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FFmpeg/libavcodec/pngenc.c
Andreas Rheinhardt 56e9e0273a avcodec/encode: Always use intermediate buffer in ff_alloc_packet2() 
Up until now, ff_alloc_packet2() has a min_size parameter:
It is supposed to be a lower bound on the final size of the packet
to allocate. If it is not too far from the upper bound (namely,
if it is at least half the upper bound), then ff_alloc_packet2()
already allocates the final, already refcounted packet; if it is
not, then the packet is not refcounted and its data only points to
a buffer owned by the AVCodecContext (in this case, the packet will
be made refcounted in encode_simple_internal() in libavcodec/encode.c).
The goal of this was to avoid data copies and intermediate buffers
if one has a precise lower bound.

Yet those encoders for which precise lower bounds exist have recently
been switched to ff_get_encode_buffer() (which automatically allocates
final buffers), leaving only two encoders to actually set the min_size
to something else than zero (namely aliaspixenc and hapenc). Both of
these encoders use a very low lower bound that is not helpful in any
nontrivial case.

This commit therefore removes the min_size parameter as well as the
codepath in ff_alloc_packet2() for the allocation of final buffers.
Furthermore, the function has been renamed to ff_alloc_packet() and
moved to encode.h alongside ff_get_encode_buffer().

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-06-08 12:52:50 +02:00

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/*
* PNG image format
* Copyright (c) 2003 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* 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.
*
* 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#include "encode.h"
#include "internal.h"
#include "bytestream.h"
#include "lossless_videoencdsp.h"
#include "png.h"
#include "apng.h"
#include "libavutil/avassert.h"
#include "libavutil/crc.h"
#include "libavutil/libm.h"
#include "libavutil/opt.h"
#include "libavutil/color_utils.h"
#include "libavutil/stereo3d.h"
#include <zlib.h>
#define IOBUF_SIZE 4096
typedef struct APNGFctlChunk {
uint32_t sequence_number;
uint32_t width, height;
uint32_t x_offset, y_offset;
uint16_t delay_num, delay_den;
uint8_t dispose_op, blend_op;
} APNGFctlChunk;
typedef struct PNGEncContext {
AVClass *class;
LLVidEncDSPContext llvidencdsp;
uint8_t *bytestream;
uint8_t *bytestream_start;
uint8_t *bytestream_end;
int filter_type;
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
int is_progressive;
int bit_depth;
int color_type;
int bits_per_pixel;
// APNG
uint32_t palette_checksum; // Used to ensure a single unique palette
uint32_t sequence_number;
int extra_data_updated;
uint8_t *extra_data;
int extra_data_size;
AVFrame *prev_frame;
AVFrame *last_frame;
APNGFctlChunk last_frame_fctl;
uint8_t *last_frame_packet;
size_t last_frame_packet_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;
static const int masks[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
mask = masks[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 sub_left_prediction(PNGEncContext *c, uint8_t *dst, const uint8_t *src, int bpp, int size)
{
const uint8_t *src1 = src + bpp;
const uint8_t *src2 = src;
int x, unaligned_w;
memcpy(dst, src, bpp);
dst += bpp;
size -= bpp;
