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/imgutils.h"
  23 #include "libavutil/pixdesc.h"
  24 #include "avcodec.h"
  25 #include "bytestream.h"
  26 #include "internal.h"
  27
  28 static int pnm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  29                             const AVFrame *pict, int *got_packet)
  30 {
  31     uint8_t *bytestream, *bytestream_start, *bytestream_end;
  32     const AVFrame * const p = pict;
  33     int i, h, h1, c, n, linesize, ret;
  34     uint8_t *ptr, *ptr1, *ptr2;
  35     int size = av_image_get_buffer_size(avctx->pix_fmt,
  36                                         avctx->width, avctx->height, 1);
  37
  38     if ((ret = ff_alloc_packet(pkt, size + 200)) < 0) {
  39         av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
  40         return ret;
  41     }
  42
  43     bytestream_start =
  44     bytestream       = pkt->data;
  45     bytestream_end   = pkt->data + pkt->size;
  46
  47     h  = avctx->height;
  48     h1 = h;
  49     switch (avctx->pix_fmt) {
  50     case AV_PIX_FMT_MONOWHITE:
  51         c  = '4';
  52         n  = (avctx->width + 7) >> 3;
  53         break;
  54     case AV_PIX_FMT_GRAY8:
  55         c  = '5';
  56         n  = avctx->width;
  57         break;
  58     case AV_PIX_FMT_GRAY16BE:
  59         c  = '5';
  60         n  = avctx->width * 2;
  61         break;
  62     case AV_PIX_FMT_RGB24:
  63         c  = '6';
  64         n  = avctx->width * 3;
  65         break;
  66     case AV_PIX_FMT_RGB48BE:
  67         c  = '6';
  68         n  = avctx->width * 6;
  69         break;
  70     case AV_PIX_FMT_YUV420P:
  71         c  = '5';
  72         n  = avctx->width;
  73         h1 = (h * 3) / 2;
  74         break;
  75     case AV_PIX_FMT_YUV420P16BE:
  76         c  = '5';
  77         n  = avctx->width * 2;
  78         h1 = (h * 3) / 2;
  79         break;
  80     default:
  81         return -1;
  82     }
  83     snprintf(bytestream, bytestream_end - bytestream,
  84              "P%c\n%d %d\n", c, avctx->width, h1);
  85     bytestream += strlen(bytestream);
  86     if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE) {
  87         int maxdepth = (1 << av_pix_fmt_desc_get(avctx->pix_fmt)->comp[0].depth) - 1;
  88         snprintf(bytestream, bytestream_end - bytestream,
  89                  "%d\n", maxdepth);
  90         bytestream += strlen(bytestream);
  91     }
  92
  93     ptr      = p->data[0];
  94     linesize = p->linesize[0];
  95     for (i = 0; i < h; i++) {
  96         memcpy(bytestream, ptr, n);
  97         bytestream += n;
  98         ptr        += linesize;
  99     }
 100
 101     if (avctx->pix_fmt == AV_PIX_FMT_YUV420P || avctx->pix_fmt == AV_PIX_FMT_YUV420P16BE) {
 102         h >>= 1;
 103         n >>= 1;
 104         ptr1 = p->data[1];
 105         ptr2 = p->data[2];
 106         for (i = 0; i < h; i++) {
 107             memcpy(bytestream, ptr1, n);
 108             bytestream += n;
 109             memcpy(bytestream, ptr2, n);
 110             bytestream += n;
 111                 ptr1 += p->linesize[1];
 112                 ptr2 += p->linesize[2];
 113         }
 114     }
 115     pkt->size   = bytestream - bytestream_start;
 116     pkt->flags |= AV_PKT_FLAG_KEY;
 117     *got_packet = 1;
 118
 119     return 0;
 120 }
 121
 122 static av_cold int pnm_encode_init(AVCodecContext *avctx)
 123 {
 124 #if FF_API_CODED_FRAME
 125 FF_DISABLE_DEPRECATION_WARNINGS
 126     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
 127     avctx->coded_frame->key_frame = 1;
 128 FF_ENABLE_DEPRECATION_WARNINGS
 129 #endif
 130
 131     return 0;
 132 }
 133
 134 #if CONFIG_PGM_ENCODER
 135 AVCodec ff_pgm_encoder = {
 136     .name           = "pgm",
 137     .long_name      = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
 138     .type           = AVMEDIA_TYPE_VIDEO,
 139     .id             = AV_CODEC_ID_PGM,
 140     .init           = pnm_encode_init,
 141     .encode2        = pnm_encode_frame,
 142     .pix_fmts       = (const enum AVPixelFormat[]){
 143         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_NONE
 144     },
 145 };
 146 #endif
 147
 148 #if CONFIG_PGMYUV_ENCODER
 149 AVCodec ff_pgmyuv_encoder = {
 150     .name           = "pgmyuv",
 151     .long_name      = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
 152     .type           = AVMEDIA_TYPE_VIDEO,
 153     .id             = AV_CODEC_ID_PGMYUV,
 154     .init           = pnm_encode_init,
 155     .encode2        = pnm_encode_frame,
 156     .pix_fmts       = (const enum AVPixelFormat[]){
 157         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P16BE, AV_PIX_FMT_NONE
 158     },
 159 };
 160 #endif
 161
 162 #if CONFIG_PPM_ENCODER
 163 AVCodec ff_ppm_encoder = {
 164     .name           = "ppm",
 165     .long_name      = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
 166     .type           = AVMEDIA_TYPE_VIDEO,
 167     .id             = AV_CODEC_ID_PPM,
 168     .init           = pnm_encode_init,
 169     .encode2        = pnm_encode_frame,
 170     .pix_fmts       = (const enum AVPixelFormat[]){
 171         AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB48BE, AV_PIX_FMT_NONE
 172     },
 173 };
 174 #endif
 175
 176 #if CONFIG_PBM_ENCODER
 177 AVCodec ff_pbm_encoder = {
 178     .name           = "pbm",
 179     .long_name      = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
 180     .type           = AVMEDIA_TYPE_VIDEO,
 181     .id             = AV_CODEC_ID_PBM,
 182     .init           = pnm_encode_init,
 183     .encode2        = pnm_encode_frame,
 184     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_MONOWHITE,
 185                                                   AV_PIX_FMT_NONE },
 186 };
 187 #endif