329 lines
8.9 KiB
C
329 lines
8.9 KiB
C
/*
|
|
* TechSmith Camtasia decoder
|
|
* Copyright (c) 2004 Konstantin Shishkov
|
|
*
|
|
* This library 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.
|
|
*
|
|
* This library 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
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* @file tscc.c
|
|
* TechSmith Camtasia decoder
|
|
*
|
|
* Fourcc: TSCC
|
|
*
|
|
* Codec is very simple:
|
|
* it codes picture (picture difference, really)
|
|
* with algorithm almost identical to Windows RLE8,
|
|
* only without padding and with greater pixel sizes,
|
|
* then this coded picture is packed with ZLib
|
|
*
|
|
* Supports: BGR8,BGR555,BGR24 - only BGR8 and BGR555 tested
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "common.h"
|
|
#include "avcodec.h"
|
|
|
|
#ifdef CONFIG_ZLIB
|
|
#include <zlib.h>
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Decoder context
|
|
*/
|
|
typedef struct TsccContext {
|
|
|
|
AVCodecContext *avctx;
|
|
AVFrame pic;
|
|
|
|
// Bits per pixel
|
|
int bpp;
|
|
// Decompressed data size
|
|
unsigned int decomp_size;
|
|
// Decompression buffer
|
|
unsigned char* decomp_buf;
|
|
int height;
|
|
#ifdef CONFIG_ZLIB
|
|
z_stream zstream;
|
|
#endif
|
|
} CamtasiaContext;
|
|
|
|
/*
|
|
*
|
|
* Decode RLE - almost identical to Windows BMP RLE8
|
|
* and enhanced to bigger color depths
|
|
*
|
|
*/
|
|
|
|
static int decode_rle(CamtasiaContext *c, unsigned int srcsize)
|
|
{
|
|
unsigned char *src = c->decomp_buf;
|
|
unsigned char *output, *output_end;
|
|
int p1, p2, line=c->height, pos=0, i;
|
|
|
|
output = c->pic.data[0] + (c->height - 1) * c->pic.linesize[0];
|
|
output_end = c->pic.data[0] + (c->height) * c->pic.linesize[0];
|
|
while(src < c->decomp_buf + srcsize) {
|
|
p1 = *src++;
|
|
if(p1 == 0) { //Escape code
|
|
p2 = *src++;
|
|
if(p2 == 0) { //End-of-line
|
|
output = c->pic.data[0] + (--line) * c->pic.linesize[0];
|
|
if (line < 0)
|
|
return -1;
|
|
pos = 0;
|
|
continue;
|
|
} else if(p2 == 1) { //End-of-picture
|
|
return 0;
|
|
} else if(p2 == 2) { //Skip
|
|
p1 = *src++;
|
|
p2 = *src++;
|
|
line -= p2;
|
|
if (line < 0)
|
|
return -1;
|
|
pos += p1;
|
|
output = c->pic.data[0] + line * c->pic.linesize[0] + pos * (c->bpp / 8);
|
|
continue;
|
|
}
|
|
// Copy data
|
|
if (output + p2 * (c->bpp / 8) > output_end) {
|
|
src += p2 * (c->bpp / 8);
|
|
continue;
|
|
}
|
|
for(i = 0; i < p2 * (c->bpp / 8); i++) {
|
|
*output++ = *src++;
|
|
}
|
|
// RLE8 copy is actually padded - and runs are not!
|
|
if(c->bpp == 8 && (p2 & 1)) {
|
|
src++;
|
|
}
|
|
pos += p2;
|
|
} else { //Run of pixels
|
|
int pix[4]; //original pixel
|
|
switch(c->bpp){
|
|
case 8: pix[0] = *src++;
|
|
break;
|
|
case 16: pix[0] = *src++;
|
|
pix[1] = *src++;
|
|
break;
|
|
case 24: pix[0] = *src++;
|
|
pix[1] = *src++;
|
|
pix[2] = *src++;
|
|
break;
|
|
case 32: pix[0] = *src++;
|
|
pix[1] = *src++;
|
|
pix[2] = *src++;
|
|
pix[3] = *src++;
|
|
break;
|
|
}
|
|
if (output + p1 * (c->bpp / 8) > output_end)
|
|
continue;
|
|
for(i = 0; i < p1; i++) {
|
|
switch(c->bpp){
|
|
case 8: *output++ = pix[0];
|
|
break;
|
|
case 16: *output++ = pix[0];
|
|
*output++ = pix[1];
|
|
break;
|
|
case 24: *output++ = pix[0];
|
|
*output++ = pix[1];
|
|
*output++ = pix[2];
|
|
break;
|
|
case 32: *output++ = pix[0];
|
|
*output++ = pix[1];
|
|
*output++ = pix[2];
|
|
*output++ = pix[3];
|
|
break;
|
|
}
|
|
}
|
|
pos += p1;
|
|
}
|
|
}
|
|
|
|
av_log(c->avctx, AV_LOG_ERROR, "Camtasia warning: no End-of-picture code\n");
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
*
|
|
* Decode a frame
|
|
*
|
|
*/
|
|
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
|
|
{
|
|
CamtasiaContext * const c = (CamtasiaContext *)avctx->priv_data;
|
|
unsigned char *encoded = (unsigned char *)buf;