unaligned_w = FFMIN(32 - bpp, size);
for (x = 0; x < unaligned_w; x++)
*dst++ = *src1++ - *src2++;
size -= unaligned_w;
c->llvidencdsp.diff_bytes(dst, src1, src2, size);
}
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:
sub_left_prediction(c, dst, src, bpp, size);
break;
case PNG_FILTER_VALUE_UP:
c->llvidencdsp.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;
av_assert0(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 png_write_chunk(uint8_t **f, uint32_t tag,
const uint8_t *buf, int length)
{
const AVCRC *crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
uint32_t crc = ~0U;
uint8_t tagbuf[4];
bytestream_put_be32(f, length);
AV_WL32(tagbuf, tag);
crc = av_crc(crc_table, crc, tagbuf, 4);
bytestream_put_be32(f, av_bswap32(tag));
if (length > 0) {
crc = av_crc(crc_table, crc, buf, length);
memcpy(*f, buf, length);
*f += length;
}
bytestream_put_be32(f, ~crc);
}
static void png_write_image_data(AVCodecContext *avctx,
const uint8_t *buf, int length)
{
PNGEncContext *s = avctx->priv_data;
const AVCRC *crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
uint32_t crc = ~0U;
if (avctx->codec_id == AV_CODEC_ID_PNG || avctx->frame_number == 0) {
png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), buf, length);
return;
}
bytestream_put_be32(&s->bytestream, length + 4);
bytestream_put_be32(&s->bytestream, MKBETAG('f', 'd', 'A', 'T'));
bytestream_put_be32(&s->bytestream, s->sequence_number);
crc = av_crc(crc_table, crc, s->bytestream - 8, 8);
crc = av_crc(crc_table, crc, buf, length);
memcpy(s->bytestream, buf, length);
s->bytestream += length;
bytestream_put_be32(&s->bytestream, ~crc);
++s->sequence_number;
}
/* XXX: do filtering */
static int png_write_row(AVCodecContext *avctx, const uint8_t *data, int size)
{
PNGEncContext *s = avctx->priv_data;
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_image_data(avctx, s->buf, IOBUF_SIZE);
s->zstream.avail_out = IOBUF_SIZE;
s->zstream.next_out = s->buf;
}
}
return 0;
}
#define AV_WB32_PNG(buf, n) AV_WB32(buf, lrint((n) * 100000))
static int png_get_chrm(enum AVColorPrimaries prim, uint8_t *buf)
{
double rx, ry, gx, gy, bx, by, wx = 0.3127, wy = 0.3290;
switch (prim) {
case AVCOL_PRI_BT709:
rx = 0.640; ry = 0.330;
gx = 0.300; gy = 0.600;
bx = 0.150; by = 0.060;
break;
case AVCOL_PRI_BT470M:
rx = 0.670; ry = 0.330;
gx = 0.210; gy = 0.710;
bx = 0.140; by = 0.080;
wx = 0.310; wy = 0.316;
break;
case AVCOL_PRI_BT470BG:
rx = 0.640; ry = 0.330;
gx = 0.290; gy = 0.600;
bx = 0.150; by = 0.060;
break;
case AVCOL_PRI_SMPTE170M:
case AVCOL_PRI_SMPTE240M:
rx = 0.630; ry = 0.340;
gx = 0.310; gy = 0.595;
bx = 0.155; by = 0.070;
break;
case AVCOL_PRI_BT2020:
rx = 0.708; ry = 0.292;
gx = 0.170; gy = 0.797;
bx = 0.131; by = 0.046;
break;
default:
return 0;
}
AV_WB32_PNG(buf , wx); AV_WB32_PNG(buf + 4 , wy);
AV_WB32_PNG(buf + 8 , rx); AV_WB32_PNG(buf + 12, ry);
AV_WB32_PNG(buf + 16, gx); AV_WB32_PNG(buf + 20, gy);
AV_WB32_PNG(buf + 24, bx); AV_WB32_PNG(buf + 28, by);
return 1;
}
static int png_get_gama(enum AVColorTransferCharacteristic trc, uint8_t *buf)
{
double gamma = avpriv_get_gamma_from_trc(trc);
if (gamma <= 1e-6)
return 0;
AV_WB32_PNG(buf, 1.0 / gamma);
return 1;
}
static int encode_headers(AVCodecContext *avctx, const AVFrame *pict)
{
AVFrameSideData *side_data;
PNGEncContext *s = avctx->priv_data;
/* write png header */
