mirror of
https://github.com/FFmpeg/FFmpeg.git
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df3cdf4c75
This is done generically now. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
150 lines
4.6 KiB
C
150 lines
4.6 KiB
C
/*
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* RTV1 decoder
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* Copyright (c) 2023 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <string.h>
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#include "avcodec.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "decode.h"
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#include "texturedsp.h"
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#include "thread.h"
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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TextureDSPContext *dsp = avctx->priv_data;
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avctx->pix_fmt = AV_PIX_FMT_BGR0;
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ff_texturedsp_init(dsp);
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return 0;
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}
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static int decode_rtv1(GetByteContext *gb, uint8_t *dst, ptrdiff_t linesize,
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int width, int height, int flag,
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int (*dxt1_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block))
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{
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uint8_t block[8] = { 0 };
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int run = 0;
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for (int y = 0; y < height; y += 4) {
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for (int x = 0; x < width * 4; x += 16) {
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int mode = 0;
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if (run && --run > 0) {
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dxt1_block(dst + x, linesize, block);
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} else {
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int a, b;
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if (bytestream2_get_bytes_left(gb) < 4)
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return AVERROR_INVALIDDATA;
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a = bytestream2_get_le16u(gb);
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b = bytestream2_get_le16u(gb);
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if (a == b && flag) {
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AV_WL32(block + 4, 0);
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} else if (a == 1 && b == 0xffff) {
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mode = 1;
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} else if (b && a == 0) {
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run = b;
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} else {
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AV_WL16(block, a);
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AV_WL16(block + 2, b);
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AV_WL32(block + 4, bytestream2_get_le32(gb));
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}
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if (run && !mode) {
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dxt1_block(dst + x, linesize, block);
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} else if (!mode) {
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AV_WL16(block, a);
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AV_WL16(block + 2, b);
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dxt1_block(dst + x, linesize, block);
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} else {
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if (bytestream2_get_bytes_left(gb) < 12 * 4)
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return AVERROR_INVALIDDATA;
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for (int by = 0; by < 4; by++) {
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for (int bx = 0; bx < 4; bx++)
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AV_WL32(dst + x + bx * 4 + by * linesize, bytestream2_get_le24u(gb));
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}
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}
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}
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}
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dst += linesize * 4;
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}
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx, AVFrame *p,
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int *got_frame, AVPacket *avpkt)
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{
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int ret, width, height, flags;
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TextureDSPContext *dsp = avctx->priv_data;
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GetByteContext gb;
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ptrdiff_t linesize;
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uint8_t *dst;
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if (avpkt->size < 22)
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return AVERROR_INVALIDDATA;
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bytestream2_init(&gb, avpkt->data, avpkt->size);
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if (bytestream2_get_le32(&gb) != MKTAG('D','X','T','1'))
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return AVERROR_INVALIDDATA;
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flags = bytestream2_get_le32(&gb);
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width = bytestream2_get_le32(&gb);
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height = bytestream2_get_le32(&gb);
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if (width > INT_MAX-4U || height > INT_MAX-4U)
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return AVERROR_INVALIDDATA;
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ret = ff_set_dimensions(avctx, FFALIGN(width, 4), FFALIGN(height, 4));
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if (ret < 0)
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return ret;
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avctx->width = width;
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avctx->height = height;
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if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
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return ret;
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dst = p->data[0] + p->linesize[0] * (avctx->coded_height - 1);
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linesize = -p->linesize[0];
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ret = decode_rtv1(&gb, dst, linesize, width, height, flags, dsp->dxt1_block);
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if (ret < 0)
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return ret;
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*got_frame = 1;
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return avpkt->size;
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}
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const FFCodec ff_rtv1_decoder = {
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.p.name = "rtv1",
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CODEC_LONG_NAME("RTV1 (RivaTuner Video)"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_RTV1,
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.priv_data_size = sizeof(TextureDSPContext),
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.init = decode_init,
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FF_CODEC_DECODE_CB(decode_frame),
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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
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};
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