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/*
* RTV1 decoder
* Copyright (c) 2023 Paul B Mahol
*
* 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 <stdio.h>
#include <string.h>
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "decode.h"
#include "texturedsp.h"
#include "thread.h"
static av_cold int decode_init(AVCodecContext *avctx)
{
TextureDSPContext *dsp = avctx->priv_data;
avctx->pix_fmt = AV_PIX_FMT_BGR0;
ff_texturedsp_init(dsp);
return 0;
}
static int decode_rtv1(GetByteContext *gb, uint8_t *dst, ptrdiff_t linesize,
int width, int height, int flag,
int (*dxt1_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block))
{
uint8_t block[8] = { 0 };
int run = 0;
for (int y = 0; y < height; y += 4) {
for (int x = 0; x < width * 4; x += 16) {
int mode = 0;
if (run && --run > 0) {
dxt1_block(dst + x, linesize, block);
} else {
int a, b;
if (bytestream2_get_bytes_left(gb) < 4)
break;
a = bytestream2_get_le16u(gb);
b = bytestream2_get_le16u(gb);
if (a == b && flag) {
AV_WL32(block + 4, 0);
} else if (a == 1 && b == 0xffff) {
mode = 1;
} else if (b && a == 0) {
run = b;
} else {
AV_WL16(block, a);
AV_WL16(block + 2, b);
AV_WL32(block + 4, bytestream2_get_le32(gb));
}
if (run && !mode) {
dxt1_block(dst + x, linesize, block);
} else if (!mode) {
AV_WL16(block, a);
AV_WL16(block + 2, b);
dxt1_block(dst + x, linesize, block);
} else {
if (bytestream2_get_bytes_left(gb) < 12 * 4)
break;
for (int by = 0; by < 4; by++) {
for (int bx = 0; bx < 4; bx++)
AV_WL32(dst + x + bx * 4 + by * linesize, bytestream2_get_le24u(gb));
}
}
}
}
dst += linesize * 4;
}
return 0;
}
static int decode_frame(AVCodecContext *avctx, AVFrame *p,
int *got_frame, AVPacket *avpkt)
{
int ret, width, height, flags;
TextureDSPContext *dsp = avctx->priv_data;
GetByteContext gb;
ptrdiff_t linesize;
uint8_t *dst;
if (avpkt->size < 22)
return AVERROR_INVALIDDATA;
bytestream2_init(&gb, avpkt->data, avpkt->size);
if (bytestream2_get_le32(&gb) != MKTAG('D','X','T','1'))
return AVERROR_INVALIDDATA;
flags = bytestream2_get_le32(&gb);
width = bytestream2_get_le32(&gb);
height = bytestream2_get_le32(&gb);
ret = ff_set_dimensions(avctx, FFALIGN(width, 4), FFALIGN(height, 4));
if (ret < 0)
return ret;
avctx->width = width;
avctx->height = height;
if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
return ret;
dst = p->data[0] + p->linesize[0] * (avctx->coded_height - 1);
linesize = -p->linesize[0];
decode_rtv1(&gb, dst, linesize, width, height, flags, dsp->dxt1_block);
p->pict_type = AV_PICTURE_TYPE_I;
p->flags |= AV_FRAME_FLAG_KEY;
*got_frame = 1;
return avpkt->size;
}
const FFCodec ff_rtv1_decoder = {
.p.name = "rtv1",
CODEC_LONG_NAME("RTV1 (RivaTuner Video)"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_RTV1,
.priv_data_size = sizeof(TextureDSPContext),
.init = decode_init,
FF_CODEC_DECODE_CB(decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
};
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