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-rw-r--r--libavcodec/pngenc.c145
1 files changed, 91 insertions, 54 deletions
diff --git a/libavcodec/pngenc.c b/libavcodec/pngenc.c
index f58f7158a3..bf61be1609 100644
--- a/libavcodec/pngenc.c
+++ b/libavcodec/pngenc.c
@@ -2,36 +2,37 @@
* PNG image format
* Copyright (c) 2003 Fabrice Bellard
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
+#include "internal.h"
#include "bytestream.h"
#include "dsputil.h"
#include "png.h"
-/* TODO:
- * - add 2, 4 and 16 bit depth support
- */
+#include "libavutil/avassert.h"
+#include "libavutil/opt.h"
#include <zlib.h>
#define IOBUF_SIZE 4096
typedef struct PNGEncContext {
+ AVClass *class;
DSPContext dsp;
uint8_t *bytestream;
@@ -42,6 +43,8 @@ typedef struct PNGEncContext {
z_stream zstream;
uint8_t buf[IOBUF_SIZE];
+ int dpi; ///< Physical pixel density, in dots per inch, if set
+ int dpm; ///< Physical pixel density, in dots per meter, if set
} PNGEncContext;
static void png_get_interlaced_row(uint8_t *dst, int row_size,
@@ -51,8 +54,9 @@ static void png_get_interlaced_row(uint8_t *dst, int row_size,
int x, mask, dst_x, j, b, bpp;
uint8_t *d;
const uint8_t *s;
+ static const int masks[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
- mask = ff_png_pass_mask[pass];
+ mask = masks[pass];
switch(bits_per_pixel) {
case 1:
memset(dst, 0, row_size);
@@ -143,7 +147,7 @@ static uint8_t *png_choose_filter(PNGEncContext *s, uint8_t *dst,
uint8_t *src, uint8_t *top, int size, int bpp)
{
int pred = s->filter_type;
- assert(bpp || !pred);
+ av_assert0(bpp || !pred);
if(!top && pred)
pred = PNG_FILTER_VALUE_SUB;
if(pred == PNG_FILTER_VALUE_MIXED) {
@@ -169,23 +173,6 @@ static uint8_t *png_choose_filter(PNGEncContext *s, uint8_t *dst,
}
}
-static void convert_from_rgb32(uint8_t *dst, const uint8_t *src, int width)
-{
- uint8_t *d;
- int j;
- unsigned int v;
-
- d = dst;
- 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;
- }
-}
-
static void png_write_chunk(uint8_t **f, uint32_t tag,
const uint8_t *buf, int length)
{
@@ -232,17 +219,25 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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 bits_per_pixel, pass_row_size, enc_row_size;
+ int64_t max_packet_size;
int compression_level;
uint8_t *ptr, *top;
uint8_t *crow_base = NULL, *crow_buf, *crow;
uint8_t *progressive_buf = NULL;
- uint8_t *rgba_buf = NULL;
uint8_t *top_buf = NULL;
is_progressive = !!(avctx->flags & CODEC_FLAG_INTERLACED_DCT);
switch(avctx->pix_fmt) {
- case AV_PIX_FMT_RGB32:
+ case AV_PIX_FMT_RGBA64BE:
+ bit_depth = 16;
+ color_type = PNG_COLOR_TYPE_RGB_ALPHA;
+ break;
+ case AV_PIX_FMT_RGB48BE:
+ bit_depth = 16;
+ color_type = PNG_COLOR_TYPE_RGB;
+ break;
+ case AV_PIX_FMT_RGBA:
bit_depth = 8;
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
break;
@@ -258,6 +253,10 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
bit_depth = 8;
color_type = PNG_COLOR_TYPE_GRAY;
break;
+ case AV_PIX_FMT_GRAY8A:
+ bit_depth = 8;
+ color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
+ break;
case AV_PIX_FMT_MONOBLACK:
bit_depth = 1;
color_type = PNG_COLOR_TYPE_GRAY;
@@ -284,15 +283,13 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
return -1;
enc_row_size = deflateBound(&s->zstream, row_size);
- max_packet_size = avctx->height * (enc_row_size +
+ max_packet_size = avctx->height * (int64_t)(enc_row_size +
((enc_row_size + IOBUF_SIZE - 1) / IOBUF_SIZE) * 12)
+ FF_MIN_BUFFER_SIZE;
- if (!pkt->data &&
- (ret = av_new_packet(pkt, max_packet_size)) < 0) {
- av_log(avctx, AV_LOG_ERROR, "Could not allocate output packet of size %d.\n",
- max_packet_size);
+ if (max_packet_size > INT_MAX)
+ return AVERROR(ENOMEM);
+ if ((ret = ff_alloc_packet2(avctx, pkt, max_packet_size)) < 0)
return ret;
- }
s->bytestream_start =
s->bytestream = pkt->data;
@@ -307,19 +304,14 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
if (!progressive_buf)
goto fail;
}
- if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
- rgba_buf = av_malloc(row_size + 1);
- if (!rgba_buf)
- goto fail;
- }
- if (is_progressive || color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
+ if (is_progressive) {
top_buf = av_malloc(row_size + 1);