AV_WB32(s->buf, avctx->width);
AV_WB32(s->buf + 4, avctx->height);
s->buf[8] = s->bit_depth;
s->buf[9] = s->color_type;
s->buf[10] = 0; /* compression type */
s->buf[11] = 0; /* filter type */
s->buf[12] = s->is_progressive; /* interlace type */
png_write_chunk(&s->bytestream, MKTAG('I', 'H', 'D', 'R'), s->buf, 13);
/* write physical information */
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);
/* write stereoscopic information */
side_data = av_frame_get_side_data(pict, AV_FRAME_DATA_STEREO3D);
if (side_data) {
AVStereo3D *stereo3d = (AVStereo3D *)side_data->data;
switch (stereo3d->type) {
case AV_STEREO3D_SIDEBYSIDE:
s->buf[0] = ((stereo3d->flags & AV_STEREO3D_FLAG_INVERT) == 0) ? 1 : 0;
png_write_chunk(&s->bytestream, MKTAG('s', 'T', 'E', 'R'), s->buf, 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;
}
}
/* write colorspace information */
if (pict->color_primaries == AVCOL_PRI_BT709 &&
pict->color_trc == AVCOL_TRC_IEC61966_2_1) {
s->buf[0] = 1; /* rendering intent, relative colorimetric by default */
png_write_chunk(&s->bytestream, MKTAG('s', 'R', 'G', 'B'), s->buf, 1);
}
if (png_get_chrm(pict->color_primaries, s->buf))
png_write_chunk(&s->bytestream, MKTAG('c', 'H', 'R', 'M'), s->buf, 32);
if (png_get_gama(pict->color_trc, s->buf))
png_write_chunk(&s->bytestream, MKTAG('g', 'A', 'M', 'A'), s->buf, 4);
/* put the palette if needed */
if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
int has_alpha, alpha, i;
unsigned int v;
uint32_t *palette;
uint8_t *ptr, *alpha_ptr;
palette = (uint32_t *)pict->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 != 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);
}
}
return 0;
}
static int encode_frame(AVCodecContext *avctx, const AVFrame *pict)
{
PNGEncContext *s = avctx->priv_data;
const AVFrame *const p = pict;
int y, len, ret;
int row_size, pass_row_size;
uint8_t *ptr, *top, *crow_buf, *crow;
uint8_t *crow_base = NULL;
uint8_t *progressive_buf = NULL;
uint8_t *top_buf = NULL;
row_size = (pict->width * s->bits_per_pixel + 7) >> 3;
crow_base = av_malloc((row_size + 32) << (s->filter_type == PNG_FILTER_VALUE_MIXED));
if (!crow_base) {
ret = AVERROR(ENOMEM);
goto the_end;
}
// pixel data should be aligned, but there's a control byte before it
crow_buf = crow_base + 15;
if (s->is_progressive) {
progressive_buf = av_malloc(row_size + 1);
top_buf = av_malloc(row_size + 1);
if (!progressive_buf || !top_buf) {
ret = AVERROR(ENOMEM);
goto the_end;
}
}
/* put each row */
s->zstream.avail_out = IOBUF_SIZE;
s->zstream.next_out = s->buf;
if (s->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, s->bits_per_pixel, pict->width);
if (pass_row_size > 0) {
top = NULL;
for (y = 0; y < pict->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);
png_get_interlaced_row(progressive_buf, pass_row_size,
s->bits_per_pixel, pass,
ptr, pict->width);
crow = png_choose_filter(s, crow_buf, progressive_buf,
top, pass_row_size, s->bits_per_pixel >> 3);
png_write_row(avctx, crow, pass_row_size + 1);
top = progressive_buf;
}
}
}
} else {
top = NULL;
for (y = 0; y < pict->height; y++) {
ptr = p->data[0] + y * p->linesize[0];
crow = png_choose_filter(s, crow_buf, ptr, top,
row_size, s->bits_per_pixel >> 3);
png_write_row(avctx, 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_image_data(avctx, s->buf, len);
}
s->zstream.avail_out = IOBUF_SIZE;
