mirror of https://git.ffmpeg.org/ffmpeg.git
Introduce swscale interface in libavcodec
Originally committed as revision 5266 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Luca Abeni
parent
703c8195a8
commit
7b748aff2c
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@ -23,6 +23,7 @@
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*/
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#include "avcodec.h"
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#include "swscale.h"
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#include "dsputil.h"
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#ifdef USE_FASTMEMCPY
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@ -630,6 +631,140 @@ void img_resample_close(ImgReSampleContext *s)
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av_free(s);
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}
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struct SwsContext *sws_getContext(int srcW, int srcH, int srcFormat,
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int dstW, int dstH, int dstFormat,
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int flags, SwsFilter *srcFilter,
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SwsFilter *dstFilter, double *param)
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{
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struct SwsContext *ctx;
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ctx = av_malloc(sizeof(struct SwsContext));
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if (ctx == NULL) {
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av_log(NULL, AV_LOG_ERROR, "Cannot allocate a resampling context!\n");
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return NULL;
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}
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if ((srcH != dstH) || (srcW != dstW)) {
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if ((srcFormat != PIX_FMT_YUV420P) || (dstFormat != PIX_FMT_YUV420P)) {
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av_log(NULL, AV_LOG_INFO, "PIX_FMT_YUV420P will be used as an intermediate format for rescaling\n");
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}
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ctx->resampling_ctx = img_resample_init(dstW, dstH, srcW, srcH);
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} else {
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ctx->resampling_ctx = av_malloc(sizeof(ImgReSampleContext));
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ctx->resampling_ctx->iheight = srcH;
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ctx->resampling_ctx->iwidth = srcW;
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ctx->resampling_ctx->oheight = dstH;
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ctx->resampling_ctx->owidth = dstW;
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}
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ctx->src_pix_fmt = srcFormat;
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ctx->dst_pix_fmt = dstFormat;
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return ctx;
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}
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void sws_freeContext(struct SwsContext *ctx)
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{
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if ((ctx->resampling_ctx->iwidth != ctx->resampling_ctx->owidth) ||
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(ctx->resampling_ctx->iheight != ctx->resampling_ctx->oheight)) {
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img_resample_close(ctx->resampling_ctx);
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} else {
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av_free(ctx->resampling_ctx);
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}
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av_free(ctx);
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}
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int sws_scale(struct SwsContext *ctx, uint8_t* src[], int srcStride[],
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int srcSliceY, int srcSliceH, uint8_t* dst[], int dstStride[])
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{
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AVPicture src_pict, dst_pict;
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int i, res = 0;
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AVPicture picture_format_temp;
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AVPicture picture_resample_temp, *formatted_picture, *resampled_picture;
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uint8_t *buf1 = NULL, *buf2 = NULL;
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enum PixelFormat current_pix_fmt;
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for (i = 0; i < 3; i++) {
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src_pict.data[i] = src[i];
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src_pict.linesize[i] = srcStride[i];
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dst_pict.data[i] = dst[i];
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dst_pict.linesize[i] = dstStride[i];
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}
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if ((ctx->resampling_ctx->iwidth != ctx->resampling_ctx->owidth) ||
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(ctx->resampling_ctx->iheight != ctx->resampling_ctx->oheight)) {
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/* We have to rescale the picture, but only YUV420P rescaling is supported... */
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if (ctx->src_pix_fmt != PIX_FMT_YUV420P) {
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int size;
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/* create temporary picture for rescaling input*/
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size = avpicture_get_size(PIX_FMT_YUV420P, ctx->resampling_ctx->iwidth, ctx->resampling_ctx->iheight);
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buf1 = av_malloc(size);
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if (!buf1) {
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res = -1;
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goto the_end;
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}
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formatted_picture = &picture_format_temp;
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avpicture_fill((AVPicture*)formatted_picture, buf1,
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PIX_FMT_YUV420P, ctx->resampling_ctx->iwidth, ctx->resampling_ctx->iheight);
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if (img_convert((AVPicture*)formatted_picture, PIX_FMT_YUV420P,
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&src_pict, ctx->src_pix_fmt,
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ctx->resampling_ctx->iwidth, ctx->resampling_ctx->iheight) < 0) {
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av_log(NULL, AV_LOG_ERROR, "pixel format conversion not handled\n");
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res = -1;
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goto the_end;
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}
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} else {
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formatted_picture = &src_pict;
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}
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if (ctx->dst_pix_fmt != PIX_FMT_YUV420P) {
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int size;
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/* create temporary picture for rescaling output*/
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size = avpicture_get_size(PIX_FMT_YUV420P, ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight);
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buf2 = av_malloc(size);
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if (!buf2) {
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res = -1;
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goto the_end;
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}
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resampled_picture = &picture_resample_temp;
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avpicture_fill((AVPicture*)resampled_picture, buf2,
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PIX_FMT_YUV420P, ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight);
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} else {
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resampled_picture = &dst_pict;
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}
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/* ...and finally rescale!!! */
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img_resample(ctx->resampling_ctx, resampled_picture, formatted_picture);
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current_pix_fmt = PIX_FMT_YUV420P;
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} else {
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resampled_picture = &src_pict;
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current_pix_fmt = ctx->src_pix_fmt;
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}
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if (current_pix_fmt != ctx->dst_pix_fmt) {
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if (img_convert(&dst_pict, ctx->dst_pix_fmt,
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resampled_picture, current_pix_fmt,
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ctx->resampling_ctx->owidth, ctx->resampling_ctx->oheight) < 0) {
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av_log(NULL, AV_LOG_ERROR, "pixel format conversion not handled\n");
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res = -1;
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goto the_end;
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}
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}
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the_end:
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av_free(buf1);
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av_free(buf2);
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return res;
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}
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#ifdef TEST
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#include <stdio.h>
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@ -0,0 +1,38 @@
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#ifndef SWSCALE_EMU_H
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#define SWSCALE_EMU_H
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/* Dummy, only useful for compilation! */
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#define SWS_FAST_BILINEAR 1
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#define SWS_BILINEAR 2
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#define SWS_BICUBIC 4
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#define SWS_X 8
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#define SWS_POINT 0x10
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#define SWS_AREA 0x20
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#define SWS_BICUBLIN 0x40
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#define SWS_GAUSS 0x80
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#define SWS_SINC 0x100
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#define SWS_LANCZOS 0x200
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#define SWS_SPLINE 0x400
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#define SwsFilter void
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struct SwsContext {
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struct ImgReSampleContext *resampling_ctx;
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enum PixelFormat src_pix_fmt, dst_pix_fmt;
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};
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struct SwsContext *sws_getContext(int srcW, int srcH, int srcFormat,
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int dstW, int dstH, int dstFormat,
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int flags, SwsFilter *srcFilter,
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SwsFilter *dstFilter, double *param);
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int sws_scale(struct SwsContext *ctx, uint8_t* src[], int srcStride[],
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int srcSliceY, int srcSliceH, uint8_t* dst[], int dstStride[]);
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void sws_freeContext(struct SwsContext *swsContext);
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static inline void sws_global_init(void *(*alloc)(unsigned int size),
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void (*free)(void *ptr),
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void (*log)(void*, int level, const char *fmt, ...))
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{
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}
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#endif /* SWSCALE_EMU_H */
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