* RL2 Video Decoder
* Copyright (C) 2008 Sascha Sommer (saschasommer@freenet.de)
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
+ * @file
* 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
+ * @see http://wiki.multimedia.cx/index.php?title=RL2
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <unistd.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;
- 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];
+ 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 buf input buffer
+ * @param in input buffer
* @param size input buffer size
- * @param out ouput buffer
+ * @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 unsigned char* in,int size,
- unsigned char* out,int stride,int video_base){
+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 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;
+ 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;
+ 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;
+ 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)
+ while (in < in_end) {
+ uint8_t val = *in++;
+ int len = 1;
+ if (val >= 0x80) {
+ if (in >= in_end)
break;
len = *in++;
- if(!len)
+ if (!len)
break;
}
- if(len >= out_end - out)
+ if (len >= out_end - out)
break;
- if(s->back_frame)
+ if (s->back_frame)
val |= 0x80;
else
val &= ~0x80;
- while(len--){
- *out++ = (val == 0x80)? *back_frame:val;
+ while (len--) {
+ *out++ = (val == 0x80) ? *back_frame : val;
back_frame++;
- if(out == line_end){
- out += stride_adj;
+ if (out == line_end) {
+ out += stride_adj;
line_end += stride;
- if(len >= out_end - out)
+ if (len >= out_end - out)
break;
}
}
}
/** copy the rest from the background frame */
- if(s->back_frame){
- while(out < out_end){
+ 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;
+ out = line_end + stride_adj;
+ line_end += stride;
}
}
}
Rl2Context *s = avctx->priv_data;
int back_size;
int i;
- s->avctx = avctx;
- avctx->pix_fmt = PIX_FMT_PAL8;
+
+ s->avctx = avctx;
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
/** parse extra data */
- if(!avctx->extradata || avctx->extradata_size < EXTRADATA1_SIZE){
+ if (!avctx->extradata || avctx->extradata_size < EXTRADATA1_SIZE) {
av_log(avctx, AV_LOG_ERROR, "invalid extradata size\n");
- return -1;
+ return AVERROR(EINVAL);
}
/** get frame_offset */
s->video_base = AV_RL16(&avctx->extradata[0]);
- s->clr_count = AV_RL32(&avctx->extradata[2]);
+ s->clr_count = AV_RL32(&avctx->extradata[2]);
- if(s->video_base >= avctx->width * avctx->height){
+ if (s->video_base >= avctx->width * avctx->height) {
av_log(avctx, AV_LOG_ERROR, "invalid video_base\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
/** initialize palette */
- for(i=0;i<AVPALETTE_COUNT;i++)
+ for (i = 0; i < AVPALETTE_COUNT; i++)
s->palette[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);
+ 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;
}
-/**
- * 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)
+ 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(s->frame.data[0])
- avctx->release_buffer(avctx, &s->frame);
-
- /** get buffer */
- s->frame.reference= 0;
- if(avctx->get_buffer(avctx, &s->frame)) {
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return -1;
+ return ret;
}
/** run length decode */
- rl2_rle_decode(s,buf,buf_size,s->frame.data[0],s->frame.linesize[0],s->video_base);
+ 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(s->frame.data[1], s->palette, AVPALETTE_SIZE);
+ memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = s->frame;
+ *got_frame = 1;
/** report that the buffer was completely consumed */
return buf_size;
{
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,
+AVCodec ff_rl2_decoder = {
+ .name = "rl2",
+ .long_name = NULL_IF_CONFIG_SMALL("RL2 video"),
+ .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 = AV_CODEC_CAP_DR1,
};
-
projects / ffmpeg / blobdiff