s->zstream.next_out = s->buf;
if (ret == Z_STREAM_END)
break;
} else {
ret = -1;
goto the_end;
}
}
ret = 0;
the_end:
av_freep(&crow_base);
av_freep(&progressive_buf);
av_freep(&top_buf);
deflateReset(&s->zstream);
return ret;
}
static int encode_png(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{
PNGEncContext *s = avctx->priv_data;
int ret;
int enc_row_size;
size_t max_packet_size;
enc_row_size = deflateBound(&s->zstream, (avctx->width * s->bits_per_pixel + 7) >> 3);
max_packet_size =
AV_INPUT_BUFFER_MIN_SIZE + // headers
avctx->height * (
enc_row_size +
12 * (((int64_t)enc_row_size + IOBUF_SIZE - 1) / IOBUF_SIZE) // IDAT * ceil(enc_row_size / IOBUF_SIZE)
);
if (max_packet_size > INT_MAX)
return AVERROR(ENOMEM);
ret = ff_alloc_packet(avctx, pkt, max_packet_size);
if (ret < 0)
return ret;
s->bytestream_start =
s->bytestream = pkt->data;
s->bytestream_end = pkt->data + pkt->size;
AV_WB64(s->bytestream, PNGSIG);
s->bytestream += 8;
ret = encode_headers(avctx, pict);
if (ret < 0)
return ret;
ret = encode_frame(avctx, pict);
if (ret < 0)
return ret;
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;
return 0;
}
static int apng_do_inverse_blend(AVFrame *output, const AVFrame *input,
APNGFctlChunk *fctl_chunk, uint8_t bpp)
{
// output: background, input: foreground
// output the image such that when blended with the background, will produce the foreground
unsigned int x, y;
unsigned int leftmost_x = input->width;
unsigned int rightmost_x = 0;
unsigned int topmost_y = input->height;
unsigned int bottommost_y = 0;
const uint8_t *input_data = input->data[0];
uint8_t *output_data = output->data[0];
ptrdiff_t input_linesize = input->linesize[0];
ptrdiff_t output_linesize = output->linesize[0];
// Find bounding box of changes
for (y = 0; y < input->height; ++y) {
for (x = 0; x < input->width; ++x) {
if (!memcmp(input_data + bpp * x, output_data + bpp * x, bpp))
continue;
if (x < leftmost_x)
leftmost_x = x;
if (x >= rightmost_x)
rightmost_x = x + 1;
if (y < topmost_y)
topmost_y = y;
if (y >= bottommost_y)
bottommost_y = y + 1;
}
input_data += input_linesize;
output_data += output_linesize;
}
if (leftmost_x == input->width && rightmost_x == 0) {
// Empty frame
// APNG does not support empty frames, so we make it a 1x1 frame
leftmost_x = topmost_y = 0;
rightmost_x = bottommost_y = 1;
}
// Do actual inverse blending
if (fctl_chunk->blend_op == APNG_BLEND_OP_SOURCE) {
output_data = output->data[0];
for (y = topmost_y; y < bottommost_y; ++y) {
memcpy(output_data,
input->data[0] + input_linesize * y + bpp * leftmost_x,
bpp * (rightmost_x - leftmost_x));
output_data += output_linesize;
}
} else { // APNG_BLEND_OP_OVER
size_t transparent_palette_index;
uint32_t *palette;
switch (input->format) {
case AV_PIX_FMT_RGBA64BE:
case AV_PIX_FMT_YA16BE:
case AV_PIX_FMT_RGBA:
case AV_PIX_FMT_GRAY8A:
break;
case AV_PIX_FMT_PAL8:
palette = (uint32_t*)input->data[1];
for (transparent_palette_index = 0; transparent_palette_index < 256; ++transparent_palette_index)
if (palette[transparent_palette_index] >> 24 == 0)
break;
break;
default:
// No alpha, so blending not possible
return -1;
}
for (y = topmost_y; y < bottommost_y; ++y) {
uint8_t *foreground = input->data[0] + input_linesize * y + bpp * leftmost_x;
uint8_t *background = output->data[0] + output_linesize * y + bpp * leftmost_x;
