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/*

 * V210 decoder

 *

 * Copyright (C) 2009 Michael Niedermayer 

 * Copyright (c) 2009 Baptiste Coudurier 

 *

 * 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 "v210dec.h"

#include "libavutil/bswap.h"

#include "libavutil/internal.h"

#include "libavutil/mem.h"

#define READ_PIXELS(a, b, c)         \

    do {                             \

        val  = av_le2ne32(*src++);   \

        *a++ =  val & 0x3FF;         \

        *b++ = (val >> 10) & 0x3FF;  \

        *c++ = (val >> 20) & 0x3FF;  \

    } while (0)

static void v210_planar_unpack_c(const uint32_t *src, uint16_t *y, uint16_t *u, uint16_t *v, int width)

{

    uint32_t val;

    int i;

    for( i = 0; i < width-5; i += 6 ){

        READ_PIXELS(u, y, v);

        READ_PIXELS(y, u, y);

        READ_PIXELS(v, y, u);

        READ_PIXELS(y, v, y);

    }

}

static av_cold int decode_init(AVCodecContext *avctx)

{

    V210DecContext *s = avctx->priv_data;

    if (avctx->width & 1) {

        av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");

        return AVERROR_INVALIDDATA;

    }

    avctx->pix_fmt             = AV_PIX_FMT_YUV422P10;

    avctx->bits_per_raw_sample = 10;

    s->unpack_frame            = v210_planar_unpack_c;

    if (HAVE_MMX)

        v210_x86_init(s);

    return 0;

}

static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

                        AVPacket *avpkt)

{

    V210DecContext *s = avctx->priv_data;

    int h, w, ret, stride, aligned_input;

    AVFrame *pic = data;

    const uint8_t *psrc = avpkt->data;

    uint16_t *y, *u, *v;

    if (s->custom_stride )

        stride = s->custom_stride;

    else {

        int aligned_width = ((avctx->width + 47) / 48) * 48;

        stride = aligned_width * 8 / 3;

    }

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

        if ((((avctx->width + 23) / 24) * 24 * 8) / 3 * avctx->height == avpkt->size) {

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

            if (!s->stride_warning_shown)

                av_log(avctx, AV_LOG_WARNING, "Broken v210 with too small padding (64 byte) detected\n");

            s->stride_warning_shown = 1;

        } else {

            av_log(avctx, AV_LOG_ERROR, "packet too small\n");

            return AVERROR_INVALIDDATA;

        }

    }

    aligned_input = !((uintptr_t)psrc & 0xf) && !(stride & 0xf);

    if (aligned_input != s->aligned_input) {

        s->aligned_input = aligned_input;

        if (HAVE_MMX)

            v210_x86_init(s);

    }

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

        return ret;

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

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

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

    pic->pict_type = AV_PICTURE_TYPE_I;

    pic->key_frame = 1;

    for (h = 0; h < avctx->height; h++) {

        const uint32_t *src = (const uint32_t*)psrc;

        uint32_t val;

        w = (avctx->width / 6) * 6;

        s->unpack_frame(src, y, u, v, w);

        y += w;

        u += w >> 1;

        v += w >> 1;

        src += (w << 1) / 3;

        if (w < avctx->width - 1) {

            READ_PIXELS(u, y, v);

            val  = av_le2ne32(*src++);

            *y++ =  val & 0x3FF;

            if (w < avctx->width - 3) {

                *u++ = (val >> 10) & 0x3FF;

                *y++ = (val >> 20) & 0x3FF;

                val  = av_le2ne32(*src++);

                *v++ =  val & 0x3FF;

                *y++ = (val >> 10) & 0x3FF;

            }

        }

        psrc += stride;

        y += pic->linesize[0] / 2 - avctx->width;

        u += pic->linesize[1] / 2 - avctx->width / 2;

        v += pic->linesize[2] / 2 - avctx->width / 2;

    }

    if (avctx->field_order > AV_FIELD_PROGRESSIVE) {

        /* we have interlaced material flagged in container */

        pic->interlaced_frame = 1;

        if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)

            pic->top_field_first = 1;

    }

    *got_frame      = 1;

    return avpkt->size;

}

#define V210DEC_FLAGS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM

static const AVOption v210dec_options[] = {

    {"custom_stride", "Custom V210 stride", offsetof(V210DecContext, custom_stride), FF_OPT_TYPE_INT,

     {.i64 = 0}, INT_MIN, INT_MAX, V210DEC_FLAGS},

    {NULL}

};

static const AVClass v210dec_class = {

    "V210 Decoder",

    av_default_item_name,

    v210dec_options,

    LIBAVUTIL_VERSION_INT,

};

AVCodec ff_v210_decoder = {

    .name           = "v210",

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

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = AV_CODEC_ID_V210,

    .priv_data_size = sizeof(V210DecContext),

    .init           = decode_init,

    .decode         = decode_frame,

    .capabilities   = CODEC_CAP_DR1,

    .priv_class     = &v210dec_class,

};