261 lines
8.0 KiB
C
261 lines
8.0 KiB
C
/*
|
|
* CamStudio decoder
|
|
* Copyright (c) 2006 Reimar Doeffinger
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
#include "libavutil/common.h"
|
|
|
|
#if CONFIG_ZLIB
|
|
#include <zlib.h>
|
|
#endif
|
|
#include "libavutil/lzo.h"
|
|
|
|
typedef struct CamStudioContext {
|
|
int linelen, height, bpp;
|
|
unsigned int decomp_size;
|
|
unsigned char* decomp_buf;
|
|
} CamStudioContext;
|
|
|
|
static void copy_frame_default(AVFrame *f, const uint8_t *src, int src_stride,
|
|
int linelen, int height) {
|
|
int i;
|
|
uint8_t *dst = f->data[0];
|
|
dst += (height - 1) * f->linesize[0];
|
|
for (i = height; i; i--) {
|
|
memcpy(dst, src, linelen);
|
|
src += src_stride;
|
|
dst -= f->linesize[0];
|
|
}
|
|
}
|
|
|
|
static void add_frame_default(AVFrame *f, const uint8_t *src, int src_stride,
|
|
int linelen, int height) {
|
|
int i, j;
|
|
uint8_t *dst = f->data[0];
|
|
dst += (height - 1) * f->linesize[0];
|
|
for (i = height; i; i--) {
|
|
for (j = linelen; j; j--)
|
|
*dst++ += *src++;
|
|
src += src_stride - linelen;
|
|
dst -= f->linesize[0] + linelen;
|
|
}
|
|
}
|
|
|
|
#if !HAVE_BIGENDIAN
|
|
#define copy_frame_16(f, s, l, h) copy_frame_default(f, s, l, l, h)
|
|
#define copy_frame_32(f, s, l, h) copy_frame_default(f, s, l, l, h)
|
|
#define add_frame_16(f, s, l, h) add_frame_default(f, s, l, l, h)
|
|
#define add_frame_32(f, s, l, h) add_frame_default(f, s, l, l, h)
|
|
#else
|
|
static void copy_frame_16(AVFrame *f, const uint8_t *src,
|
|
int linelen, int height) {
|
|
int i, j;
|
|
uint8_t *dst = f->data[0];
|
|
dst += (height - 1) * f->linesize[0];
|
|
for (i = height; i; i--) {
|
|
for (j = linelen / 2; j; j--) {
|
|
dst[0] = src[1];
|
|
dst[1] = src[0];
|
|
src += 2;
|
|
dst += 2;
|
|
}
|
|
dst -= f->linesize[0] + linelen;
|
|
}
|
|
}
|
|
|
|
static void copy_frame_32(AVFrame *f, const uint8_t *src,
|
|
int linelen, int height) {
|
|
int i, j;
|
|
uint8_t *dst = f->data[0];
|
|
dst += (height - 1) * f->linesize[0];
|
|
for (i = height; i; i--) {
|
|
for (j = linelen / 4; j; j--) {
|
|
dst[0] = src[3];
|
|
dst[1] = src[2];
|
|
dst[2] = src[1];
|
|
dst[3] = src[0];
|
|
src += 4;
|
|
dst += 4;
|
|
}
|
|
dst -= f->linesize[0] + linelen;
|
|
}
|
|
}
|
|
|
|
static void add_frame_16(AVFrame *f, const uint8_t *src,
|
|
int linelen, int height) {
|
|
int i, j;
|
|
uint8_t *dst = f->data[0];
|
|
dst += (height - 1) * f->linesize[0];
|
|
for (i = height; i; i--) {
|
|
for (j = linelen / 2; j; j--) {
|
|
dst[0] += src[1];
|
|
dst[1] += src[0];
|
|
src += 2;
|
|
dst += 2;
|
|
}
|
|
dst -= f->linesize[0] + linelen;
|
|
}
|
|
}
|
|
|
|
static void add_frame_32(AVFrame *f, const uint8_t *src,
|
|
int linelen, int height) {
|
|
int i, j;
|
|
uint8_t *dst = f->data[0];
|
|
dst += (height - 1) * f->linesize[0];
|
|
for (i = height; i; i--) {
|
|
for (j = linelen / 4; j; j--) {
|
|
dst[0] += src[3];
|
|
dst[1] += src[2];
|
|
dst[2] += src[1];
|
|
dst[3] += src[0];
|
|
src += 4;
|
|
dst += 4;
|
|
}
|
|
dst -= f->linesize[0] + linelen;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
|
|
AVPacket *avpkt) {
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
CamStudioContext *c = avctx->priv_data;
|
|
AVFrame *picture = data;
