yading@10: /*
yading@10:  * AVID Meridien decoder
yading@10:  *
yading@10:  * Copyright (c) 2012 Carl Eugen Hoyos
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 "libavutil/intreadwrite.h"
yading@10: 
yading@10: static av_cold int avui_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int avui_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                              int *got_frame, AVPacket *avpkt)
yading@10: {
yading@10:     int ret;
yading@10:     AVFrame *pic = data;
yading@10:     const uint8_t *src = avpkt->data, *extradata = avctx->extradata;
yading@10:     const uint8_t *srca;
yading@10:     uint8_t *y, *u, *v, *a;
yading@10:     int transparent, interlaced = 1, skip, opaque_length, i, j, k;
yading@10:     uint32_t extradata_size = avctx->extradata_size;
yading@10: 
yading@10:     while (extradata_size >= 24) {
yading@10:         uint32_t atom_size = AV_RB32(extradata);
yading@10:         if (!memcmp(&extradata[4], "APRGAPRG0001", 12)) {
yading@10:             interlaced = extradata[19] != 1;
yading@10:             break;
yading@10:         }
yading@10:         if (atom_size && atom_size <= extradata_size) {
yading@10:             extradata      += atom_size;
yading@10:             extradata_size -= atom_size;
yading@10:         } else {
yading@10:             break;
yading@10:         }
yading@10:     }
yading@10:     if (avctx->height == 486) {
yading@10:         skip = 10;
yading@10:     } else {
yading@10:         skip = 16;
yading@10:     }
yading@10:     opaque_length = 2 * avctx->width * (avctx->height + skip) + 4 * interlaced;
yading@10:     if (avpkt->size < opaque_length) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     transparent = avctx->bits_per_coded_sample == 32 &&
yading@10:                   avpkt->size >= opaque_length * 2 + 4;
yading@10:     srca = src + opaque_length + 5;
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     pic->key_frame = 1;
yading@10:     pic->pict_type = AV_PICTURE_TYPE_I;
yading@10: 
yading@10:     if (!interlaced) {
yading@10:         src  += avctx->width * skip;
yading@10:         srca += avctx->width * skip;
yading@10:     }
yading@10: 
yading@10:     for (i = 0; i < interlaced + 1; i++) {
yading@10:         src  += avctx->width * skip;
yading@10:         srca += avctx->width * skip;
yading@10:         if (interlaced && avctx->height == 486) {
yading@10:             y = pic->data[0] + (1 - i) * pic->linesize[0];
yading@10:             u = pic->data[1] + (1 - i) * pic->linesize[1];
yading@10:             v = pic->data[2] + (1 - i) * pic->linesize[2];
yading@10:             a = pic->data[3] + (1 - i) * pic->linesize[3];
yading@10:         } else {
yading@10:             y = pic->data[0] + i * pic->linesize[0];
yading@10:             u = pic->data[1] + i * pic->linesize[1];
yading@10:             v = pic->data[2] + i * pic->linesize[2];
yading@10:             a = pic->data[3] + i * pic->linesize[3];
yading@10:         }
yading@10: 
yading@10:         for (j = 0; j < avctx->height >> interlaced; j++) {
yading@10:             for (k = 0; k < avctx->width >> 1; k++) {
yading@10:                 u[    k    ] = *src++;
yading@10:                 y[2 * k    ] = *src++;
yading@10:                 a[2 * k    ] = 0xFF - (transparent ? *srca++ : 0);
yading@10:                 srca++;
yading@10:                 v[    k    ] = *src++;
yading@10:                 y[2 * k + 1] = *src++;
yading@10:                 a[2 * k + 1] = 0xFF - (transparent ? *srca++ : 0);
yading@10:                 srca++;
yading@10:             }
yading@10: 
yading@10:             y += (interlaced + 1) * pic->linesize[0];
yading@10:             u += (interlaced + 1) * pic->linesize[1];
yading@10:             v += (interlaced + 1) * pic->linesize[2];
yading@10:             a += (interlaced + 1) * pic->linesize[3];
yading@10:         }
yading@10:         src  += 4;
yading@10:         srca += 4;
yading@10:     }
yading@10:     *got_frame       = 1;
yading@10: 
yading@10:     return avpkt->size;
yading@10: }
yading@10: 
yading@10: AVCodec ff_avui_decoder = {
yading@10:     .name         = "avui",
yading@10:     .type         = AVMEDIA_TYPE_VIDEO,
yading@10:     .id           = AV_CODEC_ID_AVUI,
yading@10:     .init         = avui_decode_init,
yading@10:     .decode       = avui_decode_frame,
yading@10:     .capabilities = CODEC_CAP_DR1,
yading@10:     .long_name    = NULL_IF_CONFIG_SMALL("Avid Meridien Uncompressed"),
yading@10: };