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 "libavutil/imgutils.h"
  23
  24 #include "avcodec.h"
  25 #include "bytestream.h"
  26 #include "internal.h"
  27
  28 static int pam_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  29                             const AVFrame *pict, int *got_packet)
  30 {
  31     uint8_t *bytestream_start, *bytestream, *bytestream_end;
  32     const AVFrame * const p = pict;
  33     int i, h, w, n, linesize, depth, maxval, ret;
  34     const char *tuple_type;
  35     uint8_t *ptr;
  36     int size = av_image_get_buffer_size(avctx->pix_fmt,
  37                                         avctx->width, avctx->height, 1);
  38
  39     if ((ret = ff_alloc_packet(pkt, size + 200)) < 0) {
  40         av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
  41         return ret;
  42     }
  43
  44     bytestream_start =
  45     bytestream       = pkt->data;
  46     bytestream_end   = pkt->data + pkt->size;
  47
  48     h = avctx->height;
  49     w = avctx->width;
  50     switch (avctx->pix_fmt) {
  51     case AV_PIX_FMT_MONOWHITE:
  52         n          = (w + 7) >> 3;
  53         depth      = 1;
  54         maxval     = 1;
  55         tuple_type = "BLACKANDWHITE";
  56         break;
  57     case AV_PIX_FMT_GRAY8:
  58         n          = w;
  59         depth      = 1;
  60         maxval     = 255;
  61         tuple_type = "GRAYSCALE";
  62         break;
  63     case AV_PIX_FMT_RGB24:
  64         n          = w * 3;
  65         depth      = 3;
  66         maxval     = 255;
  67         tuple_type = "RGB";
  68         break;
  69     case AV_PIX_FMT_RGB32:
  70         n          = w * 4;
  71         depth      = 4;
  72         maxval     = 255;
  73         tuple_type = "RGB_ALPHA";
  74         break;
  75     default:
  76         return -1;
  77     }
  78     snprintf(bytestream, bytestream_end - bytestream,
  79              "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLTYPE %s\nENDHDR\n",
  80              w, h, depth, maxval, tuple_type);
  81     bytestream += strlen(bytestream);
  82
  83     ptr      = p->data[0];
  84     linesize = p->linesize[0];
  85
  86     if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
  87         int j;
  88         unsigned int v;
  89
  90         for (i = 0; i < h; i++) {
  91             for (j = 0; j < w; j++) {
  92                 v = ((uint32_t *)ptr)[j];
  93                 bytestream_put_be24(&bytestream, v);
  94                 *bytestream++ = v >> 24;
  95             }
  96             ptr += linesize;
  97         }
  98     } else {
  99         for (i = 0; i < h; i++) {
 100             memcpy(bytestream, ptr, n);
 101             bytestream += n;
 102             ptr        += linesize;
 103         }
 104     }
 105
 106     pkt->size   = bytestream - bytestream_start;
 107     pkt->flags |= AV_PKT_FLAG_KEY;
 108     *got_packet = 1;
 109     return 0;
 110 }
 111
 112 static av_cold int pam_encode_init(AVCodecContext *avctx)
 113 {
 114 #if FF_API_CODED_FRAME
 115 FF_DISABLE_DEPRECATION_WARNINGS
 116     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
 117     avctx->coded_frame->key_frame = 1;
 118 FF_ENABLE_DEPRECATION_WARNINGS
 119 #endif
 120
 121     return 0;
 122 }
 123
 124 AVCodec ff_pam_encoder = {
 125     .name           = "pam",
 126     .long_name      = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
 127     .type           = AVMEDIA_TYPE_VIDEO,
 128     .id             = AV_CODEC_ID_PAM,
 129     .init           = pam_encode_init,
 130     .encode2        = pam_encode_frame,
 131     .pix_fmts       = (const enum AVPixelFormat[]){
 132         AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB32, AV_PIX_FMT_GRAY8, AV_PIX_FMT_MONOWHITE,
 133         AV_PIX_FMT_NONE
 134     },
 135 };