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png: K&R formatting cosmetics

tags/n2.3
Vittorio Giovara 11 years ago
parent
f7518f1a0e
commit
c598b569fb
4 changed files with 209 additions and 185 deletions
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  1. +3
    -3
      libavcodec/png.c
  2. +117
    -104
      libavcodec/pngdec.c
  3. +5
    -4
      libavcodec/pngdsp.c
  4. +84
    -74
      libavcodec/pngenc.c

+ 3
- 3
libavcodec/png.c View File

@@ -22,8 +22,8 @@
#include "bytestream.h"
#include "png.h"

const uint8_t ff_pngsig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
const uint8_t ff_mngsig[8] = {138, 77, 78, 71, 13, 10, 26, 10};
const uint8_t ff_pngsig[8] = { 137, 80, 78, 71, 13, 10, 26, 10 };
const uint8_t ff_mngsig[8] = { 138, 77, 78, 71, 13, 10, 26, 10 };

/* Mask to determine which y pixels are valid in a pass */
const uint8_t ff_png_pass_ymask[NB_PASSES] = {
@@ -75,7 +75,7 @@ int ff_png_pass_row_size(int pass, int bits_per_pixel, int width)
xmin = ff_png_pass_xmin[pass];
if (width <= xmin)
return 0;
shift = ff_png_pass_xshift[pass];
shift = ff_png_pass_xshift[pass];
pass_width = (width - xmin + (1 << shift) - 1) >> shift;
return (pass_width * bits_per_pixel + 7) >> 3;
}

+ 117
- 104
libavcodec/pngdec.c View File

@@ -73,8 +73,8 @@ static const uint8_t png_pass_dsp_mask[NB_PASSES] = {
};

/* NOTE: we try to construct a good looking image at each pass. width
is the original image width. We also do pixel format conversion at
this stage */
* is the original image width. We also do pixel format conversion at
* this stage */
static void png_put_interlaced_row(uint8_t *dst, int width,
int bits_per_pixel, int pass,
int color_type, const uint8_t *src)
@@ -117,7 +117,7 @@ static void png_put_interlaced_row(uint8_t *dst, int width,
s += bpp;
}
} else {
for(x = 0; x < width; x++) {
for (x = 0; x < width; x++) {
j = x & 7;
if ((dsp_mask << j) & 0x80) {
memcpy(d, s, bpp);
@@ -131,7 +131,8 @@ static void png_put_interlaced_row(uint8_t *dst, int width,
}
}

void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top,
int w, int bpp)
{
int i;
for (i = 0; i < w; i++) {
@@ -158,34 +159,45 @@ void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w
}
}

#define UNROLL1(bpp, op) {\
r = dst[0];\
if(bpp >= 2) g = dst[1];\
if(bpp >= 3) b = dst[2];\
if(bpp >= 4) a = dst[3];\
for(; i < size; i+=bpp) {\
dst[i+0] = r = op(r, src[i+0], last[i+0]);\
if(bpp == 1) continue;\
dst[i+1] = g = op(g, src[i+1], last[i+1]);\
if(bpp == 2) continue;\
dst[i+2] = b = op(b, src[i+2], last[i+2]);\
if(bpp == 3) continue;\
dst[i+3] = a = op(a, src[i+3], last[i+3]);\
}\
#define UNROLL1(bpp, op) { \
r = dst[0]; \
if (bpp >= 2) \
g = dst[1]; \
if (bpp >= 3) \
b = dst[2]; \
if (bpp >= 4) \
a = dst[3]; \
for (; i < size; i += bpp) { \
dst[i + 0] = r = op(r, src[i + 0], last[i + 0]); \
if (bpp == 1) \
continue; \
dst[i + 1] = g = op(g, src[i + 1], last[i + 1]); \
if (bpp == 2) \
continue; \
dst[i + 2] = b = op(b, src[i + 2], last[i + 2]); \
if (bpp == 3) \
continue; \
dst[i + 3] = a = op(a, src[i + 3], last[i + 3]); \
} \
}