output_data = output->data[0] + output_linesize * (y - topmost_y);
for (x = leftmost_x; x < rightmost_x; ++x, foreground += bpp, background += bpp, output_data += bpp) {
if (!memcmp(foreground, background, bpp)) {
if (input->format == AV_PIX_FMT_PAL8) {
if (transparent_palette_index == 256) {
// Need fully transparent colour, but none exists
return -1;
}
*output_data = transparent_palette_index;
} else {
memset(output_data, 0, bpp);
}
continue;
}
// Check for special alpha values, since full inverse
// alpha-on-alpha blending is rarely possible, and when
// possible, doesn't compress much better than
// APNG_BLEND_OP_SOURCE blending
switch (input->format) {
case AV_PIX_FMT_RGBA64BE:
if (((uint16_t*)foreground)[3] == 0xffff ||
((uint16_t*)background)[3] == 0)
break;
return -1;
case AV_PIX_FMT_YA16BE:
if (((uint16_t*)foreground)[1] == 0xffff ||
((uint16_t*)background)[1] == 0)
break;
return -1;
case AV_PIX_FMT_RGBA:
if (foreground[3] == 0xff || background[3] == 0)
break;
return -1;
case AV_PIX_FMT_GRAY8A:
if (foreground[1] == 0xff || background[1] == 0)
break;
return -1;
case AV_PIX_FMT_PAL8:
if (palette[*foreground] >> 24 == 0xff ||
palette[*background] >> 24 == 0)
break;
return -1;
}
memmove(output_data, foreground, bpp);
}
}
}
output->width = rightmost_x - leftmost_x;
output->height = bottommost_y - topmost_y;
fctl_chunk->width = output->width;
fctl_chunk->height = output->height;
fctl_chunk->x_offset = leftmost_x;
fctl_chunk->y_offset = topmost_y;
return 0;
}
static int apng_encode_frame(AVCodecContext *avctx, const AVFrame *pict,
APNGFctlChunk *best_fctl_chunk, APNGFctlChunk *best_last_fctl_chunk)
{
PNGEncContext *s = avctx->priv_data;
int ret;
unsigned int y;
AVFrame* diffFrame;
uint8_t bpp = (s->bits_per_pixel + 7) >> 3;
uint8_t *original_bytestream, *original_bytestream_end;
uint8_t *temp_bytestream = 0, *temp_bytestream_end;
uint32_t best_sequence_number;
uint8_t *best_bytestream;
size_t best_bytestream_size = SIZE_MAX;
APNGFctlChunk last_fctl_chunk = *best_last_fctl_chunk;
APNGFctlChunk fctl_chunk = *best_fctl_chunk;
if (avctx->frame_number == 0) {
best_fctl_chunk->width = pict->width;
best_fctl_chunk->height = pict->height;
best_fctl_chunk->x_offset = 0;
best_fctl_chunk->y_offset = 0;
best_fctl_chunk->blend_op = APNG_BLEND_OP_SOURCE;
return encode_frame(avctx, pict);
}
diffFrame = av_frame_alloc();
if (!diffFrame)
return AVERROR(ENOMEM);
diffFrame->format = pict->format;
diffFrame->width = pict->width;
diffFrame->height = pict->height;
if ((ret = av_frame_get_buffer(diffFrame, 0)) < 0)
goto fail;
original_bytestream = s->bytestream;
original_bytestream_end = s->bytestream_end;
temp_bytestream = av_malloc(original_bytestream_end - original_bytestream);
if (!temp_bytestream) {
ret = AVERROR(ENOMEM);
goto fail;
}
temp_bytestream_end = temp_bytestream + (original_bytestream_end - original_bytestream);
for (last_fctl_chunk.dispose_op = 0; last_fctl_chunk.dispose_op < 3; ++last_fctl_chunk.dispose_op) {
// 0: APNG_DISPOSE_OP_NONE
// 1: APNG_DISPOSE_OP_BACKGROUND
// 2: APNG_DISPOSE_OP_PREVIOUS
for (fctl_chunk.blend_op = 0; fctl_chunk.blend_op < 2; ++fctl_chunk.blend_op) {
// 0: APNG_BLEND_OP_SOURCE
// 1: APNG_BLEND_OP_OVER
uint32_t original_sequence_number = s->sequence_number, sequence_number;
uint8_t *bytestream_start = s->bytestream;
size_t bytestream_size;
// Do disposal
