* PNG image format
* 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 "dsputil.h"
+#include "pngdsp.h"
/* TODO:
* - add 2, 4 and 16 bit depth support
//#define DEBUG
typedef struct PNGDecContext {
- DSPContext dsp;
+ PNGDSPContext dsp;
- const uint8_t *bytestream;
- const uint8_t *bytestream_start;
- const uint8_t *bytestream_end;
+ GetByteContext gb;
AVFrame picture1, picture2;
AVFrame *current_picture, *last_picture;
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];
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++) {
+ 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;
+ p = b - c;
pc = a - c;
pa = abs(p);
}
/* NOTE: 'dst' can be equal to 'last' */
-static void png_filter_row(DSPContext *dsp, 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;
- 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];
}
- if(bpp == 4) {
+ 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;
+ 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
dsp->add_bytes_l2(dst, src, last, size);
break;
case PNG_FILTER_VALUE_AVG:
- for(i = 0; i < bpp; i++) {
+ for (i = 0; i < bpp; i++) {
p = (last[i] >> 1);
dst[i] = p + src[i];
}
UNROLL_FILTER(OP_AVG);
break;
case PNG_FILTER_VALUE_PAETH:
- for(i = 0; i < bpp; i++) {
+ for (i = 0; i < bpp; i++) {
p = last[i];
dst[i] = p + src[i];
}
- if(bpp > 1 && size > 4) {
+ if (bpp > 1 && 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_png_paeth_prediction(dst+i, src+i, last+i, w-i, bpp);
+ 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);
+ 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)
+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];
- if(loco) {
- r = (r+g)&0xff;
- b = (b+g)&0xff;
+ if (loco) {
+ r = (r + g) & 0xff;
+ b = (b + g) & 0xff;
}
*(uint32_t *)dst = (a << 24) | (r << 16) | (g << 8) | b;
dst += 4;
static void convert_to_rgb32(uint8_t *dst, const uint8_t *src, int width, int loco)
{
- if(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;
+ for (i = 0; i < size; i += 3) {
+ int g = dst[i + 1];
+ dst[i + 0] += g;
+ dst[i + 2] += g;
}
}
}
} 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
}
s->y++;
if (s->y == s->height) {
- for(;;) {
+ for (;;) {
if (s->pass == NB_PASSES - 1) {
s->state |= PNG_ALLIMAGE;
goto 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;
}
}
return 0;
}
static int decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
+ void *data, int *got_frame,
AVPacket *avpkt)
{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
PNGDecContext * const s = avctx->priv_data;
- AVFrame *picture = data;
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ AVFrame *picture = data;
+ uint8_t *crow_buf_base = NULL;
AVFrame *p;
- uint8_t *crow_buf_base = NULL;
uint32_t tag, length;
- int ret, crc;
+ int ret;
FFSWAP(AVFrame *, s->current_picture, s->last_picture);
- avctx->coded_frame= s->current_picture;
+ avctx->coded_frame = s->current_picture;
p = s->current_picture;
- s->bytestream_start=
- s->bytestream= buf;
- s->bytestream_end= buf + buf_size;
-
/* check signature */
- if (memcmp(s->bytestream, ff_pngsig, 8) != 0 &&
- memcmp(s->bytestream, ff_mngsig, 8) != 0)
+ if (buf_size < 8 ||
+ memcmp(buf, ff_pngsig, 8) != 0 &&
+ memcmp(buf, ff_mngsig, 8) != 0)
return -1;
- s->bytestream+= 8;
- s->y=
- s->state=0;
-// memset(s, 0, sizeof(PNGDecContext));
+
+ 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);
- dprintf(avctx, "png: tag=%c%c%c%c length=%u\n",
+ 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) {
+ 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;
