libavcodec/sunrastenc.c

   1 /*
   2  * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image encoder
   3  * Copyright (c) 2012 Aneesh Dogra (lionaneesh) <lionaneesh@gmail.com>
   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 "sunrast.h"
  26
  27 typedef struct SUNRASTContext {
  28     AVFrame picture;
  29     PutByteContext p;
  30     int depth;      ///< depth of pixel
  31     int length;     ///< length (bytes) of image
  32     int type;       ///< type of file
  33     int maptype;    ///< type of colormap
  34     int maplength;  ///< length (bytes) of colormap
  35     int size;
  36 } SUNRASTContext;
  37
  38 static void sunrast_image_write_header(AVCodecContext *avctx)
  39 {
  40     SUNRASTContext *s = avctx->priv_data;
  41
  42     bytestream2_put_be32u(&s->p, RAS_MAGIC);
  43     bytestream2_put_be32u(&s->p, avctx->width);
  44     bytestream2_put_be32u(&s->p, avctx->height);
  45     bytestream2_put_be32u(&s->p, s->depth);
  46     bytestream2_put_be32u(&s->p, s->length);
  47     bytestream2_put_be32u(&s->p, s->type);
  48     bytestream2_put_be32u(&s->p, s->maptype);
  49     bytestream2_put_be32u(&s->p, s->maplength);
  50 }
  51
  52 static void sunrast_image_write_image(AVCodecContext *avctx,
  53                                       const uint8_t *pixels,
  54                                       const uint32_t *palette_data,
  55                                       int linesize)
  56 {
  57     SUNRASTContext *s = avctx->priv_data;
  58     const uint8_t *ptr;
  59     int len, alen, x;
  60
  61     if (s->maplength) {     // palettized
  62         PutByteContext pb_r, pb_g;
  63         int len = s->maplength / 3;
  64
  65         pb_r = s->p;
  66         bytestream2_skip_p(&s->p, len);
  67         pb_g = s->p;
  68         bytestream2_skip_p(&s->p, len);
  69
  70         for (x = 0; x < len; x++) {
  71             uint32_t pixel = palette_data[x];
  72
  73             bytestream2_put_byteu(&pb_r, (pixel >> 16) & 0xFF);
  74             bytestream2_put_byteu(&pb_g, (pixel >> 8)  & 0xFF);
  75             bytestream2_put_byteu(&s->p,  pixel        & 0xFF);
  76         }
  77     }
  78
  79     len  = (s->depth * avctx->width + 7) >> 3;
  80     alen = len + (len & 1);
  81     ptr  = pixels;
  82
  83      if (s->type == RT_BYTE_ENCODED) {
  84         uint8_t value, value2;
  85         int run;
  86         const uint8_t *start = linesize < 0 ? pixels + (avctx->height - 1) * linesize
  87                                             : pixels;
  88         const uint8_t *end   = linesize < 0 ? pixels - linesize
  89                                             : pixels + avctx->height * linesize;
  90
  91         ptr = pixels;
  92
  93 #define GET_VALUE ptr >= end || ptr < start ? 0 : x >= len ? ptr[len-1] : ptr[x]
  94
  95         x = 0;
  96         value2 = GET_VALUE;
  97         while (ptr < end && ptr >= start) {
  98             run = 1;
  99             value = value2;
 100             x++;
 101             if (x >= alen) {
 102                 x = 0;
 103                 ptr += linesize;
 104             }
 105
 106             value2 = GET_VALUE;
 107             while (value2 == value && run < 256 && ptr < end && ptr >= start) {
 108                 x++;
 109                 run++;
 110                 if (x >= alen) {
 111                     x = 0;
 112                     ptr += linesize;
 113                 }
 114                 value2 = GET_VALUE;
 115             }
 116
 117             if (run > 2 || value == RLE_TRIGGER) {
 118                 bytestream2_put_byteu(&s->p, RLE_TRIGGER);
 119                 bytestream2_put_byteu(&s->p, run - 1);
 120                 if (run > 1)
 121                     bytestream2_put_byteu(&s->p, value);
 122             } else if (run == 1) {