#define UNROLL_FILTER(op)\
if(bpp == 1) UNROLL1(1, op)\
else if(bpp == 2) UNROLL1(2, op)\
else if(bpp == 3) UNROLL1(3, op)\
else if(bpp == 4) UNROLL1(4, op)\
else {\
for (; i < size; i += bpp) {\
int j;\
for (j = 0; j < bpp; j++)\
dst[i+j] = op(dst[i+j-bpp], src[i+j], last[i+j]);\
}\
}
#define UNROLL_FILTER(op) \
if (bpp == 1) \
UNROLL1(1, op) \
else if (bpp == 2) \
UNROLL1(2, op) \
else if (bpp == 3) \
UNROLL1(3, op) \
else if (bpp == 4) \
UNROLL1(4, op) \
else { \
for (; i < size; i += bpp) { \
int j; \
for (j = 0; j < bpp; j++) \
dst[i + j] = op(dst[i + j - bpp], \
src[i + j], last[i + j]); \
} \
}

/* NOTE: 'dst' can be equal to 'last' */
static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
@@ -198,18 +210,17 @@ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
memcpy(dst, src, size);
break;
case PNG_FILTER_VALUE_SUB:
for (i = 0; i < bpp; i++) {
for (i = 0; i < bpp; i++)
dst[i] = src[i];
}
if (bpp == 4) {
p = *(int*)dst;
p = *(int *)dst;
for (; i < size; i += bpp) {
int s = *(int*)(src + i);
int s = *(int *)(src + i);
p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
*(int*)(dst + i) = p;
*(int *)(dst + i) = p;
}
} else {
#define OP_SUB(x,s,l) x+s
#define OP_SUB(x, s, l) x + s
UNROLL_FILTER(OP_SUB);
}
break;
@@ -218,19 +229,20 @@ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
break;
case PNG_FILTER_VALUE_AVG:
for (i = 0; i < bpp; i++) {
p = (last[i] >> 1);
p = (last[i] >> 1);
dst[i] = p + src[i];
}
#define OP_AVG(x,s,l) (((x + l) >> 1) + s) & 0xff
#define OP_AVG(x, s, l) (((x + l) >> 1) + s) & 0xff
UNROLL_FILTER(OP_AVG);
break;
case PNG_FILTER_VALUE_PAETH:
for (i = 0; i < bpp; i++) {
p = last[i];
p = last[i];
dst[i] = p + src[i];
}
if (bpp > 1 && size > 4) {
// would write off the end of the array if we let it process the last pixel with bpp=3
/* would write off the end of the array if we let it process
* the last pixel with bpp=3 */
int w = bpp == 4 ? size : size - 3;
dsp->add_paeth_prediction(dst + i, src + i, last + i, w - i, bpp);
i = w;
@@ -256,13 +268,14 @@ static av_always_inline void convert_to_rgb32_loco(uint8_t *dst,
r = (r + g) & 0xff;
b = (b + g) & 0xff;
}
*(uint32_t *)dst = (a << 24) | (r << 16) | (g << 8) | b;
*(uint32_t *) dst = (a << 24) | (r << 16) | (g << 8) | b;
dst += 4;
src += 4;
}
}