if (last_fctl_chunk.dispose_op != APNG_DISPOSE_OP_PREVIOUS) {
diffFrame->width = pict->width;
diffFrame->height = pict->height;
ret = av_frame_copy(diffFrame, s->last_frame);
if (ret < 0)
goto fail;
if (last_fctl_chunk.dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
for (y = last_fctl_chunk.y_offset; y < last_fctl_chunk.y_offset + last_fctl_chunk.height; ++y) {
size_t row_start = diffFrame->linesize[0] * y + bpp * last_fctl_chunk.x_offset;
memset(diffFrame->data[0] + row_start, 0, bpp * last_fctl_chunk.width);
}
}
} else {
if (!s->prev_frame)
continue;
diffFrame->width = pict->width;
diffFrame->height = pict->height;
ret = av_frame_copy(diffFrame, s->prev_frame);
if (ret < 0)
goto fail;
}
// Do inverse blending
if (apng_do_inverse_blend(diffFrame, pict, &fctl_chunk, bpp) < 0)
continue;
// Do encoding
ret = encode_frame(avctx, diffFrame);
sequence_number = s->sequence_number;
s->sequence_number = original_sequence_number;
bytestream_size = s->bytestream - bytestream_start;
s->bytestream = bytestream_start;
if (ret < 0)
goto fail;
if (bytestream_size < best_bytestream_size) {
*best_fctl_chunk = fctl_chunk;
*best_last_fctl_chunk = last_fctl_chunk;
best_sequence_number = sequence_number;
best_bytestream = s->bytestream;
best_bytestream_size = bytestream_size;
if (best_bytestream == original_bytestream) {
s->bytestream = temp_bytestream;
s->bytestream_end = temp_bytestream_end;
} else {
s->bytestream = original_bytestream;
s->bytestream_end = original_bytestream_end;
}
}
}
}
s->sequence_number = best_sequence_number;
s->bytestream = original_bytestream + best_bytestream_size;
s->bytestream_end = original_bytestream_end;
if (best_bytestream != original_bytestream)
memcpy(original_bytestream, best_bytestream, best_bytestream_size);
ret = 0;
fail:
av_freep(&temp_bytestream);
av_frame_free(&diffFrame);
return ret;
}
static int encode_apng(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{
PNGEncContext *s = avctx->priv_data;
int ret;
int enc_row_size;
size_t max_packet_size;
APNGFctlChunk fctl_chunk = {0};
if (pict && s->color_type == PNG_COLOR_TYPE_PALETTE) {
uint32_t checksum = ~av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), ~0U, pict->data[1], 256 * sizeof(uint32_t));
if (avctx->frame_number == 0) {
s->palette_checksum = checksum;
} else if (checksum != s->palette_checksum) {
av_log(avctx, AV_LOG_ERROR,
"Input contains more than one unique palette. APNG does not support multiple palettes.\n");
return -1;
}
}
enc_row_size = deflateBound(&s->zstream, (avctx->width * s->bits_per_pixel + 7) >> 3);
max_packet_size =
AV_INPUT_BUFFER_MIN_SIZE + // headers
avctx->height * (
enc_row_size +
(4 + 12) * (((int64_t)enc_row_size + IOBUF_SIZE - 1) / IOBUF_SIZE) // fdAT * ceil(enc_row_size / IOBUF_SIZE)
);
if (max_packet_size > INT_MAX)
return AVERROR(ENOMEM);
if (avctx->frame_number == 0) {
if (!pict)
return AVERROR(EINVAL);
s->bytestream = s->extra_data = av_malloc(AV_INPUT_BUFFER_MIN_SIZE);
if (!s->extra_data)
return AVERROR(ENOMEM);
ret = encode_headers(avctx, pict);
if (ret < 0)
return ret;
s->extra_data_size = s->bytestream - s->extra_data;
s->last_frame_packet = av_malloc(max_packet_size);
if (!s->last_frame_packet)
return AVERROR(ENOMEM);
} else if (s->last_frame) {
ret = ff_get_encode_buffer(avctx, pkt, s->last_frame_packet_size, 0);
if (ret < 0)
return ret;