- dprintf(avctx, "width=%d height=%d depth=%d color_type=%d compression_type=%d filter_type=%d interlace_type=%d\n",
+ 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;
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 = PIX_FMT_RGB48BE;
+ 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_Y400A;
} else {
goto fail;
}
- if(p->data[0])
+ if (p->data[0])
avctx->release_buffer(avctx, p);
- p->reference= 0;
- if(avctx->get_buffer(avctx, p) < 0){
+ p->reference = 0;
+ if (ff_get_buffer(avctx, p) < 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 */
s->width);
s->crow_size = s->pass_row_size + 1;
}
- dprintf(avctx, "row_size=%d crow_size =%d\n",
+ av_dlog(avctx, "row_size=%d crow_size =%d\n",
s->row_size, s->crow_size);
- s->image_buf = p->data[0];
+ 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;
/* we want crow_buf+1 to be 16-byte aligned */
- s->crow_buf = crow_buf_base + 15;
+ 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'):
{
goto skip_tag;
/* read the palette */
n = length / 3;
- for(i=0;i<n;i++) {
- r = *s->bytestream++;
- g = *s->bytestream++;
- b = *s->bytestream++;
+ 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++) {
+ for (; i < 256; i++) {
s->palette[i] = (0xff << 24);
}
s->state |= PNG_PLTE;
- crc = bytestream_get_be32(&s->bytestream);
+ bytestream2_skip(&s->gb, 4); /* crc */
}
break;
case MKTAG('t', 'R', 'N', 'S'):
length > 256 ||
!(s->state & PNG_PLTE))
goto skip_tag;
- for(i=0;i<length;i++) {
- v = *s->bytestream++;
+ for (i = 0; i < length; i++) {
+ v = bytestream2_get_byte(&s->gb);
s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
}
- crc = bytestream_get_be32(&s->bytestream);
+ 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;
+ bytestream2_skip(&s->gb, length + 4);
break;
}
}
exit_loop:
/* handle p-frames only if a predecessor frame is available */
- if(s->last_picture->data[0] != NULL) {
- if(!(avpkt->flags & PKT_FLAG_KEY)) {
+ if (s->last_picture->data[0] != NULL) {
+ if (!(avpkt->flags & AV_PKT_FLAG_KEY)) {
int i, j;
- uint8_t *pd = s->current_picture->data[0];
+ uint8_t *pd = s->current_picture->data[0];
uint8_t *pd_last = s->last_picture->data[0];
- for(j=0; j < s->height; j++) {
- for(i=0; i < s->width * s->bpp; i++) {
+ 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 += s->image_linesize;
pd_last += s->image_linesize;
}
}
}
- *picture= *s->current_picture;
- *data_size = sizeof(AVFrame);
+ *picture = *s->current_picture;
+ *got_frame = 1;
- ret = s->bytestream - s->bytestream_start;
+ ret = bytestream2_tell(&s->gb);
the_end:
inflateEnd(&s->zstream);
av_free(crow_buf_base);
goto the_end;
}
-static av_cold int png_dec_init(AVCodecContext *avctx){
+static av_cold int png_dec_init(AVCodecContext *avctx)
+{
PNGDecContext *s = avctx->priv_data;
s->current_picture = &s->picture1;
- s->last_picture = &s->picture2;
+ s->last_picture = &s->picture2;
avcodec_get_frame_defaults(&s->picture1);
avcodec_get_frame_defaults(&s->picture2);
- dsputil_init(&s->dsp, avctx);
+ ff_pngdsp_init(&s->dsp);
return 0;
}
return 0;
}
-AVCodec png_decoder = {
- "png",
- CODEC_TYPE_VIDEO,
- CODEC_ID_PNG,
- sizeof(PNGDecContext),
- png_dec_init,
- NULL,
- png_dec_end,
- decode_frame,
- CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
- NULL,
- .long_name = NULL_IF_CONFIG_SMALL("PNG image"),
+AVCodec ff_png_decoder = {
+ .name = "png",
+ .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*/,
+ .long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
};
projects / ffmpeg / blobdiff