/*
* PNG image format
- * Copyright (c) 2003 Fabrice Bellard.
+ * Copyright (c) 2003 Fabrice Bellard
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
+#include "internal.h"
#include "png.h"
+#include "pngdsp.h"
/* TODO:
* - add 2, 4 and 16 bit depth support
#include <zlib.h>
-//#define DEBUG
-
typedef struct PNGDecContext {
- uint8_t *bytestream;
- uint8_t *bytestream_start;
- uint8_t *bytestream_end;
- AVFrame picture;
+ PNGDSPContext dsp;
+
+ GetByteContext gb;
+ AVFrame *prev;
int state;
int width, height;
};
/* NOTE: we try to construct a good looking image at each pass. width
- is the original image width. We also do pixel format convertion 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)
uint8_t *d;
const uint8_t *s;
- mask = ff_png_pass_mask[pass];
+ mask = ff_png_pass_mask[pass];
dsp_mask = png_pass_dsp_mask[pass];
- switch(bits_per_pixel) {
+
+ switch (bits_per_pixel) {
case 1:
/* we must initialize the line to zero before writing to it */
if (pass == 0)
memset(dst, 0, (width + 7) >> 3);
src_x = 0;
- for(x = 0; x < width; x++) {
+ for (x = 0; x < width; x++) {
j = (x & 7);
if ((dsp_mask << j) & 0x80) {
b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1;
break;
default:
bpp = bits_per_pixel >> 3;
- d = dst;
- s = src;
+ d = dst;
+ s = src;
if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
- for(x = 0; x < width; x++) {
+ 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];
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);
}
}
-/* XXX: optimize */
+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++) {
+ int a, b, c, p, pa, pb, pc;
+
+ a = dst[i - bpp];
+ b = top[i];
+ c = top[i - bpp];
+
+ p = b - c;
+ pc = a - c;
+
+ pa = abs(p);
+ pb = abs(pc);
+ pc = abs(p + pc);
+
+ if (pa <= pb && pa <= pc)
+ p = a;
+ else if (pb <= pc)
+ p = b;
+ else
+ p = c;
+ dst[i] = p + src[i];
+ }
+}
+
+#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]); \
+ } \
+ }
+
/* NOTE: 'dst' can be equal to 'last' */
-static void png_filter_row(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;
+ int i, p, r, g, b, a;
- switch(filter_type) {
+ switch (filter_type) {
case PNG_FILTER_VALUE_NONE:
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];
- }
- for(i = bpp; i < size; i++) {
- p = dst[i - bpp];
- dst[i] = p + src[i];
+ if (bpp == 4) {
+ p = *(int *)dst;
+ for (; i < size; i += bpp) {
+ int s = *(int *)(src + i);
+ p = ((s & 0x7f7f7f7f) + (p & 0x7f7f7f7f)) ^ ((s ^ p) & 0x80808080);
+ *(int *)(dst + i) = p;
+ }
+ } else {
+#define OP_SUB(x, s, l) x + s
+ UNROLL_FILTER(OP_SUB);
}
break;
case PNG_FILTER_VALUE_UP:
- for(i = 0; i < size; i++) {
- p = last[i];
- dst[i] = p + src[i];
- }
+ dsp->add_bytes_l2(dst, src, last, size);
break;
case PNG_FILTER_VALUE_AVG:
- for(i = 0; i < bpp; i++) {
- p = (last[i] >> 1);
- dst[i] = p + src[i];
- }
- for(i = bpp; i < size; i++) {
- p = ((dst[i - bpp] + last[i]) >> 1);
+ for (i = 0; i < bpp; i++) {
+ p = (last[i] >> 1);
dst[i] = p + src[i];
}
+#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];
+ for (i = 0; i < bpp; i++) {
+ p = last[i];
dst[i] = p + src[i];
}
- for(i = bpp; i < size; i++) {
- int a, b, c, pa, pb, pc;
-
- a = dst[i - bpp];
- b = last[i];
- c = last[i - bpp];
-
- p = b - c;
- pc = a - c;
-
- pa = abs(p);
- pb = abs(pc);
- pc = abs(p + pc);
-
- if (pa <= pb && pa <= pc)
- p = a;
- else if (pb <= pc)
- p = b;
- else
- p = c;
- dst[i] = p + src[i];
+ 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;
+ dsp->add_paeth_prediction(dst + i, src + i, last + i, w - i, bpp);
+ i = w;
}
