/*
  * V210 encoder
  *
  * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
  * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
  *
  * 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 "bytestream.h"

 #include "internal.h"

 
 static av_cold int encode_init(AVCodecContext *avctx)
 {
     if (avctx->width & 1) {
         av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");

         return AVERROR(EINVAL);

     }
 
     if (avctx->bits_per_raw_sample != 10)
         av_log(avctx, AV_LOG_WARNING, "bits per raw sample: %d != 10-bit\n",
                avctx->bits_per_raw_sample);
 

     avctx->coded_frame = av_frame_alloc();

     if (!avctx->coded_frame)
         return AVERROR(ENOMEM);

     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;

 
     return 0;
 }
 

 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                         const AVFrame *pic, int *got_packet)

 {
     int aligned_width = ((avctx->width + 47) / 48) * 48;
     int stride = aligned_width * 8 / 3;

     int line_padding = stride - ((avctx->width * 8 + 11) / 12) * 4;

     int h, w, ret;

     const uint16_t *y = (const uint16_t*)pic->data[0];
     const uint16_t *u = (const uint16_t*)pic->data[1];
     const uint16_t *v = (const uint16_t*)pic->data[2];

     PutByteContext p;

     if ((ret = ff_alloc_packet2(avctx, pkt, avctx->height * stride)) < 0)

         return ret;

     bytestream2_init_writer(&p, pkt->data, pkt->size);

 #define CLIP(v) av_clip(v, 4, 1019)
 

 #define WRITE_PIXELS(a, b, c)           \
     do {                                \

         val =   CLIP(*a++);             \
         val |= (CLIP(*b++) << 10) |     \
                (CLIP(*c++) << 20);      \

         bytestream2_put_le32u(&p, val); \

     } while (0)

 
     for (h = 0; h < avctx->height; h++) {
         uint32_t val;
         for (w = 0; w < avctx->width - 5; w += 6) {
             WRITE_PIXELS(u, y, v);
             WRITE_PIXELS(y, u, y);
             WRITE_PIXELS(v, y, u);
             WRITE_PIXELS(y, v, y);
         }
         if (w < avctx->width - 1) {
             WRITE_PIXELS(u, y, v);
 

             val = CLIP(*y++);

             if (w == avctx->width - 2)

                 bytestream2_put_le32u(&p, val);

             if (w < avctx->width - 3) {
                 val |= (CLIP(*u++) << 10) | (CLIP(*y++) << 20);

                 bytestream2_put_le32u(&p, val);

                 val = CLIP(*v++) | (CLIP(*y++) << 10);

                 bytestream2_put_le32u(&p, val);

             }

         }
 

         bytestream2_set_buffer(&p, 0, line_padding);
 

         y += pic->linesize[0] / 2 - avctx->width;
         u += pic->linesize[1] / 2 - avctx->width / 2;
         v += pic->linesize[2] / 2 - avctx->width / 2;

     }
 

     pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;
     return 0;

 }
 
 static av_cold int encode_close(AVCodecContext *avctx)
 {
     av_freep(&avctx->coded_frame);
 
     return 0;
 }
 

 AVCodec ff_v210_encoder = {

     .name           = "v210",

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

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_V210,

     .init           = encode_init,

     .encode2        = encode_frame,

     .close          = encode_close,

     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV422P10, AV_PIX_FMT_NONE },

 };