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/*
* CamStudio decoder
* Copyright (c) 2006 Reimar Doeffinger
* |
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* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/
#include <stdio.h>
#include <stdlib.h>
#include "avcodec.h"
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#if CONFIG_ZLIB |
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#include <zlib.h>
#endif |
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#include "libavutil/lzo.h" |
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typedef struct {
AVFrame pic;
int linelen, height, bpp;
unsigned int decomp_size;
unsigned char* decomp_buf;
} CamStudioContext;
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static void copy_frame_default(AVFrame *f, const uint8_t *src, int src_stride, |
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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); |
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src += src_stride; |
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dst -= f->linesize[0];
}
}
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static void add_frame_default(AVFrame *f, const uint8_t *src, int src_stride, |
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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++; |
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src += src_stride - linelen; |
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dst -= f->linesize[0] + linelen;
}
}
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#if !HAVE_BIGENDIAN |
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#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) |
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#else |
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static void copy_frame_16(AVFrame *f, const uint8_t *src, |
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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;
}
}
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static void copy_frame_32(AVFrame *f, const uint8_t *src, |
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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;
}
}
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static void add_frame_16(AVFrame *f, const uint8_t *src, |
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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;
}
}
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static void add_frame_32(AVFrame *f, const uint8_t *src, |
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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 *data_size, |
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AVPacket *avpkt) {
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size; |
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CamStudioContext *c = avctx->priv_data; |
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AVFrame *picture = data;
if (buf_size < 2) {
av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
return -1;
}
if (c->pic.data[0])
avctx->release_buffer(avctx, &c->pic); |
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c->pic.reference = 3; |
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c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
if (avctx->get_buffer(avctx, &c->pic) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
// decompress data
switch ((buf[0] >> 1) & 7) {
case 0: { // lzo compression |
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int outlen = c->decomp_size, inlen = buf_size - 2; |
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if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen)) |
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av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
break;
}
case 1: { // zlib compression |
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#if CONFIG_ZLIB |
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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 -1;
#endif
}
default:
av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
return -1;
}
// flip upside down, add difference frame
if (buf[0] & 1) { // keyframe |
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c->pic.pict_type = AV_PICTURE_TYPE_I; |
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c->pic.key_frame = 1;
switch (c->bpp) {
case 16:
copy_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
break;
case 32:
copy_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
break;
default: |
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copy_frame_default(&c->pic, c->decomp_buf, FFALIGN(c->linelen, 4),
c->linelen, c->height); |
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}
} else { |
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c->pic.pict_type = AV_PICTURE_TYPE_P; |
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c->pic.key_frame = 0;
switch (c->bpp) {
case 16:
add_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
break;
case 32:
add_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
break;
default: |
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add_frame_default(&c->pic, c->decomp_buf, FFALIGN(c->linelen, 4),
c->linelen, c->height); |
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}
}
*picture = c->pic;
*data_size = sizeof(AVFrame);
return buf_size;
}
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static av_cold int decode_init(AVCodecContext *avctx) { |
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CamStudioContext *c = avctx->priv_data; |
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int stride; |
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switch (avctx->bits_per_coded_sample) { |
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case 16: avctx->pix_fmt = PIX_FMT_RGB555; break; |
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case 24: avctx->pix_fmt = PIX_FMT_BGR24; break; |
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case 32: avctx->pix_fmt = PIX_FMT_RGB32; break; |
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default:
av_log(avctx, AV_LOG_ERROR, |
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"CamStudio codec error: invalid depth %i bpp\n", |
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avctx->bits_per_coded_sample); |
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return 1; |
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} |
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c->bpp = avctx->bits_per_coded_sample; |
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avcodec_get_frame_defaults(&c->pic); |
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c->pic.data[0] = NULL; |
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c->linelen = avctx->width * avctx->bits_per_coded_sample / 8; |
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c->height = avctx->height; |
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stride = c->linelen;
if (avctx->bits_per_coded_sample == 24)
stride = FFALIGN(stride, 4);
c->decomp_size = c->height * stride; |
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c->decomp_buf = av_malloc(c->decomp_size + AV_LZO_OUTPUT_PADDING); |
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if (!c->decomp_buf) {
av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
return 1;
}
return 0;
}
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static av_cold int decode_end(AVCodecContext *avctx) { |
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CamStudioContext *c = avctx->priv_data; |
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av_freep(&c->decomp_buf);
if (c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
return 0;
}
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AVCodec ff_cscd_decoder = { |
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.name = "camstudio",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_CSCD,
.priv_data_size = sizeof(CamStudioContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("CamStudio"), |
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};
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