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/*
* 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 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 "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "sunrast.h"
typedef struct SUNRASTContext {
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;
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;
const uint8_t *start = linesize < 0 ? pixels + (avctx->height - 1) * linesize
: pixels;
const uint8_t *end = linesize < 0 ? pixels - linesize
: pixels + avctx->height * linesize;
ptr = pixels;
#define GET_VALUE ptr >= end || ptr < start ? 0 : x >= len ? ptr[len-1] : ptr[x]
x = 0;
value2 = GET_VALUE;
while (ptr < end && ptr >= start) {
run = 1;
value = value2;
x++;
if (x >= alen) {
x = 0;
ptr += linesize;
}
value2 = GET_VALUE;
while (value2 == value && run < 256 && ptr < end && ptr >= start) {
x++;
run++;
if (x >= alen) {
x = 0;
ptr += linesize;
}
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 {
int y;
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;
switch (avctx->coder_type) {
case FF_CODER_TYPE_RLE:
s->type = RT_BYTE_ENCODED;
break;
case FF_CODER_TYPE_RAW:
s->type = RT_STANDARD;
break;
default:
av_log(avctx, AV_LOG_ERROR, "invalid coder_type\n");
return AVERROR(EINVAL);
}
avctx->coded_frame->key_frame = 1;
avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
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 == RT_BYTE_ENCODED ? 2 : 1);
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(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->flags |= AV_PKT_FLAG_KEY;
avpkt->size = bytestream2_tell_p(&s->p);
return 0;
}
static const AVCodecDefault sunrast_defaults[] = {
{ "coder", "rle" },
{ NULL },
};
AVCodec ff_sunrast_encoder = {
.name = "sunrast",
.long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_SUNRAST,
.priv_data_size = sizeof(SUNRASTContext),
.init = sunrast_encode_init,
.encode2 = sunrast_encode_frame,
.defaults = sunrast_defaults,
.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 },
};
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