| 1 | /* |
| 2 | * PC Paintbrush PCX (.pcx) image encoder |
| 3 | * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu> |
| 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 | /** |
| 23 | * @file |
| 24 | * PCX image encoder |
| 25 | * @author Daniel Verkamp |
| 26 | * @see http://www.qzx.com/pc-gpe/pcx.txt |
| 27 | */ |
| 28 | |
| 29 | #include "avcodec.h" |
| 30 | #include "bytestream.h" |
| 31 | #include "libavutil/imgutils.h" |
| 32 | #include "internal.h" |
| 33 | |
| 34 | static const uint32_t monoblack_pal[16] = { 0x000000, 0xFFFFFF }; |
| 35 | |
| 36 | static av_cold int pcx_encode_init(AVCodecContext *avctx) |
| 37 | { |
| 38 | avctx->coded_frame = av_frame_alloc(); |
| 39 | if (!avctx->coded_frame) |
| 40 | return AVERROR(ENOMEM); |
| 41 | |
| 42 | avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; |
| 43 | avctx->coded_frame->key_frame = 1; |
| 44 | |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | static av_cold int pcx_encode_close(AVCodecContext *avctx) |
| 49 | { |
| 50 | av_frame_free(&avctx->coded_frame); |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * PCX run-length encoder |
| 56 | * @param dst output buffer |
| 57 | * @param dst_size size of output buffer |
| 58 | * @param src input buffer |
| 59 | * @param src_plane_size size of one plane of input buffer in bytes |
| 60 | * @param nplanes number of planes in input buffer |
| 61 | * @return number of bytes written to dst or -1 on error |
| 62 | * @bug will not work for nplanes != 1 && bpp != 8 |
| 63 | */ |
| 64 | static int pcx_rle_encode( uint8_t *dst, int dst_size, |
| 65 | const uint8_t *src, int src_plane_size, int nplanes) |
| 66 | { |
| 67 | int p; |
| 68 | const uint8_t *dst_start = dst; |
| 69 | |
| 70 | // check worst-case upper bound on dst_size |
| 71 | if (dst_size < 2LL * src_plane_size * nplanes || src_plane_size <= 0) |
| 72 | return -1; |
| 73 | |
| 74 | for (p = 0; p < nplanes; p++) { |
| 75 | int count = 1; |
| 76 | const uint8_t *src_plane = src + p; |
| 77 | const uint8_t *src_plane_end = src_plane + src_plane_size * nplanes; |
| 78 | uint8_t prev = *src_plane; |
| 79 | src_plane += nplanes; |
| 80 | |
| 81 | for (; ; src_plane += nplanes) { |
| 82 | if (src_plane < src_plane_end && *src_plane == prev && count < 0x3F) { |
| 83 | // current byte is same as prev |
| 84 | ++count; |
| 85 | } else { |
| 86 | // output prev * count |
| 87 | if (count != 1 || prev >= 0xC0) |
| 88 | *dst++ = 0xC0 | count; |
| 89 | *dst++ = prev; |
| 90 | |
| 91 | if (src_plane == src_plane_end) |
| 92 | break; |
| 93 | |
| 94 | // start new run |
| 95 | count = 1; |
| 96 | prev = *src_plane; |
| 97 | } |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | return dst - dst_start; |
| 102 | } |
| 103 | |
| 104 | static int pcx_encode_frame(AVCodecContext *avctx, AVPacket *pkt, |
| 105 | const AVFrame *frame, int *got_packet) |
| 106 | { |
| 107 | const uint8_t *buf_end; |
| 108 | uint8_t *buf; |
| 109 | |
| 110 | int bpp, nplanes, i, y, line_bytes, written, ret, max_pkt_size, sw, sh; |
| 111 | const uint32_t *pal = NULL; |
| 112 | uint32_t palette256[256]; |
| 113 | const uint8_t *src; |
| 114 | |
| 115 | if (avctx->width > 65535 || avctx->height > 65535) { |
| 116 | av_log(avctx, AV_LOG_ERROR, "image dimensions do not fit in 16 bits\n"); |
| 117 | return -1; |
| 118 | } |
| 119 | |
| 120 | switch (avctx->pix_fmt) { |
| 121 | case AV_PIX_FMT_RGB24: |
| 122 | bpp = 8; |
| 123 | nplanes = 3; |
| 124 | break; |
