From 975cdc8fc1695468b80a7d84d2de2ba1f088f7e5 Mon Sep 17 00:00:00 2001 From: Sascha Sommer Date: Fri, 21 Mar 2008 13:45:55 +0000 Subject: [PATCH] rl2 decoder Originally committed as revision 12543 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/Makefile | 1 + libavcodec/allcodecs.c | 1 + libavcodec/avcodec.h | 3 +- libavcodec/rl2.c | 240 +++++++++++++++++++++++++++++++++++++++++ 4 files changed, 244 insertions(+), 1 deletion(-) create mode 100644 libavcodec/rl2.c diff --git a/libavcodec/Makefile b/libavcodec/Makefile index eda1fb952c..b7896563cb 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -152,6 +152,7 @@ OBJS-$(CONFIG_RA_144_DECODER) += ra144.o OBJS-$(CONFIG_RA_288_DECODER) += ra288.o OBJS-$(CONFIG_RAWVIDEO_DECODER) += rawdec.o OBJS-$(CONFIG_RAWVIDEO_ENCODER) += rawenc.o +OBJS-$(CONFIG_RL2_DECODER) += rl2.o OBJS-$(CONFIG_ROQ_DECODER) += roqvideodec.o roqvideo.o OBJS-$(CONFIG_ROQ_ENCODER) += roqvideoenc.o roqvideo.o elbg.o OBJS-$(CONFIG_ROQ_DPCM_DECODER) += dpcm.o diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c index 8cb800f1cb..b574cd72cd 100644 --- a/libavcodec/allcodecs.c +++ b/libavcodec/allcodecs.c @@ -129,6 +129,7 @@ void avcodec_register_all(void) REGISTER_DECODER (QPEG, qpeg); REGISTER_ENCDEC (QTRLE, qtrle); REGISTER_ENCDEC (RAWVIDEO, rawvideo); + REGISTER_DECODER (RL2, rl2); REGISTER_ENCDEC (ROQ, roq); REGISTER_DECODER (RPZA, rpza); REGISTER_ENCDEC (RV10, rv10); diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h index e348ee72fc..e7794c9bea 100644 --- a/libavcodec/avcodec.h +++ b/libavcodec/avcodec.h @@ -30,7 +30,7 @@ #include "libavutil/avutil.h" #define LIBAVCODEC_VERSION_MAJOR 51 -#define LIBAVCODEC_VERSION_MINOR 52 +#define LIBAVCODEC_VERSION_MINOR 53 #define LIBAVCODEC_VERSION_MICRO 0 #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \ @@ -178,6 +178,7 @@ enum CodecID { CODEC_ID_INDEO4, CODEC_ID_INDEO5, CODEC_ID_MIMIC, + CODEC_ID_RL2, /* various PCM "codecs" */ CODEC_ID_PCM_S16LE= 0x10000, diff --git a/libavcodec/rl2.c b/libavcodec/rl2.c new file mode 100644 index 0000000000..85aeeccbdf --- /dev/null +++ b/libavcodec/rl2.c @@ -0,0 +1,240 @@ +/* + * 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 + */ + +/** + * RL2 Video Decoder + * @file rl2.c + * @author Sascha Sommer (saschasommer@freenet.de) + * For more information about the RL2 format, visit: + * http://wiki.multimedia.cx/index.php?title=RL2 + */ + +#include +#include +#include +#include + +#include "avcodec.h" + + +#define EXTRADATA1_SIZE (6 + 256 * 3) ///< video base, clr count, palette + +typedef struct Rl2Context { + AVCodecContext *avctx; + AVFrame frame; + + unsigned short video_base; ///< initial drawing offset + unsigned int clr_count; ///< number of used colors (currently unused) + unsigned char* back_frame; ///< background frame + unsigned int palette[AVPALETTE_COUNT]; +} Rl2Context; + +/** + * Run Length Decode a single 320x200 frame + * @param s rl2 context + * @param buf input buffer + * @param size input buffer size + * @param out ouput 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 unsigned char* in,int size, + unsigned char* 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 unsigned char* back_frame = s->back_frame; + const unsigned char* in_end = in + size; + const unsigned char* out_end = out + stride * s->avctx->height; + unsigned char* line_end = out + s->avctx->width; + + /** 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){ + unsigned char 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 = 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 -1; + } + + /** 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 -1; + } + + /** initialize palette */ + for(i=0;ipalette[i] = AV_RB24(&avctx->extradata[6 + i * 3]); + + /** decode background frame if present */ + back_size = avctx->extradata_size - EXTRADATA1_SIZE; + + if(back_size > 0){ + unsigned char* back_frame = av_mallocz(avctx->width*avctx->height); + if(!back_frame) + return -1; + rl2_rle_decode(s,avctx->extradata + EXTRADATA1_SIZE,back_size, + back_frame,avctx->width,0); + s->back_frame = back_frame; + } + return 0; +} + + +/** + * Decode a single frame + * @param avctx decoder context + * @param data decoded frame + * @param data_size size of the decoded frame + * @param buf input buffer + * @param buf_size input buffer size + * @return 0 success, -1 on error + */ +static int rl2_decode_frame(AVCodecContext *avctx, + void *data, int *data_size, + const uint8_t *buf, int buf_size) +{ + Rl2Context *s = avctx->priv_data; + + if(s->frame.data[0]) + avctx->release_buffer(avctx, &s->frame); + + /** get buffer */ + s->frame.reference= 0; + if(avctx->get_buffer(avctx, &s->frame)) { + av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return -1; + } + + /** run length decode */ + rl2_rle_decode(s,buf,buf_size,s->frame.data[0],s->frame.linesize[0],s->video_base); + + /** make the palette available on the way out */ + memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE); + + *data_size = sizeof(AVFrame); + *(AVFrame*)data = s->frame; + + /** 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; + + if(s->frame.data[0]) + avctx->release_buffer(avctx, &s->frame); + + av_free(s->back_frame); + + return 0; +} + + +AVCodec rl2_decoder = { + "rl2", + CODEC_TYPE_VIDEO, + CODEC_ID_RL2, + sizeof(Rl2Context), + rl2_decode_init, + NULL, + rl2_decode_end, + rl2_decode_frame, + CODEC_CAP_DR1, +}; +