|
|
int ret;
|
|
|
|
if (buf_size < 2) {
|
|
av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if ((ret = ff_get_buffer(avctx, picture, 0)) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return ret;
|
|
}
|
|
|
|
// decompress data
|
|
switch ((buf[0] >> 1) & 7) {
|
|
case 0: { // lzo compression
|
|
int outlen = c->decomp_size, inlen = buf_size - 2;
|
|
if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen))
|
|
av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
|
|
break;
|
|
}
|
|
case 1: { // zlib compression
|
|
#if CONFIG_ZLIB
|
|
unsigned long dlen = c->decomp_size;
|
|
if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK)
|
|
av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
|
|
break;
|
|
#else
|
|
av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");
|
|
return AVERROR(ENOSYS);
|
|
#endif
|
|
}
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
// flip upside down, add difference frame
|
|
if (buf[0] & 1) { // keyframe
|
|
picture->pict_type = AV_PICTURE_TYPE_I;
|
|
picture->key_frame = 1;
|
|
switch (c->bpp) {
|
|
case 16:
|
|
copy_frame_16(picture, c->decomp_buf, c->linelen, c->height);
|
|
break;
|
|
case 32:
|
|
copy_frame_32(picture, c->decomp_buf, c->linelen, c->height);
|
|
break;
|
|
default:
|
|
copy_frame_default(picture, c->decomp_buf, FFALIGN(c->linelen, 4),
|
|
c->linelen, c->height);
|
|
}
|
|
} else {
|
|
picture->pict_type = AV_PICTURE_TYPE_P;
|
|
picture->key_frame = 0;
|
|
switch (c->bpp) {
|
|
case 16:
|
|
add_frame_16(picture, c->decomp_buf, c->linelen, c->height);
|
|
break;
|
|
case 32:
|
|
add_frame_32(picture, c->decomp_buf, c->linelen, c->height);
|
|
break;
|
|
default:
|
|
add_frame_default(picture, c->decomp_buf, FFALIGN(c->linelen, 4),
|
|
c->linelen, c->height);
|
|
}
|
|
}
|
|
|
|
*got_frame = 1;
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx) {
|
|
CamStudioContext *c = avctx->priv_data;
|
|
int stride;
|
|
switch (avctx->bits_per_coded_sample) {
|
|
case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
|
|
case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
|
|
case 32: avctx->pix_fmt = AV_PIX_FMT_RGB32; break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"CamStudio codec error: invalid depth %i bpp\n",
|
|
avctx->bits_per_coded_sample);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
c->bpp = avctx->bits_per_coded_sample;
|
|
c->linelen = avctx->width * avctx->bits_per_coded_sample / 8;
|
|
c->height = avctx->height;
|
|
stride = c->linelen;
|
|
if (avctx->bits_per_coded_sample == 24)
|
|
stride = FFALIGN(stride, 4);
|
|
c->decomp_size = c->height * stride;
|
|
c->decomp_buf = av_malloc(c->decomp_size + AV_LZO_OUTPUT_PADDING);
|
|
if (!c->decomp_buf) {
|
|
av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx) {
|
|
CamStudioContext *c = avctx->priv_data;
|
|
av_freep(&c->decomp_buf);
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_cscd_decoder = {
|
|
.name = "camstudio",
|
|
.long_name = NULL_IF_CONFIG_SMALL("CamStudio"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_CSCD,
|
|
.priv_data_size = sizeof(CamStudioContext),
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
.decode = decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
};
|