150 lines
4.2 KiB
C
150 lines
4.2 KiB
C
/*
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* SGI RLE 8-bit decoder
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* Copyright (c) 2012 Peter Ross
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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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* SGI RLE 8-bit decoder
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*/
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#include "avcodec.h"
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#include "internal.h"
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typedef struct SGIRLEContext {
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AVFrame *frame;
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} SGIRLEContext;
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static av_cold int sgirle_decode_init(AVCodecContext *avctx)
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{
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SGIRLEContext *s = avctx->priv_data;
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avctx->pix_fmt = AV_PIX_FMT_BGR8;
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s->frame = av_frame_alloc();
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if (!s->frame)
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return AVERROR(ENOMEM);
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return 0;
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}
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/**
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* Convert SGI RGB332 pixel into PIX_FMT_BGR8
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* SGI RGB332 is packed RGB 3:3:2, 8bpp, (msb)3R 2B 3G(lsb)
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*/
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#define RGB332_TO_BGR8(x) (((x << 3) & 0xC0) | ((x << 3) & 0x38) | ((x >> 5) & 7))
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static av_always_inline void memcpy_rgb332_to_bgr8(uint8_t *dst, const uint8_t *src, int size)
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{
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int i;
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for (i = 0; i < size; i++)
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dst[i] = RGB332_TO_BGR8(src[i]);
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}
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/**
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* @param[out] dst Destination buffer
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* @param[in] src Source buffer
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* @param src_size Source buffer size (bytes)
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* @param width Width of destination buffer (pixels)
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* @param height Height of destination buffer (pixels)
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* @param linesize Line size of destination buffer (bytes)
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* @return <0 on error
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*/
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static int decode_sgirle8(AVCodecContext *avctx, uint8_t *dst, const uint8_t *src, int src_size, int width, int height, int linesize)
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{
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const uint8_t *src_end = src + src_size;
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int x = 0, y = 0;
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#define INC_XY(n) \
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x += n; \
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if (x >= width) { \
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y++; \
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if (y >= height) \
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return 0; \
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x = 0; \
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}
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while (src_end - src >= 2) {
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uint8_t v = *src++;
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if (v > 0 && v < 0xC0) {
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do {
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int length = FFMIN(v, width - x);
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memset(dst + y*linesize + x, RGB332_TO_BGR8(*src), length);
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INC_XY(length);
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v -= length;
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} while (v > 0);
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src++;
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} else if (v >= 0xC1) {
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v -= 0xC0;
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do {
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int length = FFMIN3(v, width - x, src_end - src);
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if (src_end - src < length)
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break;
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memcpy_rgb332_to_bgr8(dst + y*linesize + x, src, length);
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INC_XY(length);
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src += length;
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v -= length;
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} while (v > 0);
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} else {
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avpriv_request_sample(avctx, "opcode %d", v);
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return AVERROR_PATCHWELCOME;
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}
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}
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return 0;
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}
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static int sgirle_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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SGIRLEContext *s = avctx->priv_data;
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int ret;
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if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
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return ret;
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ret = decode_sgirle8(avctx, s->frame->data[0], avpkt->data, avpkt->size, avctx->width, avctx->height, s->frame->linesize[0]);
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if (ret < 0)
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return ret;
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*got_frame = 1;
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if ((ret = av_frame_ref(data, s->frame)) < 0)
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return ret;
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return avpkt->size;
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}
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static av_cold int sgirle_decode_end(AVCodecContext *avctx)
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{
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SGIRLEContext *s = avctx->priv_data;
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av_frame_free(&s->frame);
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return 0;
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}
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AVCodec ff_sgirle_decoder = {
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.name = "sgirle",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_SGIRLE,
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.priv_data_size = sizeof(SGIRLEContext),
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.init = sgirle_decode_init,
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.close = sgirle_decode_end,
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.decode = sgirle_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("SGI RLE 8-bit"),
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};
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