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ffmpeg/libavcodec/cinepak.c

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/*
* Cinepak Video Decoder
* Copyright (C) 2003 The FFmpeg project
*
* 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 2.1 of the License, or (at your option) any later version.
*
* 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Cinepak video decoder
* @author Ewald Snel <ewald@rambo.its.tudelft.nl>
*
* @see For more information on the Cinepak algorithm, visit:
* http://www.csse.monash.edu.au/~timf/
* @see For more information on the quirky data inside Sega FILM/CPK files, visit:
* http://wiki.multimedia.cx/index.php?title=Sega_FILM
*
* Cinepak colorspace support (c) 2013 Rl, Aetey Global Technologies AB
* @author Cinepak colorspace, Rl, Aetey Global Technologies AB
*/
#include <stdio.h>
#include <string.h>
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
typedef uint8_t cvid_codebook[12];
#define MAX_STRIPS 32
typedef struct cvid_strip {
uint16_t id;
uint16_t x1, y1;
uint16_t x2, y2;
cvid_codebook v4_codebook[256];
cvid_codebook v1_codebook[256];
} cvid_strip;
typedef struct CinepakContext {
AVCodecContext *avctx;
AVFrame *frame;
const unsigned char *data;
int size;
int width, height;
int palette_video;
cvid_strip strips[MAX_STRIPS];
int sega_film_skip_bytes;
uint32_t pal[256];
} CinepakContext;
static void cinepak_decode_codebook (cvid_codebook *codebook,
int chunk_id, int size, const uint8_t *data)
{
const uint8_t *eod = (data + size);
uint32_t flag, mask;
int i, n;
uint8_t *p;
/* check if this chunk contains 4- or 6-element vectors */
n = (chunk_id & 0x04) ? 4 : 6;
flag = 0;
mask = 0;
p = codebook[0];
for (i=0; i < 256; i++) {
if ((chunk_id & 0x01) && !(mask >>= 1)) {
if ((data + 4) > eod)
break;
flag = AV_RB32 (data);
data += 4;
mask = 0x80000000;
}
if (!(chunk_id & 0x01) || (flag & mask)) {
int k, kk;
if ((data + n) > eod)
break;
for (k = 0; k < 4; ++k) {
int r = *data++;
for (kk = 0; kk < 3; ++kk)
*p++ = r;
}
if (n == 6) {
int r, g, b, u, v;
u = *(int8_t *)data++;
v = *(int8_t *)data++;
p -= 12;
for(k=0; k<4; ++k) {
r = *p++ + v*2;
g = *p++ - (u/2) - v;
b = *p + u*2;
p -= 2;
*p++ = av_clip_uint8(r);
*p++ = av_clip_uint8(g);
*p++ = av_clip_uint8(b);
}
}
} else {
p += 12;
}
}
}
static int cinepak_decode_vectors (CinepakContext *s, cvid_strip *strip,
int chunk_id, int size, const uint8_t *data)
{
const uint8_t *eod = (data + size);
uint32_t flag, mask;
uint8_t *cb0, *cb1, *cb2, *cb3;
int x, y;
char *ip0, *ip1, *ip2, *ip3;
flag = 0;
mask = 0;
for (y=strip->y1; y < strip->y2; y+=4) {
/* take care of y dimension not being multiple of 4, such streams exist */
ip0 = ip1 = ip2 = ip3 = s->frame->data[0] +
(s->palette_video?strip->x1:strip->x1*3) + (y * s->frame->linesize[0]);
if(s->avctx->height - y > 1) {
ip1 = ip0 + s->frame->linesize[0];
if(s->avctx->height - y > 2) {
ip2 = ip1 + s->frame->linesize[0];
if(s->avctx->height - y > 3) {
ip3 = ip2 + s->frame->linesize[0];
}
}
}
/* to get the correct picture for not-multiple-of-4 cases let us fill each
* block from the bottom up, thus possibly overwriting the bottommost line
* more than once but ending with the correct data in place
* (instead of in-loop checking) */
for (x=strip->x1; x < strip->x2; x+=4) {
if ((chunk_id & 0x01) && !(mask >>= 1)) {
if ((data + 4) > eod)
return AVERROR_INVALIDDATA;
flag = AV_RB32 (data);
data += 4;
mask = 0x80000000;
}
if (!(chunk_id & 0x01) || (flag & mask)) {
