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Implement sws_getCachedContext() in swscale emulation 

Originally committed as revision 6718 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Luca Abeni 2006-10-17 10:26:37 +00:00
parent 4041a495a8
commit 96db380836
2 changed files with 41 additions and 0 deletions
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36
libavcodec/imgresample.c
View File

@ -676,6 +676,42 @@ void sws_freeContext(struct SwsContext *ctx)
av_free(ctx);
}
/**
* Checks if context is valid or reallocs a new one instead.
* If context is NULL, just calls sws_getContext() to get a new one.
* Otherwise, checks if the parameters are the same already saved in context.
* If that is the case, returns the current context.
* Otherwise, frees context and gets a new one.
*
* Be warned that srcFilter, dstFilter are not checked, they are
* asumed to remain valid.
*/
struct SwsContext *sws_getCachedContext(struct SwsContext *ctx,
int srcW, int srcH, int srcFormat,
int dstW, int dstH, int dstFormat, int flags,
SwsFilter *srcFilter, SwsFilter *dstFilter, double *param)
{
if (ctx != NULL) {
if ((ctx->resampling_ctx->iwidth != srcW) ||
(ctx->resampling_ctx->iheight != srcH) ||
(ctx->src_pix_fmt != srcFormat) ||
(ctx->resampling_ctx->owidth != dstW) ||
(ctx->resampling_ctx->oheight != dstH) ||
(ctx->dst_pix_fmt != dstFormat))
{
sws_freeContext(ctx);
ctx = NULL;
}
}
if (ctx == NULL) {
return sws_getContext(srcW, srcH, srcFormat,
dstW, dstH, dstFormat, flags,
srcFilter, dstFilter, param);
}
return ctx;
}
int sws_scale(struct SwsContext *ctx, uint8_t* src[], int srcStride[],
int srcSliceY, int srcSliceH, uint8_t* dst[], int dstStride[])
{

5
libavcodec/swscale.h
View File

@ -54,6 +54,11 @@ int sws_scale(struct SwsContext *ctx, uint8_t* src[], int srcStride[],
void sws_freeContext(struct SwsContext *swsContext);
struct SwsContext *sws_getCachedContext(struct SwsContext *context,
int srcW, int srcH, int srcFormat,
int dstW, int dstH, int dstFormat, int flags,
SwsFilter *srcFilter, SwsFilter *dstFilter, double *param);
#ifdef __cplusplus
}
#endif