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ffmpeg/libavcodec/pngenc.c

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/*
* PNG image format
* Copyright (c) 2003 Fabrice Bellard
*
* This file is part of Libav.
*
* 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.
*
* 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/stereo3d.h"
#include "avcodec.h"
#include "bytestream.h"
#include "huffyuvencdsp.h"
#include "png.h"
/* TODO:
* - add 2, 4 and 16 bit depth support
*/
#include <zlib.h>
#define IOBUF_SIZE 4096
typedef struct PNGEncContext {
HuffYUVEncDSPContext hdsp;
uint8_t *bytestream;
uint8_t *bytestream_start;
uint8_t *bytestream_end;
int filter_type;
z_stream zstream;
uint8_t buf[IOBUF_SIZE];
} PNGEncContext;
static void png_get_interlaced_row(uint8_t *dst, int row_size,
int bits_per_pixel, int pass,
const uint8_t *src, int width)
{
int x, mask, dst_x, j, b, bpp;
uint8_t *d;
const uint8_t *s;
mask = ff_png_pass_mask[pass];
switch (bits_per_pixel) {
case 1:
memset(dst, 0, row_size);
dst_x = 0;
for (x = 0; x < width; x++) {
j = (x & 7);
if ((mask << j) & 0x80) {
b = (src[x >> 3] >> (7 - j)) & 1;
dst[dst_x >> 3] |= b << (7 - (dst_x & 7));
dst_x++;
}
}
break;
default:
bpp = bits_per_pixel >> 3;
d = dst;
s = src;
for (x = 0; x < width; x++) {
j = x & 7;
if ((mask << j) & 0x80) {
memcpy(d, s, bpp);
d += bpp;
}
s += bpp;
}
break;
}
}
static void sub_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 = src[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] = src[i] - p;
}
}
static void png_filter_row(PNGEncContext *c, uint8_t *dst, int filter_type,
uint8_t *src, uint8_t *top, int size, int bpp)
{
int i;
switch (filter_type) {
case PNG_FILTER_VALUE_NONE:
memcpy(dst, src, size);
break;
case PNG_FILTER_VALUE_SUB:
c->hdsp.diff_bytes(dst, src, src - bpp, size);
memcpy(dst, src, bpp);
break;
case PNG_FILTER_VALUE_UP:
c->hdsp.diff_bytes(dst, src, top, size);
break;
case PNG_FILTER_VALUE_AVG:
for (i = 0; i < bpp; i++)
dst[i] = src[i] - (top[i] >> 1);
for (; i < size; i++)
dst[i] = src[i] - ((src[i - bpp] + top[i]) >> 1);
break;
case PNG_FILTER_VALUE_PAETH:
for (i = 0; i < bpp; i++)
dst[i] = src[i] - top[i];
sub_png_paeth_prediction(dst + i, src + i, top + i, size - i, bpp);
break;
}
}
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);
if (!top && pred)
pred = PNG_FILTER_VALUE_SUB;
if (pred == PNG_FILTER_VALUE_MIXED) {
int i;
int cost, bcost = INT_MAX;
uint8_t *buf1 = dst, *buf2 = dst + size + 16;
for (pred = 0; pred < 5; pred++) {
png_filter_row(s, buf1 + 1, pred, src, top, size, bpp);
buf1[0] = pred;
cost = 0;
for (i = 0; i <= size; i++)
cost += abs((int8_t) buf1[i]);
if (cost < bcost) {
bcost = cost;
FFSWAP(uint8_t *, buf1, buf2);
}
}
return buf2;
} else {
png_filter_row(s, dst + 1, pred, src, top, size, bpp);
dst[0] = pred;
return 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)
{
uint32_t crc;
uint8_t tagbuf[4];
bytestream_put_be32(f, length);
crc = crc32(0, Z_NULL, 0);
AV_WL32(tagbuf, tag);
crc = crc32(crc, tagbuf, 4);
bytestream_put_be32(f, av_bswap32(tag));
if (length > 0) {
crc = crc32(crc, buf, length);
memcpy(*f, buf, length);
*f += length;
}
bytestream_put_be32(f, crc);
}
/* XXX: do filtering */
static int png_write_row(PNGEncContext *s, const uint8_t *data, int size)
