#include "avcodec.h"
#include "bytestream.h"
#include "png.h"
+#include "pngdsp.h"
/* TODO:
* - add 16 bit depth support
#include <zlib.h>
+//#define DEBUG
+
+typedef struct PNGDecContext {
+ PNGDSPContext dsp;
+
+ const uint8_t *bytestream;
+ const uint8_t *bytestream_start;
+ const uint8_t *bytestream_end;
+ AVFrame picture1, picture2;
+ AVFrame *current_picture, *last_picture;
+
+ int state;
+ int width, height;
+ int bit_depth;
+ int color_type;
+ int compression_type;
+ int interlace_type;
+ int filter_type;
+ int channels;
+ int bits_per_pixel;
+ int bpp;
+
+ uint8_t *image_buf;
+ int image_linesize;
+ uint32_t palette[256];
+ uint8_t *crow_buf;
+ uint8_t *last_row;
+ uint8_t *tmp_row;
+ int pass;
+ int crow_size; /* compressed row size (include filter type) */
+ int row_size; /* decompressed row size */
+ int pass_row_size; /* decompress row size of the current pass */
+ int y;
+ z_stream zstream;
+} PNGDecContext;
+
/* Mask to determine which y pixels can be written in a pass */
static const uint8_t png_pass_dsp_ymask[NB_PASSES] = {
- 0xff, 0xff, 0x0f, 0xcc, 0x33, 0xff, 0x55,
+ 0xff, 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
};
/* Mask to determine which pixels to overwrite while displaying */
bpp = bits_per_pixel >> 3;
d = dst;
s = src;
- if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
- for(x = 0; x < width; x++) {
- j = x & 7;
- if ((dsp_mask << j) & 0x80) {
- *(uint32_t *)d = (s[3] << 24) | (s[0] << 16) | (s[1] << 8) | s[2];
- }
- d += bpp;
- if ((mask << j) & 0x80)
- s += bpp;
- }
- } else {
for(x = 0; x < width; x++) {
j = x & 7;
if ((dsp_mask << j) & 0x80) {
if ((mask << j) & 0x80)
s += bpp;
}
- }
break;
}
}
-// 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)
-
-static void add_bytes_l2_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w)
-{
- long i;
- for(i=0; i<=w-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);
- }
- for(; i<w; i++)
- dst[i] = src1[i]+src2[i];
-}
-
-static void add_paeth_prediction_c(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++) {
}
/* NOTE: 'dst' can be equal to 'last' */
-static void png_filter_row(PNGDecContext *s, uint8_t *dst, int filter_type,
+static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
uint8_t *src, uint8_t *last, int size, int bpp)
{
int i, p, r, g, b, a;
}
break;
case PNG_FILTER_VALUE_UP:
- s->add_bytes_l2(dst, src, last, size);
+ dsp->add_bytes_l2(dst, src, last, size);
break;
case PNG_FILTER_VALUE_AVG:
for(i = 0; i < bpp; i++) {
p = last[i];
dst[i] = p + src[i];
}
- if(bpp > 1 && size > 4) {
+ if(bpp > 2 && size > 4) {
// 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;
- s->add_paeth_prediction(dst+i, src+i, last+i, w-i, bpp);
+ dsp->add_paeth_prediction(dst+i, src+i, last+i, w-i, bpp);
i = w;
}
- add_paeth_prediction_c(dst+i, src+i, last+i, size-i, bpp);
+ ff_add_png_paeth_prediction(dst+i, src+i, last+i, size-i, bpp);
break;
}
}
-static av_always_inline void convert_to_rgb32_loco(uint8_t *dst, const uint8_t *src, int width, int loco)
-{
- int j;
- unsigned int r, g, b, a;
-
- for(j = 0;j < width; j++) {
- r = src[0];
- g = src[1];
- b = src[2];
- a = src[3];
- if(loco) {
- r = (r+g)&0xff;
- b = (b+g)&0xff;
- }
