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swscale: add support for endianness only conversion 

Use bitfields in FormatEntry array to avoid wasting an int for each flag.
This commit is contained in:
Janne Grunau 2013-04-26 14:47:08 +02:00
parent 74652af821
commit c1eb3e7fec
3 changed files with 20 additions and 2 deletions
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7
libswscale/swscale.h
View File

@ -140,6 +140,13 @@ int sws_isSupportedInput(enum AVPixelFormat pix_fmt);
*/
int sws_isSupportedOutput(enum AVPixelFormat pix_fmt);
/**
* @param[in] pix_fmt the pixel format
* @return a positive value if an endianness conversion for pix_fmt is
* supported, 0 otherwise.
*/
int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt);
/**
* Allocate an empty SwsContext. This must be filled and passed to
* sws_init_context(). For filling see AVOptions, options.c and

13
libswscale/utils.c
View File

@ -70,7 +70,9 @@ const char *swscale_license(void)
#define RET 0xC3 // near return opcode for x86
typedef struct FormatEntry {
int is_supported_in, is_supported_out;
uint8_t is_supported_in :1;
uint8_t is_supported_out :1;
uint8_t is_supported_endianness :1;
} FormatEntry;
static const FormatEntry format_entries[AV_PIX_FMT_NB] = {
@ -184,6 +186,12 @@ int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)
format_entries[pix_fmt].is_supported_out : 0;
}
int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)
{
return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
format_entries[pix_fmt].is_supported_endianness : 0;
}
extern const int32_t ff_yuv2rgb_coeffs[8][4];
const char *sws_format_name(enum AVPixelFormat format)
@ -880,6 +888,8 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
unscaled = (srcW == dstW && srcH == dstH);
if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&
av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {
if (!sws_isSupportedInput(srcFormat)) {
av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",
sws_format_name(srcFormat));
@ -890,6 +900,7 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
sws_format_name(dstFormat));
return AVERROR(EINVAL);
}
}
i = flags & (SWS_POINT |
SWS_AREA |

2
libswscale/version.h
View File

@ -28,7 +28,7 @@
#define LIBSWSCALE_VERSION_MAJOR 2
#define LIBSWSCALE_VERSION_MINOR 1
#define LIBSWSCALE_VERSION_MICRO 1
#define LIBSWSCALE_VERSION_MICRO 2
#define LIBSWSCALE_VERSION_INT AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \
LIBSWSCALE_VERSION_MINOR, \