diff options
Diffstat (limited to 'libavcodec/imgresample.c')
| -rw-r--r-- | libavcodec/imgresample.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/libavcodec/imgresample.c b/libavcodec/imgresample.c index 906fde3f2e..26de52d857 100644 --- a/libavcodec/imgresample.c +++ b/libavcodec/imgresample.c @@ -23,6 +23,7 @@ */ #include "avcodec.h" +#include "swscale.h" #include "dsputil.h" #ifdef USE_FASTMEMCPY @@ -630,6 +631,140 @@ void img_resample_close(ImgReSampleContext *s) av_free(s); } +struct SwsContext *sws_getContext(int srcW, int srcH, int srcFormat, + int dstW, int dstH, int dstFormat, + int flags, SwsFilter *srcFilter, + SwsFilter *dstFilter, double *param) +{ + struct SwsContext *ctx; + + ctx = av_malloc(sizeof(struct SwsContext)); + if (ctx == NULL) { + av_log(NULL, AV_LOG_ERROR, "Cannot allocate a resampling context!\n"); + + return NULL; + } + + if ((srcH != dstH) || (srcW != dstW)) { + if ((srcFormat != PIX_FMT_YUV420P) || (dstFormat != PIX_FMT_YUV420P)) { + av_log(NULL, AV_LOG_INFO, "PIX_FMT_YUV420P will be used as an intermediate format for rescaling\n"); + } + ctx->resampling_ctx = img_resample_init(dstW, dstH, srcW, srcH); + } else { + ctx->resampling_ctx = av_malloc(sizeof(ImgReSampleContext)); + ctx->resampling_ctx->iheight = srcH; + ctx->resampling_ctx->iwidth = srcW; + ctx->resampling_ctx->oheight = dstH; + ctx->resampling_ctx->owidth = dstW; + } + ctx->src_pix_fmt = srcFormat; + ctx->dst_pix_fmt = dstFormat; + + return ctx; +} + +void sws_freeContext(struct SwsContext *ctx) +{ + if ((ctx->resampling_ctx->iwidth != ctx->resampling_ctx->owidth) || + (ctx->resampling_ctx->iheight != ctx->resampling_ctx->oheight)) { + img_resample_close(ctx->resampling_ctx); + } else { + av_free(ctx->resampling_ctx); + } + av_free(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 < 3; 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; + } + } + +the_end: + av_free(buf1); + av_free(buf2); + return res; +} + + #ifdef TEST #include <stdio.h> |