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FFmpeg/libavcodec/sunrastenc.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

227 lines
7.0 KiB
C

/*
* Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image encoder
* Copyright (c) 2012 Aneesh Dogra (lionaneesh) <lionaneesh@gmail.com>
*
* 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 "libavutil/opt.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "encode.h"
#include "sunrast.h"
typedef struct SUNRASTContext {
AVClass *class;
PutByteContext p;
int depth; ///< depth of pixel
int length; ///< length (bytes) of image
int type; ///< type of file
int maptype; ///< type of colormap
int maplength; ///< length (bytes) of colormap
int size;
} SUNRASTContext;
static void sunrast_image_write_header(AVCodecContext *avctx)
{
SUNRASTContext *s = avctx->priv_data;
bytestream2_put_be32u(&s->p, RAS_MAGIC);
bytestream2_put_be32u(&s->p, avctx->width);
bytestream2_put_be32u(&s->p, avctx->height);
bytestream2_put_be32u(&s->p, s->depth);
bytestream2_put_be32u(&s->p, s->length);
bytestream2_put_be32u(&s->p, s->type);
bytestream2_put_be32u(&s->p, s->maptype);
bytestream2_put_be32u(&s->p, s->maplength);
}
static void sunrast_image_write_image(AVCodecContext *avctx,
const uint8_t *pixels,
const uint32_t *palette_data,
int linesize)
{
SUNRASTContext *s = avctx->priv_data;
const uint8_t *ptr;
int len, alen, x, y;
if (s->maplength) { // palettized
PutByteContext pb_r, pb_g;
int len = s->maplength / 3;
pb_r = s->p;
bytestream2_skip_p(&s->p, len);
pb_g = s->p;
bytestream2_skip_p(&s->p, len);
for (x = 0; x < len; x++) {
uint32_t pixel = palette_data[x];
bytestream2_put_byteu(&pb_r, (pixel >> 16) & 0xFF);
bytestream2_put_byteu(&pb_g, (pixel >> 8) & 0xFF);
bytestream2_put_byteu(&s->p, pixel & 0xFF);
}
}
len = (s->depth * avctx->width + 7) >> 3;
alen = len + (len & 1);
ptr = pixels;
if (s->type == RT_BYTE_ENCODED) {
uint8_t value, value2;
int run;
ptr = pixels;
#define GET_VALUE y >= avctx->height ? 0 : x >= len ? ptr[len-1] : ptr[x]
x = 0, y = 0;
value2 = GET_VALUE;
while (y < avctx->height) {
run = 1;
value = value2;
x++;
if (x >= alen) {
x = 0;
ptr += linesize, y++;
}
value2 = GET_VALUE;
while (value2 == value && run < 256 && y < avctx->height) {
x++;
run++;
if (x >= alen) {
x = 0;
ptr += linesize, y++;
}
value2 = GET_VALUE;
}
if (run > 2 || value == RLE_TRIGGER) {
bytestream2_put_byteu(&s->p, RLE_TRIGGER);
bytestream2_put_byteu(&s->p, run - 1);
if (run > 1)
bytestream2_put_byteu(&s->p, value);
} else if (run == 1) {
bytestream2_put_byteu(&s->p, value);
} else
bytestream2_put_be16u(&s->p, (value << 8) | value);
}
// update data length for header
s->length = bytestream2_tell_p(&s->p) - 32 - s->maplength;
} else {
for (y = 0; y < avctx->height; y++) {
bytestream2_put_buffer(&s->p, ptr, len);
if (len < alen)
bytestream2_put_byteu(&s->p, 0);
ptr += linesize;
}
}
}
static av_cold int sunrast_encode_init(AVCodecContext *avctx)
{
SUNRASTContext *s = avctx->priv_data;
// adjust boolean option to RT equivalent
s->type++;
s->maptype = RMT_NONE;
s->maplength = 0;
switch (avctx->pix_fmt) {
case AV_PIX_FMT_MONOWHITE:
s->depth = 1;
break;
case AV_PIX_FMT_PAL8 :
s->maptype = RMT_EQUAL_RGB;
s->maplength = 3 * 256;
/* fall-through */
case AV_PIX_FMT_GRAY8:
s->depth = 8;
break;
case AV_PIX_FMT_BGR24:
s->depth = 24;
break;
default:
return AVERROR_BUG;
}
s->length = avctx->height * (FFALIGN(avctx->width * s->depth, 16) >> 3);
s->size = 32 + s->maplength + s->length * s->type;
return 0;
}
static int sunrast_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
SUNRASTContext *s = avctx->priv_data;
int ret;
if ((ret = ff_alloc_packet(avctx, avpkt, s->size)) < 0)
return ret;
bytestream2_init_writer(&s->p, avpkt->data, avpkt->size);
sunrast_image_write_header(avctx);
sunrast_image_write_image(avctx, frame->data[0],
(const uint32_t *)frame->data[1],
frame->linesize[0]);
// update data length in header after RLE
if (s->type == RT_BYTE_ENCODED)
AV_WB32(&avpkt->data[16], s->length);
*got_packet_ptr = 1;
avpkt->size = bytestream2_tell_p(&s->p);
return 0;
}
#define OFFSET(x) offsetof(SUNRASTContext, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "rle", "Use run-length compression", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
{ NULL },
};
static const AVClass sunrast_class = {
.class_name = "sunrast",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFCodec ff_sunrast_encoder = {
.p.name = "sunrast",
.p.long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_SUNRAST,
.priv_data_size = sizeof(SUNRASTContext),
.init = sunrast_encode_init,
FF_CODEC_ENCODE_CB(sunrast_encode_frame),
.p.priv_class = &sunrast_class,
.p.pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24,
AV_PIX_FMT_PAL8,
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_MONOWHITE,
AV_PIX_FMT_NONE },
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};