static void convert_to_rgb32(uint8_t *dst, const uint8_t *src, int width, int loco)
static void convert_to_rgb32(uint8_t *dst, const uint8_t *src,
int width, int loco)
{
if (loco)
convert_to_rgb32_loco(dst, src, width, 1);
@@ -292,8 +305,9 @@ static void png_handle_row(PNGDecContext *s)
if (s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
s->last_row, s->row_size, s->bpp);
convert_to_rgb32(ptr, s->tmp_row, s->width, s->filter_type == PNG_FILTER_TYPE_LOCO);
FFSWAP(uint8_t*, s->last_row, s->tmp_row);
convert_to_rgb32(ptr, s->tmp_row, s->width,
s->filter_type == PNG_FILTER_TYPE_LOCO);
FFSWAP(uint8_t *, s->last_row, s->tmp_row);
} else {
/* in normal case, we avoid one copy */
if (s->y == 0)
@@ -321,12 +335,12 @@ static void png_handle_row(PNGDecContext *s)
ptr = s->image_buf + s->image_linesize * s->y;
if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) {
/* if we already read one row, it is time to stop to
wait for the next one */
* wait for the next one */
if (got_line)
break;
png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
s->last_row, s->pass_row_size, s->bpp);
FFSWAP(uint8_t*, s->last_row, s->tmp_row);
FFSWAP(uint8_t *, s->last_row, s->tmp_row);
got_line = 1;
}
if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
@@ -344,8 +358,8 @@ static void png_handle_row(PNGDecContext *s)
s->pass++;
s->y = 0;
s->pass_row_size = ff_png_pass_row_size(s->pass,
s->bits_per_pixel,
s->width);
s->bits_per_pixel,
s->width);
s->crow_size = s->pass_row_size + 1;
if (s->pass_row_size != 0)
break;
@@ -354,7 +368,7 @@ static void png_handle_row(PNGDecContext *s)
}
}
}
the_end: ;
the_end:;
}
}

@@ -379,7 +393,8 @@ static int png_decode_idat(PNGDecContext *s, int length)
s->zstream.next_out = s->crow_buf;
}
if (ret == Z_STREAM_END && s->zstream.avail_in > 0) {
av_log(NULL, AV_LOG_WARNING, "%d undecompressed bytes left in buffer\n", s->zstream.avail_in);
av_log(NULL, AV_LOG_WARNING,
"%d undecompressed bytes left in buffer\n", s->zstream.avail_in);
return 0;
}
}
@@ -390,11 +405,11 @@ static int decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
PNGDecContext * const s = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AVFrame *p = data;
uint8_t *crow_buf_base = NULL;
PNGDecContext *const s = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AVFrame *p = data;
uint8_t *crow_buf_base = NULL;
uint32_t tag, length;
int ret;

@@ -444,7 +459,7 @@ static int decode_frame(AVCodecContext *avctx,
bytestream2_skip(&s->gb, 4); /* crc */
s->state |= PNG_IHDR;
av_dlog(avctx, "width=%d height=%d depth=%d color_type=%d "
"compression_type=%d filter_type=%d interlace_type=%d\n",
"compression_type=%d filter_type=%d interlace_type=%d\n",
s->width, s->height, s->bit_depth, s->color_type,
s->compression_type, s->filter_type, s->interlace_type);
break;
@@ -501,10 +516,10 @@ static int decode_frame(AVCodecContext *avctx,
if (!s->interlace_type) {
s->crow_size = s->row_size + 1;
} else {
s->pass = 0;
s->pass = 0;
s->pass_row_size = ff_png_pass_row_size(s->pass,
s->bits_per_pixel,
s->width);
s->bits_per_pixel,
s->width);
s->crow_size = s->pass_row_size + 1;
}
av_dlog(avctx, "row_size=%d crow_size =%d\n",
@@ -540,42 +555,41 @@ static int decode_frame(AVCodecContext *avctx,
bytestream2_skip(&s->gb, 4); /* crc */
break;
case MKTAG('P', 'L', 'T', 'E'):
{
int n, i, r, g, b;

if ((length % 3) != 0 || length > 256 * 3)
goto skip_tag;
/* read the palette */
n = length / 3;
for (i = 0; i < n; i++) {
r = bytestream2_get_byte(&s->gb);
g = bytestream2_get_byte(&s->gb);
b = bytestream2_get_byte(&s->gb);
s->palette[i] = (0xff << 24) | (r << 16) | (g << 8) | b;
}
for (; i < 256; i++) {
s->palette[i] = (0xff << 24);
}
s->state |= PNG_PLTE;
bytestream2_skip(&s->gb, 4); /* crc */
{
int n, i, r, g, b;

