Move av_find_best_pix_fmt_of_2() from avcodec to avutil
This avoids a dependancy of libavfilter on libavcodec See Ticket 3592 Fixes Ticket2784 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
parent
8ff72924cf
commit
617e866e25
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@ -4690,30 +4690,8 @@ void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int
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*/
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unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
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#define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
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#define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
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#define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
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#define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
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#define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
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#define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
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/**
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* Compute what kind of losses will occur when converting from one specific
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* pixel format to another.
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* When converting from one pixel format to another, information loss may occur.
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* For example, when converting from RGB24 to GRAY, the color information will
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* be lost. Similarly, other losses occur when converting from some formats to
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* other formats. These losses can involve loss of chroma, but also loss of
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* resolution, loss of color depth, loss due to the color space conversion, loss
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* of the alpha bits or loss due to color quantization.
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* avcodec_get_fix_fmt_loss() informs you about the various types of losses
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* which will occur when converting from one pixel format to another.
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*
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* @param[in] dst_pix_fmt destination pixel format
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* @param[in] src_pix_fmt source pixel format
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* @param[in] has_alpha Whether the source pixel format alpha channel is used.
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* @return Combination of flags informing you what kind of losses will occur
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* (maximum loss for an invalid dst_pix_fmt).
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* @deprecated see av_get_pix_fmt_loss()
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*/
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int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
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int has_alpha);
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@ -4740,34 +4718,7 @@ enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *p
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int has_alpha, int *loss_ptr);
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/**
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* Find the best pixel format to convert to given a certain source pixel
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* format and a selection of two destination pixel formats. When converting from
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* one pixel format to another, information loss may occur. For example, when converting
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* from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
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* converting from some formats to other formats. avcodec_find_best_pix_fmt_of_2() selects which of
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* the given pixel formats should be used to suffer the least amount of loss.
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*
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* If one of the destination formats is AV_PIX_FMT_NONE the other pixel format (if valid) will be
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* returned.
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*
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* @code
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* src_pix_fmt = AV_PIX_FMT_YUV420P;
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* dst_pix_fmt1= AV_PIX_FMT_RGB24;
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* dst_pix_fmt2= AV_PIX_FMT_GRAY8;
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* dst_pix_fmt3= AV_PIX_FMT_RGB8;
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* loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
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* dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
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* dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
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* @endcode
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*
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* @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
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* @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
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* @param[in] src_pix_fmt Source pixel format
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* @param[in] has_alpha Whether the source pixel format alpha channel is used.
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* @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
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* NULL or value of zero means we care about all losses. Out: the loss
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* that occurs when converting from src to selected dst pixel format.
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* @return The best pixel format to convert to or -1 if none was found.
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* @deprecated see av_find_best_pix_fmt_of_2()
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*/
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enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
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enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
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@ -40,12 +40,6 @@
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#include "libavutil/pixdesc.h"
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#include "libavutil/imgutils.h"
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#define FF_COLOR_NA -1
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#define FF_COLOR_RGB 0 /**< RGB color space */
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#define FF_COLOR_GRAY 1 /**< gray color space */
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#define FF_COLOR_YUV 2 /**< YUV color space. 16 <= Y <= 235, 16 <= U, V <= 240 */
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#define FF_COLOR_YUV_JPEG 3 /**< YUV color space. 0 <= Y <= 255, 0 <= U, V <= 255 */
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#if HAVE_MMX_EXTERNAL
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#define deinterlace_line_inplace ff_deinterlace_line_inplace_mmx
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#define deinterlace_line ff_deinterlace_line_mmx
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@ -54,10 +48,6 @@
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#define deinterlace_line deinterlace_line_c
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#endif
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#define pixdesc_has_alpha(pixdesc) \
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((pixdesc)->nb_components == 2 || (pixdesc)->nb_components == 4 || (pixdesc)->flags & AV_PIX_FMT_FLAG_PAL)
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void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
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@ -66,189 +56,17 @@ void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int
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*v_shift = desc->log2_chroma_h;
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}
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static int get_color_type(const AVPixFmtDescriptor *desc) {
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if (desc->flags & AV_PIX_FMT_FLAG_PAL)
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return FF_COLOR_RGB;
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if(desc->nb_components == 1 || desc->nb_components == 2)
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return FF_COLOR_GRAY;
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if(desc->name && !strncmp(desc->name, "yuvj", 4))
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return FF_COLOR_YUV_JPEG;
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if(desc->flags & AV_PIX_FMT_FLAG_RGB)
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return FF_COLOR_RGB;
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if(desc->nb_components == 0)
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return FF_COLOR_NA;
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return FF_COLOR_YUV;
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}
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static int get_pix_fmt_depth(int *min, int *max, enum AVPixelFormat pix_fmt)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
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int i;
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if (!desc || !desc->nb_components) {
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*min = *max = 0;
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return AVERROR(EINVAL);
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}
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*min = INT_MAX, *max = -INT_MAX;
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for (i = 0; i < desc->nb_components; i++) {
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*min = FFMIN(desc->comp[i].depth_minus1+1, *min);
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*max = FFMAX(desc->comp[i].depth_minus1+1, *max);
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}
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return 0;
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}
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static int get_pix_fmt_score(enum AVPixelFormat dst_pix_fmt,
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enum AVPixelFormat src_pix_fmt,
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unsigned *lossp, unsigned consider)
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{
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const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);
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const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);
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int src_color, dst_color;
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int src_min_depth, src_max_depth, dst_min_depth, dst_max_depth;
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int ret, loss, i, nb_components;
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int score = INT_MAX - 1;
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if (dst_pix_fmt >= AV_PIX_FMT_NB || dst_pix_fmt <= AV_PIX_FMT_NONE)
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return ~0;
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/* compute loss */
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*lossp = loss = 0;
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if (dst_pix_fmt == src_pix_fmt)
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return INT_MAX;
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if ((ret = get_pix_fmt_depth(&src_min_depth, &src_max_depth, src_pix_fmt)) < 0)
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return ret;
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if ((ret = get_pix_fmt_depth(&dst_min_depth, &dst_max_depth, dst_pix_fmt)) < 0)
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return ret;
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src_color = get_color_type(src_desc);
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dst_color = get_color_type(dst_desc);
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if (dst_pix_fmt == AV_PIX_FMT_PAL8)
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nb_components = FFMIN(src_desc->nb_components, 4);
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else
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nb_components = FFMIN(src_desc->nb_components, dst_desc->nb_components);
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for (i = 0; i < nb_components; i++) {
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int depth_minus1 = (dst_pix_fmt == AV_PIX_FMT_PAL8) ? 7/nb_components : dst_desc->comp[i].depth_minus1;
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if (src_desc->comp[i].depth_minus1 > depth_minus1 && (consider & FF_LOSS_DEPTH)) {
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loss |= FF_LOSS_DEPTH;
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score -= 65536 >> depth_minus1;
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}
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}
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if (consider & FF_LOSS_RESOLUTION) {
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if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w) {
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loss |= FF_LOSS_RESOLUTION;
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score -= 256 << dst_desc->log2_chroma_w;
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}
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if (dst_desc->log2_chroma_h > src_desc->log2_chroma_h) {
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loss |= FF_LOSS_RESOLUTION;
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score -= 256 << dst_desc->log2_chroma_h;
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}
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// don't favor 422 over 420 if downsampling is needed, because 420 has much better support on the decoder side
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if (dst_desc->log2_chroma_w == 1 && src_desc->log2_chroma_w == 0 &&
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dst_desc->log2_chroma_h == 1 && src_desc->log2_chroma_h == 0 ) {
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score += 512;
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}
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}
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if(consider & FF_LOSS_COLORSPACE)
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switch(dst_color) {
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case FF_COLOR_RGB:
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if (src_color != FF_COLOR_RGB &&
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src_color != FF_COLOR_GRAY)
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loss |= FF_LOSS_COLORSPACE;
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break;
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case FF_COLOR_GRAY:
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if (src_color != FF_COLOR_GRAY)
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loss |= FF_LOSS_COLORSPACE;
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break;
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case FF_COLOR_YUV:
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if (src_color != FF_COLOR_YUV)
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loss |= FF_LOSS_COLORSPACE;
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break;
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case FF_COLOR_YUV_JPEG:
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if (src_color != FF_COLOR_YUV_JPEG &&
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src_color != FF_COLOR_YUV &&
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src_color != FF_COLOR_GRAY)
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loss |= FF_LOSS_COLORSPACE;
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break;
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default:
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/* fail safe test */
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if (src_color != dst_color)
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loss |= FF_LOSS_COLORSPACE;
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break;
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}
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if(loss & FF_LOSS_COLORSPACE)
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score -= (nb_components * 65536) >> FFMIN(dst_desc->comp[0].depth_minus1, src_desc->comp[0].depth_minus1);
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if (dst_color == FF_COLOR_GRAY &&
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src_color != FF_COLOR_GRAY && (consider & FF_LOSS_CHROMA)) {
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loss |= FF_LOSS_CHROMA;
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score -= 2 * 65536;
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}
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if (!pixdesc_has_alpha(dst_desc) && (pixdesc_has_alpha(src_desc) && (consider & FF_LOSS_ALPHA))) {
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loss |= FF_LOSS_ALPHA;
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score -= 65536;
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}
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if (dst_pix_fmt == AV_PIX_FMT_PAL8 && (consider & FF_LOSS_COLORQUANT) &&
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(src_pix_fmt != AV_PIX_FMT_PAL8 && (src_color != FF_COLOR_GRAY || (pixdesc_has_alpha(src_desc) && (consider & FF_LOSS_ALPHA))))) {
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loss |= FF_LOSS_COLORQUANT;
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score -= 65536;
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}
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*lossp = loss;
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return score;
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}
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int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
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enum AVPixelFormat src_pix_fmt,
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int has_alpha)
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{
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int loss;
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int ret = get_pix_fmt_score(dst_pix_fmt, src_pix_fmt, &loss, has_alpha ? ~0 : ~FF_LOSS_ALPHA);
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if (ret < 0)
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return ret;
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return loss;
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return av_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
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}
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enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
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enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
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{
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enum AVPixelFormat dst_pix_fmt;
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int loss1, loss2, loss_mask;
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const AVPixFmtDescriptor *desc1 = av_pix_fmt_desc_get(dst_pix_fmt1);
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const AVPixFmtDescriptor *desc2 = av_pix_fmt_desc_get(dst_pix_fmt2);
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int score1, score2;
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loss_mask= loss_ptr?~*loss_ptr:~0; /* use loss mask if provided */
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if(!has_alpha)
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loss_mask &= ~FF_LOSS_ALPHA;
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dst_pix_fmt = AV_PIX_FMT_NONE;
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score1 = get_pix_fmt_score(dst_pix_fmt1, src_pix_fmt, &loss1, loss_mask);
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score2 = get_pix_fmt_score(dst_pix_fmt2, src_pix_fmt, &loss2, loss_mask);
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if (score1 == score2) {
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if(av_get_padded_bits_per_pixel(desc2) != av_get_padded_bits_per_pixel(desc1)) {
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dst_pix_fmt = av_get_padded_bits_per_pixel(desc2) < av_get_padded_bits_per_pixel(desc1) ? dst_pix_fmt2 : dst_pix_fmt1;
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} else {
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dst_pix_fmt = desc2->nb_components < desc1->nb_components ? dst_pix_fmt2 : dst_pix_fmt1;
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}
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} else {
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dst_pix_fmt = score1 < score2 ? dst_pix_fmt2 : dst_pix_fmt1;
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}
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if (loss_ptr)
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*loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
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return dst_pix_fmt;
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return av_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, has_alpha, loss_ptr);
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}
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#if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
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@ -657,7 +475,7 @@ int main(void){
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av_log(NULL, AV_LOG_INFO, "%3d unused pixel format values\n", skip);
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skip = 0;
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}
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av_log(NULL, AV_LOG_INFO, "pix fmt %s yuv_plan:%d avg_bpp:%d colortype:%d\n", desc->name, is_yuv_planar(desc), av_get_padded_bits_per_pixel(desc), get_color_type(desc));
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av_log(NULL, AV_LOG_INFO, "pix fmt %s yuv_plan:%d avg_bpp:%d\n", desc->name, is_yuv_planar(desc), av_get_padded_bits_per_pixel(desc));
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if ((!(desc->flags & AV_PIX_FMT_FLAG_ALPHA)) != (desc->nb_components != 2 && desc->nb_components != 4)) {
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av_log(NULL, AV_LOG_ERROR, "Alpha flag mismatch\n");
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err = 1;
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@ -31,7 +31,6 @@
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#include "libavutil/internal.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "libavcodec/avcodec.h" // avcodec_find_best_pix_fmt_of_2()
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#include "avfilter.h"
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#include "formats.h"
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@ -628,7 +627,7 @@ static int pick_format(AVFilterLink *link, AVFilterLink *ref)
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int i;
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for (i=0; i<link->in_formats->nb_formats; i++) {
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enum AVPixelFormat p = link->in_formats->formats[i];
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best= avcodec_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
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best= av_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
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}
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av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
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av_get_pix_fmt_name(best), link->in_formats->nb_formats,
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@ -164,6 +164,7 @@ TESTPROGS = adler32 \
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opt \
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pca \
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parseutils \
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pixdesc \
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random_seed \
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rational \
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ripemd \
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@ -2082,3 +2082,226 @@ enum AVPixelFormat av_pix_fmt_swap_endianness(enum AVPixelFormat pix_fmt)
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return get_pix_fmt_internal(name);
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}
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#define FF_COLOR_NA -1
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#define FF_COLOR_RGB 0 /**< RGB color space */
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#define FF_COLOR_GRAY 1 /**< gray color space */
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#define FF_COLOR_YUV 2 /**< YUV color space. 16 <= Y <= 235, 16 <= U, V <= 240 */
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#define FF_COLOR_YUV_JPEG 3 /**< YUV color space. 0 <= Y <= 255, 0 <= U, V <= 255 */
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#define pixdesc_has_alpha(pixdesc) \
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((pixdesc)->nb_components == 2 || (pixdesc)->nb_components == 4 || (pixdesc)->flags & AV_PIX_FMT_FLAG_PAL)
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static int get_color_type(const AVPixFmtDescriptor *desc) {
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if (desc->flags & AV_PIX_FMT_FLAG_PAL)
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return FF_COLOR_RGB;
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if(desc->nb_components == 1 || desc->nb_components == 2)
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return FF_COLOR_GRAY;
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if(desc->name && !strncmp(desc->name, "yuvj", 4))
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return FF_COLOR_YUV_JPEG;
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if(desc->flags & AV_PIX_FMT_FLAG_RGB)
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return FF_COLOR_RGB;
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if(desc->nb_components == 0)
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return FF_COLOR_NA;
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return FF_COLOR_YUV;
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}
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static int get_pix_fmt_depth(int *min, int *max, enum AVPixelFormat pix_fmt)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
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int i;
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if (!desc || !desc->nb_components) {
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*min = *max = 0;
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return AVERROR(EINVAL);
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}
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*min = INT_MAX, *max = -INT_MAX;
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for (i = 0; i < desc->nb_components; i++) {
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*min = FFMIN(desc->comp[i].depth_minus1+1, *min);
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*max = FFMAX(desc->comp[i].depth_minus1+1, *max);
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}
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return 0;
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}
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|
||||
static int get_pix_fmt_score(enum AVPixelFormat dst_pix_fmt,
|
||||
enum AVPixelFormat src_pix_fmt,
|
||||
unsigned *lossp, unsigned consider)
|
||||
{
|
||||
const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);
|
||||
const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);
|
||||
int src_color, dst_color;
|
||||
int src_min_depth, src_max_depth, dst_min_depth, dst_max_depth;
|
||||
int ret, loss, i, nb_components;
|
||||
int score = INT_MAX - 1;
|
||||
|
||||
if (dst_pix_fmt >= AV_PIX_FMT_NB || dst_pix_fmt <= AV_PIX_FMT_NONE)
|
||||
return ~0;
|
||||
|
||||
/* compute loss */
|
||||
*lossp = loss = 0;
|
||||
|
||||
if (dst_pix_fmt == src_pix_fmt)
|
||||
return INT_MAX;
|
||||
|
||||
if ((ret = get_pix_fmt_depth(&src_min_depth, &src_max_depth, src_pix_fmt)) < 0)
|
||||
return ret;
|
||||
if ((ret = get_pix_fmt_depth(&dst_min_depth, &dst_max_depth, dst_pix_fmt)) < 0)
|
||||
return ret;
|
||||
|
||||
src_color = get_color_type(src_desc);
|
||||
dst_color = get_color_type(dst_desc);
|
||||
if (dst_pix_fmt == AV_PIX_FMT_PAL8)
|
||||
nb_components = FFMIN(src_desc->nb_components, 4);
|
||||
else
|
||||
nb_components = FFMIN(src_desc->nb_components, dst_desc->nb_components);
|
||||
|
||||
for (i = 0; i < nb_components; i++) {
|
||||
int depth_minus1 = (dst_pix_fmt == AV_PIX_FMT_PAL8) ? 7/nb_components : dst_desc->comp[i].depth_minus1;
|
||||
if (src_desc->comp[i].depth_minus1 > depth_minus1 && (consider & FF_LOSS_DEPTH)) {
|
||||
loss |= FF_LOSS_DEPTH;
|
||||
score -= 65536 >> depth_minus1;
|
||||
}
|
||||
}
|
||||
|
||||
if (consider & FF_LOSS_RESOLUTION) {
|
||||
if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w) {
|
||||
loss |= FF_LOSS_RESOLUTION;
|
||||
score -= 256 << dst_desc->log2_chroma_w;
|
||||
}
|
||||
if (dst_desc->log2_chroma_h > src_desc->log2_chroma_h) {
|
||||
loss |= FF_LOSS_RESOLUTION;
|
||||
score -= 256 << dst_desc->log2_chroma_h;
|
||||
}
|
||||
// don't favor 422 over 420 if downsampling is needed, because 420 has much better support on the decoder side
|
||||
if (dst_desc->log2_chroma_w == 1 && src_desc->log2_chroma_w == 0 &&
|
||||
dst_desc->log2_chroma_h == 1 && src_desc->log2_chroma_h == 0 ) {
|
||||
score += 512;
|
||||
}
|
||||
}
|
||||
|
||||
if(consider & FF_LOSS_COLORSPACE)
|
||||
switch(dst_color) {
|
||||
case FF_COLOR_RGB:
|
||||
if (src_color != FF_COLOR_RGB &&
|
||||
src_color != FF_COLOR_GRAY)
|
||||
loss |= FF_LOSS_COLORSPACE;
|
||||
break;
|
||||
case FF_COLOR_GRAY:
|
||||
if (src_color != FF_COLOR_GRAY)
|
||||
loss |= FF_LOSS_COLORSPACE;
|
||||
break;
|
||||
case FF_COLOR_YUV:
|
||||
if (src_color != FF_COLOR_YUV)
|
||||
loss |= FF_LOSS_COLORSPACE;
|
||||
break;
|
||||
case FF_COLOR_YUV_JPEG:
|
||||
if (src_color != FF_COLOR_YUV_JPEG &&
|
||||
src_color != FF_COLOR_YUV &&
|
||||
src_color != FF_COLOR_GRAY)
|
||||
loss |= FF_LOSS_COLORSPACE;
|
||||
break;
|
||||
default:
|
||||
/* fail safe test */
|
||||
if (src_color != dst_color)
|
||||
loss |= FF_LOSS_COLORSPACE;
|
||||
break;
|
||||
}
|
||||
if(loss & FF_LOSS_COLORSPACE)
|
||||
score -= (nb_components * 65536) >> FFMIN(dst_desc->comp[0].depth_minus1, src_desc->comp[0].depth_minus1);
|
||||
|
||||
if (dst_color == FF_COLOR_GRAY &&
|
||||
src_color != FF_COLOR_GRAY && (consider & FF_LOSS_CHROMA)) {
|
||||
loss |= FF_LOSS_CHROMA;
|
||||
score -= 2 * 65536;
|
||||
}
|
||||
if (!pixdesc_has_alpha(dst_desc) && (pixdesc_has_alpha(src_desc) && (consider & FF_LOSS_ALPHA))) {
|
||||
loss |= FF_LOSS_ALPHA;
|
||||
score -= 65536;
|
||||
}
|
||||
if (dst_pix_fmt == AV_PIX_FMT_PAL8 && (consider & FF_LOSS_COLORQUANT) &&
|
||||
(src_pix_fmt != AV_PIX_FMT_PAL8 && (src_color != FF_COLOR_GRAY || (pixdesc_has_alpha(src_desc) && (consider & FF_LOSS_ALPHA))))) {
|
||||
loss |= FF_LOSS_COLORQUANT;
|
||||
score -= 65536;
|
||||
}
|
||||
|
||||
*lossp = loss;
|
||||
return score;
|
||||
}
|
||||
|
||||
int av_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
|
||||
enum AVPixelFormat src_pix_fmt,
|
||||
int has_alpha)
|
||||
{
|
||||
int loss;
|
||||
int ret = get_pix_fmt_score(dst_pix_fmt, src_pix_fmt, &loss, has_alpha ? ~0 : ~FF_LOSS_ALPHA);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
return loss;
|
||||
}
|
||||
|
||||
enum AVPixelFormat av_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
|
||||
enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
|
||||
{
|
||||
enum AVPixelFormat dst_pix_fmt;
|
||||
int loss1, loss2, loss_mask;
|
||||
const AVPixFmtDescriptor *desc1 = av_pix_fmt_desc_get(dst_pix_fmt1);
|
||||
const AVPixFmtDescriptor *desc2 = av_pix_fmt_desc_get(dst_pix_fmt2);
|
||||
int score1, score2;
|
||||
|
||||
loss_mask= loss_ptr?~*loss_ptr:~0; /* use loss mask if provided */
|
||||
if(!has_alpha)
|
||||
loss_mask &= ~FF_LOSS_ALPHA;
|
||||
|
||||
dst_pix_fmt = AV_PIX_FMT_NONE;
|
||||
score1 = get_pix_fmt_score(dst_pix_fmt1, src_pix_fmt, &loss1, loss_mask);
|
||||
score2 = get_pix_fmt_score(dst_pix_fmt2, src_pix_fmt, &loss2, loss_mask);
|
||||
|
||||
if (score1 == score2) {
|
||||
if(av_get_padded_bits_per_pixel(desc2) != av_get_padded_bits_per_pixel(desc1)) {
|
||||
dst_pix_fmt = av_get_padded_bits_per_pixel(desc2) < av_get_padded_bits_per_pixel(desc1) ? dst_pix_fmt2 : dst_pix_fmt1;
|
||||
} else {
|
||||
dst_pix_fmt = desc2->nb_components < desc1->nb_components ? dst_pix_fmt2 : dst_pix_fmt1;
|
||||
}
|
||||
} else {
|
||||
dst_pix_fmt = score1 < score2 ? dst_pix_fmt2 : dst_pix_fmt1;
|
||||
}
|
||||
|
||||
if (loss_ptr)
|
||||
*loss_ptr = av_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
|
||||
return dst_pix_fmt;
|
||||
}
|
||||
|
||||
#ifdef TEST
|
||||
|
||||
int main(void){
|
||||
int i;
|
||||
int err=0;
|
||||
int skip = 0;
|
||||
|
||||
for (i=0; i<AV_PIX_FMT_NB*2; i++) {
|
||||
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
|
||||
if(!desc || !desc->name) {
|
||||
skip ++;
|
||||
continue;
|
||||
}
|
||||
if (skip) {
|
||||
av_log(NULL, AV_LOG_INFO, "%3d unused pixel format values\n", skip);
|
||||
skip = 0;
|
||||
}
|
||||
av_log(NULL, AV_LOG_INFO, "pix fmt %s avg_bpp:%d colortype:%d\n", desc->name, av_get_padded_bits_per_pixel(desc), get_color_type(desc));
|
||||
if ((!(desc->flags & AV_PIX_FMT_FLAG_ALPHA)) != (desc->nb_components != 2 && desc->nb_components != 4)) {
|
||||
av_log(NULL, AV_LOG_ERROR, "Alpha flag mismatch\n");
|
||||
err = 1;
|
||||
}
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -255,7 +255,7 @@ enum AVPixelFormat av_pix_fmt_desc_get_id(const AVPixFmtDescriptor *desc);
|
|||
* Utility function to access log2_chroma_w log2_chroma_h from
|
||||
* the pixel format AVPixFmtDescriptor.
|
||||
*
|
||||
* See avcodec_get_chroma_sub_sample() for a function that asserts a
|
||||
* See av_get_chroma_sub_sample() for a function that asserts a
|
||||
* valid pixel format instead of returning an error code.
|
||||
* Its recommanded that you use avcodec_get_chroma_sub_sample unless
|
||||
* you do check the return code!
|
||||
|
|
@ -287,5 +287,53 @@ void ff_check_pixfmt_descriptors(void);
|
|||
*/
|
||||
enum AVPixelFormat av_pix_fmt_swap_endianness(enum AVPixelFormat pix_fmt);
|
||||
|
||||
#define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
|
||||
#define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
|
||||
#define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
|
||||
#define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
|
||||
#define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
|
||||
#define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
|
||||
|
||||
/**
|
||||
* Compute what kind of losses will occur when converting from one specific
|
||||
* pixel format to another.
|
||||
* When converting from one pixel format to another, information loss may occur.
|
||||
* For example, when converting from RGB24 to GRAY, the color information will
|
||||
* be lost. Similarly, other losses occur when converting from some formats to
|
||||
* other formats. These losses can involve loss of chroma, but also loss of
|
||||
* resolution, loss of color depth, loss due to the color space conversion, loss
|
||||
* of the alpha bits or loss due to color quantization.
|
||||
* av_get_fix_fmt_loss() informs you about the various types of losses
|
||||
* which will occur when converting from one pixel format to another.
|
||||
*
|
||||
* @param[in] dst_pix_fmt destination pixel format
|
||||
* @param[in] src_pix_fmt source pixel format
|
||||
* @param[in] has_alpha Whether the source pixel format alpha channel is used.
|
||||
* @return Combination of flags informing you what kind of losses will occur
|
||||
* (maximum loss for an invalid dst_pix_fmt).
|
||||
*/
|
||||
int av_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
|
||||
enum AVPixelFormat src_pix_fmt,
|
||||
int has_alpha);
|
||||
|
||||
/**
|
||||
* Compute what kind of losses will occur when converting from one specific
|
||||
* pixel format to another.
|
||||
* When converting from one pixel format to another, information loss may occur.
|
||||
* For example, when converting from RGB24 to GRAY, the color information will
|
||||
* be lost. Similarly, other losses occur when converting from some formats to
|
||||
* other formats. These losses can involve loss of chroma, but also loss of
|
||||
* resolution, loss of color depth, loss due to the color space conversion, loss
|
||||
* of the alpha bits or loss due to color quantization.
|
||||
* av_get_fix_fmt_loss() informs you about the various types of losses
|
||||
* which will occur when converting from one pixel format to another.
|
||||
*
|
||||
* @param[in] dst_pix_fmt destination pixel format
|
||||
* @param[in] src_pix_fmt source pixel format
|
||||
* @param[in] has_alpha Whether the source pixel format alpha channel is used.
|
||||
* @return Combination of flags informing you what kind of losses will occur
|
||||
* (maximum loss for an invalid dst_pix_fmt).
|
||||
*/
|
||||
enum AVPixelFormat av_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
|
||||
enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
|
||||
#endif /* AVUTIL_PIXDESC_H */
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user