 123                 bytestream2_put_byteu(&s->p, value);
 124             } else
 125                 bytestream2_put_be16u(&s->p, (value << 8) | value);
 126         }
 127
 128         // update data length for header
 129         s->length = bytestream2_tell_p(&s->p) - 32 - s->maplength;
 130     } else {
 131         int y;
 132         for (y = 0; y < avctx->height; y++) {
 133             bytestream2_put_buffer(&s->p, ptr, len);
 134             if (len < alen)
 135                 bytestream2_put_byteu(&s->p, 0);
 136             ptr += linesize;
 137         }
 138     }
 139 }
 140
 141 static av_cold int sunrast_encode_init(AVCodecContext *avctx)
 142 {
 143     SUNRASTContext *s = avctx->priv_data;
 144
 145     switch (avctx->coder_type) {
 146     case FF_CODER_TYPE_RLE:
 147         s->type = RT_BYTE_ENCODED;
 148         break;
 149     case FF_CODER_TYPE_RAW:
 150         s->type = RT_STANDARD;
 151         break;
 152     default:
 153         av_log(avctx, AV_LOG_ERROR, "invalid coder_type\n");
 154         return AVERROR(EINVAL);
 155     }
 156
 157     avctx->coded_frame            = &s->picture;
 158     avctx->coded_frame->key_frame = 1;
 159     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
 160     s->maptype                    = RMT_NONE;
 161     s->maplength                  = 0;
 162
 163     switch (avctx->pix_fmt) {
 164     case AV_PIX_FMT_MONOWHITE:
 165         s->depth = 1;
 166         break;
 167     case AV_PIX_FMT_PAL8 :
 168         s->maptype   = RMT_EQUAL_RGB;
 169         s->maplength = 3 * 256;
 170     case AV_PIX_FMT_GRAY8:
 171         s->depth = 8;
 172         break;
 173     case AV_PIX_FMT_BGR24:
 174         s->depth = 24;
 175         break;
 176     default:
 177         return AVERROR_BUG;
 178     }
 179     s->length = avctx->height * (FFALIGN(avctx->width * s->depth, 16) >> 3);
 180     s->size   = 32 + s->maplength +
 181                 s->length * (s->type == RT_BYTE_ENCODED ? 2 : 1);
 182
 183     return 0;
 184 }
 185
 186 static int sunrast_encode_frame(AVCodecContext *avctx,  AVPacket *avpkt,
 187                                 const AVFrame *frame, int *got_packet_ptr)
 188 {
 189     SUNRASTContext *s = avctx->priv_data;
 190     int ret;
 191
 192     if ((ret = ff_alloc_packet(avpkt, s->size)) < 0)
 193         return ret;
 194
 195     bytestream2_init_writer(&s->p, avpkt->data, avpkt->size);
 196     sunrast_image_write_header(avctx);
 197     sunrast_image_write_image(avctx, frame->data[0],
 198                               (const uint32_t *)frame->data[1],
 199                               frame->linesize[0]);
 200     // update data length in header after RLE
 201     if (s->type == RT_BYTE_ENCODED)
 202         AV_WB32(&avpkt->data[16], s->length);
 203
 204     *got_packet_ptr = 1;
 205     avpkt->flags |= AV_PKT_FLAG_KEY;
 206     avpkt->size = bytestream2_tell_p(&s->p);
 207     return 0;
 208 }
 209
 210 static const AVCodecDefault sunrast_defaults[] = {
 211      { "coder", "rle" },
 212      { NULL },
 213 };
 214
 215 AVCodec ff_sunrast_encoder = {
 216     .name           = "sunrast",
 217     .type           = AVMEDIA_TYPE_VIDEO,
 218     .id             = AV_CODEC_ID_SUNRAST,
 219     .priv_data_size = sizeof(SUNRASTContext),
 220     .init           = sunrast_encode_init,
 221     .encode2        = sunrast_encode_frame,
 222     .defaults       = sunrast_defaults,
 223     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24,
 224                                                   AV_PIX_FMT_PAL8,
 225                                                   AV_PIX_FMT_GRAY8,
 226                                                   AV_PIX_FMT_MONOWHITE,
 227                                                   AV_PIX_FMT_NONE },
 228     .long_name      = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
 229 };