| 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 FFmpeg. |
| 6 | * |
| 7 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; 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 | PutByteContext p; |
| 29 | int depth; ///< depth of pixel |
| 30 | int length; ///< length (bytes) of image |
| 31 | int type; ///< type of file |
| 32 | int maptype; ///< type of colormap |
| 33 | int maplength; ///< length (bytes) of colormap |
| 34 | int size; |
| 35 | } SUNRASTContext; |
| 36 | |
| 37 | static void sunrast_image_write_header(AVCodecContext *avctx) |
| 38 | { |
| 39 | SUNRASTContext *s = avctx->priv_data; |
| 40 | |
| 41 | bytestream2_put_be32u(&s->p, RAS_MAGIC); |
| 42 | bytestream2_put_be32u(&s->p, avctx->width); |
| 43 | bytestream2_put_be32u(&s->p, avctx->height); |
| 44 | bytestream2_put_be32u(&s->p, s->depth); |
| 45 | bytestream2_put_be32u(&s->p, s->length); |
| 46 | bytestream2_put_be32u(&s->p, s->type); |
| 47 | bytestream2_put_be32u(&s->p, s->maptype); |
| 48 | bytestream2_put_be32u(&s->p, s->maplength); |
| 49 | } |
| 50 | |
| 51 | static void sunrast_image_write_image(AVCodecContext *avctx, |
| 52 | const uint8_t *pixels, |
| 53 | const uint32_t *palette_data, |
| 54 | int linesize) |
| 55 | { |
| 56 | SUNRASTContext *s = avctx->priv_data; |
| 57 | const uint8_t *ptr; |
| 58 | int len, alen, x, y; |
| 59 | |
| 60 | if (s->maplength) { // palettized |
| 61 | PutByteContext pb_r, pb_g; |
| 62 | int len = s->maplength / 3; |
| 63 | |
| 64 | pb_r = s->p; |
| 65 | bytestream2_skip_p(&s->p, len); |
| 66 | pb_g = s->p; |
| 67 | bytestream2_skip_p(&s->p, len); |
| 68 | |
| 69 | for (x = 0; x < len; x++) { |
| 70 | uint32_t pixel = palette_data[x]; |
| 71 | |
| 72 | bytestream2_put_byteu(&pb_r, (pixel >> 16) & 0xFF); |
| 73 | bytestream2_put_byteu(&pb_g, (pixel >> 8) & 0xFF); |
| 74 | bytestream2_put_byteu(&s->p, pixel & 0xFF); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | len = (s->depth * avctx->width + 7) >> 3; |
| 79 | alen = len + (len & 1); |
| 80 | ptr = pixels; |
| 81 | |
| 82 | if (s->type == RT_BYTE_ENCODED) { |
| 83 | uint8_t value, value2; |
| 84 | int run; |
| 85 | |
| 86 | ptr = pixels; |
| 87 | |
| 88 | #define GET_VALUE y >= avctx->height ? 0 : x >= len ? ptr[len-1] : ptr[x] |
| 89 | |
| 90 | x = 0, y = 0; |
| 91 | value2 = GET_VALUE; |
| 92 | while (y < avctx->height) { |
| 93 | run = 1; |
| 94 | value = value2; |
| 95 | x++; |
| 96 | if (x >= alen) { |
| 97 | x = 0; |
| 98 | ptr += linesize, y++; |
| 99 | } |
| 100 | |
| 101 | value2 = GET_VALUE; |
| 102 | while (value2 == value && run < 256 && y < avctx->height) { |
| 103 | x++; |
| 104 | run++; |
| 105 | if (x >= alen) { |
| 106 | x = 0; |
| 107 | ptr += linesize, y++; |
| 108 | } |
| 109 | value2 = GET_VALUE; |
| 110 | } |
| 111 | |
| 112 | if (run > 2 || value == RLE_TRIGGER) { |
| 113 | bytestream2_put_byteu(&s->p, RLE_TRIGGER); |
| 114 | bytestream2_put_byteu(&s->p, run - 1); |
| 115 | if (run > 1) |
| 116 | bytestream2_put_byteu(&s->p, value); |
| 117 | } else if (run == 1) { |
| 118 | bytestream2_put_byteu(&s->p, value); |
| 119 | } else |
| 120 | bytestream2_put_be16u(&s->p, (value << 8) | value); |
| 121 | } |
| 122 | |
| 123 | // update data length for header |
