152 lines
4.3 KiB
C
152 lines
4.3 KiB
C
/*
|
|
* SGI RLE 8-bit decoder
|
|
* Copyright (c) 2012 Peter Ross
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* SGI RLE 8-bit decoder
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
|
|
typedef struct SGIRLEContext {
|
|
AVFrame *frame;
|
|
} SGIRLEContext;
|
|
|
|
static av_cold int sgirle_decode_init(AVCodecContext *avctx)
|
|
{
|
|
SGIRLEContext *s = avctx->priv_data;
|
|
avctx->pix_fmt = AV_PIX_FMT_BGR8;
|
|
s->frame = av_frame_alloc();
|
|
if (!s->frame)
|
|
return AVERROR(ENOMEM);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Convert SGI RGB332 pixel into AV_PIX_FMT_BGR8
|
|
* SGI RGB332 is packed RGB 3:3:2, 8bpp, (msb)3R 2B 3G(lsb)
|
|
*/
|
|
#define RGB332_TO_BGR8(x) (((x << 3) & 0xC0) | ((x << 3) & 0x38) | ((x >> 5) & 7))
|
|
|
|
static av_always_inline void memcpy_rgb332_to_bgr8(uint8_t *dst, const uint8_t *src, int size)
|
|
{
|
|
int i;
|
|
for (i = 0; i < size; i++)
|
|
dst[i] = RGB332_TO_BGR8(src[i]);
|
|
}
|
|
|
|
/**
|
|
* @param[out] dst Destination buffer
|
|
* @param[in] src Source buffer
|
|
* @param src_size Source buffer size (bytes)
|
|
* @param width Width of destination buffer (pixels)
|
|
* @param height Height of destination buffer (pixels)
|
|
* @param linesize Line size of destination buffer (bytes)
|
|
* @return <0 on error
|
|
*/
|
|
static int decode_sgirle8(AVCodecContext *avctx, uint8_t *dst, const uint8_t *src, int src_size, int width, int height, int linesize)
|
|
{
|
|
const uint8_t *src_end = src + src_size;
|
|
int x = 0, y = 0;
|
|
|
|
#define INC_XY(n) \
|
|
x += n; \
|
|
if (x >= width) { \
|
|
y++; \
|
|
if (y >= height) \
|
|
return 0; \
|
|
x = 0; \
|
|
}
|
|
|
|
while (src_end - src >= 2) {
|
|
uint8_t v = *src++;
|
|
if (v > 0 && v < 0xC0) {
|
|
do {
|
|
int length = FFMIN(v, width - x);
|
|
if (length <= 0)
|
|
break;
|
|
memset(dst + y*linesize + x, RGB332_TO_BGR8(*src), length);
|
|
INC_XY(length);
|
|
v -= length;
|
|
} while (v > 0);
|
|
src++;
|
|
} else if (v >= 0xC1) {
|
|
v -= 0xC0;
|
|
do {
|
|
int length = FFMIN3(v, width - x, src_end - src);
|
|
if (src_end - src < length || length <= 0)
|
|
break;
|
|
memcpy_rgb332_to_bgr8(dst + y*linesize + x, src, length);
|
|
INC_XY(length);
|
|
src += length;
|
|
v -= length;
|
|
} while (v > 0);
|
|
} else {
|
|
avpriv_request_sample(avctx, "opcode %d", v);
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int sgirle_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *got_frame,
|
|
AVPacket *avpkt)
|
|
{
|
|
SGIRLEContext *s = avctx->priv_data;
|
|
int ret;
|
|
|
|
if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
|
|
return ret;
|
|
|
|
ret = decode_sgirle8(avctx, s->frame->data[0], avpkt->data, avpkt->size, avctx->width, avctx->height, s->frame->linesize[0]);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*got_frame = 1;
|
|
if ((ret = av_frame_ref(data, s->frame)) < 0)
|
|
return ret;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int sgirle_decode_end(AVCodecContext *avctx)
|
|
{
|
|
SGIRLEContext *s = avctx->priv_data;
|
|
|
|
av_frame_free(&s->frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_sgirle_decoder = {
|
|
.name = "sgirle",
|
|
.long_name = NULL_IF_CONFIG_SMALL("SGI RLE 8-bit"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_SGIRLE,
|
|
.priv_data_size = sizeof(SGIRLEContext),
|
|
.init = sgirle_decode_init,
|
|
.close = sgirle_decode_end,
|
|
.decode = sgirle_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
};
|