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  1. /*
  2.  * PNM image format
  3.  * Copyright (c) 2002, 2003 Fabrice Bellard
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "libavutil/pixdesc.h"
  23. #include "avcodec.h"
  24. #include "internal.h"
  25. #include "pnm.h"
  26.  
  27.  
  28. static int pnm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  29.                             const AVFrame *p, int *got_packet)
  30. {
  31.     PNMContext *s     = avctx->priv_data;
  32.     int i, h, h1, c, n, linesize, ret;
  33.     uint8_t *ptr, *ptr1, *ptr2;
  34.  
  35.     if ((ret = ff_alloc_packet2(avctx, pkt, avpicture_get_size(avctx->pix_fmt,
  36.                                                        avctx->width,
  37.                                                        avctx->height) + 200)) < 0)
  38.         return ret;
  39.  
  40.     s->bytestream_start =
  41.     s->bytestream       = pkt->data;
  42.     s->bytestream_end   = pkt->data + pkt->size;
  43.  
  44.     h  = avctx->height;
  45.     h1 = h;
  46.     switch (avctx->pix_fmt) {
  47.     case AV_PIX_FMT_MONOWHITE:
  48.         c  = '4';
  49.         n  = (avctx->width + 7) >> 3;
  50.         break;
  51.     case AV_PIX_FMT_GRAY8:
  52.         c  = '5';
  53.         n  = avctx->width;
  54.         break;
  55.     case AV_PIX_FMT_GRAY16BE:
  56.         c  = '5';
  57.         n  = avctx->width * 2;
  58.         break;
  59.     case AV_PIX_FMT_RGB24:
  60.         c  = '6';
  61.         n  = avctx->width * 3;
  62.         break;
  63.     case AV_PIX_FMT_RGB48BE:
  64.         c  = '6';
  65.         n  = avctx->width * 6;
  66.         break;
  67.     case AV_PIX_FMT_YUV420P:
  68.         if (avctx->width & 1 || avctx->height & 1) {
  69.             av_log(avctx, AV_LOG_ERROR, "pgmyuv needs even width and height\n");
  70.             return AVERROR(EINVAL);
  71.         }
  72.         c  = '5';
  73.         n  = avctx->width;
  74.         h1 = (h * 3) / 2;
  75.         break;
  76.     case AV_PIX_FMT_YUV420P16BE:
  77.         c  = '5';
  78.         n  = avctx->width * 2;
  79.         h1 = (h * 3) / 2;
  80.         break;
  81.     default:
  82.         return -1;
  83.     }
  84.     snprintf(s->bytestream, s->bytestream_end - s->bytestream,
  85.              "P%c\n%d %d\n", c, avctx->width, h1);
  86.     s->bytestream += strlen(s->bytestream);
  87.     if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE) {
  88.         int maxdepth = (1 << (av_pix_fmt_desc_get(avctx->pix_fmt)->comp[0].depth_minus1 + 1)) - 1;
  89.         snprintf(s->bytestream, s->bytestream_end - s->bytestream,
  90.                  "%d\n", maxdepth);
  91.         s->bytestream += strlen(s->bytestream);
  92.     }
  93.  
  94.     ptr      = p->data[0];
  95.     linesize = p->linesize[0];
  96.     for (i = 0; i < h; i++) {
  97.         memcpy(s->bytestream, ptr, n);
  98.         s->bytestream += n;
  99.         ptr           += linesize;
  100.     }
  101.  
  102.     if (avctx->pix_fmt == AV_PIX_FMT_YUV420P || avctx->pix_fmt == AV_PIX_FMT_YUV420P16BE) {
  103.         h >>= 1;
  104.         n >>= 1;
  105.         ptr1 = p->data[1];
  106.         ptr2 = p->data[2];
  107.         for (i = 0; i < h; i++) {
  108.             memcpy(s->bytestream, ptr1, n);
  109.             s->bytestream += n;
  110.             memcpy(s->bytestream, ptr2, n);
  111.             s->bytestream += n;
  112.                 ptr1 += p->linesize[1];
  113.                 ptr2 += p->linesize[2];
  114.         }
  115.     }
  116.     pkt->size   = s->bytestream - s->bytestream_start;
  117.     pkt->flags |= AV_PKT_FLAG_KEY;
  118.     *got_packet = 1;
  119.  
  120.     return 0;
  121. }
  122.  
  123.  
  124. #if CONFIG_PGM_ENCODER
  125. AVCodec ff_pgm_encoder = {
  126.     .name           = "pgm",
  127.     .long_name      = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
  128.     .type           = AVMEDIA_TYPE_VIDEO,
  129.     .id             = AV_CODEC_ID_PGM,
  130.     .priv_data_size = sizeof(PNMContext),
  131.     .encode2        = pnm_encode_frame,
  132.     .pix_fmts       = (const enum AVPixelFormat[]){
  133.         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_NONE
  134.     },
  135. };
  136. #endif
  137.  
  138. #if CONFIG_PGMYUV_ENCODER
  139. AVCodec ff_pgmyuv_encoder = {
  140.     .name           = "pgmyuv",
  141.     .long_name      = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
  142.     .type           = AVMEDIA_TYPE_VIDEO,
  143.     .id             = AV_CODEC_ID_PGMYUV,
  144.     .priv_data_size = sizeof(PNMContext),
  145.     .encode2        = pnm_encode_frame,
  146.     .pix_fmts       = (const enum AVPixelFormat[]){
  147.         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P16BE, AV_PIX_FMT_NONE
  148.     },
  149. };
  150. #endif
  151.  
  152. #if CONFIG_PPM_ENCODER
  153. AVCodec ff_ppm_encoder = {
  154.     .name           = "ppm",
  155.     .long_name      = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
  156.     .type           = AVMEDIA_TYPE_VIDEO,
  157.     .id             = AV_CODEC_ID_PPM,
  158.     .priv_data_size = sizeof(PNMContext),
  159.     .encode2        = pnm_encode_frame,
  160.     .pix_fmts       = (const enum AVPixelFormat[]){
  161.         AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB48BE, AV_PIX_FMT_NONE
  162.     },
  163. };
  164. #endif
  165.  
  166. #if CONFIG_PBM_ENCODER
  167. AVCodec ff_pbm_encoder = {
  168.     .name           = "pbm",
  169.     .long_name      = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
  170.     .type           = AVMEDIA_TYPE_VIDEO,
  171.     .id             = AV_CODEC_ID_PBM,
  172.     .priv_data_size = sizeof(PNMContext),
  173.     .encode2        = pnm_encode_frame,
  174.     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_MONOWHITE,
  175.                                                   AV_PIX_FMT_NONE },
  176. };
  177. #endif
  178.