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 "libavutil/pixdesc.h"
  23 #include "avcodec.h"
  24 #include "bytestream.h"
  25 #include "internal.h"
  26 #include "pnm.h"
  27
  28
  29 static int pnm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  30                             const AVFrame *pict, int *got_packet)
  31 {
  32     PNMContext *s     = avctx->priv_data;
  33     AVFrame * const p = &s->picture;
  34     int i, h, h1, c, n, linesize, ret;
  35     uint8_t *ptr, *ptr1, *ptr2;
  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     h1 = h;
  54     switch (avctx->pix_fmt) {
  55     case AV_PIX_FMT_MONOWHITE:
  56         c  = '4';
  57         n  = (avctx->width + 7) >> 3;
  58         break;
  59     case AV_PIX_FMT_GRAY8:
  60         c  = '5';
  61         n  = avctx->width;
  62         break;
  63     case AV_PIX_FMT_GRAY16BE:
  64         c  = '5';
  65         n  = avctx->width * 2;
  66         break;
  67     case AV_PIX_FMT_RGB24:
  68         c  = '6';
  69         n  = avctx->width * 3;
  70         break;
  71     case AV_PIX_FMT_RGB48BE:
  72         c  = '6';
  73         n  = avctx->width * 6;
  74         break;
  75     case AV_PIX_FMT_YUV420P:
  76         c  = '5';
  77         n  = avctx->width;
  78         h1 = (h * 3) / 2;
  79         break;
  80     case AV_PIX_FMT_YUV420P16BE:
  81         c  = '5';
  82         n  = avctx->width * 2;
  83         h1 = (h * 3) / 2;
  84         break;
  85     default:
  86         return -1;
  87     }
  88     snprintf(s->bytestream, s->bytestream_end - s->bytestream,
  89              "P%c\n%d %d\n", c, avctx->width, h1);
  90     s->bytestream += strlen(s->bytestream);
  91     if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE) {
  92         int maxdepth = (1 << (av_pix_fmt_desc_get(avctx->pix_fmt)->comp[0].depth_minus1 + 1)) - 1;
  93         snprintf(s->bytestream, s->bytestream_end - s->bytestream,
  94                  "%d\n", maxdepth);
  95         s->bytestream += strlen(s->bytestream);
  96     }
  97
  98     ptr      = p->data[0];
  99     linesize = p->linesize[0];
 100     for (i = 0; i < h; i++) {
 101         memcpy(s->bytestream, ptr, n);
 102         s->bytestream += n;
 103         ptr           += linesize;
 104     }
 105
 106     if (avctx->pix_fmt == AV_PIX_FMT_YUV420P || avctx->pix_fmt == AV_PIX_FMT_YUV420P16BE) {
 107         h >>= 1;
 108         n >>= 1;
 109         ptr1 = p->data[1];
 110         ptr2 = p->data[2];
 111         for (i = 0; i < h; i++) {
 112             memcpy(s->bytestream, ptr1, n);
 113             s->bytestream += n;
 114             memcpy(s->bytestream, ptr2, n);
 115             s->bytestream += n;
 116                 ptr1 += p->linesize[1];
 117                 ptr2 += p->linesize[2];
 118         }
 119     }
 120     pkt->size   = s->bytestream - s->bytestream_start;
 121     pkt->flags |= AV_PKT_FLAG_KEY;
 122     *got_packet = 1;
 123
 124     return 0;
 125 }
 126
 127
 128 #if CONFIG_PGM_ENCODER
 129 AVCodec ff_pgm_encoder = {
 130     .name           = "pgm",
 131     .type           = AVMEDIA_TYPE_VIDEO,
 132     .id             = AV_CODEC_ID_PGM,
 133     .priv_data_size = sizeof(PNMContext),
 134     .init           = ff_pnm_init,
 135     .encode2        = pnm_encode_frame,
 136     .pix_fmts       = (const enum AVPixelFormat[]){
 137         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_NONE
 138     },
 139     .long_name      = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
 140 };
 141 #endif
 142
 143 #if CONFIG_PGMYUV_ENCODER
 144 AVCodec ff_pgmyuv_encoder = {
 145     .name           = "pgmyuv",
 146     .type           = AVMEDIA_TYPE_VIDEO,
 147     .id             = AV_CODEC_ID_PGMYUV,
 148     .priv_data_size = sizeof(PNMContext),
 149     .init           = ff_pnm_init,
 150     .encode2        = pnm_encode_frame,
 151     .pix_fmts       = (const enum AVPixelFormat[]){
 152         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P16BE, AV_PIX_FMT_NONE
 153     },
 154     .long_name      = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
 155 };
 156 #endif
 157
 158 #if CONFIG_PPM_ENCODER
 159 AVCodec ff_ppm_encoder = {
 160     .name           = "ppm",
 161     .type           = AVMEDIA_TYPE_VIDEO,
 162     .id             = AV_CODEC_ID_PPM,
 163     .priv_data_size = sizeof(PNMContext),
 164     .init           = ff_pnm_init,
 165     .encode2        = pnm_encode_frame,
 166     .pix_fmts       = (const enum AVPixelFormat[]){
 167         AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB48BE, AV_PIX_FMT_NONE
 168     },
 169     .long_name      = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
 170 };
 171 #endif
 172
 173 #if CONFIG_PBM_ENCODER
 174 AVCodec ff_pbm_encoder = {
 175     .name           = "pbm",
 176     .type           = AVMEDIA_TYPE_VIDEO,
 177     .id             = AV_CODEC_ID_PBM,
 178     .priv_data_size = sizeof(PNMContext),
 179     .init           = ff_pnm_init,
 180     .encode2        = pnm_encode_frame,
 181     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_MONOWHITE,
 182                                                   AV_PIX_FMT_NONE },
 183     .long_name      = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
 184 };
 185 #endif