2 * Cinepak Video Decoder
3 * Copyright (C) 2003 The FFmpeg project
5 * This file is part of FFmpeg.
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.
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.
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
24 * Cinepak video decoder
25 * @author Ewald Snel <ewald@rambo.its.tudelft.nl>
27 * @see For more information on the Cinepak algorithm, visit:
28 * http://www.csse.monash.edu.au/~timf/
29 * @see For more information on the quirky data inside Sega FILM/CPK files, visit:
30 * http://wiki.multimedia.cx/index.php?title=Sega_FILM
32 * Cinepak colorspace support (c) 2013 Rl, Aetey Global Technologies AB
33 * @author Cinepak colorspace, Rl, Aetey Global Technologies AB
40 #include "libavutil/common.h"
41 #include "libavutil/intreadwrite.h"
46 typedef uint8_t cvid_codebook[12];
50 typedef struct cvid_strip {
54 cvid_codebook v4_codebook[256];
55 cvid_codebook v1_codebook[256];
58 typedef struct CinepakContext {
60 AVCodecContext *avctx;
63 const unsigned char *data;
69 cvid_strip strips[MAX_STRIPS];
71 int sega_film_skip_bytes;
76 static void cinepak_decode_codebook (cvid_codebook *codebook,
77 int chunk_id, int size, const uint8_t *data)
79 const uint8_t *eod = (data + size);
84 /* check if this chunk contains 4- or 6-element vectors */
85 n = (chunk_id & 0x04) ? 4 : 6;
90 for (i=0; i < 256; i++) {
91 if ((chunk_id & 0x01) && !(mask >>= 1)) {
95 flag = AV_RB32 (data);
100 if (!(chunk_id & 0x01) || (flag & mask)) {
103 if ((data + n) > eod)
106 for (k = 0; k < 4; ++k) {
108 for (kk = 0; kk < 3; ++kk)
113 u = *(int8_t *)data++;
114 v = *(int8_t *)data++;
118 g = *p++ - (u/2) - v;
121 *p++ = av_clip_uint8(r);
122 *p++ = av_clip_uint8(g);
123 *p++ = av_clip_uint8(b);
132 static int cinepak_decode_vectors (CinepakContext *s, cvid_strip *strip,
133 int chunk_id, int size, const uint8_t *data)
135 const uint8_t *eod = (data + size);
137 uint8_t *cb0, *cb1, *cb2, *cb3;
139 char *ip0, *ip1, *ip2, *ip3;
144 for (y=strip->y1; y < strip->y2; y+=4) {
146 /* take care of y dimension not being multiple of 4, such streams exist */
147 ip0 = ip1 = ip2 = ip3 = s->frame->data[0] +
148 (s->palette_video?strip->x1:strip->x1*3) + (y * s->frame->linesize[0]);
149 if(s->avctx->height - y > 1) {
150 ip1 = ip0 + s->frame->linesize[0];
151 if(s->avctx->height - y > 2) {
152 ip2 = ip1 + s->frame->linesize[0];
153 if(s->avctx->height - y > 3) {
154 ip3 = ip2 + s->frame->linesize[0];
158 /* to get the correct picture for not-multiple-of-4 cases let us fill each
159 * block from the bottom up, thus possibly overwriting the bottommost line
160 * more than once but ending with the correct data in place
161 * (instead of in-loop checking) */
163 for (x=strip->x1; x < strip->x2; x+=4) {
164 if ((chunk_id & 0x01) && !(mask >>= 1)) {
165 if ((data + 4) > eod)
166 return AVERROR_INVALIDDATA;
168 flag = AV_RB32 (data);
173 if (!(chunk_id & 0x01) || (flag & mask)) {