if ((length % 3) != 0 || length > 256 * 3)
goto skip_tag;
/* read the palette */
n = length / 3;
for (i = 0; i < n; i++) {
r = bytestream2_get_byte(&s->gb);
g = bytestream2_get_byte(&s->gb);
b = bytestream2_get_byte(&s->gb);
s->palette[i] = (0xff << 24) | (r << 16) | (g << 8) | b;
}
break;
for (; i < 256; i++)
s->palette[i] = (0xff << 24);
s->state |= PNG_PLTE;
bytestream2_skip(&s->gb, 4); /* crc */
}
break;
case MKTAG('t', 'R', 'N', 'S'):
{
int v, i;

/* read the transparency. XXX: Only palette mode supported */
if (s->color_type != PNG_COLOR_TYPE_PALETTE ||
length > 256 ||
!(s->state & PNG_PLTE))
goto skip_tag;
for (i = 0; i < length; i++) {
v = bytestream2_get_byte(&s->gb);
s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
}
bytestream2_skip(&s->gb, 4); /* crc */
{
int v, i;

/* read the transparency. XXX: Only palette mode supported */
if (s->color_type != PNG_COLOR_TYPE_PALETTE ||
length > 256 ||
!(s->state & PNG_PLTE))
goto skip_tag;
for (i = 0; i < length; i++) {
v = bytestream2_get_byte(&s->gb);
s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
}
break;
bytestream2_skip(&s->gb, 4); /* crc */
}
break;
case MKTAG('I', 'E', 'N', 'D'):
if (!(s->state & PNG_ALLIMAGE))
goto fail;
@@ -583,44 +597,43 @@ static int decode_frame(AVCodecContext *avctx,
goto exit_loop;
default:
/* skip tag */
skip_tag:
skip_tag:
bytestream2_skip(&s->gb, length + 4);
break;
}
}
exit_loop:
/* handle p-frames only if a predecessor frame is available */
if (s->prev->data[0]) {
if (!(avpkt->flags & AV_PKT_FLAG_KEY)) {
exit_loop:
/* handle p-frames only if a predecessor frame is available */
if (s->prev->data[0]) {
if (!(avpkt->flags & AV_PKT_FLAG_KEY)) {
int i, j;
uint8_t *pd = p->data[0];
uint8_t *pd_last = s->prev->data[0];

for (j = 0; j < s->height; j++) {
for (i = 0; i < s->width * s->bpp; i++) {
for (i = 0; i < s->width * s->bpp; i++)
pd[i] += pd_last[i];
}
pd += s->image_linesize;
pd_last += s->image_linesize;
}
}
}

av_frame_unref(s->prev);
if ((ret = av_frame_ref(s->prev, p)) < 0)
goto fail;
av_frame_unref(s->prev);
if ((ret = av_frame_ref(s->prev, p)) < 0)
goto fail;

*got_frame = 1;

ret = bytestream2_tell(&s->gb);
the_end:
the_end:
inflateEnd(&s->zstream);
av_free(crow_buf_base);
s->crow_buf = NULL;
av_freep(&s->last_row);
av_freep(&s->tmp_row);
return ret;
fail:
fail:
ret = -1;
goto the_end;
}


+ 5
- 4
libavcodec/pngdsp.c View File

@@ -25,13 +25,13 @@
#include "pngdsp.h"

