yading@10: /*
yading@10:  * ATI VCR1 codec
yading@10:  * Copyright (c) 2003 Michael Niedermayer
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * ATI VCR1 codec
yading@10:  */
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "libavutil/internal.h"
yading@10: 
yading@10: typedef struct VCR1Context {
yading@10:     int delta[16];
yading@10:     int offset[4];
yading@10: } VCR1Context;
yading@10: 
yading@10: static av_cold int vcr1_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     avctx->pix_fmt = AV_PIX_FMT_YUV410P;
yading@10: 
yading@10:     if (avctx->width % 8 || avctx->height%4) {
yading@10:         avpriv_request_sample(avctx, "odd dimensions support");
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                              int *got_frame, AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf        = avpkt->data;
yading@10:     int buf_size              = avpkt->size;
yading@10:     VCR1Context *const a      = avctx->priv_data;
yading@10:     AVFrame *const p          = data;
yading@10:     const uint8_t *bytestream = buf;
yading@10:     int i, x, y, ret;
yading@10: 
yading@10:     if(buf_size < 16 + avctx->height + avctx->width*avctx->height*5/8){
yading@10:         av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
yading@10:         return ret;
yading@10:     p->pict_type = AV_PICTURE_TYPE_I;
yading@10:     p->key_frame = 1;
yading@10: 
yading@10:     for (i = 0; i < 16; i++) {
yading@10:         a->delta[i] = *bytestream++;
yading@10:         bytestream++;
yading@10:     }
yading@10: 
yading@10:     for (y = 0; y < avctx->height; y++) {
yading@10:         int offset;
yading@10:         uint8_t *luma = &p->data[0][y * p->linesize[0]];
yading@10: 
yading@10:         if ((y & 3) == 0) {
yading@10:             uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]];
yading@10:             uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]];
yading@10: 
yading@10:             for (i = 0; i < 4; i++)
yading@10:                 a->offset[i] = *bytestream++;
yading@10: 
yading@10:             offset = a->offset[0] - a->delta[bytestream[2] & 0xF];
yading@10:             for (x = 0; x < avctx->width; x += 4) {
yading@10:                 luma[0]     = offset += a->delta[bytestream[2] & 0xF];
yading@10:                 luma[1]     = offset += a->delta[bytestream[2] >>  4];
yading@10:                 luma[2]     = offset += a->delta[bytestream[0] & 0xF];
yading@10:                 luma[3]     = offset += a->delta[bytestream[0] >>  4];
yading@10:                 luma       += 4;
yading@10: 
yading@10:                 *cb++       = bytestream[3];
yading@10:                 *cr++       = bytestream[1];
yading@10: 
yading@10:                 bytestream += 4;
yading@10:             }
yading@10:         } else {
yading@10:             offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF];
yading@10: 
yading@10:             for (x = 0; x < avctx->width; x += 8) {
yading@10:                 luma[0]     = offset += a->delta[bytestream[2] & 0xF];
yading@10:                 luma[1]     = offset += a->delta[bytestream[2] >>  4];
yading@10:                 luma[2]     = offset += a->delta[bytestream[3] & 0xF];
yading@10:                 luma[3]     = offset += a->delta[bytestream[3] >>  4];
yading@10:                 luma[4]     = offset += a->delta[bytestream[0] & 0xF];
yading@10:                 luma[5]     = offset += a->delta[bytestream[0] >>  4];
yading@10:                 luma[6]     = offset += a->delta[bytestream[1] & 0xF];
yading@10:                 luma[7]     = offset += a->delta[bytestream[1] >>  4];
yading@10:                 luma       += 8;
yading@10:                 bytestream += 4;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: AVCodec ff_vcr1_decoder = {
yading@10:     .name           = "vcr1",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_VCR1,
yading@10:     .priv_data_size = sizeof(VCR1Context),
yading@10:     .init           = vcr1_decode_init,
yading@10:     .decode         = vcr1_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("ATI VCR1"),
yading@10: };