174 if (!(chunk_id & 0x02) && !(mask >>= 1)) {
175 if ((data + 4) > eod)
176 return AVERROR_INVALIDDATA;
178 flag = AV_RB32 (data);
183 if ((chunk_id & 0x02) || (~flag & mask)) {
186 return AVERROR_INVALIDDATA;
188 p = strip->v1_codebook[*data++];
189 if (s->palette_video) {
190 ip3[0] = ip3[1] = ip2[0] = ip2[1] = p[6];
191 ip3[2] = ip3[3] = ip2[2] = ip2[3] = p[9];
192 ip1[0] = ip1[1] = ip0[0] = ip0[1] = p[0];
193 ip1[2] = ip1[3] = ip0[2] = ip0[3] = p[3];
196 memcpy(ip3 + 0, p, 3); memcpy(ip3 + 3, p, 3);
197 memcpy(ip2 + 0, p, 3); memcpy(ip2 + 3, p, 3);
198 p += 3; /* ... + 9 */
199 memcpy(ip3 + 6, p, 3); memcpy(ip3 + 9, p, 3);
200 memcpy(ip2 + 6, p, 3); memcpy(ip2 + 9, p, 3);
201 p -= 9; /* ... + 0 */
202 memcpy(ip1 + 0, p, 3); memcpy(ip1 + 3, p, 3);
203 memcpy(ip0 + 0, p, 3); memcpy(ip0 + 3, p, 3);
204 p += 3; /* ... + 3 */
205 memcpy(ip1 + 6, p, 3); memcpy(ip1 + 9, p, 3);
206 memcpy(ip0 + 6, p, 3); memcpy(ip0 + 9, p, 3);
209 } else if (flag & mask) {
210 if ((data + 4) > eod)
211 return AVERROR_INVALIDDATA;
213 cb0 = strip->v4_codebook[*data++];
214 cb1 = strip->v4_codebook[*data++];
215 cb2 = strip->v4_codebook[*data++];
216 cb3 = strip->v4_codebook[*data++];
217 if (s->palette_video) {
240 memcpy(ip3 + 0, cb2 + 6, 6);
241 memcpy(ip3 + 6, cb3 + 6, 6);
242 memcpy(ip2 + 0, cb2 + 0, 6);
243 memcpy(ip2 + 6, cb3 + 0, 6);
244 memcpy(ip1 + 0, cb0 + 6, 6);
245 memcpy(ip1 + 6, cb1 + 6, 6);
246 memcpy(ip0 + 0, cb0 + 0, 6);
247 memcpy(ip0 + 6, cb1 + 0, 6);
253 if (s->palette_video) {
257 ip0 += 12; ip1 += 12;
258 ip2 += 12; ip3 += 12;
266 static int cinepak_decode_strip (CinepakContext *s,
267 cvid_strip *strip, const uint8_t *data, int size)
269 const uint8_t *eod = (data + size);
270 int chunk_id, chunk_size;
272 /* coordinate sanity checks */
273 if (strip->x2 > s->width ||
274 strip->y2 > s->height ||
275 strip->x1 >= strip->x2 || strip->y1 >= strip->y2)
276 return AVERROR_INVALIDDATA;
278 while ((data + 4) <= eod) {
280 chunk_size = AV_RB24 (&data[1]) - 4;
282 return AVERROR_INVALIDDATA;
285 chunk_size = ((data + chunk_size) > eod) ? (eod - data) : chunk_size;
293 cinepak_decode_codebook (strip->v4_codebook, chunk_id,
301 cinepak_decode_codebook (strip->v1_codebook, chunk_id,
308 return cinepak_decode_vectors (s, strip, chunk_id,
315 return AVERROR_INVALIDDATA;
318 static int cinepak_predecode_check (CinepakContext *s)
321 int encoded_buf_size;
323 num_strips = AV_RB16 (&s->data[8]);
324 encoded_buf_size = AV_RB24(&s->data[1]);
326 /* if this is the first frame, check for deviant Sega FILM data */
327 if (s->sega_film_skip_bytes == -1) {
328 if (!encoded_buf_size) {
329 avpriv_request_sample(s->avctx, "encoded_buf_size 0");
330 return AVERROR_PATCHWELCOME;
332 if (encoded_buf_size != s->size && (s->size % encoded_buf_size) != 0) {
333 /* If the encoded frame size differs from the frame size as indicated
334 * by the container file, this data likely comes from a Sega FILM/CPK file.
