* Cinepak Video Decoder
* Copyright (C) 2003 the ffmpeg project
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file cinepak.c
+ * @file
* Cinepak video decoder
- * by Ewald Snel <ewald@rambo.its.tudelft.nl>
- * For more information on the Cinepak algorithm, visit:
+ * @author Ewald Snel <ewald@rambo.its.tudelft.nl>
+ *
+ * @see For more information on the Cinepak algorithm, visit:
* http://www.csse.monash.edu.au/~timf/
- * For more information on the quirky data inside Sega FILM/CPK files, visit:
+ * @see For more information on the quirky data inside Sega FILM/CPK files, visit:
* http://wiki.multimedia.cx/index.php?title=Sega_FILM
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <unistd.h>
+#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
int sega_film_skip_bytes;
+ uint32_t pal[256];
} CinepakContext;
static void cinepak_decode_codebook (cvid_codebook *codebook,
for (x=strip->x1; x < strip->x2; x+=4) {
if ((chunk_id & 0x01) && !(mask >>= 1)) {
if ((data + 4) > eod)
- return -1;
+ return AVERROR_INVALIDDATA;
flag = AV_RB32 (data);
data += 4;
if (!(chunk_id & 0x01) || (flag & mask)) {
if (!(chunk_id & 0x02) && !(mask >>= 1)) {
if ((data + 4) > eod)
- return -1;
+ return AVERROR_INVALIDDATA;
flag = AV_RB32 (data);
data += 4;
if ((chunk_id & 0x02) || (~flag & mask)) {
if (data >= eod)
- return -1;
+ return AVERROR_INVALIDDATA;
codebook = &strip->v1_codebook[*data++];
s->frame.data[0][iy[0] + 0] = codebook->y0;
} else if (flag & mask) {
if ((data + 4) > eod)
- return -1;
+ return AVERROR_INVALIDDATA;
codebook = &strip->v4_codebook[*data++];
s->frame.data[0][iy[0] + 0] = codebook->y0;
int chunk_id, chunk_size;
/* coordinate sanity checks */
- if (strip->x1 >= s->width || strip->x2 > s->width ||
- strip->y1 >= s->height || strip->y2 > s->height ||
+ if (strip->x2 > s->width ||
+ strip->y2 > s->height ||
strip->x1 >= strip->x2 || strip->y1 >= strip->y2)
- return -1;
+ return AVERROR_INVALIDDATA;
while ((data + 4) <= eod) {
chunk_id = data[0];
chunk_size = AV_RB24 (&data[1]) - 4;
if(chunk_size < 0)
- return -1;
+ return AVERROR_INVALIDDATA;
data += 4;
chunk_size = ((data + chunk_size) > eod) ? (eod - data) : chunk_size;
data += chunk_size;
}
- return -1;
+ return AVERROR_INVALIDDATA;
}
static int cinepak_decode (CinepakContext *s)
int encoded_buf_size;
if (s->size < 10)
- return -1;
+ return AVERROR_INVALIDDATA;
frame_flags = s->data[0];
num_strips = AV_RB16 (&s->data[8]);
- encoded_buf_size = ((s->data[1] << 16) | AV_RB16 (&s->data[2]));
+ encoded_buf_size = AV_RB24(&s->data[1]);
/* if this is the first frame, check for deviant Sega FILM data */
if (s->sega_film_skip_bytes == -1) {
- if (encoded_buf_size != s->size) {
+ if (!encoded_buf_size) {
+ av_log_ask_for_sample(s->avctx, "encoded_buf_size is 0");
+ return AVERROR_INVALIDDATA;
+ }
+ if (encoded_buf_size != s->size && (s->size % encoded_buf_size) != 0) {
/* If the encoded frame size differs from the frame size as indicated
* by the container file, this data likely comes from a Sega FILM/CPK file.
* If the frame header is followed by the bytes FE 00 00 06 00 00 then
* this is probably one of the two known files that have 6 extra bytes
- * after the frame header. Else, assume 2 extra bytes. */
- if ((s->data[10] == 0xFE) &&
+ * after the frame header. Else, assume 2 extra bytes. The container
+ * size also cannot be a multiple of the encoded size. */
+ if (s->size >= 16 &&
+ (s->data[10] == 0xFE) &&
(s->data[11] == 0x00) &&
(s->data[12] == 0x00) &&
(s->data[13] == 0x06) &&
s->data += 10 + s->sega_film_skip_bytes;
- if (num_strips > MAX_STRIPS)
- num_strips = MAX_STRIPS;
+ num_strips = FFMIN(num_strips, MAX_STRIPS);
for (i=0; i < num_strips; i++) {
if ((s->data + 12) > eod)
- return -1;
+ return AVERROR_INVALIDDATA;
s->strips[i].id = s->data[0];
s->strips[i].y1 = y0;
s->strips[i].x2 = s->avctx->width;
strip_size = AV_RB24 (&s->data[1]) - 12;
+ if (strip_size < 0)
+ return AVERROR_INVALIDDATA;
s->data += 12;
strip_size = ((s->data + strip_size) > eod) ? (eod - s->data) : strip_size;
s->sega_film_skip_bytes = -1; /* uninitialized state */
// check for paletted data
- if ((avctx->palctrl == NULL) || (avctx->bits_per_coded_sample == 40)) {
+ if (avctx->bits_per_coded_sample != 8) {
s->palette_video = 0;
avctx->pix_fmt = PIX_FMT_YUV420P;
} else {
static int cinepak_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- const uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int ret = 0, buf_size = avpkt->size;
CinepakContext *s = avctx->priv_data;
s->data = buf;
s->frame.reference = 1;
s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
FF_BUFFER_HINTS_REUSABLE;
- if (avctx->reget_buffer(avctx, &s->frame)) {
+ if ((ret = avctx->reget_buffer(avctx, &s->frame))) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
- return -1;
+ return ret;
}
- cinepak_decode(s);
-
if (s->palette_video) {
- memcpy (s->frame.data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
- if (avctx->palctrl->palette_changed) {
+ const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
+ if (pal) {
s->frame.palette_has_changed = 1;
- avctx->palctrl->palette_changed = 0;
- } else
- s->frame.palette_has_changed = 0;
+ memcpy(s->pal, pal, AVPALETTE_SIZE);
+ }
}
+ cinepak_decode(s);
+
+ if (s->palette_video)
+ memcpy (s->frame.data[1], s->pal, AVPALETTE_SIZE);
+
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
return 0;
}
-AVCodec cinepak_decoder = {
- "cinepak",
- CODEC_TYPE_VIDEO,
- CODEC_ID_CINEPAK,
- sizeof(CinepakContext),
- cinepak_decode_init,
- NULL,
- cinepak_decode_end,
- cinepak_decode_frame,
- CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("Cinepak"),
+AVCodec ff_cinepak_decoder = {
+ .name = "cinepak",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_CINEPAK,
+ .priv_data_size = sizeof(CinepakContext),
+ .init = cinepak_decode_init,
+ .close = cinepak_decode_end,
+ .decode = cinepak_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Cinepak"),
};
projects / ffmpeg / blobdiff