memcpy(pkt->data, s->last_frame_packet, s->last_frame_packet_size);
pkt->pts = pkt->dts = s->last_frame->pts;
}
if (pict) {
s->bytestream_start =
s->bytestream = s->last_frame_packet;
s->bytestream_end = s->bytestream + max_packet_size;
// We're encoding the frame first, so we have to do a bit of shuffling around
// to have the image data write to the correct place in the buffer
fctl_chunk.sequence_number = s->sequence_number;
++s->sequence_number;
s->bytestream += 26 + 12;
ret = apng_encode_frame(avctx, pict, &fctl_chunk, &s->last_frame_fctl);
if (ret < 0)
return ret;
fctl_chunk.delay_num = 0; // delay filled in during muxing
fctl_chunk.delay_den = 0;
} else {
s->last_frame_fctl.dispose_op = APNG_DISPOSE_OP_NONE;
}
if (s->last_frame) {
uint8_t* last_fctl_chunk_start = pkt->data;
uint8_t buf[26];
if (!s->extra_data_updated) {
uint8_t *side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, s->extra_data_size);
if (!side_data)
return AVERROR(ENOMEM);
memcpy(side_data, s->extra_data, s->extra_data_size);
s->extra_data_updated = 1;
}
AV_WB32(buf + 0, s->last_frame_fctl.sequence_number);
AV_WB32(buf + 4, s->last_frame_fctl.width);
AV_WB32(buf + 8, s->last_frame_fctl.height);
AV_WB32(buf + 12, s->last_frame_fctl.x_offset);
AV_WB32(buf + 16, s->last_frame_fctl.y_offset);
AV_WB16(buf + 20, s->last_frame_fctl.delay_num);
AV_WB16(buf + 22, s->last_frame_fctl.delay_den);
buf[24] = s->last_frame_fctl.dispose_op;
buf[25] = s->last_frame_fctl.blend_op;
png_write_chunk(&last_fctl_chunk_start, MKTAG('f', 'c', 'T', 'L'), buf, 26);
*got_packet = 1;
}
if (pict) {
if (!s->last_frame) {
s->last_frame = av_frame_alloc();
if (!s->last_frame)
return AVERROR(ENOMEM);
} else if (s->last_frame_fctl.dispose_op != APNG_DISPOSE_OP_PREVIOUS) {
if (!s->prev_frame) {
s->prev_frame = av_frame_alloc();
if (!s->prev_frame)
return AVERROR(ENOMEM);
s->prev_frame->format = pict->format;
s->prev_frame->width = pict->width;
s->prev_frame->height = pict->height;
if ((ret = av_frame_get_buffer(s->prev_frame, 0)) < 0)
return ret;
}
// Do disposal, but not blending
av_frame_copy(s->prev_frame, s->last_frame);
if (s->last_frame_fctl.dispose_op == APNG_DISPOSE_OP_BACKGROUND) {
uint32_t y;
uint8_t bpp = (s->bits_per_pixel + 7) >> 3;
for (y = s->last_frame_fctl.y_offset; y < s->last_frame_fctl.y_offset + s->last_frame_fctl.height; ++y) {
size_t row_start = s->prev_frame->linesize[0] * y + bpp * s->last_frame_fctl.x_offset;
memset(s->prev_frame->data[0] + row_start, 0, bpp * s->last_frame_fctl.width);
}
}
}
av_frame_unref(s->last_frame);
ret = av_frame_ref(s->last_frame, (AVFrame*)pict);
if (ret < 0)
return ret;
s->last_frame_fctl = fctl_chunk;
s->last_frame_packet_size = s->bytestream - s->bytestream_start;
} else {
av_frame_free(&s->last_frame);
}
return 0;
}
static av_cold int png_enc_init(AVCodecContext *avctx)
{
PNGEncContext *s = avctx->priv_data;
int compression_level;
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;
}
ff_llvidencdsp_init(&s->llvidencdsp);
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;
}
s->is_progressive = !!(avctx->flags & AV_CODEC_FLAG_INTERLACED_DCT);
switch (avctx->pix_fmt) {
case AV_PIX_FMT_RGBA64BE:
s->bit_depth = 16;
s->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
break;
case AV_PIX_FMT_RGB48BE:
s->bit_depth = 16;
s->color_type = PNG_COLOR_TYPE_RGB;
break;
case AV_PIX_FMT_RGBA:
s->bit_depth = 8;