if (!(chunk_id & 0x02) && !(mask >>= 1)) {
if ((data + 4) > eod)
return AVERROR_INVALIDDATA;
flag = AV_RB32 (data);
data += 4;
mask = 0x80000000;
}
if ((chunk_id & 0x02) || (~flag & mask)) {
uint8_t *p;
if (data >= eod)
return AVERROR_INVALIDDATA;
p = strip->v1_codebook[*data++];
if (s->palette_video) {
ip3[0] = ip3[1] = ip2[0] = ip2[1] = p[6];
ip3[2] = ip3[3] = ip2[2] = ip2[3] = p[9];
ip1[0] = ip1[1] = ip0[0] = ip0[1] = p[0];
ip1[2] = ip1[3] = ip0[2] = ip0[3] = p[3];
} else {
p += 6;
memcpy(ip3 + 0, p, 3); memcpy(ip3 + 3, p, 3);
memcpy(ip2 + 0, p, 3); memcpy(ip2 + 3, p, 3);
p += 3; /* ... + 9 */
memcpy(ip3 + 6, p, 3); memcpy(ip3 + 9, p, 3);
memcpy(ip2 + 6, p, 3); memcpy(ip2 + 9, p, 3);
p -= 9; /* ... + 0 */
memcpy(ip1 + 0, p, 3); memcpy(ip1 + 3, p, 3);
memcpy(ip0 + 0, p, 3); memcpy(ip0 + 3, p, 3);
p += 3; /* ... + 3 */
memcpy(ip1 + 6, p, 3); memcpy(ip1 + 9, p, 3);
memcpy(ip0 + 6, p, 3); memcpy(ip0 + 9, p, 3);
}
} else if (flag & mask) {
if ((data + 4) > eod)
return AVERROR_INVALIDDATA;
cb0 = strip->v4_codebook[*data++];
cb1 = strip->v4_codebook[*data++];
cb2 = strip->v4_codebook[*data++];
cb3 = strip->v4_codebook[*data++];
if (s->palette_video) {
uint8_t *p;
p = ip3;
*p++ = cb2[6];
*p++ = cb2[9];
*p++ = cb3[6];
*p = cb3[9];
p = ip2;
*p++ = cb2[0];
*p++ = cb2[3];
*p++ = cb3[0];
*p = cb3[3];
p = ip1;
*p++ = cb0[6];
*p++ = cb0[9];
*p++ = cb1[6];
*p = cb1[9];
p = ip0;
*p++ = cb0[0];
*p++ = cb0[3];
*p++ = cb1[0];
*p = cb1[3];
} else {
memcpy(ip3 + 0, cb2 + 6, 6);
memcpy(ip3 + 6, cb3 + 6, 6);
memcpy(ip2 + 0, cb2 + 0, 6);
memcpy(ip2 + 6, cb3 + 0, 6);
memcpy(ip1 + 0, cb0 + 6, 6);
memcpy(ip1 + 6, cb1 + 6, 6);
memcpy(ip0 + 0, cb0 + 0, 6);
memcpy(ip0 + 6, cb1 + 0, 6);
}
}
}
if (s->palette_video) {
ip0 += 4; ip1 += 4;
ip2 += 4; ip3 += 4;
} else {
ip0 += 12; ip1 += 12;
ip2 += 12; ip3 += 12;
}
}
}
return 0;
}
static int cinepak_decode_strip (CinepakContext *s,
cvid_strip *strip, const uint8_t *data, int size)
{
const uint8_t *eod = (data + size);
int chunk_id, chunk_size;
/* coordinate sanity checks */
if (strip->x2 > s->width ||
strip->y2 > s->height ||
strip->x1 >= strip->x2 || strip->y1 >= strip->y2)
return AVERROR_INVALIDDATA;
while ((data + 4) <= eod) {
chunk_id = data[0];
chunk_size = AV_RB24 (&data[1]) - 4;
if(chunk_size < 0)
return AVERROR_INVALIDDATA;
data += 4;
chunk_size = ((data + chunk_size) > eod) ? (eod - data) : chunk_size;
switch (chunk_id) {
case 0x20:
case 0x21:
case 0x24:
case 0x25:
cinepak_decode_codebook (strip->v4_codebook, chunk_id,
chunk_size, data);
break;
case 0x22:
case 0x23:
case 0x26:
case 0x27:
cinepak_decode_codebook (strip->v1_codebook, chunk_id,
chunk_size, data);
break;
case 0x30:
case 0x31:
case 0x32:
return cinepak_decode_vectors (s, strip, chunk_id,
chunk_size, data);
}
data += chunk_size;
}
return AVERROR_INVALIDDATA;
}
static int cinepak_predecode_check (CinepakContext *s)
{
int num_strips;
int encoded_buf_size;
num_strips = AV_RB16 (&s->data[8]);
encoded_buf_size = AV_RB24(&s->data[1]);
if (s->size < encoded_buf_size * (int64_t)(100 - s->avctx->discard_damaged_percentage) / 100)
return AVERROR_INVALIDDATA;
/* if this is the first frame, check for deviant Sega FILM data */
if (s->sega_film_skip_bytes == -1) {
if (!encoded_buf_size) {
avpriv_request_sample(s->avctx, "encoded_buf_size 0");
return AVERROR_PATCHWELCOME;
}
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. 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[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;
