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