+ 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[])
+{
+ AVPicture src_pict, dst_pict;
+ int i, res = 0;
+ AVPicture picture_format_temp;
+ AVPicture picture_resample_temp, *formatted_picture, *resampled_picture;
+ uint8_t *buf1 = NULL, *buf2 = NULL;
+ enum PixelFormat current_pix_fmt;
+
+ for (i = 0; i < 4; i++) {
+ src_pict.data[i] = src[i];
+ src_pict.linesize[i] = srcStride[i];
+ dst_pict.data[i] = dst[i];
+ dst_pict.linesize[i] = dstStride[i];
+ }
+ if ((ctx->resampling_ctx->iwidth != ctx->resampling_ctx->owidth) ||
+ (ctx->resampling_ctx->iheight != ctx->resampling_ctx->oheight)) {
+ /* We have to rescale the picture, but only YUV420P rescaling is supported... */
+
+ if (ctx->src_pix_fmt != PIX_FMT_YUV420P) {
+ int size;
+
+ /* create temporary picture for rescaling input*/
+ size = avpicture_get_size(PIX_FMT_YUV420P, ctx->resampling_ctx->iwidth, ctx->resampling_ctx->iheight);
+ buf1 = av_malloc(size);
+ if (!buf1) {
+ res = -1;
+ goto the_end;
+ }
+ formatted_picture = &picture_format_temp;
+ avpicture_fill((AVPicture*)formatted_picture, buf1,
+ PIX_FMT_YUV420P, ctx->resampling_ctx->iwidth, ctx->resampling_ctx->iheight);
+
+ if (img_convert((AVPicture*)formatted_picture, PIX_FMT_YUV420P,
+ &src_pict, ctx->src_pix_fmt,
+ ctx->resampling_ctx->iwidth, ctx->resampling_ctx->iheight) < 0) {
+
+ av_log(NULL, AV_LOG_ERROR, "pixel format conversion not handled\n");
+ res = -1;
+ goto the_end;
+ }
+ } else {
+ formatted_picture = &src_pict;
+ }
+
+ if (ctx->dst_pix_fmt != PIX_FMT_YUV420P) {
+ int size;
+
+ /* create temporary picture for rescaling output*/
+ size = avpicture_get_size(PIX_FMT_YUV420P, ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight);
+ buf2 = av_malloc(size);
+ if (!buf2) {
+ res = -1;
+ goto the_end;
+ }
+ resampled_picture = &picture_resample_temp;
+ avpicture_fill((AVPicture*)resampled_picture, buf2,
+ PIX_FMT_YUV420P, ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight);
+
+ } else {
+ resampled_picture = &dst_pict;
+ }
+
+ /* ...and finally rescale!!! */
+ img_resample(ctx->resampling_ctx, resampled_picture, formatted_picture);
+ current_pix_fmt = PIX_FMT_YUV420P;
+ } else {
+ resampled_picture = &src_pict;
+ current_pix_fmt = ctx->src_pix_fmt;
+ }
+
+ if (current_pix_fmt != ctx->dst_pix_fmt) {
+ if (img_convert(&dst_pict, ctx->dst_pix_fmt,
+ resampled_picture, current_pix_fmt,
+ ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight) < 0) {
+
+ av_log(NULL, AV_LOG_ERROR, "pixel format conversion not handled\n");
+
+ res = -1;
+ goto the_end;
+ }
+ } else if (resampled_picture != &dst_pict) {
+ av_picture_copy(&dst_pict, resampled_picture, current_pix_fmt,
+ ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight);
+ }
+
+the_end:
+ av_free(buf1);
+ av_free(buf2);
+ return res;