// 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
#define pb_7f (~0UL/255 * 0x7f)
#define pb_80 (~0UL/255 * 0x80)
#define pb_7f (~0UL / 255 * 0x7f)
#define pb_80 (~0UL / 255 * 0x80)

static void add_bytes_l2_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
{
long i;
for (i = 0; i <= w - (int)sizeof(long); i += sizeof(long)) {
for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
long a = *(long *)(src1 + i);
long b = *(long *)(src2 + i);
*(long *)(dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80);
@@ -45,5 +45,6 @@ av_cold void ff_pngdsp_init(PNGDSPContext *dsp)
dsp->add_bytes_l2 = add_bytes_l2_c;
dsp->add_paeth_prediction = ff_add_png_paeth_prediction;

if (ARCH_X86) ff_pngdsp_init_x86(dsp);
if (ARCH_X86)
ff_pngdsp_init_x86(dsp);
}

+ 84
- 74
libavcodec/pngenc.c View File

@@ -18,6 +18,7 @@
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#include "avcodec.h"
#include "bytestream.h"
#include "dsputil.h"
@@ -53,11 +54,11 @@ static void png_get_interlaced_row(uint8_t *dst, int row_size,
const uint8_t *s;

mask = ff_png_pass_mask[pass];
switch(bits_per_pixel) {
switch (bits_per_pixel) {
case 1:
memset(dst, 0, row_size);
dst_x = 0;
for(x = 0; x < width; x++) {
for (x = 0; x < width; x++) {
j = (x & 7);
if ((mask << j) & 0x80) {
b = (src[x >> 3] >> (7 - j)) & 1;
@@ -70,7 +71,7 @@ static void png_get_interlaced_row(uint8_t *dst, int row_size,
bpp = bits_per_pixel >> 3;
d = dst;
s = src;
for(x = 0; x < width; x++) {
for (x = 0; x < width; x++) {
j = x & 7;
if ((mask << j) & 0x80) {
memcpy(d, s, bpp);
@@ -82,17 +83,18 @@ static void png_get_interlaced_row(uint8_t *dst, int row_size,
}
}

static void sub_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp)
static void sub_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top,
int w, int bpp)
{
int i;
for(i = 0; i < w; i++) {
for (i = 0; i < w; i++) {
int a, b, c, p, pa, pb, pc;

a = src[i - bpp];
b = top[i];
c = top[i - bpp];

p = b - c;
p = b - c;
pc = a - c;

pa = abs(p);
@@ -114,27 +116,27 @@ static void png_filter_row(DSPContext *dsp, uint8_t *dst, int filter_type,
{
int i;

switch(filter_type) {
switch (filter_type) {
case PNG_FILTER_VALUE_NONE:
memcpy(dst, src, size);
break;
case PNG_FILTER_VALUE_SUB:
dsp->diff_bytes(dst, src, src-bpp, size);
dsp->diff_bytes(dst, src, src - bpp, size);
memcpy(dst, src, bpp);
break;
case PNG_FILTER_VALUE_UP:
dsp->diff_bytes(dst, src, top, size);
break;
case PNG_FILTER_VALUE_AVG:
for(i = 0; i < bpp; i++)
for (i = 0; i < bpp; i++)
dst[i] = src[i] - (top[i] >> 1);
for(; i < size; i++)
dst[i] = src[i] - ((src[i-bpp] + top[i]) >> 1);
for (; i < size; i++)
dst[i] = src[i] - ((src[i - bpp] + top[i]) >> 1);
break;
case PNG_FILTER_VALUE_PAETH:
for(i = 0; i < bpp; i++)
for (i = 0; i < bpp; i++)
dst[i] = src[i] - top[i];
sub_png_paeth_prediction(dst+i, src+i, top+i, size-i, bpp);
sub_png_paeth_prediction(dst + i, src + i, top + i, size - i, bpp);
break;
}
}
@@ -144,26 +146,26 @@ static uint8_t *png_choose_filter(PNGEncContext *s, uint8_t *dst,
{
int pred = s->filter_type;
assert(bpp || !pred);
if(!top && pred)
if (!top && pred)
pred = PNG_FILTER_VALUE_SUB;
if(pred == PNG_FILTER_VALUE_MIXED) {
if (pred == PNG_FILTER_VALUE_MIXED) {
int i;
int cost, bcost = INT_MAX;
uint8_t *buf1 = dst, *buf2 = dst + size + 16;
for(pred=0; pred<5; pred++) {
png_filter_row(&s->dsp, buf1+1, pred, src, top, size, bpp);
for (pred = 0; pred < 5; pred++) {
png_filter_row(&s->dsp, buf1 + 1, pred, src, top, size, bpp);
buf1[0] = pred;
cost = 0;
for(i=0; i<=size; i++)
cost += abs((int8_t)buf1[i]);
if(cost < bcost) {
for (i = 0; i <= size; i++)
cost += abs((int8_t) buf1[i]);
if (cost < bcost) {
bcost = cost;
FFSWAP(uint8_t*, buf1, buf2);
FFSWAP(uint8_t *, buf1, buf2);
}
}
return buf2;
} else {
png_filter_row(&s->dsp, dst+1, pred, src, top, size, bpp);
png_filter_row(&s->dsp, dst + 1, pred, src, top, size, bpp);
dst[0] = pred;
return dst;
}
@@ -176,13 +178,13 @@ static void convert_from_rgb32(uint8_t *dst, const uint8_t *src, int width)
unsigned int v;

