/*
  * PAM image format
  * Copyright (c) 2002, 2003 Fabrice Bellard
  *
  * 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"

 static int pam_encode_frame(AVCodecContext *avctx, AVPacket *pkt,

                             const AVFrame *p, int *got_packet)

 {

     uint8_t *bytestream_start, *bytestream, *bytestream_end;

     int i, h, w, n, linesize, depth, maxval, ret;

     const char *tuple_type;
     uint8_t *ptr;
 
     h = avctx->height;
     w = avctx->width;
     switch (avctx->pix_fmt) {

     case AV_PIX_FMT_MONOBLACK:

         n          = w;

         depth      = 1;
         maxval     = 1;
         tuple_type = "BLACKANDWHITE";
         break;

     case AV_PIX_FMT_GRAY8:

         n          = w;
         depth      = 1;
         maxval     = 255;
         tuple_type = "GRAYSCALE";
         break;

     case AV_PIX_FMT_GRAY16BE:

         n          = w * 2;
         depth      = 1;
         maxval     = 0xFFFF;
         tuple_type = "GRAYSCALE";
         break;

     case AV_PIX_FMT_GRAY8A:

         n          = w * 2;
         depth      = 2;
         maxval     = 255;
         tuple_type = "GRAYSCALE_ALPHA";
         break;

     case AV_PIX_FMT_YA16BE:
         n          = w * 4;
         depth      = 2;
         maxval     = 0xFFFF;
         tuple_type = "GRAYSCALE_ALPHA";
         break;

     case AV_PIX_FMT_RGB24:

         n          = w * 3;
         depth      = 3;
         maxval     = 255;
         tuple_type = "RGB";
         break;

     case AV_PIX_FMT_RGBA:

         n          = w * 4;
         depth      = 4;
         maxval     = 255;
         tuple_type = "RGB_ALPHA";
         break;

     case AV_PIX_FMT_RGB48BE:

         n          = w * 6;
         depth      = 3;
         maxval     = 0xFFFF;
         tuple_type = "RGB";
         break;

     case AV_PIX_FMT_RGBA64BE:

         n          = w * 8;
         depth      = 4;
         maxval     = 0xFFFF;
         tuple_type = "RGB_ALPHA";
         break;

     default:
         return -1;
     }

     if ((ret = ff_alloc_packet2(avctx, pkt, n*h + 200, 0)) < 0)

         return ret;
 

     bytestream_start =
     bytestream       = pkt->data;
     bytestream_end   = pkt->data + pkt->size;

     snprintf(bytestream, bytestream_end - bytestream,

              "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLTYPE %s\nENDHDR\n",

              w, h, depth, maxval, tuple_type);

     bytestream += strlen(bytestream);

 
     ptr      = p->data[0];
     linesize = p->linesize[0];
 

     if (avctx->pix_fmt == AV_PIX_FMT_MONOBLACK){

         int j;
         for (i = 0; i < h; i++) {
             for (j = 0; j < w; j++)

                 *bytestream++ = ptr[j >> 3] >> (7 - j & 7) & 1;

             ptr += linesize;
         }

     } else {
         for (i = 0; i < h; i++) {

             memcpy(bytestream, ptr, n);
             bytestream += n;
             ptr        += linesize;

         }
     }

     pkt->size   = bytestream - bytestream_start;

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

 }
 

 static av_cold int pam_encode_init(AVCodecContext *avctx)
 {

 #if FF_API_CODED_FRAME
 FF_DISABLE_DEPRECATION_WARNINGS

     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
     avctx->coded_frame->key_frame = 1;

 FF_ENABLE_DEPRECATION_WARNINGS
 #endif

 
     return 0;
 }
 

 AVCodec ff_pam_encoder = {

     .name           = "pam",

     .long_name      = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_PAM,

     .init           = pam_encode_init,

     .encode2        = pam_encode_frame,

     .pix_fmts       = (const enum AVPixelFormat[]){

         AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
         AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGBA64BE,
         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY8A,
         AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_YA16BE,
         AV_PIX_FMT_MONOBLACK, AV_PIX_FMT_NONE

     },

 };