X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libswscale%2Fswscale_internal.h;h=bb3b52d8c921d92edb291eac23095677e3f2dab0;hb=44b0edda3f4f8006c16e1b124199cafaf6363f3d;hp=9967c99edacdb4eb618299de50e235a864d7c2db;hpb=97535ffb9795f59c4fbfacfe1541d752ed47218e;p=ffmpeg diff --git a/libswscale/swscale_internal.h b/libswscale/swscale_internal.h index 9967c99edac..bb3b52d8c92 100644 --- a/libswscale/swscale_internal.h +++ b/libswscale/swscale_internal.h @@ -28,6 +28,9 @@ #endif #include "libavutil/avutil.h" +#include "libavutil/log.h" +#include "libavutil/pixfmt.h" +#include "libavutil/pixdesc.h" #define STR(s) AV_TOSTRING(s) //AV_STRINGIFY is too long @@ -57,40 +60,155 @@ typedef int (*SwsFunc)(struct SwsContext *context, const uint8_t* src[], int srcStride[], int srcSliceY, int srcSliceH, uint8_t* dst[], int dstStride[]); -typedef void (*yuv2planar1_fn) (struct SwsContext *c, - const int16_t *lumSrc, const int16_t *chrUSrc, - const int16_t *chrVSrc, const int16_t *alpSrc, - uint8_t *dest, - uint8_t *uDest, uint8_t *vDest, uint8_t *aDest, - int dstW, int chrDstW); -typedef void (*yuv2planarX_fn) (struct SwsContext *c, - const int16_t *lumFilter, const int16_t **lumSrc, int lumFilterSize, - const int16_t *chrFilter, const int16_t **chrUSrc, - const int16_t **chrVSrc, int chrFilterSize, - const int16_t **alpSrc, - uint8_t *dest, - uint8_t *uDest, uint8_t *vDest, uint8_t *aDest, - int dstW, int chrDstW); -typedef void (*yuv2packed1_fn) (struct SwsContext *c, - const uint16_t *buf0, - const uint16_t *ubuf0, const uint16_t *ubuf1, - const uint16_t *vbuf0, const uint16_t *vbuf1, - const uint16_t *abuf0, - uint8_t *dest, - int dstW, int uvalpha, int dstFormat, int flags, int y); -typedef void (*yuv2packed2_fn) (struct SwsContext *c, - const uint16_t *buf0, const uint16_t *buf1, - const uint16_t *ubuf0, const uint16_t *ubuf1, - const uint16_t *vbuf0, const uint16_t *vbuf1, - const uint16_t *abuf0, const uint16_t *abuf1, - uint8_t *dest, + +/** + * Write one line of horizontally scaled data to planar output + * without any additional vertical scaling (or point-scaling). + * + * @param src scaled source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param dest pointer to the output plane. For >8bit + * output, this is in uint16_t + * @param dstW width of destination in pixels + * @param dither ordered dither array of type int16_t and size 8 + * @param offset Dither offset + */ +typedef void (*yuv2planar1_fn) (const int16_t *src, uint8_t *dest, int dstW, + const uint8_t *dither, int offset); + +/** + * Write one line of horizontally scaled data to planar output + * with multi-point vertical scaling between input pixels. + * + * @param filter vertical luma/alpha scaling coefficients, 12bit [0,4096] + * @param src scaled luma (Y) or alpha (A) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param filterSize number of vertical input lines to scale + * @param dest pointer to output plane. For >8bit + * output, this is in uint16_t + * @param dstW width of destination pixels + * @param offset Dither offset + */ +typedef void (*yuv2planarX_fn) (const int16_t *filter, int filterSize, + const int16_t **src, uint8_t *dest, int dstW, + const uint8_t *dither, int offset); + +/** + * Write one line of horizontally scaled chroma to interleaved output + * with multi-point vertical scaling between input pixels. + * + * @param c SWS scaling context + * @param chrFilter vertical chroma scaling coefficients, 12bit [0,4096] + * @param chrUSrc scaled chroma (U) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param chrVSrc scaled chroma (V) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param chrFilterSize number of vertical chroma input lines to scale + * @param dest pointer to the output plane. For >8bit + * output, this is in uint16_t + * @param dstW width of chroma planes + */ +typedef void (*yuv2interleavedX_fn) (struct SwsContext *c, const int16_t *chrFilter, int chrFilterSize, + const int16_t **chrUSrc, const int16_t **chrVSrc, + uint8_t *dest, int dstW); + +/** + * Write one line of horizontally scaled Y/U/V/A to packed-pixel YUV/RGB + * output without any additional vertical scaling (or point-scaling). Note + * that this function may do chroma scaling, see the "uvalpha" argument. + * + * @param c SWS scaling context + * @param lumSrc scaled luma (Y) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param chrUSrc scaled chroma (U) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param chrVSrc scaled chroma (V) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param alpSrc scaled alpha (A) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param dest pointer to the output plane. For 16bit output, this is + * uint16_t + * @param dstW width of lumSrc and alpSrc in pixels, number of pixels + * to write into dest[] + * @param uvalpha chroma scaling coefficient for the second line of chroma + * pixels, either 2048 or 0. If 0, one chroma input is used + * for 2 output pixels (or if the SWS_FLAG_FULL_CHR_INT flag + * is set, it generates 1 output pixel). If 2048, two chroma + * input pixels should be averaged for 2 output pixels (this + * only happens if SWS_FLAG_FULL_CHR_INT is not set) + * @param y vertical line number for this output. This does not need + * to be used to calculate the offset in the destination, + * but can be used to generate comfort noise using dithering + * for some output formats. + */ +typedef void (*yuv2packed1_fn) (struct SwsContext *c, const int16_t *lumSrc, + const int16_t *chrUSrc[2], const int16_t *chrVSrc[2], + const int16_t *alpSrc, uint8_t *dest, + int dstW, int uvalpha, int y); +/** + * Write one line of horizontally scaled Y/U/V/A to packed-pixel YUV/RGB + * output by doing bilinear scaling between two input lines. + * + * @param c SWS scaling context + * @param lumSrc scaled luma (Y) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param chrUSrc scaled chroma (U) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param chrVSrc scaled chroma (V) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param alpSrc scaled alpha (A) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param dest pointer to the output plane. For 16bit output, this is + * uint16_t + * @param dstW width of lumSrc and alpSrc in pixels, number of pixels + * to write into dest[] + * @param yalpha luma/alpha scaling coefficients for the second input line. + * The first line's coefficients can be calculated by using + * 4096 - yalpha + * @param uvalpha chroma scaling coefficient for the second input line. The + * first line's coefficients can be calculated by using + * 4096 - uvalpha + * @param y vertical line number for this output. This does not need + * to be used to calculate the offset in the destination, + * but can be used to generate comfort noise using