if (!top_buf)
goto fail;
}
/* write png header */
- memcpy(s->bytestream, ff_pngsig, 8);
+ AV_WB64(s->bytestream, PNGSIG);
s->bytestream += 8;
AV_WB32(s->buf, avctx->width);
@@ -332,6 +324,17 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
png_write_chunk(&s->bytestream, MKTAG('I', 'H', 'D', 'R'), s->buf, 13);
+ if (s->dpm) {
+ AV_WB32(s->buf, s->dpm);
+ AV_WB32(s->buf + 4, s->dpm);
+ s->buf[8] = 1; /* unit specifier is meter */
+ } else {
+ AV_WB32(s->buf, avctx->sample_aspect_ratio.num);
+ AV_WB32(s->buf + 4, avctx->sample_aspect_ratio.den);
+ s->buf[8] = 0; /* unit specifier is unknown */
+ }
+ png_write_chunk(&s->bytestream, MKTAG('p', 'H', 'Y', 's'), s->buf, 9);
+
/* put the palette if needed */
if (color_type == PNG_COLOR_TYPE_PALETTE) {
int has_alpha, alpha, i;
@@ -346,7 +349,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
for(i = 0; i < 256; i++) {
v = palette[i];
alpha = v >> 24;
- if (alpha && alpha != 0xff)
+ if (alpha != 0xff)
has_alpha = 1;
*alpha_ptr++ = alpha;
bytestream_put_be24(&ptr, v);
@@ -373,10 +376,6 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
if ((ff_png_pass_ymask[pass] << (y & 7)) & 0x80) {
ptr = p->data[0] + y * p->linesize[0];
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;
- }
png_get_interlaced_row(progressive_buf, pass_row_size,
bits_per_pixel, pass,
ptr, avctx->width);
@@ -391,11 +390,6 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
top = NULL;
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);
- 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);
png_write_row(s, crow, row_size + 1);
top = ptr;
@@ -427,7 +421,6 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
the_end:
av_free(crow_base);
av_free(progressive_buf);
- av_free(rgba_buf);
av_free(top_buf);
deflateEnd(&s->zstream);
return ret;
@@ -439,6 +432,23 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
static av_cold int png_enc_init(AVCodecContext *avctx){
PNGEncContext *s = avctx->priv_data;
+ switch(avctx->pix_fmt) {
+ case AV_PIX_FMT_RGBA:
+ avctx->bits_per_coded_sample = 32;
+ break;
+ case AV_PIX_FMT_RGB24:
+ avctx->bits_per_coded_sample = 24;
+ break;
+ case AV_PIX_FMT_GRAY8:
+ avctx->bits_per_coded_sample = 0x28;
+ break;
+ case AV_PIX_FMT_MONOBLACK:
+ avctx->bits_per_coded_sample = 1;
+ break;
+ case AV_PIX_FMT_PAL8:
+ avctx->bits_per_coded_sample = 8;
+ }
+
avctx->coded_frame = av_frame_alloc();
if (!avctx->coded_frame)
return AVERROR(ENOMEM);
@@ -452,6 +462,13 @@ static av_cold int png_enc_init(AVCodecContext *avctx){
if(avctx->pix_fmt == AV_PIX_FMT_MONOBLACK)
s->filter_type = PNG_FILTER_VALUE_NONE;
+ if (s->dpi && s->dpm) {
+ av_log(avctx, AV_LOG_ERROR, "Only one of 'dpi' or 'dpm' options should be set\n");
+ return AVERROR(EINVAL);
+ } else if (s->dpi) {
+ s->dpm = s->dpi * 10000 / 254;
+ }
+
return 0;
}
@@ -461,6 +478,21 @@ static av_cold int png_enc_close(AVCodecContext *avctx)
return 0;
}
+#define OFFSET(x) offsetof(PNGEncContext, x)
+#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+ {"dpi", "Set image resolution (in dots per inch)", OFFSET(dpi), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 0x10000, VE},
+ {"dpm", "Set image resolution (in dots per meter)", OFFSET(dpm), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 0x10000, VE},
+ { NULL }
+};
+
+static const AVClass pngenc_class = {
+ .class_name = "PNG encoder",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
AVCodec ff_png_encoder = {
.name = "png",
.long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
@@ -470,9 +502,14 @@ AVCodec ff_png_encoder = {
.init = png_enc_init,
.close = png_enc_close,
.encode2 = encode_frame,
+ .capabilities = CODEC_CAP_FRAME_THREADS | CODEC_CAP_INTRA_ONLY,
.pix_fmts = (const enum AVPixelFormat[]){
- AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB32, AV_PIX_FMT_PAL8, AV_PIX_FMT_GRAY8,
+ AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
+ AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGBA64BE,
+ AV_PIX_FMT_PAL8,
+ AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A,
AV_PIX_FMT_GRAY16BE,
AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE
},
+ .priv_class = &pngenc_class,
};
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