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Fix 24 bpp CSCD decoding, as for Windows bitmaps in this (and only this) 

case the stride must be aligned to a multiple of 4.
The original CSCD encoder just compresses bitmaps it gets via Windows
API functions as-is, thus it uses exactly those alignment rules.

Originally committed as revision 25096 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2010-09-10 17:33:31 +00:00
parent 324d22b2b4
commit 936cfbc589
1 changed files with 17 additions and 10 deletions
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27
libavcodec/cscd.c
View File

@ -35,19 +35,19 @@ typedef struct {
unsigned char* decomp_buf;
} CamStudioContext;
static void copy_frame_default(AVFrame *f, const uint8_t *src,
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 += linelen;
src += src_stride;
dst -= f->linesize[0];
}
}
static void add_frame_default(AVFrame *f, const uint8_t *src,
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];
@ -55,15 +55,16 @@ static void add_frame_default(AVFrame *f, const uint8_t *src,
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 copy_frame_default
#define copy_frame_32 copy_frame_default
#define add_frame_16 add_frame_default
#define add_frame_32 add_frame_default
#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) {
@ -192,7 +193,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
copy_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
break;
default:
copy_frame_default(&c->pic, c->decomp_buf, c->linelen, c->height);
copy_frame_default(&c->pic, c->decomp_buf, FFALIGN(c->linelen, 4),
c->linelen, c->height);
}
} else {
c->pic.pict_type = FF_P_TYPE;
@ -205,7 +207,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
add_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
break;
default:
add_frame_default(&c->pic, c->decomp_buf, c->linelen, c->height);
add_frame_default(&c->pic, c->decomp_buf, FFALIGN(c->linelen, 4),
c->linelen, c->height);
}
}
@ -216,6 +219,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_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_RGB555; break;
case 24: avctx->pix_fmt = PIX_FMT_BGR24; break;
@ -230,7 +234,10 @@ static av_cold int decode_init(AVCodecContext *avctx) {
c->pic.data[0] = NULL;
c->linelen = avctx->width * avctx->bits_per_coded_sample / 8;
c->height = avctx->height;
c->decomp_size = c->height * c->linelen;
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");