{
int ret;
s->zstream.avail_in = size;
s->zstream.next_in = data;
while (s->zstream.avail_in > 0) {
ret = deflate(&s->zstream, Z_NO_FLUSH);
if (ret != Z_OK)
return -1;
if (s->zstream.avail_out == 0) {
if (s->bytestream_end - s->bytestream > IOBUF_SIZE + 100)
png_write_chunk(&s->bytestream,
MKTAG('I', 'D', 'A', 'T'), s->buf, IOBUF_SIZE);
s->zstream.avail_out = IOBUF_SIZE;
s->zstream.next_out = s->buf;
}
}
return 0;
}
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{
PNGEncContext *s = avctx->priv_data;
AVFrameSideData *side_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 compression_level;
uint8_t *ptr, *top, *crow_buf, *crow;
uint8_t *crow_base = NULL;
uint8_t *progressive_buf = NULL;
uint8_t *rgba_buf = NULL;
uint8_t *top_buf = NULL;
is_progressive = !!(avctx->flags & AV_CODEC_FLAG_INTERLACED_DCT);
switch (avctx->pix_fmt) {
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_RGB32:
bit_depth = 8;
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
break;
case AV_PIX_FMT_RGB24:
bit_depth = 8;
color_type = PNG_COLOR_TYPE_RGB;
break;
case AV_PIX_FMT_GRAY16BE:
bit_depth = 16;
color_type = PNG_COLOR_TYPE_GRAY;
break;
case AV_PIX_FMT_GRAY8:
bit_depth = 8;
color_type = PNG_COLOR_TYPE_GRAY;
break;
case AV_PIX_FMT_MONOBLACK:
bit_depth = 1;
color_type = PNG_COLOR_TYPE_GRAY;
break;
case AV_PIX_FMT_PAL8:
bit_depth = 8;
color_type = PNG_COLOR_TYPE_PALETTE;
break;
default:
return -1;
}
bits_per_pixel = ff_png_get_nb_channels(color_type) * bit_depth;
row_size = (avctx->width * bits_per_pixel + 7) >> 3;
s->zstream.zalloc = ff_png_zalloc;
s->zstream.zfree = ff_png_zfree;
s->zstream.opaque = NULL;
compression_level = avctx->compression_level == FF_COMPRESSION_DEFAULT
? Z_DEFAULT_COMPRESSION
: av_clip(avctx->compression_level, 0, 9);
ret = deflateInit2(&s->zstream, compression_level,
Z_DEFLATED, 15, 8, Z_DEFAULT_STRATEGY);
if (ret != Z_OK)
return -1;
enc_row_size = deflateBound(&s->zstream, row_size);
max_packet_size = avctx->height * (enc_row_size +
((enc_row_size + IOBUF_SIZE - 1) / IOBUF_SIZE) * 12)
+ AV_INPUT_BUFFER_MIN_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);
return ret;
}
s->bytestream_start =
s->bytestream = pkt->data;
s->bytestream_end = pkt->data + pkt->size;
crow_base = av_malloc((row_size + 32) << (s->filter_type == PNG_FILTER_VALUE_MIXED));
if (!crow_base)
goto fail;
// pixel data should be aligned, but there's a control byte before it
crow_buf = crow_base + 15;
if (is_progressive) {
progressive_buf = av_malloc(row_size + 1);
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) {
top_buf = av_malloc(row_size + 1);
if (!top_buf)
goto fail;
}
/* write png header */
memcpy(s->bytestream, ff_pngsig, 8);
s->bytestream += 8;
AV_WB32(s->buf, avctx->width);
AV_WB32(s->buf + 4, avctx->height);
s->buf[8] = bit_depth;
s->buf[9] = color_type;
s->buf[10] = 0; /* compression type */
s->buf[11] = 0; /* filter type */
s->buf[12] = is_progressive; /* interlace type */
png_write_chunk(&s->bytestream, MKTAG('I', 'H', 'D', 'R'), s->buf, 13);
/* put the palette if needed */
if (color_type == PNG_COLOR_TYPE_PALETTE) {
int has_alpha, alpha, i;
unsigned int v;
uint32_t *palette;
uint8_t *alpha_ptr;
palette = (uint32_t *)p->data[1];
ptr = s->buf;