}
if (s->size < 10 + s->sega_film_skip_bytes + num_strips * 12)
return AVERROR_INVALIDDATA;
if (num_strips) {
const uint8_t *data = s->data + 10 + s->sega_film_skip_bytes;
int strip_size = AV_RB24 (data + 1);
if (strip_size < 12 || strip_size > encoded_buf_size)
return AVERROR_INVALIDDATA;
}
return 0;
}
static int cinepak_decode (CinepakContext *s)
{
const uint8_t *eod = (s->data + s->size);
int i, result, strip_size, frame_flags, num_strips;
int y0 = 0;
frame_flags = s->data[0];
num_strips = AV_RB16 (&s->data[8]);
s->data += 10 + s->sega_film_skip_bytes;
num_strips = FFMIN(num_strips, MAX_STRIPS);
s->frame->key_frame = 0;
for (i=0; i < num_strips; i++) {
if ((s->data + 12) > eod)
return AVERROR_INVALIDDATA;
s->strips[i].id = s->data[0];
/* zero y1 means "relative to the previous stripe" */
if (!(s->strips[i].y1 = AV_RB16 (&s->data[4])))
s->strips[i].y2 = (s->strips[i].y1 = y0) + AV_RB16 (&s->data[8]);
else
s->strips[i].y2 = AV_RB16 (&s->data[8]);
s->strips[i].x1 = AV_RB16 (&s->data[6]);
s->strips[i].x2 = AV_RB16 (&s->data[10]);
if (s->strips[i].id == 0x10)
s->frame->key_frame = 1;
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;
if ((i > 0) && !(frame_flags & 0x01)) {
memcpy (s->strips[i].v4_codebook, s->strips[i-1].v4_codebook,
sizeof(s->strips[i].v4_codebook));
memcpy (s->strips[i].v1_codebook, s->strips[i-1].v1_codebook,
sizeof(s->strips[i].v1_codebook));
}
result = cinepak_decode_strip (s, &s->strips[i], s->data, strip_size);
if (result != 0)
return result;
s->data += strip_size;
y0 = s->strips[i].y2;
}
return 0;
}
static av_cold int cinepak_decode_init(AVCodecContext *avctx)
{
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->bits_per_coded_sample != 8) {
s->palette_video = 0;
avctx->pix_fmt = AV_PIX_FMT_RGB24;
} else {
s->palette_video = 1;
avctx->pix_fmt = AV_PIX_FMT_PAL8;
}
s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM);
return 0;
}
static int cinepak_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int ret = 0, buf_size = avpkt->size;
CinepakContext *s = avctx->priv_data;
int num_strips;
s->data = buf;
s->size = buf_size;
if (s->size < 10)
return AVERROR_INVALIDDATA;
num_strips = AV_RB16 (&s->data[8]);
//Empty frame, do not waste time
if (!num_strips && (!s->palette_video || !av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL)))
return buf_size;
if ((ret = cinepak_predecode_check(s)) < 0) {
av_log(avctx, AV_LOG_ERROR, "cinepak_predecode_check failed\n");
return ret;
}
if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
return ret;
if (s->palette_video) {
s->frame->palette_has_changed = ff_copy_palette(s->pal, avpkt, avctx);
}
if ((ret = cinepak_decode(s)) < 0) {
av_log(avctx, AV_LOG_ERROR, "cinepak_decode failed\n");
}
if (s->palette_video)
memcpy (s->frame->data[1], s->pal, AVPALETTE_SIZE);
if ((ret = av_frame_ref(rframe, s->frame)) < 0)
return ret;
*got_frame = 1;
/* report that the buffer was completely consumed */
return buf_size;
}
static av_cold int cinepak_decode_end(AVCodecContext *avctx)
{
CinepakContext *s = avctx->priv_data;
av_frame_free(&s->frame);
return 0;
}
const FFCodec ff_cinepak_decoder = {
.p.name = "cinepak",
CODEC_LONG_NAME("Cinepak"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_CINEPAK,
.priv_data_size = sizeof(CinepakContext),
.init = cinepak_decode_init,
.close = cinepak_decode_end,
FF_CODEC_DECODE_CB(cinepak_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
};
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