mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-22 09:15:06 +02:00
![Reimar Döffinger](/assets/img/avatar_default.png)
Using release_buffer and get_buffer as currently might not prefer the previous frame contents which the decoder relies on. This leads to horrible playback in players using direct rendering like MPlayer. Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
172 lines
5.6 KiB
C
172 lines
5.6 KiB
C
/*
|
|
* CamStudio decoder
|
|
* Copyright (c) 2006 Reimar Doeffinger
|
|
*
|
|
* 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
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "avcodec.h"
|
|
|
|
#if CONFIG_ZLIB
|
|
#include <zlib.h>
|
|
#endif
|
|
#include "libavutil/lzo.h"
|
|
|
|
typedef struct {
|
|
AVFrame pic;
|
|
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 linelen, int height) {
|
|
int i, src_stride = FFALIGN(linelen, 4);
|
|
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 linelen, int height) {
|
|
int i, j, src_stride = FFALIGN(linelen, 4);
|
|
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;
|
|
}
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
|
|
AVPacket *avpkt) {
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
CamStudioContext *c = avctx->priv_data;
|
|
AVFrame *picture = data;
|
|
|
|
if (buf_size < 2) {
|
|
av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
|
|
return -1;
|
|
}
|
|
|
|
c->pic.reference = 3;
|
|
c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
|
|
FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
|
|
if (avctx->reget_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
|
|
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 -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
|
|
c->pic.pict_type = AV_PICTURE_TYPE_I;
|
|
c->pic.key_frame = 1;
|
|
copy_frame_default(&c->pic, c->decomp_buf,
|
|
c->linelen, c->height);
|
|
} else {
|
|
c->pic.pict_type = AV_PICTURE_TYPE_P;
|
|
c->pic.key_frame = 0;
|
|
add_frame_default(&c->pic, c->decomp_buf,
|
|
c->linelen, c->height);
|
|
}
|
|
|
|
*picture = c->pic;
|
|
*data_size = sizeof(AVFrame);
|
|
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 = PIX_FMT_RGB555LE; break;
|
|
case 24: avctx->pix_fmt = PIX_FMT_BGR24; break;
|
|
case 32: avctx->pix_fmt = PIX_FMT_BGRA; 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;
|
|
avcodec_get_frame_defaults(&c->pic);
|
|
c->pic.data[0] = NULL;
|
|
c->linelen = avctx->width * avctx->bits_per_coded_sample / 8;
|
|
c->height = avctx->height;
|
|
stride = FFALIGN(c->linelen, 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);
|
|
if (c->pic.data[0])
|
|
avctx->release_buffer(avctx, &c->pic);
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_cscd_decoder = {
|
|
.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,
|
|
.long_name = NULL_IF_CONFIG_SMALL("CamStudio"),
|
|
};
|