* Cinepak Video Decoder
* Copyright (C) 2003 the ffmpeg project
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg 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 this library; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
*/
/**
- * @file cinepak.c
+ * @file libavcodec/cinepak.c
* Cinepak video decoder
* by Ewald Snel <ewald@rambo.its.tudelft.nl>
* 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:
+ * http://wiki.multimedia.cx/index.php?title=Sega_FILM
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <unistd.h>
-#include "common.h"
+#include "libavutil/intreadwrite.h"
#include "avcodec.h"
-#include "dsputil.h"
typedef struct {
uint8_t y0, y1, y2, y3;
uint8_t u, v;
-} cvid_codebook_t;
+} cvid_codebook;
#define MAX_STRIPS 32
uint16_t id;
uint16_t x1, y1;
uint16_t x2, y2;
- cvid_codebook_t v4_codebook[256];
- cvid_codebook_t v1_codebook[256];
-} cvid_strip_t;
+ cvid_codebook v4_codebook[256];
+ cvid_codebook v1_codebook[256];
+} cvid_strip;
typedef struct CinepakContext {
AVCodecContext *avctx;
- DSPContext dsp;
AVFrame frame;
- unsigned char *data;
+ const unsigned char *data;
int size;
int width, height;
int palette_video;
- cvid_strip_t strips[MAX_STRIPS];
+ cvid_strip strips[MAX_STRIPS];
+
+ int sega_film_skip_bytes;
} CinepakContext;
-static void cinepak_decode_codebook (cvid_codebook_t *codebook,
- int chunk_id, int size, uint8_t *data)
+static void cinepak_decode_codebook (cvid_codebook *codebook,
+ int chunk_id, int size, const uint8_t *data)
{
- uint8_t *eod = (data + size);
+ const uint8_t *eod = (data + size);
uint32_t flag, mask;
int i, n;
/* check if this chunk contains 4- or 6-element vectors */
- n = (chunk_id & 0x0400) ? 4 : 6;
+ n = (chunk_id & 0x04) ? 4 : 6;
flag = 0;
mask = 0;
for (i=0; i < 256; i++) {
- if ((chunk_id & 0x0100) && !(mask >>= 1)) {
+ if ((chunk_id & 0x01) && !(mask >>= 1)) {
if ((data + 4) > eod)
break;
- flag = BE_32 (data);
+ flag = AV_RB32 (data);
data += 4;
mask = 0x80000000;
}
- if (!(chunk_id & 0x0100) || (flag & mask)) {
+ if (!(chunk_id & 0x01) || (flag & mask)) {
if ((data + n) > eod)
break;
}
}
-static int cinepak_decode_vectors (CinepakContext *s, cvid_strip_t *strip,
- int chunk_id, int size, uint8_t *data)
+static int cinepak_decode_vectors (CinepakContext *s, cvid_strip *strip,
+ int chunk_id, int size, const uint8_t *data)
{
- uint8_t *eod = (data + size);
+ const uint8_t *eod = (data + size);
uint32_t flag, mask;
- cvid_codebook_t *codebook;
+ cvid_codebook *codebook;
unsigned int x, y;
uint32_t iy[4];
uint32_t iu[2];
iv[1] = iv[0] + s->frame.linesize[2];
for (x=strip->x1; x < strip->x2; x+=4) {
- if ((chunk_id & 0x0100) && !(mask >>= 1)) {
+ if ((chunk_id & 0x01) && !(mask >>= 1)) {
if ((data + 4) > eod)
return -1;
- flag = BE_32 (data);
+ flag = AV_RB32 (data);
data += 4;
mask = 0x80000000;
}
- if (!(chunk_id & 0x0100) || (flag & mask)) {
- if (!(chunk_id & 0x0200) && !(mask >>= 1)) {
+ if (!(chunk_id & 0x01) || (flag & mask)) {
+ if (!(chunk_id & 0x02) && !(mask >>= 1)) {
if ((data + 4) > eod)
return -1;
- flag = BE_32 (data);
+ flag = AV_RB32 (data);
data += 4;
mask = 0x80000000;
}
- if ((chunk_id & 0x0200) || (~flag & mask)) {
+ if ((chunk_id & 0x02) || (~flag & mask)) {
if (data >= eod)
return -1;
}
static int cinepak_decode_strip (CinepakContext *s,
- cvid_strip_t *strip, uint8_t *data, int size)
+ cvid_strip *strip, const uint8_t *data, int size)
{
- uint8_t *eod = (data + size);
+ const uint8_t *eod = (data + size);
int chunk_id, chunk_size;
/* coordinate sanity checks */
return -1;
while ((data + 4) <= eod) {
- chunk_id = BE_16 (&data[0]);
- chunk_size = BE_16 (&data[2]) - 4;
+ chunk_id = data[0];
+ chunk_size = AV_RB24 (&data[1]) - 4;
if(chunk_size < 0)
return -1;
switch (chunk_id) {