d = dst;
for(j = 0; j < width; j++) {
v = ((const uint32_t *)src)[j];
for (j = 0; j < width; j++) {
v = ((const uint32_t *) src)[j];
d[0] = v >> 16;
d[1] = v >> 8;
d[2] = v;
d[3] = v >> 24;
d += 4;
d += 4;
}
}

@@ -211,16 +213,17 @@ static int png_write_row(PNGEncContext *s, const uint8_t *data, int size)
int ret;

s->zstream.avail_in = size;
s->zstream.next_in = (uint8_t *)data;
s->zstream.next_in = (uint8_t *)data;
while (s->zstream.avail_in > 0) {
ret = deflate(&s->zstream, Z_NO_FLUSH);
if (ret != Z_OK)
return -1;
if (s->zstream.avail_out == 0) {
if(s->bytestream_end - s->bytestream > IOBUF_SIZE + 100)
png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, IOBUF_SIZE);
if (s->bytestream_end - s->bytestream > IOBUF_SIZE + 100)
png_write_chunk(&s->bytestream,
MKTAG('I', 'D', 'A', 'T'), s->buf, IOBUF_SIZE);
s->zstream.avail_out = IOBUF_SIZE;
s->zstream.next_out = s->buf;
s->zstream.next_out = s->buf;
}
}
return 0;
@@ -229,55 +232,55 @@ static int png_write_row(PNGEncContext *s, const uint8_t *data, int size)
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{
PNGEncContext *s = avctx->priv_data;
const AVFrame * const p = pict;
PNGEncContext *s = avctx->priv_data;
const AVFrame *const p = pict;
int bit_depth, color_type, y, len, row_size, ret, is_progressive;
int bits_per_pixel, pass_row_size, enc_row_size, max_packet_size;
int compression_level;
uint8_t *ptr, *top;
uint8_t *crow_base = NULL, *crow_buf, *crow;
uint8_t *ptr, *top, *crow_buf, *crow;
uint8_t *crow_base = NULL;
uint8_t *progressive_buf = NULL;
uint8_t *rgba_buf = NULL;
uint8_t *top_buf = NULL;
uint8_t *rgba_buf = NULL;
uint8_t *top_buf = NULL;

