libavcodec/pamenc.c

   1 /*
   2  * PAM 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 pam_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, w, n, linesize, depth, maxval, ret;
  34     const char *tuple_type;
  35     uint8_t *ptr;
  36
  37     if ((ret = ff_alloc_packet(pkt, avpicture_get_size(avctx->pix_fmt,
  38                                                        avctx->width,
  39                                                        avctx->height) + 200)) < 0) {
  40         av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
  41         return ret;
  42     }
  43
  44     *p           = *pict;
  45     p->pict_type = AV_PICTURE_TYPE_I;
  46     p->key_frame = 1;
  47
  48     s->bytestream_start =
  49     s->bytestream       = pkt->data;
  50     s->bytestream_end   = pkt->data + pkt->size;
  51
  52     h = avctx->height;
  53     w = avctx->width;
  54     switch (avctx->pix_fmt) {
  55     case AV_PIX_FMT_MONOWHITE:
  56         n          = (w + 7) >> 3;
  57         depth      = 1;
  58         maxval     = 1;
  59         tuple_type = "BLACKANDWHITE";
  60         break;
  61     case AV_PIX_FMT_GRAY8:
  62         n          = w;
  63         depth      = 1;
  64         maxval     = 255;
  65         tuple_type = "GRAYSCALE";
  66         break;
  67     case AV_PIX_FMT_RGB24:
  68         n          = w * 3;
  69         depth      = 3;
  70         maxval     = 255;
  71         tuple_type = "RGB";
  72         break;
  73     case AV_PIX_FMT_RGB32:
  74         n          = w * 4;
  75         depth      = 4;
  76         maxval     = 255;
  77         tuple_type = "RGB_ALPHA";
  78         break;
  79     default:
  80         return -1;
  81     }
  82     snprintf(s->bytestream, s->bytestream_end - s->bytestream,
  83              "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLTYPE %s\nENDHDR\n",
  84              w, h, depth, maxval, tuple_type);
  85     s->bytestream += strlen(s->bytestream);
  86
  87     ptr      = p->data[0];
  88     linesize = p->linesize[0];
  89
  90     if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
  91         int j;
  92         unsigned int v;
  93
  94         for (i = 0; i < h; i++) {
  95             for (j = 0; j < w; j++) {
  96                 v = ((uint32_t *)ptr)[j];
  97                 bytestream_put_be24(&s->bytestream, v);
  98                 *s->bytestream++ = v >> 24;
  99             }
 100             ptr += linesize;
 101         }
 102     } else {
 103         for (i = 0; i < h; i++) {
 104             memcpy(s->bytestream, ptr, n);
 105             s->bytestream += n;
 106             ptr           += linesize;
 107         }
 108     }
 109
 110     pkt->size   = s->bytestream - s->bytestream_start;
 111     pkt->flags |= AV_PKT_FLAG_KEY;
 112     *got_packet = 1;
 113     return 0;
 114 }
 115
 116
 117 AVCodec ff_pam_encoder = {
 118     .name           = "pam",
 119     .type           = AVMEDIA_TYPE_VIDEO,
 120     .id             = AV_CODEC_ID_PAM,
 121     .priv_data_size = sizeof(PNMContext),
 122     .init           = ff_pnm_init,
 123     .encode2        = pam_encode_frame,
 124     .pix_fmts       = (const enum AVPixelFormat[]){
 125         AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB32, AV_PIX_FMT_GRAY8, AV_PIX_FMT_MONOWHITE,
 126         AV_PIX_FMT_NONE
 127     },
 128     .long_name      = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
 129 };