libavcodec/pnmenc.c

   1 /*
   2  * PNM image format
   3  * Copyright (c) 2002, 2003 Fabrice Bellard
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "avcodec.h"
  23 #include "bytestream.h"
  24 #include "internal.h"
  25 #include "pnm.h"
  26
  27
  28 static int pnm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  29                             const AVFrame *pict, int *got_packet)
  30 {
  31     PNMContext *s     = avctx->priv_data;
  32     AVFrame * const p = &s->picture;
  33     int i, h, h1, c, n, linesize, ret;
  34     uint8_t *ptr, *ptr1, *ptr2;
  35
  36     if ((ret = ff_alloc_packet(pkt, avpicture_get_size(avctx->pix_fmt,
  37                                                        avctx->width,
  38                                                        avctx->height) + 200)) < 0) {
  39         av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
  40         return ret;
  41     }
  42
  43     *p           = *pict;
  44     p->pict_type = AV_PICTURE_TYPE_I;
  45     p->key_frame = 1;
  46
  47     s->bytestream_start =
  48     s->bytestream       = pkt->data;
  49     s->bytestream_end   = pkt->data + pkt->size;
  50
  51     h  = avctx->height;
  52     h1 = h;
  53     switch (avctx->pix_fmt) {
  54     case AV_PIX_FMT_MONOWHITE:
  55         c  = '4';
  56         n  = (avctx->width + 7) >> 3;
  57         break;
  58     case AV_PIX_FMT_GRAY8:
  59         c  = '5';
  60         n  = avctx->width;
  61         break;
  62     case AV_PIX_FMT_GRAY16BE:
  63         c  = '5';
  64         n  = avctx->width * 2;
  65         break;
  66     case AV_PIX_FMT_RGB24:
  67         c  = '6';
  68         n  = avctx->width * 3;
  69         break;
  70     case AV_PIX_FMT_RGB48BE:
  71         c  = '6';
  72         n  = avctx->width * 6;
  73         break;
  74     case AV_PIX_FMT_YUV420P:
  75         c  = '5';
  76         n  = avctx->width;
  77         h1 = (h * 3) / 2;
  78         break;
  79     default:
  80         return -1;
  81     }
  82     snprintf(s->bytestream, s->bytestream_end - s->bytestream,
  83              "P%c\n%d %d\n", c, avctx->width, h1);
  84     s->bytestream += strlen(s->bytestream);
  85     if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE) {
  86         snprintf(s->bytestream, s->bytestream_end - s->bytestream,
  87                  "%d\n", (avctx->pix_fmt != AV_PIX_FMT_GRAY16BE && avctx->pix_fmt != AV_PIX_FMT_RGB48BE) ? 255 : 65535);
  88         s->bytestream += strlen(s->bytestream);
  89     }
  90
  91     ptr      = p->data[0];
  92     linesize = p->linesize[0];
  93     for (i = 0; i < h; i++) {
  94         memcpy(s->bytestream, ptr, n);
  95         s->bytestream += n;
  96         ptr           += linesize;
  97     }
  98
  99     if (avctx->pix_fmt == AV_PIX_FMT_YUV420P) {
 100         h >>= 1;
 101         n >>= 1;
 102         ptr1 = p->data[1];
 103         ptr2 = p->data[2];
 104         for (i = 0; i < h; i++) {
 105             memcpy(s->bytestream, ptr1, n);
 106             s->bytestream += n;
 107             memcpy(s->bytestream, ptr2, n);
 108             s->bytestream += n;
 109                 ptr1 += p->linesize[1];
 110                 ptr2 += p->linesize[2];
 111         }
 112     }
 113     pkt->size   = s->bytestream - s->bytestream_start;
 114     pkt->flags |= AV_PKT_FLAG_KEY;
 115     *got_packet = 1;
 116
 117     return 0;
 118 }
 119
 120
 121 #if CONFIG_PGM_ENCODER
 122 AVCodec ff_pgm_encoder = {
 123     .name           = "pgm",
 124     .type           = AVMEDIA_TYPE_VIDEO,
 125     .id             = AV_CODEC_ID_PGM,
 126     .priv_data_size = sizeof(PNMContext),
 127     .init           = ff_pnm_init,
 128     .encode2        = pnm_encode_frame,
 129     .pix_fmts       = (const enum AVPixelFormat[]){
 130         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_NONE
 131     },
 132     .long_name      = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
 133 };
 134 #endif
 135
 136 #if CONFIG_PGMYUV_ENCODER
 137 AVCodec ff_pgmyuv_encoder = {
 138     .name           = "pgmyuv",
 139     .type           = AVMEDIA_TYPE_VIDEO,
 140     .id             = AV_CODEC_ID_PGMYUV,
 141     .priv_data_size = sizeof(PNMContext),
 142     .init           = ff_pnm_init,
 143     .encode2        = pnm_encode_frame,
 144     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
 145     .long_name      = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
 146 };
 147 #endif
 148
 149 #if CONFIG_PPM_ENCODER
 150 AVCodec ff_ppm_encoder = {
 151     .name           = "ppm",
 152     .type           = AVMEDIA_TYPE_VIDEO,
 153     .id             = AV_CODEC_ID_PPM,
 154     .priv_data_size = sizeof(PNMContext),
 155     .init           = ff_pnm_init,
 156     .encode2        = pnm_encode_frame,
 157     .pix_fmts       = (const enum AVPixelFormat[]){
 158         AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB48BE, AV_PIX_FMT_NONE
 159     },
 160     .long_name      = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
 161 };
 162 #endif
 163
 164 #if CONFIG_PBM_ENCODER
 165 AVCodec ff_pbm_encoder = {
 166     .name           = "pbm",
 167     .type           = AVMEDIA_TYPE_VIDEO,
 168     .id             = AV_CODEC_ID_PBM,
 169     .priv_data_size = sizeof(PNMContext),
 170     .init           = ff_pnm_init,
 171     .encode2        = pnm_encode_frame,
 172     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_MONOWHITE,
 173                                                   AV_PIX_FMT_NONE },
 174     .long_name      = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
 175 };
 176 #endif