/*
  * V210 decoder
  *
  * 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 "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,

 };