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Code Issues Releases Activity

avutil/pixdesc: Add av_write_image_line2(), av_read_image_line2()

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This is needed because of 32bit float formats (which are difficult to
store in 16bits)

This also fixes undefined behavior found by fate

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-10-25 23:08:20 +02:00
parent a5d98da4d6
commit 718044dc19
6 changed files with 73 additions and 19 deletions
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3
doc/APIchanges
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@ -15,6 +15,9 @@ libavutil: 2017-10-21
API changes, most recent first:
2018-XX-XX - xxxxxxxxxx - lavu 56.21.100 - pixdesc.h
Add av_read_image_line2(), av_write_image_line2()
2018-10-24 - xxxxxxxxxx - lavu 56.20.100 - frame.h
Add AV_FRAME_DATA_S12M_TIMECODE

72
libavutil/pixdesc.c
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@ -31,19 +31,22 @@
#include "intreadwrite.h"
#include "version.h"
void av_read_image_line(uint16_t *dst,
void av_read_image_line2(void *dst,
const uint8_t *data[4], const int linesize[4],
const AVPixFmtDescriptor *desc,
int x, int y, int c, int w,
int read_pal_component)
int read_pal_component,
int dst_element_size)
{
AVComponentDescriptor comp = desc->comp[c];
int plane = comp.plane;
int depth = comp.depth;
int mask = (1 << depth) - 1;
unsigned mask = (1ULL << depth) - 1;
int shift = comp.shift;
int step = comp.step;
int flags = desc->flags;
uint16_t *dst16 = dst;
uint32_t *dst32 = dst;
if (flags & AV_PIX_FMT_FLAG_BITSTREAM) {
int skip = x * step + comp.offset;
@ -57,38 +60,56 @@ void av_read_image_line(uint16_t *dst,
shift -= step;
p -= shift >> 3;
shift &= 7;
*dst++ = val;
if (dst_element_size == 4) *dst32++ = val;
else *dst16++ = val;
}
} else {
const uint8_t *p = data[plane] + y * linesize[plane] +
x * step + comp.offset;
int is_8bit = shift + depth <= 8;
int is_16bit= shift + depth <=16;
if (is_8bit)
p += !!(flags & AV_PIX_FMT_FLAG_BE);
while (w--) {
int val = is_8bit ? *p :
flags & AV_PIX_FMT_FLAG_BE ? AV_RB16(p) : AV_RL16(p);
unsigned val;
if (is_8bit) val = *p;
else if(is_16bit) val = flags & AV_PIX_FMT_FLAG_BE ? AV_RB16(p) : AV_RL16(p);
else val = flags & AV_PIX_FMT_FLAG_BE ? AV_RB32(p) : AV_RL32(p);
val = (val >> shift) & mask;
if (read_pal_component)
val = data[1][4 * val + c];
p += step;
*dst++ = val;
if (dst_element_size == 4) *dst32++ = val;
else *dst16++ = val;
}
}
}
void av_write_image_line(const uint16_t *src,
void av_read_image_line(uint16_t *dst,
const uint8_t *data[4], const int linesize[4],
const AVPixFmtDescriptor *desc,
int x, int y, int c, int w,
int read_pal_component)
{
av_read_image_line2(dst, data, linesize, desc,x, y, c, w,
read_pal_component,
2);
}
void av_write_image_line2(const void *src,
uint8_t *data[4], const int linesize[4],
const AVPixFmtDescriptor *desc,
int x, int y, int c, int w)
int x, int y, int c, int w, int src_element_size)
{
AVComponentDescriptor comp = desc->comp[c];
int plane = comp.plane;
int depth = comp.depth;
int step = comp.step;
int flags = desc->flags;
const uint32_t *src32 = src;
const uint16_t *src16 = src;
if (flags & AV_PIX_FMT_FLAG_BITSTREAM) {
int skip = x * step + comp.offset;
@ -96,7 +117,7 @@ void av_write_image_line(const uint16_t *src,
int shift = 8 - depth - (skip & 7);
while (w--) {
*p |= *src++ << shift;
*p |= (src_element_size == 4 ? *src32++ : *src16++) << shift;
shift -= step;
p -= shift >> 3;
shift &= 7;
@ -109,17 +130,28 @@ void av_write_image_line(const uint16_t *src,
if (shift + depth <= 8) {
p += !!(flags & AV_PIX_FMT_FLAG_BE);
while (w--) {
*p |= (*src++ << shift);
*p |= ((src_element_size == 4 ? *src32++ : *src16++) << shift);
p += step;
}
} else {
while (w--) {
if (flags & AV_PIX_FMT_FLAG_BE) {
uint16_t val = AV_RB16(p) | (*src++ << shift);
AV_WB16(p, val);
unsigned s = (src_element_size == 4 ? *src32++ : *src16++);
if (shift + depth <= 16) {
if (flags & AV_PIX_FMT_FLAG_BE) {
uint16_t val = AV_RB16(p) | (s << shift);
AV_WB16(p, val);
} else {
uint16_t val = AV_RL16(p) | (s << shift);
AV_WL16(p, val);
}
} else {
uint16_t val = AV_RL16(p) | (*src++ << shift);
AV_WL16(p, val);
if (flags & AV_PIX_FMT_FLAG_BE) {
uint32_t val = AV_RB32(p) | (s << shift);
AV_WB32(p, val);
} else {
uint32_t val = AV_RL32(p) | (s << shift);
AV_WL32(p, val);
}
}
p += step;
}
@ -127,6 +159,14 @@ void av_write_image_line(const uint16_t *src,
}
}
void av_write_image_line(const uint16_t *src,
uint8_t *data[4], const int linesize[4],
const AVPixFmtDescriptor *desc,
int x, int y, int c, int w)
{
av_write_image_line2(src, data, linesize, desc, x, y, c, w, 2);
}
#if FF_API_PLUS1_MINUS1
FF_DISABLE_DEPRECATION_WARNINGS
#endif