| 124 | s->length = bytestream2_tell_p(&s->p) - 32 - s->maplength; |
| 125 | } else { |
| 126 | for (y = 0; y < avctx->height; y++) { |
| 127 | bytestream2_put_buffer(&s->p, ptr, len); |
| 128 | if (len < alen) |
| 129 | bytestream2_put_byteu(&s->p, 0); |
| 130 | ptr += linesize; |
| 131 | } |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | static av_cold int sunrast_encode_init(AVCodecContext *avctx) |
| 136 | { |
| 137 | SUNRASTContext *s = avctx->priv_data; |
| 138 | |
| 139 | switch (avctx->coder_type) { |
| 140 | case FF_CODER_TYPE_RLE: |
| 141 | s->type = RT_BYTE_ENCODED; |
| 142 | break; |
| 143 | case FF_CODER_TYPE_RAW: |
| 144 | s->type = RT_STANDARD; |
| 145 | break; |
| 146 | default: |
| 147 | av_log(avctx, AV_LOG_ERROR, "invalid coder_type\n"); |
| 148 | return AVERROR(EINVAL); |
| 149 | } |
| 150 | |
| 151 | s->maptype = RMT_NONE; |
| 152 | s->maplength = 0; |
| 153 | |
| 154 | switch (avctx->pix_fmt) { |
| 155 | case AV_PIX_FMT_MONOWHITE: |
| 156 | s->depth = 1; |
| 157 | break; |
| 158 | case AV_PIX_FMT_PAL8 : |
| 159 | s->maptype = RMT_EQUAL_RGB; |
| 160 | s->maplength = 3 * 256; |
| 161 | /* fall-through */ |
| 162 | case AV_PIX_FMT_GRAY8: |
| 163 | s->depth = 8; |
| 164 | break; |
| 165 | case AV_PIX_FMT_BGR24: |
| 166 | s->depth = 24; |
| 167 | break; |
| 168 | default: |
| 169 | return AVERROR_BUG; |
| 170 | } |
| 171 | s->length = avctx->height * (FFALIGN(avctx->width * s->depth, 16) >> 3); |
| 172 | s->size = 32 + s->maplength + |
| 173 | s->length * (s->type == RT_BYTE_ENCODED ? 2 : 1); |
| 174 | |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static int sunrast_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, |
| 179 | const AVFrame *frame, int *got_packet_ptr) |
| 180 | { |
| 181 | SUNRASTContext *s = avctx->priv_data; |
| 182 | int ret; |
| 183 | |
| 184 | if ((ret = ff_alloc_packet2(avctx, avpkt, s->size)) < 0) |
| 185 | return ret; |
| 186 | |
| 187 | bytestream2_init_writer(&s->p, avpkt->data, avpkt->size); |
| 188 | sunrast_image_write_header(avctx); |
| 189 | sunrast_image_write_image(avctx, frame->data[0], |
| 190 | (const uint32_t *)frame->data[1], |
| 191 | frame->linesize[0]); |
| 192 | // update data length in header after RLE |
| 193 | if (s->type == RT_BYTE_ENCODED) |
| 194 | AV_WB32(&avpkt->data[16], s->length); |
| 195 | |
| 196 | *got_packet_ptr = 1; |
| 197 | avpkt->flags |= AV_PKT_FLAG_KEY; |
| 198 | avpkt->size = bytestream2_tell_p(&s->p); |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static av_cold int sunrast_encode_close(AVCodecContext *avctx) |
| 203 | { |
| 204 | av_frame_free(&avctx->coded_frame); |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | static const AVCodecDefault sunrast_defaults[] = { |
| 209 | { "coder", "rle" }, |
| 210 | { NULL }, |
| 211 | }; |
| 212 | |
| 213 | AVCodec ff_sunrast_encoder = { |
| 214 | .name = "sunrast", |
| 215 | .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"), |
| 216 | .type = AVMEDIA_TYPE_VIDEO, |
| 217 | .id = AV_CODEC_ID_SUNRAST, |
| 218 | .priv_data_size = sizeof(SUNRASTContext), |
| 219 | .init = sunrast_encode_init, |
| 220 | .close = sunrast_encode_close, |
| 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 | }; |