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-rw-r--r--libswscale/swscale.c13
-rw-r--r--libswscale/swscale_internal.h10
-rw-r--r--libswscale/utils.c54
-rw-r--r--libswscale/version.h2
4 files changed, 67 insertions, 12 deletions
diff --git a/libswscale/swscale.c b/libswscale/swscale.c
index e54d448..16a31ce 100644
--- a/libswscale/swscale.c
+++ b/libswscale/swscale.c
@@ -27,6 +27,7 @@
#include "libavutil/avutil.h"
#include "libavutil/bswap.h"
#include "libavutil/cpu.h"
+#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/pixdesc.h"
@@ -899,6 +900,18 @@ int attribute_align_arg sws_scale(struct SwsContext *c,
av_log(c, AV_LOG_ERROR, "One of the input parameters to sws_scale() is NULL, please check the calling code\n");
return 0;
}
+ if (c->cascaded_context[0] && srcSliceY == 0 && srcSliceH == c->cascaded_context[0]->srcH) {
+ ret = sws_scale(c->cascaded_context[0],
+ srcSlice, srcStride, srcSliceY, srcSliceH,
+ c->cascaded_tmp, c->cascaded_tmpStride);
+ if (ret < 0)
+ return ret;
+ ret = sws_scale(c->cascaded_context[1],
+ (const uint8_t * const * )c->cascaded_tmp, c->cascaded_tmpStride, 0, c->cascaded_context[0]->dstH,
+ dst, dstStride);
+ return ret;
+ }
+
memcpy(src2, srcSlice, sizeof(src2));
memcpy(dst2, dst, sizeof(dst2));
diff --git a/libswscale/swscale_internal.h b/libswscale/swscale_internal.h
index 1e53690..63b4eca 100644
--- a/libswscale/swscale_internal.h
+++ b/libswscale/swscale_internal.h
@@ -61,6 +61,8 @@
# define APCK_SIZE 16
#endif
+#define RETCODE_USE_CASCADE -12345
+
struct SwsContext;
typedef enum SwsDither {
@@ -301,6 +303,14 @@ typedef struct SwsContext {
int sliceDir; ///< Direction that slices are fed to the scaler (1 = top-to-bottom, -1 = bottom-to-top).
double param[2]; ///< Input parameters for scaling algorithms that need them.
+ /* The cascaded_* fields allow spliting a scaler task into multiple
+ * sequential steps, this is for example used to limit the maximum
+ * downscaling factor that needs to be supported in one scaler.
+ */
+ struct SwsContext *cascaded_context[2];
+ int cascaded_tmpStride[4];
+ uint8_t *cascaded_tmp[4];
+
uint32_t pal_yuv[256];
uint32_t pal_rgb[256];
diff --git a/libswscale/utils.c b/libswscale/utils.c
index dfdeb38..5904ef8 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -42,6 +42,7 @@
#include "libavutil/avutil.h"
#include "libavutil/bswap.h"
#include "libavutil/cpu.h"
+#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
@@ -571,8 +572,7 @@ static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
goto fail;
if (filterSize >= MAX_FILTER_SIZE * 16 /
((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16)) {
- av_log(NULL, AV_LOG_ERROR, "sws: filterSize %d is too large, try less extreme scaling or set --sws-max-filter-size and recompile\n",
- FF_CEIL_RSHIFT((filterSize+1) * ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16), 4));
+ ret = RETCODE_USE_CASCADE;
goto fail;
}
*outFilterSize = filterSize;
@@ -664,7 +664,7 @@ static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
fail:
if(ret < 0)
- av_log(NULL, AV_LOG_ERROR, "sws: initFilter failed\n");
+ av_log(NULL, ret == RETCODE_USE_CASCADE ? AV_LOG_DEBUG : AV_LOG_ERROR, "sws: initFilter failed\n");
av_free(filter);
av_free(filter2);
return ret;
@@ -959,6 +959,7 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
enum AVPixelFormat dstFormat = c->dstFormat;
const AVPixFmtDescriptor *desc_src;
const AVPixFmtDescriptor *desc_dst;
+ int ret = 0;
cpu_flags = av_get_cpu_flags();
flags = c->flags;
@@ -1284,23 +1285,23 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
const int filterAlign = X86_MMX(cpu_flags) ? 4 :
PPC_ALTIVEC(cpu_flags) ? 8 : 1;
