* 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;
- AVFrame picture;
+ GetByteContext gb;
+ AVFrame picture1, picture2;
+ AVFrame *current_picture, *last_picture;
int state;
int width, height;
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(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;
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);
+ 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);
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) {
}
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;
- AVFrame * const p= &s->picture;
+ AVFrame *p;
+ uint8_t *crow_buf_base = NULL;
uint32_t tag, length;
- int ret, crc;
+ int ret;
- s->bytestream_start=
- s->bytestream= buf;
- s->bytestream_end= buf + buf_size;
+ FFSWAP(AVFrame *, s->current_picture, s->last_picture);
+ avctx->coded_frame= s->current_picture;
+ p = s->current_picture;
/* 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;
+
+ bytestream2_init(&s->gb, buf + 8, buf_size - 8);
s->y=
s->state=0;
// memset(s, 0, sizeof(PNGDecContext));
if (ret != Z_OK)
return -1;
for(;;) {
- int tag32;
- if (s->bytestream >= s->bytestream_end)
+ 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
+ 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 = 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))
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_Y400A;
} else {
goto fail;
}
avctx->release_buffer(avctx, p);
p->reference= 0;
- if(avctx->get_buffer(avctx, p) < 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->pict_type= AV_PICTURE_TYPE_I;
p->key_frame= 1;
p->interlaced_frame = !!s->interlace_type;
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
+ 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 */
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->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'):
{
/* read the palette */
n = length / 3;
for(i=0;i<n;i++) {
- r = *s->bytestream++;
- g = *s->bytestream++;
- b = *s->bytestream++;
+ 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;
- crc = bytestream_get_be32(&s->bytestream);
+ bytestream2_skip(&s->gb, 4); /* crc */
}
break;
case MKTAG('t', 'R', 'N', 'S'):
!(s->state & PNG_PLTE))
goto skip_tag;
for(i=0;i<length;i++) {
- v = *s->bytestream++;
+ 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:
- *picture= s->picture;
- *data_size = sizeof(AVFrame);
+ /* handle p-frames only if a predecessor frame is available */
+ 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_last = s->last_picture->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;
+ }
+ }
+ }
+
+ *picture= *s->current_picture;
+ *got_frame = 1;
- ret = s->bytestream - s->bytestream_start;
+ 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;
static av_cold int png_dec_init(AVCodecContext *avctx){
PNGDecContext *s = avctx->priv_data;
- avcodec_get_frame_defaults(&s->picture);
- avctx->coded_frame= &s->picture;
- dsputil_init(&s->dsp, avctx);
+ s->current_picture = &s->picture1;
+ s->last_picture = &s->picture2;
+ avcodec_get_frame_defaults(&s->picture1);
+ avcodec_get_frame_defaults(&s->picture2);
+ ff_pngdsp_init(&s->dsp);
+
+ return 0;
+}
+
+static av_cold int png_dec_end(AVCodecContext *avctx)
+{
+ PNGDecContext *s = avctx->priv_data;
+
+ if (s->picture1.data[0])
+ avctx->release_buffer(avctx, &s->picture1);
+ if (s->picture2.data[0])
+ avctx->release_buffer(avctx, &s->picture2);
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,
- .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