+ ff_add_png_paeth_prediction(dst + i, src + i, last + i, size - i, bpp);
break;
}
}
-static void convert_to_rgb32(uint8_t *dst, const uint8_t *src, int width)
+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++) {
+ for (j = 0; j < width; j++) {
r = src[0];
g = src[1];
b = src[2];
a = src[3];
- *(uint32_t *)dst = (a << 24) | (r << 16) | (g << 8) | b;
+ 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);
+}
+
+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;
+ }
+}
+
/* process exactly one decompressed row */
static void png_handle_row(PNGDecContext *s)
{
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->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->row_size, s->bpp);
- memcpy(s->last_row, s->tmp_row, s->row_size);
- convert_to_rgb32(ptr, s->tmp_row, s->width);
+ 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)
else
last_row = ptr - s->image_linesize;
- png_filter_row(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);
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);
}
} else {
got_line = 0;
- for(;;) {
+ for (;;) {
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->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);
- memcpy(s->last_row, s->tmp_row, s->pass_row_size);
+ FFSWAP(uint8_t *, s->last_row, s->tmp_row);
got_line = 1;
}
if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) {
}
s->y++;
if (s->y == s->height) {
- for(;;) {
+ for (;;) {
if (s->pass == NB_PASSES - 1) {
s->state |= PNG_ALLIMAGE;
goto the_end;
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;
}
}
}
- the_end: ;
+the_end:;
}
}
static int png_decode_idat(PNGDecContext *s, int length)
{
int ret;
- s->zstream.avail_in = length;
- s->zstream.next_in = s->bytestream;
- s->bytestream += length;
-
- if(s->bytestream > s->bytestream_end)
- return -1;
+ s->zstream.avail_in = FFMIN(length, bytestream2_get_bytes_left(&s->gb));
+ s->zstream.next_in = s->gb.buffer;
+ bytestream2_skip(&s->gb, length);
/* decode one line if possible */
while (s->zstream.avail_in > 0) {
png_handle_row(s);
}
s->zstream.avail_out = s->crow_size;
- s->zstream.next_out = s->crow_buf;
+ 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);
+ return 0;
}
}
return 0;
}
static int decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ void *data, int *got_frame,
+ AVPacket *avpkt)
{
- PNGDecContext * const s = avctx->priv_data;
- AVFrame *picture = data;
- AVFrame * const p= (AVFrame*)&s->picture;
+ 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, crc;
-
- s->bytestream_start=
- s->bytestream= buf;
- s->bytestream_end= buf + buf_size;
+ int ret;
/* check signature */
- if (memcmp(s->bytestream, ff_pngsig, 8) != 0)
- return -1;
- s->bytestream+= 8;
- s->y=
- s->state=0;
-// memset(s, 0, sizeof(PNGDecContext));
+ if (buf_size < 8 ||
+ (memcmp(buf, ff_pngsig, 8) != 0 && memcmp(buf, ff_mngsig, 8) != 0)) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature (%d).\n", buf_size);
+ return AVERROR_INVALIDDATA;
+ }
+
+ bytestream2_init(&s->gb, buf + 8, buf_size - 8);
+ s->y = s->state = 0;
+
/* init the zlib */
s->zstream.zalloc = ff_png_zalloc;
- s->zstream.zfree = ff_png_zfree;
+ s->zstream.zfree = ff_png_zfree;
s->zstream.opaque = NULL;
ret = inflateInit(&s->zstream);
if (ret != Z_OK)
return -1;
- for(;;) {
- int tag32;
- if (s->bytestream >= s->bytestream_end)
+ for (;;) {
+ if (bytestream2_get_bytes_left(&s->gb) <= 0)
goto fail;
- length = bytestream_get_be32(&s->bytestream);
+ length = bytestream2_get_be32(&s->gb);
if (length > 0x7fffffff)
goto fail;
- tag32 = bytestream_get_be32(&s->bytestream);
- tag = bswap_32(tag32);
