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/*

 * 012v decoder

 *

 * Copyright (C) 2012 Carl Eugen Hoyos

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include "avcodec.h"

#include "internal.h"

#include "libavutil/intreadwrite.h"

static av_cold int zero12v_decode_init(AVCodecContext *avctx)

{

    avctx->pix_fmt             = AV_PIX_FMT_YUV422P16;

    avctx->bits_per_raw_sample = 10;

    if (avctx->codec_tag == MKTAG('a', '1', '2', 'v'))

        avpriv_request_sample(avctx, "transparency");

    return 0;

}

static int zero12v_decode_frame(AVCodecContext *avctx, void *data,

                                int *got_frame, AVPacket *avpkt)

{

    int line = 0, ret;

    const int width = avctx->width;

    AVFrame *pic = data;

    uint16_t *y, *u, *v;

    const uint8_t *line_end, *src = avpkt->data;

    int stride = avctx->width * 8 / 3;

    if (width == 1) {

        av_log(avctx, AV_LOG_ERROR, "Width 1 not supported.\n");

        return AVERROR_INVALIDDATA;

    }

    if (   avctx->codec_tag == MKTAG('0', '1', '2', 'v')

        && avpkt->size % avctx->height == 0

        && avpkt->size / avctx->height * 3 >= width * 8)

        stride = avpkt->size / avctx->height;

    if (avpkt->size < avctx->height * stride) {

        av_log(avctx, AV_LOG_ERROR, "Packet too small: %d instead of %d\n",

               avpkt->size, avctx->height * stride);

        return AVERROR_INVALIDDATA;

    }

    if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)

        return ret;

    pic->pict_type = AV_PICTURE_TYPE_I;

    pic->key_frame = 1;

    y = (uint16_t *)pic->data[0];

    u = (uint16_t *)pic->data[1];

    v = (uint16_t *)pic->data[2];

    line_end = avpkt->data + stride;

    while (line++ < avctx->height) {

        while (1) {

            uint32_t t = AV_RL32(src);

            src += 4;

            *u++ = t <<  6 & 0xFFC0;

            *y++ = t >>  4 & 0xFFC0;

            *v++ = t >> 14 & 0xFFC0;

            if (src >= line_end - 1) {

                *y = 0x80;

                src++;

                line_end += stride;

                y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);

                u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);

                v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);

                break;

            }

            t = AV_RL32(src);

            src += 4;

            *y++ = t <<  6 & 0xFFC0;

            *u++ = t >>  4 & 0xFFC0;

            *y++ = t >> 14 & 0xFFC0;

            if (src >= line_end - 2) {

                if (!(width & 1)) {

                    *y = 0x80;

                    src += 2;

                }

                line_end += stride;

                y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);

                u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);

                v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);

                break;

            }

            t = AV_RL32(src);

            src += 4;

            *v++ = t <<  6 & 0xFFC0;

            *y++ = t >>  4 & 0xFFC0;

            *u++ = t >> 14 & 0xFFC0;

            if (src >= line_end - 1) {

                *y = 0x80;

                src++;

                line_end += stride;

                y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);

                u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);

                v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);

                break;

            }

            t = AV_RL32(src);

            src += 4;

            *y++ = t <<  6 & 0xFFC0;

            *v++ = t >>  4 & 0xFFC0;

            *y++ = t >> 14 & 0xFFC0;

            if (src >= line_end - 2) {

                if (width & 1) {

                    *y = 0x80;

                    src += 2;

                }

                line_end += stride;

                y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);

                u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);

                v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);

                break;

            }

        }

    }

    *got_frame = 1;

    return avpkt->size;

}

AVCodec ff_zero12v_decoder = {

    .name           = "012v",

    .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = AV_CODEC_ID_012V,

    .init           = zero12v_decode_init,

    .decode         = zero12v_decode_frame,

    .capabilities   = CODEC_CAP_DR1,

};