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https://github.com/FFmpeg/FFmpeg.git
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a247ac640d
Given that the AVCodec.next pointer has now been removed, most of the AVCodecs are not modified at all any more and can therefore be made const (as this patch does); the only exceptions are the very few codecs for external libraries that have a init_static_data callback. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
144 lines
4.7 KiB
C
144 lines
4.7 KiB
C
/*
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* Silicon Graphics RLE 8-bit video 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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* Silicon Graphics RLE 8-bit video decoder
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* @note Data is packed in rbg323 with rle, contained in mv or mov.
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* The algorithm and pixfmt are subtly different from SGI images.
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*/
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#include "libavutil/common.h"
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#include "avcodec.h"
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#include "internal.h"
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static av_cold int sgirle_decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = AV_PIX_FMT_BGR8;
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return 0;
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}
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/**
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* Convert SGI RBG323 pixel into AV_PIX_FMT_BGR8
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* SGI RGB data is packed as 8bpp, (msb)3R 2B 3G(lsb)
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*/
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#define RBG323_TO_BGR8(x) ((((x) << 3) & 0xC0) | \
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(((x) << 3) & 0x38) | \
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(((x) >> 5) & 7))
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static av_always_inline
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void rbg323_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] = RBG323_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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*
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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,
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const uint8_t *src, int src_size,
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int width, int height, ptrdiff_t 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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if (length <= 0)
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break;
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memset(dst + y * linesize + x, RBG323_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 || length <= 0)
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break;
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rbg323_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, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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AVFrame *frame = data;
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int ret;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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ret = decode_sgirle8(avctx, frame->data[0], avpkt->data, avpkt->size,
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avctx->width, avctx->height, frame->linesize[0]);
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if (ret < 0)
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return ret;
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->key_frame = 1;
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*got_frame = 1;
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return avpkt->size;
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}
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const AVCodec ff_sgirle_decoder = {
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.name = "sgirle",
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.long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics RLE 8-bit video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_SGIRLE,
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.init = sgirle_decode_init,
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.decode = sgirle_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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