yading@10: /*
yading@10:  * 012v 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 zero12v_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     avctx->pix_fmt             = AV_PIX_FMT_YUV422P16;
yading@10:     avctx->bits_per_raw_sample = 10;
yading@10: 
yading@10:     if (avctx->codec_tag == MKTAG('a', '1', '2', 'v'))
yading@10:         avpriv_request_sample(avctx, "transparency");
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int zero12v_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                                 int *got_frame, AVPacket *avpkt)
yading@10: {
yading@10:     int line = 0, ret;
yading@10:     const int width = avctx->width;
yading@10:     AVFrame *pic = data;
yading@10:     uint16_t *y, *u, *v;
yading@10:     const uint8_t *line_end, *src = avpkt->data;
yading@10:     int stride = avctx->width * 8 / 3;
yading@10: 
yading@10:     if (width == 1) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Width 1 not supported.\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if (avpkt->size < avctx->height * stride) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Packet too small: %d instead of %d\n",
yading@10:                avpkt->size, avctx->height * stride);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     pic->pict_type = AV_PICTURE_TYPE_I;
yading@10:     pic->key_frame = 1;
yading@10: 
yading@10:     y = (uint16_t *)pic->data[0];
yading@10:     u = (uint16_t *)pic->data[1];
yading@10:     v = (uint16_t *)pic->data[2];
yading@10:     line_end = avpkt->data + stride;
yading@10: 
yading@10:     while (line++ < avctx->height) {
yading@10:         while (1) {
yading@10:             uint32_t t = AV_RL32(src);
yading@10:             src += 4;
yading@10:             *u++ = t <<  6 & 0xFFC0;
yading@10:             *y++ = t >>  4 & 0xFFC0;
yading@10:             *v++ = t >> 14 & 0xFFC0;
yading@10: 
yading@10:             if (src >= line_end - 1) {
yading@10:                 *y = 0x80;
yading@10:                 src++;
yading@10:                 line_end += stride;
yading@10:                 y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
yading@10:                 u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
yading@10:                 v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
yading@10:                 break;
yading@10:             }
yading@10: 
yading@10:             t = AV_RL32(src);
yading@10:             src += 4;
yading@10:             *y++ = t <<  6 & 0xFFC0;
yading@10:             *u++ = t >>  4 & 0xFFC0;
yading@10:             *y++ = t >> 14 & 0xFFC0;
yading@10:             if (src >= line_end - 2) {
yading@10:                 if (!(width & 1)) {
yading@10:                     *y = 0x80;
yading@10:                     src += 2;
yading@10:                 }
yading@10:                 line_end += stride;
yading@10:                 y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
yading@10:                 u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
yading@10:                 v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
yading@10:                 break;
yading@10:             }
yading@10: 
yading@10:             t = AV_RL32(src);
yading@10:             src += 4;
yading@10:             *v++ = t <<  6 & 0xFFC0;
yading@10:             *y++ = t >>  4 & 0xFFC0;
yading@10:             *u++ = t >> 14 & 0xFFC0;
yading@10: 
yading@10:             if (src >= line_end - 1) {
yading@10:                 *y = 0x80;
yading@10:                 src++;
yading@10:                 line_end += stride;
yading@10:                 y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
yading@10:                 u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
yading@10:                 v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
yading@10:                 break;
yading@10:             }
yading@10: 
yading@10:             t = AV_RL32(src);
yading@10:             src += 4;
yading@10:             *y++ = t <<  6 & 0xFFC0;
yading@10:             *v++ = t >>  4 & 0xFFC0;
yading@10:             *y++ = t >> 14 & 0xFFC0;
yading@10: 
yading@10:             if (src >= line_end - 2) {
yading@10:                 if (width & 1) {
yading@10:                     *y = 0x80;
yading@10:                     src += 2;
yading@10:                 }
yading@10:                 line_end += stride;
yading@10:                 y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
yading@10:                 u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
yading@10:                 v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
yading@10:                 break;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return avpkt->size;
yading@10: }
yading@10: 
yading@10: AVCodec ff_zero12v_decoder = {
yading@10:     .name           = "012v",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_012V,
yading@10:     .init           = zero12v_decode_init,
yading@10:     .decode         = zero12v_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
yading@10: };