- *(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)
-{
- if(loco)
- convert_to_rgb32_loco(dst, src, width, 1);
- else
- convert_to_rgb32_loco(dst, src, width, 0);
+/* This used to be called "deloco" in FFmpeg
+ * and is actually an inverse reversible colorspace transformation */
+#define YUV2RGB(NAME, TYPE) \
+static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \
+{ \
+ int i; \
+ for (i = 0; i < size; i += 3 + alpha) { \
+ int g = dst [i+1]; \
+ dst[i+0] += g; \
+ dst[i+2] += g; \
+ } \
}
-static void deloco_rgb24(uint8_t *dst, int size)
-{
- int i;
- for(i=0; i<size; i+=3) {
- int g = dst[i+1];
- dst[i+0] += g;
- dst[i+2] += g;
- }
-}
+YUV2RGB(rgb8, uint8_t)
+YUV2RGB(rgb16, uint16_t)
/* process exactly one decompressed row */
static void png_handle_row(PNGDecContext *s)
if (!s->interlace_type) {
ptr = s->image_buf + s->image_linesize * s->y;
- /* need to swap bytes correctly for RGB_ALPHA */
- if (s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
- png_filter_row(s, 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);
- } else {
- /* in normal case, we avoid one copy */
if (s->y == 0)
last_row = s->last_row;
else
last_row = ptr - s->image_linesize;
- png_filter_row(s, ptr, s->crow_buf[0], s->crow_buf + 1,
+ png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1,
last_row, s->row_size, s->bpp);
- }
/* loco lags by 1 row so that it doesn't interfere with top prediction */
- if (s->filter_type == PNG_FILTER_TYPE_LOCO &&
- s->color_type == PNG_COLOR_TYPE_RGB && s->y > 0)
- deloco_rgb24(ptr - s->image_linesize, s->row_size);
+ if (s->filter_type == PNG_FILTER_TYPE_LOCO && s->y > 0) {
+ if (s->bit_depth == 16) {
+ deloco_rgb16((uint16_t *)(ptr - s->image_linesize), s->row_size / 2,
+ s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
+ } else {
+ deloco_rgb8(ptr - s->image_linesize, s->row_size,
+ s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
+ }
+ }
s->y++;
if (s->y == s->height) {
s->state |= PNG_ALLIMAGE;
- if (s->filter_type == PNG_FILTER_TYPE_LOCO &&
- s->color_type == PNG_COLOR_TYPE_RGB)
- deloco_rgb24(ptr, s->row_size);
+ if (s->filter_type == PNG_FILTER_TYPE_LOCO) {
+ if (s->bit_depth == 16) {
+ deloco_rgb16((uint16_t *)ptr, s->row_size / 2,
+ s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
+ } else {
+ deloco_rgb8(ptr, s->row_size,
+ s->color_type == PNG_COLOR_TYPE_RGB_ALPHA);
+ }
+ }
}
} else {
got_line = 0;
wait for the next one */
if (got_line)
break;
- png_filter_row(s, s->tmp_row, s->crow_buf[0], s->crow_buf + 1,
+ 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);
got_line = 1;
}
if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
- /* NOTE: RGB32 is handled directly in png_put_interlaced_row */
png_put_interlaced_row(ptr, s->width, s->bits_per_pixel, s->pass,
s->color_type, s->last_row);
}
goto fail;
tag32 = bytestream_get_be32(&s->bytestream);
tag = av_bswap32(tag32);
- av_dlog(avctx, "png: tag=%c%c%c%c length=%u\n",
+ if (avctx->debug & FF_DEBUG_STARTCODE)
+ av_log(avctx, AV_LOG_DEBUG, "png: tag=%c%c%c%c length=%u\n",
(tag & 0xff),
((tag >> 8) & 0xff),
((tag >> 16) & 0xff),
s->interlace_type = *s->bytestream++;
s->bytestream += 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",