dithering + * for some output formats. + */ +typedef void (*yuv2packed2_fn) (struct SwsContext *c, const int16_t *lumSrc[2], + const int16_t *chrUSrc[2], const int16_t *chrVSrc[2], + const int16_t *alpSrc[2], uint8_t *dest, int dstW, int yalpha, int uvalpha, int y); -typedef void (*yuv2packedX_fn) (struct SwsContext *c, - const int16_t *lumFilter, const int16_t **lumSrc, int lumFilterSize, +/** + * Write one line of horizontally scaled Y/U/V/A to packed-pixel YUV/RGB + * output by doing multi-point vertical scaling between input pixels. + * + * @param c SWS scaling context + * @param lumFilter vertical luma/alpha scaling coefficients, 12bit [0,4096] + * @param lumSrc scaled luma (Y) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param lumFilterSize number of vertical luma/alpha input lines to scale + * @param chrFilter vertical chroma scaling coefficients, 12bit [0,4096] + * @param chrUSrc scaled chroma (U) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param chrVSrc scaled chroma (V) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param chrFilterSize number of vertical chroma input lines to scale + * @param alpSrc scaled alpha (A) source data, 15bit for 8-10bit output, + * 19-bit for 16bit output (in int32_t) + * @param dest pointer to the output plane. For 16bit output, this is + * uint16_t + * @param dstW width of lumSrc and alpSrc in pixels, number of pixels + * to write into dest[] + * @param y vertical line number for this output. This does not need + * to be used to calculate the offset in the destination, + * but can be used to generate comfort noise using dithering + * or some output formats. + */ +typedef void (*yuv2packedX_fn) (struct SwsContext *c, const int16_t *lumFilter, + const int16_t **lumSrc, int lumFilterSize, const int16_t *chrFilter, const int16_t **chrUSrc, const int16_t **chrVSrc, int chrFilterSize, const int16_t **alpSrc, uint8_t *dest, - int dstW, int dstY); + int dstW, int y); /* This struct should be aligned on at least a 32-byte boundary. */ typedef struct SwsContext { @@ -117,6 +235,7 @@ typedef struct SwsContext { enum PixelFormat srcFormat; ///< Source pixel format. int dstFormatBpp; ///< Number of bits per pixel of the destination pixel format. int srcFormatBpp; ///< Number of bits per pixel of the source pixel format. + int dstBpc, srcBpc; int chrSrcHSubSample; ///< Binary logarithm of horizontal subsampling factor between luma/alpha and chroma planes in source image. int chrSrcVSubSample; ///< Binary logarithm of vertical subsampling factor between luma/alpha and chroma planes in source image. int chrDstHSubSample; ///< Binary logarithm of horizontal subsampling factor between luma/alpha and chroma planes in destination image. @@ -228,8 +347,10 @@ typedef struct SwsContext { #define V_TEMP "11*8+4*4*256*2+32" #define Y_TEMP "11*8+4*4*256*2+40" #define ALP_MMX_FILTER_OFFSET "11*8+4*4*256*2+48" -#define UV_OFF "11*8+4*4*256*3+48" -#define UV_OFFx2 "11*8+4*4*256*3+56" +#define UV_OFF_PX "11*8+4*4*256*3+48" +#define UV_OFF_BYTE "11*8+4*4*256*3+56" +#define DITHER16 "11*8+4*4*256*3+64" +#define DITHER32 "11*8+4*4*256*3+80" DECLARE_ALIGNED(8, uint64_t, redDither); DECLARE_ALIGNED(8, uint64_t, greenDither); @@ -252,8 +373,15 @@ typedef struct SwsContext { DECLARE_ALIGNED(8, uint64_t, v_temp); DECLARE_ALIGNED(8, uint64_t, y_temp); int32_t alpMmxFilter[4*MAX_FILTER_SIZE]; - DECLARE_ALIGNED(8, ptrdiff_t, uv_off); ///< offset (in pixels) between u and v planes - DECLARE_ALIGNED(8, ptrdiff_t, uv_offx2); ///< offset (in bytes) between u and v planes + // alignment of these values is not necessary, but merely here + // to maintain the same offset across x8632 and x86-64. Once we + // use proper offset macros in the asm, they can be removed. + DECLARE_ALIGNED(8, ptrdiff_t, uv_off_px); ///< offset (in pixels) between u and v planes + DECLARE_ALIGNED(8, ptrdiff_t, uv_off_byte); ///< offset (in bytes) between u and v planes + DECLARE_ALIGNED(8, uint16_t, dither16)[8]; + DECLARE_ALIGNED(8, uint32_t, dither32)[8]; + + const uint8_t *chrDither8, *lumDither8; #if HAVE_ALTIVEC vector signed short CY; @@ -285,8 +413,9 @@ typedef struct SwsContext { #endif /* function pointers for swScale() */ - yuv2planar1_fn yuv2yuv1; - yuv2planarX_fn yuv2yuvX; + yuv2planar1_fn yuv2plane1; + yuv2planarX_fn yuv2planeX; + yuv2interleavedX_fn yuv2nv12cX; yuv2packed1_fn yuv2packed1; yuv2packed2_fn yuv2packed2; yuv2packedX_fn yuv2packedX; @@ -298,6 +427,35 @@ typedef struct SwsContext { void (*chrToYV12)(uint8_t *dstU, uint8_t *dstV, const uint8_t *src1, const uint8_t *src2, int width, uint32_t *pal); ///< Unscaled conversion of chroma planes to YV12 for horizontal scaler. + + /** + * Functions to read planar input, such as planar RGB, and convert + * internally to Y/UV. + */ + /** @{ */ + void (*readLumPlanar)(uint8_t *dst, const uint8_t *src[4], int width); + void (*readChrPlanar)(uint8_t *dstU, uint8_t *dstV, const uint8_t *src[4], int width); + /** @} */ + + /** + * Scale one horizontal line of input data using a bilinear filter + * to produce one line of output data. Compared to SwsContext->hScale(), + * please take note of the following caveats when using these: + * - Scaling is done using only 7bit instead of 14bit coefficients. + * - You can use no more than 5 input pixels to produce 4 output + * pixels. Therefore, this filter should not be used for downscaling + * by more than ~20% in width (because that equals more than 5/4th + * downscaling and thus more than 5 pixels input per 4 pixels output). + * - In general, bilinear filters create artifacts during downscaling + * (even when <20%), because one output pixel will span more than one + * input pixel, and thus some pixels will need edges of both neighbor + * pixels to interpolate the output pixel. Since you can use at most + * two input pixels per output pixel in bilinear scaling, this is + * impossible and thus downscaling by any size will create artifacts. + * To enable this type of scaling, set SWS_FLAG_FAST_BILINEAR + * in SwsContext->flags. + */ + /** @{ */ void (*hyscale_fast)(struct SwsContext *c, int16_t *dst, int dstWidth, const uint8_t *src, int srcW, int xInc); @@ -305,10 +463,46 @@ typedef struct SwsContext { int16_t *dst1, int16_t *dst2, int dstWidth, const uint8_t *src1, const uint8_t *src2, int srcW, int xInc); + /** @} */ - void (*hScale)(int16_t *dst, int dstW, const uint8_t *src, - const int16_t *filter, const int16_t *filterPos, - int filterSize); + /** + * Scale one horizontal line of input data using a filter over the input + * lines, to produce one (differently sized) line of output data. + * + * @param dst pointer to destination buffer for horizontally scaled + * data. If the number of bits per component of one + * destination pixel (SwsContext->dstBpc) is <= 10, data + * will be 15bpc in 16bits (int16_t) width. Else (i.e. + * SwsContext->dstBpc == 16), data will be 19bpc in + * 32bits (int32_t) width. + * @param dstW width of destination image + * @param src pointer to source data to be scaled. If the number of + * bits per component of a source pixel (SwsContext->srcBpc) + * is 8, this is 8bpc in 8bits (uint8_t) width. Else + * (i.e. SwsContext->dstBpc > 8), this is native depth + * in 16bits (uint16_t) width. In other words, for 9-bit + * YUV input, this is 9bpc, for 10-bit YUV input, this is + * 10bpc, and for 16-bit RGB or YUV, this is 16bpc. + * @param filter filter coefficients to be used per output pixel for + * scaling. This contains 14bpp filtering coefficients. + * Guaranteed to contain dstW * filterSize entries. + * @param filterPos position of the first input pixel to be used for + * each output pixel during scaling. Guaranteed to + * contain dstW entries. + * @param filterSize the number of input coefficients to be used (and + * thus the number of input pixels to be used) for + * creating a single output pixel. Is aligned to 4 + * (and input coefficients thus padded with zeroes) + * to simplify creating SIMD code. + */ + /** @{ */ + void (*hyScale)(struct SwsContext *c, int16_t *dst, int dstW, const uint8_t *src, + const int16_t *filter, const int16_t *filterPos, + int filterSize); + void (*hcScale)(struct SwsContext *c, int16_t *dst, int dstW, const uint8_t *src, + const int16_t *filter, const int16_t *filterPos, + int filterSize); + /** @} */ void (*lumConvertRange)(int16_t *dst, int width); ///< Color range conversion function for luma plane if needed. void (*chrConvertRange)(int16_t *dst1, int16_t *dst2, int width); ///< Color range conversion function for chroma planes if needed. @@ -337,79 +531,40 @@ void ff_bfin_get_unscaled_swscale(SwsContext *c); const char *sws_format_name(enum PixelFormat format); -//FIXME replace this with something faster -#define is16BPS(x) ( \ - (x)==PIX_FMT_GRAY16BE \ - || (x)==PIX_FMT_GRAY16LE \ - || (x)==PIX_FMT_BGR48BE \ - || (x)==PIX_FMT_BGR48LE \ - || (x)==PIX_FMT_RGB48BE \ - || (x)==PIX_FMT_RGB48LE \ - || (x)==PIX_FMT_YUV420P16LE \ - || (x)==PIX_FMT_YUV422P16LE \ - || (x)==PIX_FMT_YUV444P16LE \ - || (x)==PIX_FMT_YUV420P16BE \ - || (x)==PIX_FMT_YUV422P16BE \ - || (x)==PIX_FMT_YUV444P16BE \ - ) -#define is9_OR_10BPS(x) ( \ - (x)==PIX_FMT_YUV420P9LE \ - || (x)==PIX_FMT_YUV420P9BE \ - || (x)==PIX_FMT_YUV444P9BE \ - || (x)==PIX_FMT_YUV444P9LE \ - || (x)==PIX_FMT_YUV422P10BE \ - || (x)==PIX_FMT_YUV422P10LE \ - || (x)==PIX_FMT_YUV444P10BE \ - || (x)==PIX_FMT_YUV444P10LE \ - || (x)==PIX_FMT_YUV420P10LE \ - || (x)==PIX_FMT_YUV420P10BE \ - ) -#define isBE(x) ((x)&1) -#define isPlanar8YUV(x) ( \ - (x)==PIX_FMT_YUV410P \ - || (x)==PIX_FMT_YUV420P \ - || (x)==PIX_FMT_YUVA420P \ - || (x)==PIX_FMT_YUV411P \ - || (x)==PIX_FMT_YUV422P \ - || (x)==PIX_FMT_YUV444P \ - || (x)==PIX_FMT_YUV440P \ - || (x)==PIX_FMT_NV12 \ - || (x)==PIX_FMT_NV21 \ - ) -#define isPlanarYUV(x) ( \ - isPlanar8YUV(x) \ - || (x)==PIX_FMT_YUV420P9LE \ - || (x)==PIX_FMT_YUV444P9LE \ - || (x)==PIX_FMT_YUV420P10LE \ - || (x)==PIX_FMT_YUV422P10LE \ - || (x)==PIX_FMT_YUV444P10LE \ - || (x)==PIX_FMT_YUV420P16LE \ - || (x)==PIX_FMT_YUV422P16LE \ - || (x)==PIX_FMT_YUV444P16LE \ - || (x)==PIX_FMT_YUV420P9BE \ - || (x)==PIX_FMT_YUV444P9BE \ - || (x)==PIX_FMT_YUV420P10BE \ - || (x)==PIX_FMT_YUV422P10BE \ - || (x)==PIX_FMT_YUV444P10BE \ - || (x)==PIX_FMT_YUV420P16BE \ - || (x)==PIX_FMT_YUV422P16BE \ - || (x)==PIX_FMT_YUV444P16BE \ - ) -#define isYUV(x) ( \ - (x)==PIX_FMT_UYVY422 \ - || (x)==PIX_FMT_YUYV422 \ - || isPlanarYUV(x) \ - ) +#define is16BPS(x) \ + (av_pix_fmt_descriptors[x].comp[0].depth_minus1 == 15) + +#define is9_OR_10BPS(x) \ + (av_pix_fmt_descriptors[x].comp[0].depth_minus1 == 8 || \ + av_pix_fmt_descriptors[x].comp[0].depth_minus1 == 9) + +#define isBE(x) \ + (av_pix_fmt_descriptors[x].flags & PIX_FMT_BE) + +#define isYUV(x) \ + (!(av_pix_fmt_descriptors[x].flags & PIX_FMT_RGB) && \ + av_pix_fmt_descriptors[x].nb_components >= 2) + +#define isPlanarYUV(x) \ + ((av_pix_fmt_descriptors[x].flags & PIX_FMT_PLANAR) && \ + isYUV(x)) + +#define isRGB(x) \ + (av_pix_fmt_descriptors[x].flags & PIX_FMT_RGB) + +#if 0 // FIXME +#define isGray(x) \ + (!(av_pix_fmt_descriptors[x].flags & PIX_FMT_PAL) && \ + av_pix_fmt_descriptors[x].nb_components <= 2) +#else #define isGray(x) ( \ (x)==PIX_FMT_GRAY8 \ || (x)==PIX_FMT_Y400A \ || (x)==PIX_FMT_GRAY16BE \ || (x)==PIX_FMT_GRAY16LE \ ) -#define isGray16(x) ( \ - (x)==PIX_FMT_GRAY16BE \ - || (x)==PIX_FMT_GRAY16LE \ - ) +#endif + #define isRGBinInt(x) ( \ (x)==PIX_FMT_RGB48BE \ || (x)==PIX_FMT_RGB48LE \ @@ -446,39 +601,24 @@ const char *sws_format_name(enum PixelFormat format); || (x)==PIX_FMT_MONOBLACK \ || (x)==PIX_FMT_MONOWHITE \ ) -#define isRGBinBytes(x) ( \ - (x)==PIX_FMT_RGB48BE \ - || (x)==PIX_FMT_RGB48LE \ - || (x)==PIX_FMT_RGBA \ - || (x)==PIX_FMT_ARGB \ - || (x)==PIX_FMT_RGB24 \ - ) -#define isBGRinBytes(x) ( \ - (x)==PIX_FMT_BGR48BE \ - || (x)==PIX_FMT_BGR48LE \ - || (x)==PIX_FMT_BGRA \ - || (x)==PIX_FMT_ABGR \ - || (x)==PIX_FMT_BGR24 \ - ) #define isAnyRGB(x) ( \ isRGBinInt(x) \ || isBGRinInt(x) \ ) -#define isALPHA(x) ( \ - (x)==PIX_FMT_BGR32 \ - || (x)==PIX_FMT_BGR32_1 \ - || (x)==PIX_FMT_RGB32 \ - || (x)==PIX_FMT_RGB32_1 \ - || (x)==PIX_FMT_Y400A \ - || (x)==PIX_FMT_YUVA420P \ - ) -#define isPacked(x) ( \ - (x)==PIX_FMT_PAL8 \ - || (x)==PIX_FMT_YUYV422 \ - || (x)==PIX_FMT_UYVY422 \ - || (x)==PIX_FMT_Y400A \ - || isAnyRGB(x) \ +#define isALPHA(x) \ + (av_pix_fmt_descriptors[x].nb_components == 2 || \ + av_pix_fmt_descriptors[x].nb_components == 4) + +#define isPacked(x) (\ + (av_pix_fmt_descriptors[x].nb_components >= 2 && \ + !(av_pix_fmt_descriptors[x].flags & PIX_FMT_PLANAR)) || \ + (x) == PIX_FMT_PAL8\ ) + +#define isPlanar(x) \ + (av_pix_fmt_descriptors[x].nb_components >= 2 && \ + (av_pix_fmt_descriptors[x].flags & PIX_FMT_PLANAR)) + #define usePal(x) ((av_pix_fmt_descriptors[x].flags & PIX_FMT_PAL) || (x) == PIX_FMT_Y400A) extern const uint64_t ff_dither4[2]; @@ -487,7 +627,7 @@ extern const uint64_t ff_dither8[2]; extern const AVClass sws_context_class; /** - * Sets c->swScale to an unscaled converter if one exists for the specific + * Set c->swScale to an unscaled converter if one exists for the specific * source and destination formats, bit depths, flags, etc. */ void ff_get_unscaled_swscale(SwsContext *c); @@ -495,7 +635,7 @@ void ff_get_unscaled_swscale(SwsContext *c); void ff_swscale_get_unscaled_altivec(SwsContext *c); /** - * Returns function pointer to fastest main scaler path function depending + * Return function pointer to fastest main scaler path function depending * on architecture and available optimizations. */ SwsFunc ff_getSwsFunc(SwsContext *c);