yading@10: /*
yading@10:  * AVRn decoder
yading@10:  * Copyright (c) 2012 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: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "mjpeg.h"
yading@10: #include "mjpegdec.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: 
yading@10: typedef struct {
yading@10:     MJpegDecodeContext mjpeg_ctx;
yading@10:     int is_mjpeg;
yading@10:     int interlace; //FIXME use frame.interlaced_frame
yading@10:     int tff;
yading@10: } AVRnContext;
yading@10: 
yading@10: static av_cold int init(AVCodecContext *avctx)
yading@10: {
yading@10:     AVRnContext *a = avctx->priv_data;
yading@10:     int ret;
yading@10: 
yading@10:     // Support "Resolution 1:1" for Avid AVI Codec
yading@10:     a->is_mjpeg = avctx->extradata_size < 31 || memcmp(&avctx->extradata[28], "1:1", 3);
yading@10: 
yading@10:     if(!a->is_mjpeg && avctx->lowres) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "lowres is not possible with rawvideo\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if(a->is_mjpeg)
yading@10:         return ff_mjpeg_decode_init(avctx);
yading@10: 
yading@10:     if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     avctx->pix_fmt = AV_PIX_FMT_UYVY422;
yading@10: 
yading@10:     if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) {
yading@10:         int ndx = avctx->extradata[4] + 4;
yading@10:         a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4);
yading@10:         if(a->interlace) {
yading@10:             a->tff = avctx->extradata[ndx + 24] == 1;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int end(AVCodecContext *avctx)
yading@10: {
yading@10:     AVRnContext *a = avctx->priv_data;
yading@10: 
yading@10:     if(a->is_mjpeg)
yading@10:         ff_mjpeg_decode_end(avctx);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_frame(AVCodecContext *avctx, void *data,
yading@10:                         int *got_frame, AVPacket *avpkt)
yading@10: {
yading@10:     AVRnContext *a = avctx->priv_data;
yading@10:     AVFrame *p = data;
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size       = avpkt->size;
yading@10:     int y, ret, true_height;
yading@10: 
yading@10:     if(a->is_mjpeg)
yading@10:         return ff_mjpeg_decode_frame(avctx, data, got_frame, avpkt);
yading@10: 
yading@10:     true_height    = buf_size / (2*avctx->width);
yading@10: 
yading@10:     if(buf_size < 2*avctx->width * avctx->height) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "packet too small\n");
yading@10:         return AVERROR_INVALIDDATA;
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:     if(a->interlace) {
yading@10:         buf += (true_height - avctx->height)*avctx->width;
yading@10:         for(y = 0; y < avctx->height-1; y+=2) {
yading@10:             memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf                             , 2*avctx->width);
yading@10:             memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width);
yading@10:             buf += 2*avctx->width;
yading@10:         }
yading@10:     } else {
yading@10:         buf += (true_height - avctx->height)*avctx->width*2;
yading@10:         for(y = 0; y < avctx->height; y++) {
yading@10:             memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width);
yading@10:             buf += 2*avctx->width;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     *got_frame      = 1;
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: AVCodec ff_avrn_decoder = {
yading@10:     .name           = "avrn",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_AVRN,
yading@10:     .priv_data_size = sizeof(AVRnContext),
yading@10:     .init           = init,
yading@10:     .close          = end,
yading@10:     .decode         = decode_frame,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Avid AVI Codec"),
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .max_lowres     = 3,
yading@10: };
yading@10: