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imgconvert: store padded size information in PixFmtInfo, simplify avg_bits_per_pixel()

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Prefer data-driven over procedural logic in avg_bits_per_pixel(),
simplify and improve robustness, as it is easy to miss a function
update when a new format is added.
This commit is contained in:
Stefano Sabatini 2011-07-19 15:38:53 +02:00
parent 49f612ee29
commit 3b8bb503ee
1 changed files with 16 additions and 46 deletions
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62
libavcodec/imgconvert.c
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@ -64,6 +64,7 @@ typedef struct PixFmtInfo {
uint8_t pixel_type; /**< pixel storage type (see FF_PIXEL_xxx constants) */
uint8_t is_alpha : 1; /**< true if alpha can be specified */
uint8_t depth; /**< bit depth of the color components */
uint8_t padded_size; /**< padded size in bits if different from the non-padded size */
} PixFmtInfo;
/* this table gives more information about formats */
@ -210,21 +211,25 @@ static const PixFmtInfo pix_fmt_info[PIX_FMT_NB] = {
.color_type = FF_COLOR_RGB,
.pixel_type = FF_PIXEL_PACKED,
.depth = 5,
.padded_size = 16,
},
[PIX_FMT_RGB555LE] = {
.color_type = FF_COLOR_RGB,
.pixel_type = FF_PIXEL_PACKED,
.depth = 5,
.padded_size = 16,
},
[PIX_FMT_RGB444BE] = {
.color_type = FF_COLOR_RGB,
.pixel_type = FF_PIXEL_PACKED,
.depth = 4,
.padded_size = 16,
},
[PIX_FMT_RGB444LE] = {
.color_type = FF_COLOR_RGB,
.pixel_type = FF_PIXEL_PACKED,
.depth = 4,
.padded_size = 16,
},
/* gray / mono formats */
@ -276,31 +281,37 @@ static const PixFmtInfo pix_fmt_info[PIX_FMT_NB] = {
.color_type = FF_COLOR_RGB,
.pixel_type = FF_PIXEL_PACKED,
.depth = 5,
.padded_size = 16,
},
[PIX_FMT_BGR565LE] = {
.color_type = FF_COLOR_RGB,
.pixel_type = FF_PIXEL_PACKED,
.depth = 5,
.padded_size = 16,
},
[PIX_FMT_BGR555BE] = {
.color_type = FF_COLOR_RGB,
.pixel_type = FF_PIXEL_PACKED,
.depth = 5,
.padded_size = 16,
},
[PIX_FMT_BGR555LE] = {
.color_type = FF_COLOR_RGB,
.pixel_type = FF_PIXEL_PACKED,
.depth = 5,
.padded_size = 16,
},
[PIX_FMT_BGR444BE] = {
.color_type = FF_COLOR_RGB,
.pixel_type = FF_PIXEL_PACKED,
.depth = 4,
.padded_size = 16,
},
[PIX_FMT_BGR444LE] = {
.color_type = FF_COLOR_RGB,
.pixel_type = FF_PIXEL_PACKED,
.depth = 4,
.padded_size = 16,
},
[PIX_FMT_RGB8] = {
.color_type = FF_COLOR_RGB,
@ -316,6 +327,7 @@ static const PixFmtInfo pix_fmt_info[PIX_FMT_NB] = {
.color_type = FF_COLOR_RGB,
.pixel_type = FF_PIXEL_PACKED,
.depth = 8,
.padded_size = 8,
},
[PIX_FMT_BGR8] = {
.color_type = FF_COLOR_RGB,
@ -331,6 +343,7 @@ static const PixFmtInfo pix_fmt_info[PIX_FMT_NB] = {
.color_type = FF_COLOR_RGB,
.pixel_type = FF_PIXEL_PACKED,
.depth = 8,
.padded_size = 8,
},
[PIX_FMT_NV12] = {
.color_type = FF_COLOR_YUV,
@ -500,54 +513,11 @@ int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_
static int avg_bits_per_pixel(enum PixelFormat pix_fmt)
{
int bits;
const PixFmtInfo *pf;
const PixFmtInfo *info = &pix_fmt_info[pix_fmt];
const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
pf = &pix_fmt_info[pix_fmt];
switch(pf->pixel_type) {
case FF_PIXEL_PACKED:
switch(pix_fmt) {
case PIX_FMT_YUYV422:
case PIX_FMT_UYVY422:
case PIX_FMT_RGB565BE:
case PIX_FMT_RGB565LE:
case PIX_FMT_RGB555BE:
case PIX_FMT_RGB555LE:
case PIX_FMT_RGB444BE:
case PIX_FMT_RGB444LE:
case PIX_FMT_BGR565BE:
case PIX_FMT_BGR565LE:
case PIX_FMT_BGR555BE:
case PIX_FMT_BGR555LE:
case PIX_FMT_BGR444BE:
case PIX_FMT_BGR444LE:
bits = 16;
break;
case PIX_FMT_UYYVYY411:
bits = 12;
break;
default:
bits = av_get_bits_per_pixel(desc);
break;
}
break;
case FF_PIXEL_PLANAR:
if (desc->log2_chroma_w == 0 && desc->log2_chroma_h == 0) {
bits = av_get_bits_per_pixel(desc);
} else {
bits = pf->depth + ((2 * pf->depth) >>
(desc->log2_chroma_w + desc->log2_chroma_h));
}
break;
case FF_PIXEL_PALETTE:
bits = 8;
break;
default:
bits = -1;
break;
}
return bits;
return info->padded_size ?
info->padded_size : av_get_bits_per_pixel(desc);
}
static enum PixelFormat avcodec_find_best_pix_fmt1(int64_t pix_fmt_mask,