_PREAMBLE_SIZE) {
280 chunk_type = CHUNK_BAD;
281 break;
282 }
283
fead30d4 284 opcode_size = AV_RL16(&opcode_preamble[0]);
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285 opcode_type = opcode_preamble[2];
286 opcode_version = opcode_preamble[3];
287
288 chunk_size -= OPCODE_PREAMBLE_SIZE;
289 chunk_size -= opcode_size;
290 if (chunk_size < 0) {
291 debug_ipmovie("chunk_size countdown just went negative\n");
292 chunk_type = CHUNK_BAD;
293 break;
294 }
295
296 debug_ipmovie(" opcode type %02X, version %d, 0x%04X bytes: ",
297 opcode_type, opcode_version, opcode_size);
298 switch (opcode_type) {
299
300 case OPCODE_END_OF_STREAM:
301 debug_ipmovie("end of stream\n");
302 url_fseek(pb, opcode_size, SEEK_CUR);
303 break;
304
305 case OPCODE_END_OF_CHUNK:
306 debug_ipmovie("end of chunk\n");
307 url_fseek(pb, opcode_size, SEEK_CUR);
308 break;
309
310 case OPCODE_CREATE_TIMER:
311 debug_ipmovie("create timer\n");
312 if ((opcode_version > 0) || (opcode_size > 6)) {
313 debug_ipmovie("bad create_timer opcode\n");
314 chunk_type = CHUNK_BAD;
315 break;
316 }
317 if (get_buffer(pb, scratch, opcode_size) !=
318 opcode_size) {
319 chunk_type = CHUNK_BAD;
320 break;
321 }
03c03afd 322 s->frame_pts_inc = ((uint64_t)AV_RL32(&scratch[0])) * AV_RL16(&scratch[4]);
dda61423 323 debug_ipmovie(" %.2f frames/second (timer div = %d, subdiv = %d)\n",
03c03afd 324 1000000.0/s->frame_pts_inc, AV_RL32(&scratch[0]), AV_RL16(&scratch[4]));
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325 break;
326
327 case OPCODE_INIT_AUDIO_BUFFERS:
328 debug_ipmovie("initialize audio buffers\n");
329 if ((opcode_version > 1) || (opcode_size > 10)) {
330 debug_ipmovie("bad init_audio_buffers opcode\n");
331 chunk_type = CHUNK_BAD;
332 break;
333 }
334 if (get_buffer(pb, scratch, opcode_size) !=
335 opcode_size) {
336 chunk_type = CHUNK_BAD;
337 break;
338 }
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339 s->audio_sample_rate = AV_RL16(&scratch[4]);
340 audio_flags = AV_RL16(&scratch[2]);
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341 /* bit 0 of the flags: 0 = mono, 1 = stereo */
342 s->audio_channels = (audio_flags & 1) + 1;
343 /* bit 1 of the flags: 0 = 8 bit, 1 = 16 bit */
344 s->audio_bits = (((audio_flags >> 1) & 1) + 1) * 8;
345 /* bit 2 indicates compressed audio in version 1 opcode */
346 if ((opcode_version == 1) && (audio_flags & 0x4))
347 s->audio_type = CODEC_ID_INTERPLAY_DPCM;
348 else if (s->audio_bits == 16)
349 s->audio_type = CODEC_ID_PCM_S16LE;
350 else
351 s->audio_type = CODEC_ID_PCM_U8;
352 debug_ipmovie("audio: %d bits, %d Hz, %s, %s format\n",
353 s->audio_bits,
354 s->audio_sample_rate,
355 (s->audio_channels == 2) ? "stereo" : "mono",
115329f1 356 (s->audio_type == CODEC_ID_INTERPLAY_DPCM) ?
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357 "Interplay audio" : "PCM");
358 break;
359
360 case OPCODE_START_STOP_AUDIO:
361 debug_ipmovie("start/stop audio\n");
362 url_fseek(pb, opcode_size, SEEK_CUR);
363 break;
364
365 case OPCODE_INIT_VIDEO_BUFFERS:
366 debug_ipmovie("initialize video buffers\n");
367 if ((opcode_version > 2) || (opcode_size > 8)) {
368 debug_ipmovie("bad init_video_buffers opcode\n");
369 chunk_type = CHUNK_BAD;
370 break;
371 }
372 if (get_buffer(pb, scratch, opcode_size) !=
373 opcode_size) {
374 chunk_type = CHUNK_BAD;
375 break;
376 }
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377 s->video_width = AV_RL16(&scratch[0]) * 8;
378 s->video_height = AV_RL16(&scratch[2]) * 8;
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379 if (opcode_version < 2 || !AV_RL16(&scratch[6])) {
380 s->video_bpp = 8;
381 } else {
382 s->video_bpp = 16;
383 }
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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 */
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443 first_color = AV_RL16(&scratch[0]);
444 last_color = first_color + AV_RL16(&scratch[2]) - 1;
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445 /* sanity check (since they are 16 bit values) */
446 if ((first_color > 0xFF) || (last_color > 0xFF)) {
f4433de9 447 debug_ipmovie("demux_ipmovie: set_palette indexes out of range (%d -> %d)\n",
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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
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506static const char signature[] = "Interplay MVE File\x1A\0\x1A";
507
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508static int ipmovie_probe(AVProbeData *p)
509{
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510 uint8_t *b = p->buf;
511 uint8_t *b_end = p->buf + p->buf_size - sizeof(signature);
512 do {
513 if (memcmp(b++, signature, sizeof(signature)) == 0)
514 return AVPROBE_SCORE_MAX;
515 } while (b < b_end);
516
517 return 0;
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518}
519
520static int ipmovie_read_header(AVFormatContext *s,