+ if (avctx->debug & FF_DEBUG_PICT_INFO)
+ av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d 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;
s->bpp = (s->bits_per_pixel + 7) >> 3;
s->row_size = (avctx->width * s->bits_per_pixel + 7) >> 3;
- if (s->bit_depth == 8 &&
+ if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
s->color_type == PNG_COLOR_TYPE_RGB) {
avctx->pix_fmt = PIX_FMT_RGB24;
- } else if (s->bit_depth == 8 &&
+ } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
- avctx->pix_fmt = PIX_FMT_RGB32;
- } else if (s->bit_depth == 8 &&
+ avctx->pix_fmt = PIX_FMT_RGBA;
+ } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) &&
s->color_type == PNG_COLOR_TYPE_GRAY) {
avctx->pix_fmt = PIX_FMT_GRAY8;
} else if (s->bit_depth == 16 &&
} else if (s->bit_depth == 16 &&
s->color_type == PNG_COLOR_TYPE_RGB) {
avctx->pix_fmt = PIX_FMT_RGB48BE;
- } else if (s->bit_depth == 1) {
- avctx->pix_fmt = PIX_FMT_MONOBLACK;
+ } else if (s->bit_depth == 16 &&
+ s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
+ avctx->pix_fmt = PIX_FMT_RGBA64BE;
} else if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
avctx->pix_fmt = PIX_FMT_PAL8;
+ } else if (s->bit_depth == 1) {
+ avctx->pix_fmt = PIX_FMT_MONOBLACK;
} else if (s->bit_depth == 8 &&
s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
avctx->pix_fmt = PIX_FMT_GRAY8A;
} else {
+ av_log(avctx, AV_LOG_ERROR, "unsupported bit depth %d "
+ "and color type %d\n",
+ s->bit_depth, s->color_type);
goto fail;
}
if(p->data[0])
}
exit_loop:
+ if(s->bits_per_pixel == 1 && s->color_type == PNG_COLOR_TYPE_PALETTE){
+ int i, j;
+ uint8_t *pd = s->current_picture->data[0];
+ for(j=0; j < s->height; j++) {
+ for(i=s->width/8-1; i>=0; i--) {
+ pd[8*i+7]= pd[i] &1;
+ pd[8*i+6]= (pd[i]>>1)&1;
+ pd[8*i+5]= (pd[i]>>2)&1;
+ pd[8*i+4]= (pd[i]>>3)&1;
+ pd[8*i+3]= (pd[i]>>4)&1;
+ pd[8*i+2]= (pd[i]>>5)&1;
+ pd[8*i+1]= (pd[i]>>6)&1;
+ pd[8*i+0]= pd[i]>>7;
+ }
+ pd += s->image_linesize;
+ }
+ }
if(s->bits_per_pixel == 2){
int i, j;
uint8_t *pd = s->current_picture->data[0];
for(j=0; j < s->height; j++) {
+ if (s->color_type == PNG_COLOR_TYPE_PALETTE){
for(i=s->width/4-1; i>=0; i--) {
pd[4*i+3]= pd[i] &3;
pd[4*i+2]= (pd[i]>>2)&3;
pd[4*i+1]= (pd[i]>>4)&3;
pd[4*i+0]= pd[i]>>6;
}
+ } else {
+ for(i=s->width/4-1; i>=0; i--) {
+ pd[4*i+3]= ( pd[i] &3)*0x55;
+ pd[4*i+2]= ((pd[i]>>2)&3)*0x55;
+ pd[4*i+1]= ((pd[i]>>4)&3)*0x55;
+ pd[4*i+0]= ( pd[i]>>6 )*0x55;
+ }
+ }
pd += s->image_linesize;
}
}
int i, j;
uint8_t *pd = s->current_picture->data[0];
for(j=0; j < s->height; j++) {
+ if (s->color_type == PNG_COLOR_TYPE_PALETTE){
for(i=s->width/2-1; i>=0; i--) {
pd[2*i+1]= pd[i]&15;
pd[2*i+0]= pd[i]>>4;
}
+ } else {
+ for(i=s->width/2-1; i>=0; i--) {
+ pd[2*i+1]= (pd[i]&15)*0x11;
+ pd[2*i+0]= (pd[i]>>4)*0x11;
+ }
+ }
pd += s->image_linesize;
}
}
avcodec_get_frame_defaults(&s->picture1);
avcodec_get_frame_defaults(&s->picture2);
-#if HAVE_MMX
- ff_png_init_mmx(s);
-#endif
-
- if (!s->add_paeth_prediction)
- s->add_paeth_prediction = add_paeth_prediction_c;
- if (!s->add_bytes_l2)
- s->add_bytes_l2 = add_bytes_l2_c;
+ ff_pngdsp_init(&s->dsp);
return 0;
}
projects / ffmpeg / blobdiff