- case 0x2000:
- case 0x2100:
- case 0x2400:
- case 0x2500:
+ case 0x20:
+ case 0x21:
+ case 0x24:
+ case 0x25:
cinepak_decode_codebook (strip->v4_codebook, chunk_id,
chunk_size, data);
break;
- case 0x2200:
- case 0x2300:
- case 0x2600:
- case 0x2700:
+ case 0x22:
+ case 0x23:
+ case 0x26:
+ case 0x27:
cinepak_decode_codebook (strip->v1_codebook, chunk_id,
chunk_size, data);
break;
- case 0x3000:
- case 0x3100:
- case 0x3200:
+ case 0x30:
+ case 0x31:
+ case 0x32:
return cinepak_decode_vectors (s, strip, chunk_id,
chunk_size, data);
}
static int cinepak_decode (CinepakContext *s)
{
- uint8_t *eod = (s->data + s->size);
+ const uint8_t *eod = (s->data + s->size);
int i, result, strip_size, frame_flags, num_strips;
int y0 = 0;
int encoded_buf_size;
- /* if true, Cinepak data is from a Sega FILM/CPK file */
- int sega_film_data = 0;
if (s->size < 10)
return -1;
frame_flags = s->data[0];
- num_strips = BE_16 (&s->data[8]);
- encoded_buf_size = ((s->data[1] << 16) | BE_16 (&s->data[2]));
- if (encoded_buf_size != s->size)
- sega_film_data = 1;
- if (sega_film_data)
- s->data += 12;
- else
- s->data += 10;
+ num_strips = AV_RB16 (&s->data[8]);
+ encoded_buf_size = ((s->data[1] << 16) | AV_RB16 (&s->data[2]));
+
+ /* 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 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) &&
+ (s->data[11] == 0x00) &&
+ (s->data[12] == 0x00) &&
+ (s->data[13] == 0x06) &&
+ (s->data[14] == 0x00) &&
+ (s->data[15] == 0x00))
+ s->sega_film_skip_bytes = 6;
+ else
+ s->sega_film_skip_bytes = 2;
+ } else
+ s->sega_film_skip_bytes = 0;
+ }
+
+ s->data += 10 + s->sega_film_skip_bytes;
if (num_strips > MAX_STRIPS)
num_strips = MAX_STRIPS;
if ((s->data + 12) > eod)
return -1;
- s->strips[i].id = BE_16 (s->data);
+ s->strips[i].id = s->data[0];
s->strips[i].y1 = y0;
s->strips[i].x1 = 0;
- s->strips[i].y2 = y0 + BE_16 (&s->data[8]);
+ s->strips[i].y2 = y0 + AV_RB16 (&s->data[8]);
s->strips[i].x2 = s->avctx->width;
- strip_size = BE_16 (&s->data[2]) - 12;
+ strip_size = AV_RB24 (&s->data[1]) - 12;
s->data += 12;
strip_size = ((s->data + strip_size) > eod) ? (eod - s->data) : strip_size;
return 0;
}
-static int cinepak_decode_init(AVCodecContext *avctx)
+static av_cold int cinepak_decode_init(AVCodecContext *avctx)
{
- CinepakContext *s = (CinepakContext *)avctx->priv_data;
+ CinepakContext *s = avctx->priv_data;
s->avctx = avctx;
s->width = (avctx->width + 3) & ~3;
s->height = (avctx->height + 3) & ~3;
+ s->sega_film_skip_bytes = -1; /* uninitialized state */
// check for paletted data
- if ((avctx->palctrl == NULL) || (avctx->bits_per_sample == 40)) {
+ if ((avctx->palctrl == NULL) || (avctx->bits_per_coded_sample == 40)) {
s->palette_video = 0;
avctx->pix_fmt = PIX_FMT_YUV420P;
} else {
avctx->pix_fmt = PIX_FMT_PAL8;
}
- avctx->has_b_frames = 0;
- dsputil_init(&s->dsp, avctx);
-
s->frame.data[0] = NULL;
return 0;
static int cinepak_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
- CinepakContext *s = (CinepakContext *)avctx->priv_data;
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ CinepakContext *s = avctx->priv_data;
s->data = buf;
s->size = buf_size;
return buf_size;
}
-static int cinepak_decode_end(AVCodecContext *avctx)
+static av_cold int cinepak_decode_end(AVCodecContext *avctx)
{
- CinepakContext *s = (CinepakContext *)avctx->priv_data;
+ CinepakContext *s = avctx->priv_data;
if (s->frame.data[0])
avctx->release_buffer(avctx, &s->frame);
AVCodec cinepak_decoder = {
"cinepak",
- CODEC_TYPE_VIDEO,
+ AVMEDIA_TYPE_VIDEO,
CODEC_ID_CINEPAK,
sizeof(CinepakContext),
cinepak_decode_init,
cinepak_decode_end,
cinepak_decode_frame,
CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Cinepak"),
};
projects / ffmpeg / blobdiff