521 AVFormatParameters *ap)
522{
e4141433 523 IPMVEContext *ipmovie = s->priv_data;
ae628ec1 524 AVIOContext *pb = s->pb;
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525 AVPacket pkt;
526 AVStream *st;
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527 unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
528 int chunk_type;
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529 uint8_t signature_buffer[sizeof(signature)];
530
531 get_buffer(pb, signature_buffer, sizeof(signature_buffer));
532 while (memcmp(signature_buffer, signature, sizeof(signature))) {
533 memmove(signature_buffer, signature_buffer + 1, sizeof(signature_buffer) - 1);
534 signature_buffer[sizeof(signature_buffer) - 1] = get_byte(pb);
535 if (url_feof(pb))
536 return AVERROR_EOF;
537 }
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MM
538 /* initialize private context members */
539 ipmovie->video_pts = ipmovie->audio_frame_count = 0;
540 ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset =
541 ipmovie->decode_map_chunk_offset = 0;
542
543 /* on the first read, this will position the stream at the first chunk */
61e8efd3 544 ipmovie->next_chunk_offset = url_ftell(pb) + 4;
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MM
545
546 /* process the first chunk which should be CHUNK_INIT_VIDEO */
547 if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO)
548 return AVERROR_INVALIDDATA;
549
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550 /* peek ahead to the next chunk-- if it is an init audio chunk, process
551 * it; if it is the first video chunk, this is a silent file */
552 if (get_buffer(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
553 CHUNK_PREAMBLE_SIZE)
6f3e0b21 554 return AVERROR(EIO);
fead30d4 555 chunk_type = AV_RL16(&chunk_preamble[2]);
dda61423
MM
556 url_fseek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR);
557
558 if (chunk_type == CHUNK_VIDEO)
1c53290b 559 ipmovie->audio_type = CODEC_ID_NONE; /* no audio */
dda61423 560 else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO)
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561 return AVERROR_INVALIDDATA;
562
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563 /* initialize the stream decoders */
564 st = av_new_stream(s, 0);
565 if (!st)
769e10f0 566 return AVERROR(ENOMEM);
03c03afd 567 av_set_pts_info(st, 63, 1, 1000000);
3ef8be2b 568 ipmovie->video_stream_index = st->index;
72415b2a 569 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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570 st->codec->codec_id = CODEC_ID_INTERPLAY_VIDEO;
571 st->codec->codec_tag = 0; /* no fourcc */
572 st->codec->width = ipmovie->video_width;
573 st->codec->height = ipmovie->video_height;
8badb23e 574 st->codec->bits_per_coded_sample = ipmovie->video_bpp;
3ef8be2b 575
b76c707a 576 /* palette considerations */
01f4895c 577 st->codec->palctrl = &ipmovie->palette_control;
b76c707a 578
dda61423
MM
579 if (ipmovie->audio_type) {
580 st = av_new_stream(s, 0);
581 if (!st)
769e10f0 582 return AVERROR(ENOMEM);
03c03afd 583 av_set_pts_info(st, 32, 1, ipmovie->audio_sample_rate);
dda61423 584 ipmovie->audio_stream_index = st->index;
72415b2a 585 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
01f4895c
MN
586 st->codec->codec_id = ipmovie->audio_type;
587 st->codec->codec_tag = 0; /* no tag */
588 st->codec->channels = ipmovie->audio_channels;
589 st->codec->sample_rate = ipmovie->audio_sample_rate;
dd1c8f3e 590 st->codec->bits_per_coded_sample = ipmovie->audio_bits;
01f4895c 591 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
dd1c8f3e 592 st->codec->bits_per_coded_sample;
01f4895c
MN
593 if (st->codec->codec_id == CODEC_ID_INTERPLAY_DPCM)
594 st->codec->bit_rate /= 2;
dd1c8f3e 595 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
dda61423 596 }
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597
598 return 0;
599}
600
601static int ipmovie_read_packet(AVFormatContext *s,
602 AVPacket *pkt)
603{
e4141433 604 IPMVEContext *ipmovie = s->priv_data;
ae628ec1 605 AVIOContext *pb = s->pb;
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606 int ret;
607
608 ret = process_ipmovie_chunk(ipmovie, pb, pkt);
609 if (ret == CHUNK_BAD)
610 ret = AVERROR_INVALIDDATA;
611 else if (ret == CHUNK_EOF)
6f3e0b21 612 ret = AVERROR(EIO);
3ef8be2b 613 else if (ret == CHUNK_NOMEM)
769e10f0 614 ret = AVERROR(ENOMEM);
49c8132b 615 else if (ret == CHUNK_VIDEO)
3ef8be2b 616 ret = 0;
49c8132b
MN
617 else
618 ret = -1;
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619
620 return ret;
621}
622
c6610a21 623AVInputFormat ff_ipmovie_demuxer = {
3ef8be2b 624 "ipmovie",
bde15e74 625 NULL_IF_CONFIG_SMALL("Interplay MVE format"),
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MM
626 sizeof(IPMVEContext),
627 ipmovie_probe,
628 ipmovie_read_header,
629 ipmovie_read_packet,
3ef8be2b 630};