|
|
unsigned char *outptr;
|
|
#ifdef CONFIG_ZLIB
|
|
int zret; // Zlib return code
|
|
#endif
|
|
int len = buf_size;
|
|
|
|
if(c->pic.data[0])
|
|
avctx->release_buffer(avctx, &c->pic);
|
|
|
|
c->pic.reference = 1;
|
|
c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
|
|
if(avctx->get_buffer(avctx, &c->pic) < 0){
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
outptr = c->pic.data[0]; // Output image pointer
|
|
|
|
#ifdef CONFIG_ZLIB
|
|
zret = inflateReset(&(c->zstream));
|
|
if (zret != Z_OK) {
|
|
av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
|
|
return -1;
|
|
}
|
|
c->zstream.next_in = encoded;
|
|
c->zstream.avail_in = len;
|
|
c->zstream.next_out = c->decomp_buf;
|
|
c->zstream.avail_out = c->decomp_size;
|
|
zret = inflate(&(c->zstream), Z_FINISH);
|
|
// Z_DATA_ERROR means empty picture
|
|
if ((zret != Z_OK) && (zret != Z_STREAM_END) && (zret != Z_DATA_ERROR)) {
|
|
av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
|
|
return -1;
|
|
}
|
|
|
|
|
|
if(zret != Z_DATA_ERROR)
|
|
decode_rle(c, c->zstream.avail_out);
|
|
|
|
/* make the palette available on the way out */
|
|
if (c->avctx->pix_fmt == PIX_FMT_PAL8) {
|
|
memcpy(c->pic.data[1], c->avctx->palctrl->palette, AVPALETTE_SIZE);
|
|
if (c->avctx->palctrl->palette_changed) {
|
|
c->pic.palette_has_changed = 1;
|
|
c->avctx->palctrl->palette_changed = 0;
|
|
}
|
|
}
|
|
|
|
#else
|
|
av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
|
|
return -1;
|
|
#endif
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data = c->pic;
|
|
|
|
/* always report that the buffer was completely consumed */
|
|
return buf_size;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
*
|
|
* Init tscc decoder
|
|
*
|
|
*/
|
|
static int decode_init(AVCodecContext *avctx)
|
|
{
|
|
CamtasiaContext * const c = (CamtasiaContext *)avctx->priv_data;
|
|
int zret; // Zlib return code
|
|
|
|
c->avctx = avctx;
|
|
avctx->has_b_frames = 0;
|
|
|
|
c->pic.data[0] = NULL;
|
|
c->height = avctx->height;
|
|
|
|
if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
|
|
return 1;
|
|
}
|
|
|
|
#ifdef CONFIG_ZLIB
|
|
// Needed if zlib unused or init aborted before inflateInit
|
|
memset(&(c->zstream), 0, sizeof(z_stream));
|
|
#else
|
|
av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
|
|
return 1;
|
|
#endif
|
|
switch(avctx->bits_per_sample){
|
|
case 8: avctx->pix_fmt = PIX_FMT_PAL8; break;
|
|
case 16: avctx->pix_fmt = PIX_FMT_RGB555; break;
|
|
case 24:
|
|
avctx->pix_fmt = PIX_FMT_BGR24;
|
|
break;
|
|
case 32: avctx->pix_fmt = PIX_FMT_RGBA32; break;
|
|
default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_sample);
|
|
return -1;
|
|
}
|
|
c->bpp = avctx->bits_per_sample;
|
|
c->decomp_size = (avctx->width * c->bpp + (avctx->width + 254) / 255 + 2) * avctx->height + 2;//RLE in the 'best' case
|
|
|
|
/* Allocate decompression buffer */
|
|
if (c->decomp_size) {
|
|
if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
|
|
av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_ZLIB
|
|
c->zstream.zalloc = Z_NULL;
|
|
c->zstream.zfree = Z_NULL;
|
|
c->zstream.opaque = Z_NULL;
|
|
zret = inflateInit(&(c->zstream));
|
|
if (zret != Z_OK) {
|
|
av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
*
|
|
* Uninit tscc decoder
|
|
*
|
|
*/
|
|
static int decode_end(AVCodecContext *avctx)
|
|
{
|
|
CamtasiaContext * const c = (CamtasiaContext *)avctx->priv_data;
|
|
|
|
if (c->pic.data[0])
|
|
avctx->release_buffer(avctx, &c->pic);
|
|
#ifdef CONFIG_ZLIB
|
|
inflateEnd(&(c->zstream));
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec tscc_decoder = {
|
|
"camtasia",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_TSCC,
|
|
sizeof(CamtasiaContext),
|
|
decode_init,
|
|
NULL,
|
|
decode_end,
|
|
decode_frame,
|
|
CODEC_CAP_DR1,
|
|
};
|
|
|