/*
  * PNM 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 "bytestream.h"

 #include "pnm.h"
 
 

 static int pnm_encode_frame(AVCodecContext *avctx, unsigned char *outbuf,
                             int buf_size, void *data)
 {
     PNMContext *s     = avctx->priv_data;
     AVFrame *pict     = data;
     AVFrame * const p = (AVFrame*)&s->picture;

     int i, h, h1, c, n, linesize;
     uint8_t *ptr, *ptr1, *ptr2;
 

     if (buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200) {

         av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
         return -1;
     }
 

     *p           = *pict;

     p->pict_type = AV_PICTURE_TYPE_I;

     p->key_frame = 1;

     s->bytestream_start =
     s->bytestream       = outbuf;
     s->bytestream_end   = outbuf + buf_size;

     h  = avctx->height;

     h1 = h;

     switch (avctx->pix_fmt) {

     case PIX_FMT_MONOWHITE:

         c  = '4';
         n  = (avctx->width + 7) >> 3;

         break;
     case PIX_FMT_GRAY8:

         c  = '5';
         n  = avctx->width;

         break;
     case PIX_FMT_GRAY16BE:

         c  = '5';
         n  = avctx->width * 2;

         break;
     case PIX_FMT_RGB24:

         c  = '6';
         n  = avctx->width * 3;

         break;

     case PIX_FMT_RGB48BE:

         c  = '6';
         n  = avctx->width * 6;

         break;

     case PIX_FMT_YUV420P:

         c  = '5';
         n  = avctx->width;

         h1 = (h * 3) / 2;
         break;
     default:
         return -1;
     }
     snprintf(s->bytestream, s->bytestream_end - s->bytestream,

              "P%c\n%d %d\n", c, avctx->width, h1);

     s->bytestream += strlen(s->bytestream);
     if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
         snprintf(s->bytestream, s->bytestream_end - s->bytestream,

                  "%d\n", (avctx->pix_fmt != PIX_FMT_GRAY16BE && avctx->pix_fmt != PIX_FMT_RGB48BE) ? 255 : 65535);

         s->bytestream += strlen(s->bytestream);
     }
 

     ptr      = p->data[0];

     linesize = p->linesize[0];

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

         memcpy(s->bytestream, ptr, n);
         s->bytestream += n;

         ptr           += linesize;

     }
 
     if (avctx->pix_fmt == PIX_FMT_YUV420P) {
         h >>= 1;
         n >>= 1;
         ptr1 = p->data[1];
         ptr2 = p->data[2];

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

             memcpy(s->bytestream, ptr1, n);
             s->bytestream += n;
             memcpy(s->bytestream, ptr2, n);
             s->bytestream += n;
                 ptr1 += p->linesize[1];
                 ptr2 += p->linesize[2];
         }
     }
     return s->bytestream - s->bytestream_start;
 }
 
 

 #if CONFIG_PGM_ENCODER

 AVCodec ff_pgm_encoder = {

     .name           = "pgm",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_PGM,
     .priv_data_size = sizeof(PNMContext),
     .init           = ff_pnm_init,
     .encode         = pnm_encode_frame,

     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, PIX_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),

 };

 #endif

 #if CONFIG_PGMYUV_ENCODER

 AVCodec ff_pgmyuv_encoder = {

     .name           = "pgmyuv",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_PGMYUV,
     .priv_data_size = sizeof(PNMContext),
     .init           = ff_pnm_init,
     .encode         = pnm_encode_frame,

     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),

 };

 #endif

 #if CONFIG_PPM_ENCODER

 AVCodec ff_ppm_encoder = {

     .name           = "ppm",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_PPM,
     .priv_data_size = sizeof(PNMContext),
     .init           = ff_pnm_init,
     .encode         = pnm_encode_frame,

     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB48BE, PIX_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),

 };

 #endif

 #if CONFIG_PBM_ENCODER

 AVCodec ff_pbm_encoder = {

     .name           = "pbm",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_PBM,
     .priv_data_size = sizeof(PNMContext),
     .init           = ff_pnm_init,
     .encode         = pnm_encode_frame,

     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_MONOWHITE, PIX_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),

 };

 #endif