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Diffstat (limited to 'ffmpeg1/libavcodec/rl2.c')
| -rw-r--r-- | ffmpeg1/libavcodec/rl2.c | 226 |
1 files changed, 0 insertions, 226 deletions
diff --git a/ffmpeg1/libavcodec/rl2.c b/ffmpeg1/libavcodec/rl2.c deleted file mode 100644 index c8853de..0000000 --- a/ffmpeg1/libavcodec/rl2.c +++ /dev/null @@ -1,226 +0,0 @@ -/* - * RL2 Video Decoder - * Copyright (C) 2008 Sascha Sommer (saschasommer@freenet.de) - * - * 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 - */ - -/** - * @file - * RL2 Video Decoder - * @author Sascha Sommer (saschasommer@freenet.de) - * @see http://wiki.multimedia.cx/index.php?title=RL2 - */ - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include "libavutil/internal.h" -#include "libavutil/intreadwrite.h" -#include "libavutil/mem.h" -#include "avcodec.h" -#include "internal.h" - - -#define EXTRADATA1_SIZE (6 + 256 * 3) ///< video base, clr count, palette - -typedef struct Rl2Context { - AVCodecContext *avctx; - - uint16_t video_base; ///< initial drawing offset - uint32_t clr_count; ///< number of used colors (currently unused) - uint8_t *back_frame; ///< background frame - uint32_t palette[AVPALETTE_COUNT]; -} Rl2Context; - -/** - * Run Length Decode a single 320x200 frame - * @param s rl2 context - * @param in input buffer - * @param size input buffer size - * @param out output buffer - * @param stride stride of the output buffer - * @param video_base offset of the rle data inside the frame - */ -static void rl2_rle_decode(Rl2Context *s, const uint8_t *in, int size, - uint8_t *out, int stride, int video_base) -{ - int base_x = video_base % s->avctx->width; - int base_y = video_base / s->avctx->width; - int stride_adj = stride - s->avctx->width; - int i; - const uint8_t *back_frame = s->back_frame; - const uint8_t *in_end = in + size; - const uint8_t *out_end = out + stride * s->avctx->height; - uint8_t *line_end; - - /** copy start of the background frame */ - for (i = 0; i <= base_y; i++) { - if (s->back_frame) - memcpy(out, back_frame, s->avctx->width); - out += stride; - back_frame += s->avctx->width; - } - back_frame += base_x - s->avctx->width; - line_end = out - stride_adj; - out += base_x - stride; - - /** decode the variable part of the frame */ - while (in < in_end) { - uint8_t val = *in++; - int len = 1; - if (val >= 0x80) { - if (in >= in_end) - break; - len = *in++; - if (!len) - break; - } - - if (len >= out_end - out) - break; - - if (s->back_frame) - val |= 0x80; - else - val &= ~0x80; - - while (len--) { - *out++ = (val == 0x80) ? *back_frame : val; - back_frame++; - if (out == line_end) { - out += stride_adj; - line_end += stride; - if (len >= out_end - out) - break; - } - } - } - - /** copy the rest from the background frame */ - if (s->back_frame) { - while (out < out_end) { - memcpy(out, back_frame, line_end - out); - back_frame += line_end - out; - out = line_end + stride_adj; - line_end += stride; - } - } -} - - -/** - * Initialize the decoder - * @param avctx decoder context - * @return 0 success, -1 on error - */ -static av_cold int rl2_decode_init(AVCodecContext *avctx) -{ - Rl2Context *s = avctx->priv_data; - int back_size; - int i; - - s->avctx = avctx; - avctx->pix_fmt = AV_PIX_FMT_PAL8; - - /** parse extra data */ - if (!avctx->extradata || avctx->extradata_size < EXTRADATA1_SIZE) { - av_log(avctx, AV_LOG_ERROR, "invalid extradata size\n"); - return AVERROR(EINVAL); - } - - /** get frame_offset */ - s->video_base = AV_RL16(&avctx->extradata[0]); - s->clr_count = AV_RL32(&avctx->extradata[2]); - - if (s->video_base >= avctx->width * avctx->height) { - av_log(avctx, AV_LOG_ERROR, "invalid video_base\n"); - return AVERROR_INVALIDDATA; - } - - /** initialize palette */ - for (i = 0; i < AVPALETTE_COUNT; i++) - s->palette[i] = 0xFFU << 24 | AV_RB24(&avctx->extradata[6 + i * 3]); - - /** decode background frame if present */ - back_size = avctx->extradata_size - EXTRADATA1_SIZE; - - if (back_size > 0) { - uint8_t *back_frame = av_mallocz(avctx->width*avctx->height); - if (!back_frame) - return AVERROR(ENOMEM); - rl2_rle_decode(s, avctx->extradata + EXTRADATA1_SIZE, back_size, - back_frame, avctx->width, 0); - s->back_frame = back_frame; - } - return 0; -} - - -static int rl2_decode_frame(AVCodecContext *avctx, - void *data, int *got_frame, - AVPacket *avpkt) -{ - AVFrame *frame = data; - const uint8_t *buf = avpkt->data; - int ret, buf_size = avpkt->size; - Rl2Context *s = avctx->priv_data; - - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - - /** run length decode */ - rl2_rle_decode(s, buf, buf_size, frame->data[0], frame->linesize[0], - s->video_base); - - /** make the palette available on the way out */ - memcpy(frame->data[1], s->palette, AVPALETTE_SIZE); - - *got_frame = 1; - - /** report that the buffer was completely consumed */ - return buf_size; -} - - -/** - * Uninit decoder - * @param avctx decoder context - * @return 0 success, -1 on error - */ -static av_cold int rl2_decode_end(AVCodecContext *avctx) -{ - Rl2Context *s = avctx->priv_data; - - av_free(s->back_frame); - - return 0; -} - - -AVCodec ff_rl2_decoder = { - .name = "rl2", - .type = AVMEDIA_TYPE_VIDEO, - .id = AV_CODEC_ID_RL2, - .priv_data_size = sizeof(Rl2Context), - .init = rl2_decode_init, - .close = rl2_decode_end, - .decode = rl2_decode_frame, - .capabilities = CODEC_CAP_DR1, - .long_name = NULL_IF_CONFIG_SMALL("RL2 video"), -}; |