is_progressive = !!(avctx->flags & CODEC_FLAG_INTERLACED_DCT);
switch(avctx->pix_fmt) {
switch (avctx->pix_fmt) {
case AV_PIX_FMT_RGB32:
bit_depth = 8;
bit_depth = 8;
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
break;
case AV_PIX_FMT_RGB24:
bit_depth = 8;
bit_depth = 8;
color_type = PNG_COLOR_TYPE_RGB;
break;
case AV_PIX_FMT_GRAY16BE:
bit_depth = 16;
bit_depth = 16;
color_type = PNG_COLOR_TYPE_GRAY;
break;
case AV_PIX_FMT_GRAY8:
bit_depth = 8;
bit_depth = 8;
color_type = PNG_COLOR_TYPE_GRAY;
break;
case AV_PIX_FMT_MONOBLACK:
bit_depth = 1;
bit_depth = 1;
color_type = PNG_COLOR_TYPE_GRAY;
break;
case AV_PIX_FMT_PAL8:
bit_depth = 8;
bit_depth = 8;
color_type = PNG_COLOR_TYPE_PALETTE;
break;
default:
return -1;
}
bits_per_pixel = ff_png_get_nb_channels(color_type) * bit_depth;
row_size = (avctx->width * bits_per_pixel + 7) >> 3;
row_size = (avctx->width * bits_per_pixel + 7) >> 3;

s->zstream.zalloc = ff_png_zalloc;
s->zstream.zfree = ff_png_zfree;
s->zstream.zfree = ff_png_zfree;
s->zstream.opaque = NULL;
compression_level = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
Z_DEFAULT_COMPRESSION :
av_clip(avctx->compression_level, 0, 9);
compression_level = avctx->compression_level == FF_COMPRESSION_DEFAULT
? Z_DEFAULT_COMPRESSION
: av_clip(avctx->compression_level, 0, 9);
ret = deflateInit2(&s->zstream, compression_level,
Z_DEFLATED, 15, 8, Z_DEFAULT_STRATEGY);
if (ret != Z_OK)
@@ -301,7 +304,8 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
crow_base = av_malloc((row_size + 32) << (s->filter_type == PNG_FILTER_VALUE_MIXED));
if (!crow_base)
goto fail;
crow_buf = crow_base + 15; // pixel data should be aligned, but there's a control byte before it
// pixel data should be aligned, but there's a control byte before it
crow_buf = crow_base + 15;
if (is_progressive) {
progressive_buf = av_malloc(row_size + 1);
if (!progressive_buf)
@@ -324,8 +328,8 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,

AV_WB32(s->buf, avctx->width);
AV_WB32(s->buf + 4, avctx->height);
s->buf[8] = bit_depth;
s->buf[9] = color_type;
s->buf[8] = bit_depth;
s->buf[9] = color_type;
s->buf[10] = 0; /* compression type */
s->buf[11] = 0; /* filter type */
s->buf[12] = is_progressive; /* interlace type */
@@ -339,40 +343,42 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
uint32_t *palette;
uint8_t *alpha_ptr;

palette = (uint32_t *)p->data[1];
ptr = s->buf;
palette = (uint32_t *)p->data[1];
ptr = s->buf;
alpha_ptr = s->buf + 256 * 3;
has_alpha = 0;
for(i = 0; i < 256; i++) {
v = palette[i];
for (i = 0; i < 256; i++) {
v = palette[i];
alpha = v >> 24;
if (alpha && alpha != 0xff)
has_alpha = 1;
*alpha_ptr++ = alpha;
bytestream_put_be24(&ptr, v);
}
png_write_chunk(&s->bytestream, MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3);
png_write_chunk(&s->bytestream,
MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3);
if (has_alpha) {
png_write_chunk(&s->bytestream, MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256);
png_write_chunk(&s->bytestream,
MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256);
}
}

