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/*
* Interplay MVE Video Decoder
* Copyright (C) 2003 the ffmpeg project
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/**
* @file roqvideo.c
* Interplay MVE Video Decoder by Mike Melanson
* For more information about the Interplay MVE format, visit:
* http://www.pcisys.net/~melanson/codecs/
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "common.h"
#include "avcodec.h"
#include "dsputil.h"
typedef struct IpvideoContext {
AVCodecContext *avctx;
DSPContext dsp;
AVFrame last_frame;
AVFrame current_frame;
int first_frame;
int receiving_decoding_map;
unsigned char *decoding_map;
int decoding_map_size;
unsigned char *buf;
int size;
} IpvideoContext;
static int ipvideo_decode_init(AVCodecContext *avctx)
{
IpvideoContext *s = avctx->priv_data;
s->avctx = avctx;
avctx->pix_fmt = PIX_FMT_YUV444P;
avctx->has_b_frames = 0;
dsputil_init(&s->dsp, avctx);
s->first_frame = 1;
s->receiving_decoding_map = 1; /* decoding map will be received first */
/* decoding map contains 4 bits of information per 8x8 block */
s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2);
s->decoding_map = av_malloc(s->decoding_map_size);
return 0;
}
static int ipvideo_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
IpvideoContext *s = avctx->priv_data;
if (s->receiving_decoding_map) {
/* receiving the decoding map on this iteration */
s->receiving_decoding_map = 0;
if (buf_size != s->decoding_map_size)
printf (" Interplay video: buf_size != decoding_map_size (%d != %d)\n",
buf_size, s->decoding_map_size);
else
memcpy(s->decoding_map, buf, buf_size);
*data_size = 0;
*(AVFrame*)data = s->last_frame;
} else {
/* receiving the compressed video data on this iteration */
s->receiving_decoding_map = 1;
s->buf = buf;
s->size = buf_size;
if (avctx->get_buffer(avctx, &s->current_frame)) {
printf (" Interplay Video: get_buffer() failed\n");
return -1;
}
// ipvideo_decode_frame(s);
memset(s->current_frame.data[0], 0x80, s->current_frame.linesize[0] * avctx->height);
memset(s->current_frame.data[1], 0x80, s->current_frame.linesize[1] * avctx->height / 4);
memset(s->current_frame.data[2], 0x80, s->current_frame.linesize[2] * avctx->height / 4);
/* release the last frame if it is allocated */
if (s->first_frame)
s->first_frame = 0;
else
avctx->release_buffer(avctx, &s->last_frame);
/* shuffle frames */
s->last_frame = s->current_frame;
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->current_frame;
}
/* always report that the buffer was completely consumed */
return buf_size;
}
static int ipvideo_decode_end(AVCodecContext *avctx)
{
IpvideoContext *s = avctx->priv_data;
/* release the last frame */
avctx->release_buffer(avctx, &s->last_frame);
av_free(s->decoding_map);
return 0;
}
AVCodec interplay_video_decoder = {
"interplayvideo",
CODEC_TYPE_VIDEO,
CODEC_ID_INTERPLAY_VIDEO,
sizeof(IpvideoContext),
ipvideo_decode_init,
NULL,
ipvideo_decode_end,
ipvideo_decode_frame,
CODEC_CAP_DR1,
};
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