s->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
break;
case AV_PIX_FMT_RGB24:
s->bit_depth = 8;
s->color_type = PNG_COLOR_TYPE_RGB;
break;
case AV_PIX_FMT_GRAY16BE:
s->bit_depth = 16;
s->color_type = PNG_COLOR_TYPE_GRAY;
break;
case AV_PIX_FMT_GRAY8:
s->bit_depth = 8;
s->color_type = PNG_COLOR_TYPE_GRAY;
break;
case AV_PIX_FMT_GRAY8A:
s->bit_depth = 8;
s->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
break;
case AV_PIX_FMT_YA16BE:
s->bit_depth = 16;
s->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
break;
case AV_PIX_FMT_MONOBLACK:
s->bit_depth = 1;
s->color_type = PNG_COLOR_TYPE_GRAY;
break;
case AV_PIX_FMT_PAL8:
s->bit_depth = 8;
s->color_type = PNG_COLOR_TYPE_PALETTE;
break;
default:
return -1;
}
s->bits_per_pixel = ff_png_get_nb_channels(s->color_type) * s->bit_depth;
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);
if (deflateInit2(&s->zstream, compression_level, Z_DEFLATED, 15, 8, Z_DEFAULT_STRATEGY) != Z_OK)
return -1;
return 0;
}
static av_cold int png_enc_close(AVCodecContext *avctx)
{
PNGEncContext *s = avctx->priv_data;
deflateEnd(&s->zstream);
av_frame_free(&s->last_frame);
av_frame_free(&s->prev_frame);
av_freep(&s->last_frame_packet);
av_freep(&s->extra_data);
s->extra_data_size = 0;
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},
{ "pred", "Prediction method", OFFSET(filter_type), AV_OPT_TYPE_INT, { .i64 = PNG_FILTER_VALUE_NONE }, PNG_FILTER_VALUE_NONE, PNG_FILTER_VALUE_MIXED, VE, "pred" },
{ "none", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_NONE }, INT_MIN, INT_MAX, VE, "pred" },
{ "sub", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_SUB }, INT_MIN, INT_MAX, VE, "pred" },
{ "up", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_UP }, INT_MIN, INT_MAX, VE, "pred" },
{ "avg", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_AVG }, INT_MIN, INT_MAX, VE, "pred" },
{ "paeth", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_PAETH }, INT_MIN, INT_MAX, VE, "pred" },
{ "mixed", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PNG_FILTER_VALUE_MIXED }, INT_MIN, INT_MAX, VE, "pred" },
{ NULL},
};
static const AVClass pngenc_class = {
.class_name = "PNG encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVClass apngenc_class = {
.class_name = "APNG encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const 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,
.close = png_enc_close,
.encode2 = encode_png,
.capabilities = AV_CODEC_CAP_FRAME_THREADS,
.pix_fmts = (const enum AVPixelFormat[]) {
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_YA16BE,
AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE
},
.priv_class = &pngenc_class,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
const AVCodec ff_apng_encoder = {
.name = "apng",
.long_name = NULL_IF_CONFIG_SMALL("APNG (Animated Portable Network Graphics) image"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_APNG,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
.priv_data_size = sizeof(PNGEncContext),
.init = png_enc_init,
.close = png_enc_close,
.encode2 = encode_apng,
.pix_fmts = (const enum AVPixelFormat[]) {
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_YA16BE,
AV_PIX_FMT_NONE
},
.priv_class = &apngenc_class,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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