/* now put each row */
s->zstream.avail_out = IOBUF_SIZE;
s->zstream.next_out = s->buf;
s->zstream.next_out = s->buf;
if (is_progressive) {
int pass;

for(pass = 0; pass < NB_PASSES; pass++) {
for (pass = 0; pass < NB_PASSES; pass++) {
/* NOTE: a pass is completely omitted if no pixels would be
output */
* output */
pass_row_size = ff_png_pass_row_size(pass, bits_per_pixel, avctx->width);
if (pass_row_size > 0) {
top = NULL;
for(y = 0; y < avctx->height; y++) {
for (y = 0; y < avctx->height; y++)
if ((ff_png_pass_ymask[pass] << (y & 7)) & 0x80) {
ptr = p->data[0] + y * p->linesize[0];
FFSWAP(uint8_t*, progressive_buf, top_buf);
FFSWAP(uint8_t *, progressive_buf, top_buf);
if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
convert_from_rgb32(rgba_buf, ptr, avctx->width);
ptr = rgba_buf;
@@ -380,29 +386,30 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
png_get_interlaced_row(progressive_buf, pass_row_size,
bits_per_pixel, pass,
ptr, avctx->width);
crow = png_choose_filter(s, crow_buf, progressive_buf, top, pass_row_size, bits_per_pixel>>3);
crow = png_choose_filter(s, crow_buf, progressive_buf,
top, pass_row_size, bits_per_pixel >> 3);
png_write_row(s, crow, pass_row_size + 1);
top = progressive_buf;
}
}
}
}
} else {
top = NULL;
for(y = 0; y < avctx->height; y++) {
for (y = 0; y < avctx->height; y++) {
ptr = p->data[0] + y * p->linesize[0];
if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
FFSWAP(uint8_t*, rgba_buf, top_buf);
FFSWAP(uint8_t *, rgba_buf, top_buf);
convert_from_rgb32(rgba_buf, ptr, avctx->width);
ptr = rgba_buf;
}
crow = png_choose_filter(s, crow_buf, ptr, top, row_size, bits_per_pixel>>3);
crow = png_choose_filter(s, crow_buf, ptr, top,
row_size, bits_per_pixel >> 3);
png_write_row(s, crow, row_size + 1);
top = ptr;
}
}
/* compress last bytes */
for(;;) {
for (;;) {
ret = deflate(&s->zstream, Z_FINISH);
if (ret == Z_OK || ret == Z_STREAM_END) {
len = IOBUF_SIZE - s->zstream.avail_out;
@@ -410,7 +417,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, len);
}
s->zstream.avail_out = IOBUF_SIZE;
s->zstream.next_out = s->buf;
s->zstream.next_out = s->buf;
if (ret == Z_STREAM_END)
break;
} else {
@@ -424,19 +431,20 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
*got_packet = 1;
ret = 0;

the_end:
the_end:
av_free(crow_base);
av_free(progressive_buf);
av_free(rgba_buf);
av_free(top_buf);
deflateEnd(&s->zstream);
return ret;
fail:
fail:
ret = -1;
goto the_end;
}

static av_cold int png_enc_init(AVCodecContext *avctx){
static av_cold int png_enc_init(AVCodecContext *avctx)
{
PNGEncContext *s = avctx->priv_data;

avctx->coded_frame = av_frame_alloc();
@@ -448,8 +456,10 @@ static av_cold int png_enc_init(AVCodecContext *avctx){

ff_dsputil_init(&s->dsp, avctx);

s->filter_type = av_clip(avctx->prediction_method, PNG_FILTER_VALUE_NONE, PNG_FILTER_VALUE_MIXED);
if(avctx->pix_fmt == AV_PIX_FMT_MONOBLACK)
s->filter_type = av_clip(avctx->prediction_method,
PNG_FILTER_VALUE_NONE,
PNG_FILTER_VALUE_MIXED);
if (avctx->pix_fmt == AV_PIX_FMT_MONOBLACK)
s->filter_type = PNG_FILTER_VALUE_NONE;

return 0;
@@ -470,7 +480,7 @@ AVCodec ff_png_encoder = {
.init = png_enc_init,
.close = png_enc_close,
.encode2 = encode_frame,
.pix_fmts = (const enum AVPixelFormat[]){
.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB32, AV_PIX_FMT_PAL8, AV_PIX_FMT_GRAY8,
AV_PIX_FMT_GRAY16BE,
AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE


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