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FFmpeg/libavcodec/sunrastenc.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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,
.encode2 = 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,
};