-#ifdef DEBUG
- av_log(avctx, AV_LOG_DEBUG, "png: tag=%c%c%c%c length=%u\n",
- (tag & 0xff),
- ((tag >> 8) & 0xff),
- ((tag >> 16) & 0xff),
- ((tag >> 24) & 0xff), length);
-#endif
- switch(tag) {
+ tag = bytestream2_get_le32(&s->gb);
+ av_dlog(avctx, "png: tag=%c%c%c%c length=%u\n",
+ (tag & 0xff),
+ ((tag >> 8) & 0xff),
+ ((tag >> 16) & 0xff),
+ ((tag >> 24) & 0xff), length);
+ switch (tag) {
case MKTAG('I', 'H', 'D', 'R'):
if (length != 13)
goto fail;
- s->width = bytestream_get_be32(&s->bytestream);
- s->height = bytestream_get_be32(&s->bytestream);
- if(avcodec_check_dimensions(avctx, s->width, s->height)){
- s->width= s->height= 0;
+ s->width = bytestream2_get_be32(&s->gb);
+ s->height = bytestream2_get_be32(&s->gb);
+ if (av_image_check_size(s->width, s->height, 0, avctx)) {
+ s->width = s->height = 0;
goto fail;
}
- s->bit_depth = *s->bytestream++;
- s->color_type = *s->bytestream++;
- s->compression_type = *s->bytestream++;
- s->filter_type = *s->bytestream++;
- s->interlace_type = *s->bytestream++;
- crc = bytestream_get_be32(&s->bytestream);
+ s->bit_depth = bytestream2_get_byte(&s->gb);
+ s->color_type = bytestream2_get_byte(&s->gb);
+ s->compression_type = bytestream2_get_byte(&s->gb);
+ s->filter_type = bytestream2_get_byte(&s->gb);
+ s->interlace_type = bytestream2_get_byte(&s->gb);
+ bytestream2_skip(&s->gb, 4); /* crc */
s->state |= PNG_IHDR;
-#ifdef DEBUG
- 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);
-#endif
+ av_dlog(avctx, "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;
case MKTAG('I', 'D', 'A', 'T'):
if (!(s->state & PNG_IHDR))
goto fail;
if (!(s->state & PNG_IDAT)) {
/* init image info */
- avctx->width = s->width;
+ avctx->width = s->width;
avctx->height = s->height;
- s->channels = ff_png_get_nb_channels(s->color_type);
+ s->channels = ff_png_get_nb_channels(s->color_type);
s->bits_per_pixel = s->bit_depth * s->channels;
- s->bpp = (s->bits_per_pixel + 7) >> 3;
- s->row_size = (avctx->width * s->bits_per_pixel + 7) >> 3;
+ s->bpp = (s->bits_per_pixel + 7) >> 3;
+ s->row_size = (avctx->width * s->bits_per_pixel + 7) >> 3;
if (s->bit_depth == 8 &&
s->color_type == PNG_COLOR_TYPE_RGB) {
- avctx->pix_fmt = PIX_FMT_RGB24;
+ avctx->pix_fmt = AV_PIX_FMT_RGB24;
} else if (s->bit_depth == 8 &&
s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
- avctx->pix_fmt = PIX_FMT_RGB32;
+ avctx->pix_fmt = AV_PIX_FMT_RGB32;
} else if (s->bit_depth == 8 &&
s->color_type == PNG_COLOR_TYPE_GRAY) {
- avctx->pix_fmt = PIX_FMT_GRAY8;
+ avctx->pix_fmt = AV_PIX_FMT_GRAY8;
} else if (s->bit_depth == 16 &&
s->color_type == PNG_COLOR_TYPE_GRAY) {
- avctx->pix_fmt = PIX_FMT_GRAY16BE;
+ avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
+ } else if (s->bit_depth == 16 &&
+ s->color_type == PNG_COLOR_TYPE_RGB) {
+ avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
} else if (s->bit_depth == 1 &&
s->color_type == PNG_COLOR_TYPE_GRAY) {
- avctx->pix_fmt = PIX_FMT_MONOBLACK;
- } else if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
- avctx->pix_fmt = PIX_FMT_PAL8;
+ avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
+ } else if (s->bit_depth == 8 &&
+ s->color_type == PNG_COLOR_TYPE_PALETTE) {
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
+ } else if (s->bit_depth == 8 &&
+ s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
+ avctx->pix_fmt = AV_PIX_FMT_YA8;
+ } else if (s->bit_depth == 16 &&
+ s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
+ avctx->pix_fmt = AV_PIX_FMT_YA16BE;
} else {
goto fail;
}
- if(p->data[0])