- if (initFilter(&c->hLumFilter, &c->hLumFilterPos,
+ if ((ret = initFilter(&c->hLumFilter, &c->hLumFilterPos,
&c->hLumFilterSize, c->lumXInc,
srcW, dstW, filterAlign, 1 << 14,
(flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
cpu_flags, srcFilter->lumH, dstFilter->lumH,
c->param,
get_local_pos(c, 0, 0, 0),
- get_local_pos(c, 0, 0, 0)) < 0)
+ get_local_pos(c, 0, 0, 0))) < 0)
goto fail;
- if (initFilter(&c->hChrFilter, &c->hChrFilterPos,
+ if ((ret = initFilter(&c->hChrFilter, &c->hChrFilterPos,
&c->hChrFilterSize, c->chrXInc,
c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,
(flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
cpu_flags, srcFilter->chrH, dstFilter->chrH,
c->param,
get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),
- get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0)) < 0)
+ get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0))) < 0)
goto fail;
}
} // initialize horizontal stuff
@@ -1310,22 +1311,22 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
const int filterAlign = X86_MMX(cpu_flags) ? 2 :
PPC_ALTIVEC(cpu_flags) ? 8 : 1;
- if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,
+ if ((ret = initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,
c->lumYInc, srcH, dstH, filterAlign, (1 << 12),
(flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
cpu_flags, srcFilter->lumV, dstFilter->lumV,
c->param,
get_local_pos(c, 0, 0, 1),
- get_local_pos(c, 0, 0, 1)) < 0)
+ get_local_pos(c, 0, 0, 1))) < 0)
goto fail;
- if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,
+ if ((ret = initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,
c->chrYInc, c->chrSrcH, c->chrDstH,
filterAlign, (1 << 12),
(flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
cpu_flags, srcFilter->chrV, dstFilter->chrV,
c->param,
get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),
- get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1)) < 0)
+ get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1))) < 0)
goto fail;
@@ -1479,6 +1480,32 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
c->swscale = ff_getSwsFunc(c);
return 0;
fail: // FIXME replace things by appropriate error codes
+ if (ret == RETCODE_USE_CASCADE) {
+ int tmpW = sqrt(srcW * (int64_t)dstW);
+ int tmpH = sqrt(srcH * (int64_t)dstH);
+ enum AVPixelFormat tmpFormat = AV_PIX_FMT_YUV420P;
+
+ if (srcW*(int64_t)srcH <= 4LL*dstW*dstH)
+ return AVERROR(EINVAL);
+
+ ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
+ tmpW, tmpH, tmpFormat, 64);
+ if (ret < 0)
+ return ret;
+
+ c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,
+ tmpW, tmpH, tmpFormat,
+ flags, srcFilter, NULL, c->param);
+ if (!c->cascaded_context[0])
+ return -1;
+
+ c->cascaded_context[1] = sws_getContext(tmpW, tmpH, tmpFormat,
+ dstW, dstH, dstFormat,
+ flags, NULL, dstFilter, c->param);
+ if (!c->cascaded_context[1])
+ return -1;
+ return 0;
+ }
return -1;
}
@@ -1890,6 +1917,11 @@ void sws_freeContext(SwsContext *c)
av_freep(&c->yuvTable);
av_freep(&c->formatConvBuffer);
+ sws_freeContext(c->cascaded_context[0]);
+ sws_freeContext(c->cascaded_context[1]);
+ memset(c->cascaded_context, 0, sizeof(c->cascaded_context));
+ av_freep(&c->cascaded_tmp[0]);
+
av_free(c);
}
diff --git a/libswscale/version.h b/libswscale/version.h
index ff7de29..228c577 100644
--- a/libswscale/version.h
+++ b/libswscale/version.h
@@ -28,7 +28,7 @@
#define LIBSWSCALE_VERSION_MAJOR 3
#define LIBSWSCALE_VERSION_MINOR 1
-#define LIBSWSCALE_VERSION_MICRO 100
+#define LIBSWSCALE_VERSION_MICRO 101
#define LIBSWSCALE_VERSION_INT AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \
LIBSWSCALE_VERSION_MINOR, \
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