/*
  * Copyright (c) 2011 Derek Buitenhuis
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
  * License as published by the Free Software Foundation;
  * version 2 of the License.
  *
  * 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
  * General Public License for more details.
  *
  * You should have received a copy of the GNU 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
  */
 
 /**
  * @file
  * Known FOURCCs:

  *     'ULY0' (YCbCr 4:2:0), 'ULY2' (YCbCr 4:2:2), 'ULRG' (RGB), 'ULRA' (RGBA),
  *     'ULH0' (YCbCr 4:2:0 BT.709), 'ULH2' (YCbCr 4:2:2 BT.709)

  */
 
 extern "C" {
 #include "avcodec.h"
 }
 

 #include "libutvideo.h"

 #include "get_bits.h"
 
 static av_cold int utvideo_decode_init(AVCodecContext *avctx)
 {
     UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
     UtVideoExtra info;

     int format;

     int begin_ret;

     if (avctx->extradata_size != 4*4) {

         av_log(avctx, AV_LOG_ERROR, "Extradata size mismatch.\n");
         return -1;
     }
 
     /* Read extradata */
     info.version = AV_RL32(avctx->extradata);
     info.original_format = AV_RL32(avctx->extradata + 4);

     info.frameinfo_size = AV_RL32(avctx->extradata + 8);

     info.flags = AV_RL32(avctx->extradata + 12);
 

     /* Pick format based on FOURCC */

     switch (avctx->codec_tag) {

 #ifdef UTV_BT709
     case MKTAG('U', 'L', 'H', '0'):
         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
         avctx->colorspace = AVCOL_SPC_BT709;
         format = UTVF_YV12;
         break;
     case MKTAG('U', 'L', 'H', '2'):
         avctx->pix_fmt = AV_PIX_FMT_YUYV422;
         avctx->colorspace = AVCOL_SPC_BT709;
         format = UTVF_YUY2;
         break;
 #endif

     case MKTAG('U', 'L', 'Y', '0'):

         avctx->pix_fmt = AV_PIX_FMT_YUV420P;

         format = UTVF_YV12;
         break;
     case MKTAG('U', 'L', 'Y', '2'):

         avctx->pix_fmt = AV_PIX_FMT_YUYV422;

         format = UTVF_YUY2;
         break;
     case MKTAG('U', 'L', 'R', 'G'):

         avctx->pix_fmt = AV_PIX_FMT_BGR24;

         format = UTVF_NFCC_BGR_BU;

         break;
     case MKTAG('U', 'L', 'R', 'A'):

         avctx->pix_fmt = AV_PIX_FMT_RGB32;

         format = UTVF_NFCC_BGRA_BU;

         break;
     default:
         av_log(avctx, AV_LOG_ERROR,
               "Not a Ut Video FOURCC: %X\n", avctx->codec_tag);
         return -1;

     }
 
     /* Only allocate the buffer once */

     utv->buf_size = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);

     utv->buffer = (uint8_t *)av_malloc(utv->buf_size * sizeof(uint8_t));

     if (utv->buffer == NULL) {

         av_log(avctx, AV_LOG_ERROR, "Unable to allocate output buffer.\n");
         return -1;
     }
 

     /* Allocate the output frame */

     avctx->coded_frame = avcodec_alloc_frame();
 
     /* Ut Video only supports 8-bit */
     avctx->bits_per_raw_sample = 8;
 
     /* Is it interlaced? */
     avctx->coded_frame->interlaced_frame = info.flags & 0x800 ? 1 : 0;
 
     /* Apparently Ut Video doesn't store this info... */
     avctx->coded_frame->top_field_first = 1;
 
     /*
      * Create a Ut Video instance. Since the function wants
      * an "interface name" string, pass it the name of the lib.
      */
     utv->codec = CCodec::CreateInstance(UNFCC(avctx->codec_tag), "libavcodec");
 
     /* Initialize Decoding */

     begin_ret = utv->codec->DecodeBegin(format, avctx->width, avctx->height,

                             CBGROSSWIDTH_WINDOWS, &info, sizeof(UtVideoExtra));

     /* Check to see if the decoder initlized properly */

     if (begin_ret != 0) {

         av_log(avctx, AV_LOG_ERROR,
                "Could not initialize decoder: %d\n", begin_ret);
         return -1;
     }
 

     return 0;
 }
 
 static int utvideo_decode_frame(AVCodecContext *avctx, void *data,

                                 int *got_frame, AVPacket *avpkt)

 {
     UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
     AVFrame *pic = avctx->coded_frame;

     int w = avctx->width, h = avctx->height;

 
     /* Set flags */
     pic->reference = 0;
     pic->pict_type = AV_PICTURE_TYPE_I;
     pic->key_frame = 1;
 
     /* Decode the frame */

     utv->codec->DecodeFrame(utv->buffer, avpkt->data, true);

 
     /* Set the output data depending on the colorspace */

     switch (avctx->pix_fmt) {

     case AV_PIX_FMT_YUV420P:

         pic->linesize[0] = w;
         pic->linesize[1] = pic->linesize[2] = w / 2;

         pic->data[0] = utv->buffer;
         pic->data[2] = utv->buffer + (w * h);

         pic->data[1] = pic->data[2] + (w * h / 4);
         break;

     case AV_PIX_FMT_YUYV422:

         pic->linesize[0] = w * 2;

         pic->data[0] = utv->buffer;

         break;

     case AV_PIX_FMT_BGR24:
     case AV_PIX_FMT_RGB32:

         /* Make the linesize negative, since Ut Video uses bottom-up BGR */

         pic->linesize[0] = -1 * w * (avctx->pix_fmt == AV_PIX_FMT_BGR24 ? 3 : 4);

         pic->data[0] = utv->buffer + utv->buf_size + pic->linesize[0];

         break;
     }

     *got_frame = 1;

     av_frame_move_ref((AVFrame*)data, pic);

 
     return avpkt->size;
 }
 
 static av_cold int utvideo_decode_close(AVCodecContext *avctx)
 {
     UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
 
     /* Free output */
     av_freep(&avctx->coded_frame);

     av_freep(&utv->buffer);

 
     /* Finish decoding and clean up the instance */
     utv->codec->DecodeEnd();
     CCodec::DeleteInstance(utv->codec);
 
     return 0;
 }
 
 AVCodec ff_libutvideo_decoder = {

     "libutvideo",

     NULL_IF_CONFIG_SMALL("Ut Video"),

     AVMEDIA_TYPE_VIDEO,

     AV_CODEC_ID_UTVIDEO,

     0,    //capabilities
     NULL, //supported_framerates
     NULL, //pix_fmts
     NULL, //supported_samplerates
     NULL, //sample_fmts
     NULL, //channel_layouts
     0,    //max_lowres
     NULL, //priv_class
     NULL, //profiles

     sizeof(UtVideoContext),

     NULL, //next
     NULL, //init_thread_copy
     NULL, //update_thread_context
     NULL, //defaults
     NULL, //init_static_data

     utvideo_decode_init,

     NULL, //encode
     NULL, //encode2

     utvideo_decode_frame,

     utvideo_decode_close,

 };