11
libavutil/pixdesc.h
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@ -343,7 +343,13 @@ char *av_get_pix_fmt_string(char *buf, int buf_size,
* format writes the values corresponding to the palette
* component c in data[1] to dst, rather than the palette indexes in
* data[0]. The behavior is undefined if the format is not paletted.
* @param dst_element_size size of elements in dst array (2 or 4 byte)
*/
void av_read_image_line2(void *dst, const uint8_t *data[4],
const int linesize[4], const AVPixFmtDescriptor *desc,
int x, int y, int c, int w, int read_pal_component,
int dst_element_size);
void av_read_image_line(uint16_t *dst, const uint8_t *data[4],
const int linesize[4], const AVPixFmtDescriptor *desc,
int x, int y, int c, int w, int read_pal_component);
@ -361,7 +367,12 @@ void av_read_image_line(uint16_t *dst, const uint8_t *data[4],
* @param y the vertical coordinate of the first pixel to write
* @param w the width of the line to write, that is the number of
* values to write to the image line
* @param src_element_size size of elements in src array (2 or 4 byte)
*/
void av_write_image_line2(const void *src, uint8_t *data[4],
const int linesize[4], const AVPixFmtDescriptor *desc,
int x, int y, int c, int w, int src_element_size);
void av_write_image_line(const uint16_t *src, uint8_t *data[4],
const int linesize[4], const AVPixFmtDescriptor *desc,
int x, int y, int c, int w);

2
libavutil/version.h
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@ -79,7 +79,7 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 56
#define LIBAVUTIL_VERSION_MINOR 20
#define LIBAVUTIL_VERSION_MINOR 21
#define LIBAVUTIL_VERSION_MICRO 100
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \

2
tests/ref/fate/filter-pixdesc-grayf32be
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@ -1 +1 @@
pixdesc-grayf32be 381c8d0f19d286809b91cd6e6c0048ab
pixdesc-grayf32be 047d17c62f2e712c6547e4227b427303

2
tests/ref/fate/filter-pixdesc-grayf32le
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@ -1 +1 @@
pixdesc-grayf32le 381c8d0f19d286809b91cd6e6c0048ab
pixdesc-grayf32le cdedfdbaa4e192b9f2c84092f955fb4b