alpha_ptr = s->buf + 256 * 3;
has_alpha = 0;
for (i = 0; i < 256; i++) {
v = palette[i];
alpha = v >> 24;
if (alpha && alpha != 0xff)
has_alpha = 1;
*alpha_ptr++ = alpha;
bytestream_put_be24(&ptr, v);
}
png_write_chunk(&s->bytestream,
MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3);
if (has_alpha) {
png_write_chunk(&s->bytestream,
MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256);
}
}
/* write stereoscopic information */
side_data = av_frame_get_side_data(pict, AV_FRAME_DATA_STEREO3D);
if (side_data) {
AVStereo3D *stereo3d = (AVStereo3D *)side_data->data;
uint8_t sm;
switch (stereo3d->type) {
case AV_STEREO3D_SIDEBYSIDE:
sm = !(stereo3d->flags & AV_STEREO3D_FLAG_INVERT);
png_write_chunk(&s->bytestream, MKTAG('s', 'T', 'E', 'R'), &sm, 1);
break;
case AV_STEREO3D_2D:
break;
default:
av_log(avctx, AV_LOG_WARNING,
"Only side-by-side stereo3d flag can be defined within sTER chunk\n");
break;
}
}
/* now put each row */
s->zstream.avail_out = IOBUF_SIZE;
s->zstream.next_out = s->buf;
if (is_progressive) {
int pass;
for (pass = 0; pass < NB_PASSES; pass++) {
/* NOTE: a pass is completely omitted if no pixels would be
* output */
pass_row_size = ff_png_pass_row_size(pass, bits_per_pixel, avctx->width);
if (pass_row_size > 0) {
top = NULL;
for (y = 0; y < avctx->height; y++)
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);
crow = png_choose_filter(s, crow_buf, progressive_buf,
top, pass_row_size, bits_per_pixel >> 3);
png_write_row(s, crow, pass_row_size + 1);
top = progressive_buf;
}
}
}
} else {
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;
}
}
/* compress last bytes */
for (;;) {
ret = deflate(&s->zstream, Z_FINISH);
if (ret == Z_OK || ret == Z_STREAM_END) {
len = IOBUF_SIZE - s->zstream.avail_out;
if (len > 0 && s->bytestream_end - s->bytestream > len + 100) {
png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, len);
}
s->zstream.avail_out = IOBUF_SIZE;
s->zstream.next_out = s->buf;
if (ret == Z_STREAM_END)
break;
} else {
goto fail;
}
}
png_write_chunk(&s->bytestream, MKTAG('I', 'E', 'N', 'D'), NULL, 0);
pkt->size = s->bytestream - s->bytestream_start;
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
ret = 0;
the_end:
av_free(crow_base);
av_free(progressive_buf);
av_free(rgba_buf);
av_free(top_buf);
deflateEnd(&s->zstream);
return ret;
fail:
ret = -1;
goto the_end;
}
static av_cold int png_enc_init(AVCodecContext *avctx)
{
PNGEncContext *s = avctx->priv_data;
#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
avctx->coded_frame->key_frame = 1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
ff_huffyuvencdsp_init(&s->hdsp);
s->filter_type = av_clip(avctx->prediction_method,
PNG_FILTER_VALUE_NONE,
PNG_FILTER_VALUE_MIXED);
if (avctx->pix_fmt == AV_PIX_FMT_MONOBLACK)
s->filter_type = PNG_FILTER_VALUE_NONE;
return 0;
}
AVCodec ff_png_encoder = {
.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(PNGEncContext),
.init = png_enc_init,
.encode2 = encode_frame,
.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB32, AV_PIX_FMT_PAL8, AV_PIX_FMT_GRAY8,
AV_PIX_FMT_RGBA64BE, AV_PIX_FMT_RGB48BE, AV_PIX_FMT_GRAY16BE,
AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE
},
};
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