/*
  * 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"

 #include "pnm.h"
 
 

 static int pam_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                             const AVFrame *pict, int *got_packet)

 {
     PNMContext *s     = avctx->priv_data;

     AVFrame * const p = &s->picture;

     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 PIX_FMT_MONOBLACK:

         n          = w;

         depth      = 1;
         maxval     = 1;
         tuple_type = "BLACKANDWHITE";
         break;
     case PIX_FMT_GRAY8:
         n          = w;
         depth      = 1;
         maxval     = 255;
         tuple_type = "GRAYSCALE";
         break;

     case PIX_FMT_GRAY16BE:
         n          = w * 2;
         depth      = 1;
         maxval     = 0xFFFF;
         tuple_type = "GRAYSCALE";
         break;

     case PIX_FMT_GRAY8A:
         n          = w * 2;
         depth      = 2;
         maxval     = 255;
         tuple_type = "GRAYSCALE_ALPHA";
         break;

     case PIX_FMT_RGB24:
         n          = w * 3;
         depth      = 3;
         maxval     = 255;
         tuple_type = "RGB";
         break;

     case PIX_FMT_RGBA:

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

     case PIX_FMT_RGB48BE:
         n          = w * 6;
         depth      = 3;
         maxval     = 0xFFFF;
         tuple_type = "RGB";
         break;

     case 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)

         return ret;
 
     *p           = *pict;
     p->pict_type = AV_PICTURE_TYPE_I;
     p->key_frame = 1;
 
     s->bytestream_start =
     s->bytestream       = pkt->data;
     s->bytestream_end   = pkt->data + pkt->size;
 

     snprintf(s->bytestream, s->bytestream_end - s->bytestream,

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

              w, h, depth, maxval, tuple_type);
     s->bytestream += strlen(s->bytestream);
 
     ptr      = p->data[0];
     linesize = p->linesize[0];
 

     if (avctx->pix_fmt == PIX_FMT_MONOBLACK){

         int j;
         for (i = 0; i < h; i++) {
             for (j = 0; j < w; j++)
                 *s->bytestream++ = ptr[j >> 3] >> (7 - j & 7) & 1;
             ptr += linesize;
         }

     } else {
         for (i = 0; i < h; i++) {
             memcpy(s->bytestream, ptr, n);
             s->bytestream += n;
             ptr           += linesize;
         }
     }

 
     pkt->size   = s->bytestream - s->bytestream_start;
     pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;
     return 0;

 }
 
 

 AVCodec ff_pam_encoder = {

     .name           = "pam",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_PAM,
     .priv_data_size = sizeof(PNMContext),
     .init           = ff_pnm_init,

     .encode2        = pam_encode_frame,

     .pix_fmts       = (const enum PixelFormat[]){

         PIX_FMT_RGB24, PIX_FMT_RGBA, PIX_FMT_RGB48BE, PIX_FMT_RGBA64BE, PIX_FMT_GRAY8, PIX_FMT_GRAY8A, PIX_FMT_GRAY16BE, PIX_FMT_MONOBLACK, PIX_FMT_NONE

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

 };