mirror of
https://git.ffmpeg.org/ffmpeg.git
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138 lines
3.7 KiB
C
138 lines
3.7 KiB
C
/*
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* Miro VideoXL codec
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* Copyright (c) 2004 Konstantin Shishkov
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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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/**
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* @file
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* Miro VideoXL codec.
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*/
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#include "libavutil/common.h"
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "codec_internal.h"
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#include "decode.h"
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static const int xl_table[32] = {
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0, 1, 2, 3, 4, 5, 6, 7,
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8, 9, 12, 15, 20, 25, 34, 46,
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64, 82, 94, 103, 108, 113, 116, 119,
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120, 121, 122, 123, 124, 125, 126, 127
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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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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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uint8_t *Y, *U, *V;
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int i, j, ret;
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int stride;
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uint32_t val;
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int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0;
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if (avctx->width % 4) {
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av_log(avctx, AV_LOG_ERROR, "width is not a multiple of 4\n");
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return AVERROR_INVALIDDATA;
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}
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if (buf_size < avctx->width * avctx->height) {
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av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
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return AVERROR_INVALIDDATA;
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}
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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return ret;
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p->pict_type = AV_PICTURE_TYPE_I;
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p->flags |= AV_FRAME_FLAG_KEY;
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Y = p->data[0];
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U = p->data[1];
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V = p->data[2];
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stride = avctx->width - 4;
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for (i = 0; i < avctx->height; i++) {
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/* lines are stored in reversed order */
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buf += stride;
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for (j = 0; j < avctx->width; j += 4) {
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/* value is stored in LE dword with word swapped */
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val = AV_RL32(buf);
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buf -= 4;
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val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16);
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if (!j)
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y0 = (val & 0x1F) << 2;
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else
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y0 = y3 + xl_table[val & 0x1F];
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val >>= 5;
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y1 = y0 + xl_table[val & 0x1F];
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val >>= 5;
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y2 = y1 + xl_table[val & 0x1F];
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val >>= 6; /* align to word */
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y3 = y2 + xl_table[val & 0x1F];
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val >>= 5;
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if (!j)
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c0 = (val & 0x1F) << 2;
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else
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c0 += xl_table[val & 0x1F];
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val >>= 5;
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if (!j)
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c1 = (val & 0x1F) << 2;
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else
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c1 += xl_table[val & 0x1F];
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Y[j + 0] = y0 << 1;
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Y[j + 1] = y1 << 1;
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Y[j + 2] = y2 << 1;
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Y[j + 3] = y3 << 1;
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U[j >> 2] = c0 << 1;
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V[j >> 2] = c1 << 1;
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}
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buf += avctx->width + 4;
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Y += p->linesize[0];
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U += p->linesize[1];
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V += p->linesize[2];
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}
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*got_frame = 1;
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return buf_size;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = AV_PIX_FMT_YUV411P;
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return 0;
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}
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const FFCodec ff_xl_decoder = {
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.p.name = "xl",
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CODEC_LONG_NAME("Miro VideoXL"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_VIXL,
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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,
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};
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