- avctx->release_buffer(avctx, p);
- p->reference= 0;
- if(avctx->get_buffer(avctx, p) < 0){
+ if (ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
goto fail;
}
- p->pict_type= FF_I_TYPE;
- p->key_frame= 1;
+ p->pict_type = AV_PICTURE_TYPE_I;
+ p->key_frame = 1;
p->interlaced_frame = !!s->interlace_type;
/* compute the compressed row size */
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;
}
-#ifdef DEBUG
- av_log(avctx, AV_LOG_DEBUG, "row_size=%d crow_size =%d\n",
- s->row_size, s->crow_size);
-#endif
- s->image_buf = p->data[0];
+ av_dlog(avctx, "row_size=%d crow_size =%d\n",
+ s->row_size, s->crow_size);
+ s->image_buf = p->data[0];
s->image_linesize = p->linesize[0];
/* copy the palette if needed */
if (s->color_type == PNG_COLOR_TYPE_PALETTE)
goto fail;
}
/* compressed row */
- s->crow_buf = av_malloc(s->row_size + 1);
- if (!s->crow_buf)
+ crow_buf_base = av_malloc(s->row_size + 16);
+ if (!crow_buf_base)
goto fail;
+
+ /* we want crow_buf+1 to be 16-byte aligned */
+ s->crow_buf = crow_buf_base + 15;
s->zstream.avail_out = s->crow_size;
- s->zstream.next_out = s->crow_buf;
+ s->zstream.next_out = s->crow_buf;
}
s->state |= PNG_IDAT;
if (png_decode_idat(s, length) < 0)
goto fail;
- /* skip crc */
- crc = bytestream_get_be32(&s->bytestream);
+ 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 = *s->bytestream++;
- g = *s->bytestream++;
- b = *s->bytestream++;
- s->palette[i] = (0xff << 24) | (r << 16) | (g << 8) | b;
- }
- for(;i<256;i++) {
- s->palette[i] = (0xff << 24);
- }
- s->state |= PNG_PLTE;
- crc = bytestream_get_be32(&s->bytestream);
+ {
+ 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 = *s->bytestream++;
- s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
- }
- crc = bytestream_get_be32(&s->bytestream);
+ {
+ 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;
- crc = bytestream_get_be32(&s->bytestream);
+ bytestream2_skip(&s->gb, 4); /* crc */
goto exit_loop;
default:
/* skip tag */
- skip_tag:
- s->bytestream += length + 4;
+skip_tag:
+ bytestream2_skip(&s->gb, length + 4);
break;
}
}
- exit_loop:
- *picture= *(AVFrame*)&s->picture;
- *data_size = sizeof(AVPicture);
+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++)
+ 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;
- ret = s->bytestream - s->bytestream_start;
- the_end:
+ *got_frame = 1;
+
+ ret = bytestream2_tell(&s->gb);
+the_end:
inflateEnd(&s->zstream);
- av_freep(&s->crow_buf);
+ 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;
}
-static int png_dec_init(AVCodecContext *avctx){
+static av_cold int png_dec_init(AVCodecContext *avctx)
+{
+ PNGDecContext *s = avctx->priv_data;
+
+ s->prev = av_frame_alloc();
+ if (!s->prev)
+ return AVERROR(ENOMEM);
+
+ ff_pngdsp_init(&s->dsp);
+
+ return 0;
+}
+
+static av_cold int png_dec_end(AVCodecContext *avctx)
+{
PNGDecContext *s = avctx->priv_data;
- avcodec_get_frame_defaults((AVFrame*)&s->picture);
- avctx->coded_frame= (AVFrame*)&s->picture;
+ av_frame_free(&s->prev);
return 0;
}
-AVCodec png_decoder = {
- "png",
- CODEC_TYPE_VIDEO,
- CODEC_ID_PNG,
- sizeof(PNGDecContext),
- png_dec_init,
- NULL,
- NULL, //decode_end,
- decode_frame,
- 0 /*CODEC_CAP_DR1*/ /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
- NULL
+AVCodec ff_png_decoder = {
+ .name = "png",
+ .long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_PNG,
+ .priv_data_size = sizeof(PNGDecContext),
+ .init = png_dec_init,
+ .close = png_dec_end,
+ .decode = decode_frame,
+ .capabilities = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
};
projects / ffmpeg / blobdiff