335 * If the frame header is followed by the bytes FE 00 00 06 00 00 then
336 * this is probably one of the two known files that have 6 extra bytes
337 * after the frame header. Else, assume 2 extra bytes. The container
338 * size also cannot be a multiple of the encoded size. */
340 (s->data[10] == 0xFE) &&
341 (s->data[11] == 0x00) &&
342 (s->data[12] == 0x00) &&
343 (s->data[13] == 0x06) &&
344 (s->data[14] == 0x00) &&
345 (s->data[15] == 0x00))
346 s->sega_film_skip_bytes = 6;
348 s->sega_film_skip_bytes = 2;
350 s->sega_film_skip_bytes = 0;
353 if (s->size < 10 + s->sega_film_skip_bytes + num_strips * 12)
354 return AVERROR_INVALIDDATA;
359 static int cinepak_decode (CinepakContext *s)
361 const uint8_t *eod = (s->data + s->size);
362 int i, result, strip_size, frame_flags, num_strips;
365 frame_flags = s->data[0];
366 num_strips = AV_RB16 (&s->data[8]);
368 s->data += 10 + s->sega_film_skip_bytes;
370 num_strips = FFMIN(num_strips, MAX_STRIPS);
372 s->frame->key_frame = 0;
374 for (i=0; i < num_strips; i++) {
375 if ((s->data + 12) > eod)
376 return AVERROR_INVALIDDATA;
378 s->strips[i].id = s->data[0];
379 /* zero y1 means "relative to the previous stripe" */
380 if (!(s->strips[i].y1 = AV_RB16 (&s->data[4])))
381 s->strips[i].y2 = (s->strips[i].y1 = y0) + AV_RB16 (&s->data[8]);
383 s->strips[i].y2 = AV_RB16 (&s->data[8]);
384 s->strips[i].x1 = AV_RB16 (&s->data[6]);
385 s->strips[i].x2 = AV_RB16 (&s->data[10]);
387 if (s->strips[i].id == 0x10)
388 s->frame->key_frame = 1;
390 strip_size = AV_RB24 (&s->data[1]) - 12;
392 return AVERROR_INVALIDDATA;
394 strip_size = ((s->data + strip_size) > eod) ? (eod - s->data) : strip_size;
396 if ((i > 0) && !(frame_flags & 0x01)) {
397 memcpy (s->strips[i].v4_codebook, s->strips[i-1].v4_codebook,
398 sizeof(s->strips[i].v4_codebook));
399 memcpy (s->strips[i].v1_codebook, s->strips[i-1].v1_codebook,
400 sizeof(s->strips[i].v1_codebook));
403 result = cinepak_decode_strip (s, &s->strips[i], s->data, strip_size);
408 s->data += strip_size;
409 y0 = s->strips[i].y2;
414 static av_cold int cinepak_decode_init(AVCodecContext *avctx)
416 CinepakContext *s = avctx->priv_data;
419 s->width = (avctx->width + 3) & ~3;
420 s->height = (avctx->height + 3) & ~3;
422 s->sega_film_skip_bytes = -1; /* uninitialized state */
424 // check for paletted data
425 if (avctx->bits_per_coded_sample != 8) {
426 s->palette_video = 0;
427 avctx->pix_fmt = AV_PIX_FMT_RGB24;
429 s->palette_video = 1;
430 avctx->pix_fmt = AV_PIX_FMT_PAL8;
433 s->frame = av_frame_alloc();
435 return AVERROR(ENOMEM);
440 static int cinepak_decode_frame(AVCodecContext *avctx,
441 void *data, int *got_frame,
444 const uint8_t *buf = avpkt->data;
445 int ret = 0, buf_size = avpkt->size;
446 CinepakContext *s = avctx->priv_data;
453 return AVERROR_INVALIDDATA;
455 num_strips = AV_RB16 (&s->data[8]);
457 //Empty frame, do not waste time
458 if (!num_strips && (!s->palette_video || !av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL)))
461 if ((ret = cinepak_predecode_check(s)) < 0) {
462 av_log(avctx, AV_LOG_ERROR, "cinepak_predecode_check failed\n");
466 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
469 if (s->palette_video) {
471 const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
472 if (pal && size == AVPALETTE_SIZE) {
473 s->frame->palette_has_changed = 1;
474 memcpy(s->pal, pal, AVPALETTE_SIZE);
476 av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
480 if ((ret = cinepak_decode(s)) < 0) {
481 av_log(avctx, AV_LOG_ERROR, "cinepak_decode failed\n");
484 if (s->palette_video)
485 memcpy (s->frame->data[1], s->pal, AVPALETTE_SIZE);
487 if ((ret = av_frame_ref(data, s->frame)) < 0)
492 /* report that the buffer was completely consumed */
496 static av_cold int cinepak_decode_end(AVCodecContext *avctx)
498 CinepakContext *s = avctx->priv_data;
500 av_frame_free(&s->frame);
505 AVCodec ff_cinepak_decoder = {
507 .long_name = NULL_IF_CONFIG_SMALL("Cinepak"),
508 .type = AVMEDIA_TYPE_VIDEO,
509 .id = AV_CODEC_ID_CINEPAK,
510 .priv_data_size = sizeof(CinepakContext),
511 .init = cinepak_decode_init,
512 .close = cinepak_decode_end,
513 .decode = cinepak_decode_frame,
514 .capabilities = AV_CODEC_CAP_DR1,