| 125 | case AV_PIX_FMT_RGB8: |
| 126 | case AV_PIX_FMT_BGR8: |
| 127 | case AV_PIX_FMT_RGB4_BYTE: |
| 128 | case AV_PIX_FMT_BGR4_BYTE: |
| 129 | case AV_PIX_FMT_GRAY8: |
| 130 | bpp = 8; |
| 131 | nplanes = 1; |
| 132 | avpriv_set_systematic_pal2(palette256, avctx->pix_fmt); |
| 133 | pal = palette256; |
| 134 | break; |
| 135 | case AV_PIX_FMT_PAL8: |
| 136 | bpp = 8; |
| 137 | nplanes = 1; |
| 138 | pal = (uint32_t *)frame->data[1]; |
| 139 | break; |
| 140 | case AV_PIX_FMT_MONOBLACK: |
| 141 | bpp = 1; |
| 142 | nplanes = 1; |
| 143 | pal = monoblack_pal; |
| 144 | break; |
| 145 | default: |
| 146 | av_log(avctx, AV_LOG_ERROR, "unsupported pixfmt\n"); |
| 147 | return -1; |
| 148 | } |
| 149 | |
| 150 | line_bytes = (avctx->width * bpp + 7) >> 3; |
| 151 | line_bytes = (line_bytes + 1) & ~1; |
| 152 | |
| 153 | max_pkt_size = 128 + avctx->height * 2 * line_bytes * nplanes + (pal ? 256*3 + 1 : 0); |
| 154 | if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0) |
| 155 | return ret; |
| 156 | buf = pkt->data; |
| 157 | buf_end = pkt->data + pkt->size; |
| 158 | |
| 159 | sw = avctx->sample_aspect_ratio.num; |
| 160 | sh = avctx->sample_aspect_ratio.den; |
| 161 | if (sw > 0xFFFFu || sh > 0xFFFFu) |
| 162 | av_reduce(&sw, &sh, sw, sh, 0xFFFFu); |
| 163 | |
| 164 | bytestream_put_byte(&buf, 10); // manufacturer |
| 165 | bytestream_put_byte(&buf, 5); // version |
| 166 | bytestream_put_byte(&buf, 1); // encoding |
| 167 | bytestream_put_byte(&buf, bpp); // bits per pixel per plane |
| 168 | bytestream_put_le16(&buf, 0); // x min |
| 169 | bytestream_put_le16(&buf, 0); // y min |
| 170 | bytestream_put_le16(&buf, avctx->width - 1); // x max |
| 171 | bytestream_put_le16(&buf, avctx->height - 1); // y max |
| 172 | bytestream_put_le16(&buf, sw); // horizontal DPI |
| 173 | bytestream_put_le16(&buf, sh); // vertical DPI |
| 174 | for (i = 0; i < 16; i++) |
| 175 | bytestream_put_be24(&buf, pal ? pal[i] : 0);// palette (<= 16 color only) |
| 176 | bytestream_put_byte(&buf, 0); // reserved |
| 177 | bytestream_put_byte(&buf, nplanes); // number of planes |
| 178 | bytestream_put_le16(&buf, line_bytes); // scanline plane size in bytes |
| 179 | |
| 180 | while (buf - pkt->data < 128) |
| 181 | *buf++= 0; |
| 182 | |
| 183 | src = frame->data[0]; |
| 184 | |
| 185 | for (y = 0; y < avctx->height; y++) { |
| 186 | if ((written = pcx_rle_encode(buf, buf_end - buf, |
| 187 | src, line_bytes, nplanes)) < 0) { |
| 188 | av_log(avctx, AV_LOG_ERROR, "buffer too small\n"); |
| 189 | return -1; |
| 190 | } |
| 191 | buf += written; |
| 192 | src += frame->linesize[0]; |
| 193 | } |
| 194 | |
| 195 | if (nplanes == 1 && bpp == 8) { |
| 196 | if (buf_end - buf < 257) { |
| 197 | av_log(avctx, AV_LOG_ERROR, "buffer too small\n"); |
| 198 | return -1; |
| 199 | } |
| 200 | bytestream_put_byte(&buf, 12); |
| 201 | for (i = 0; i < 256; i++) { |
| 202 | bytestream_put_be24(&buf, pal[i]); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | pkt->size = buf - pkt->data; |
| 207 | pkt->flags |= AV_PKT_FLAG_KEY; |
| 208 | *got_packet = 1; |
| 209 | |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | AVCodec ff_pcx_encoder = { |
| 214 | .name = "pcx", |
| 215 | .long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"), |
| 216 | .type = AVMEDIA_TYPE_VIDEO, |
| 217 | .id = AV_CODEC_ID_PCX, |
| 218 | .init = pcx_encode_init, |
| 219 | .close = pcx_encode_close, |
| 220 | .encode2 = pcx_encode_frame, |
| 221 | .pix_fmts = (const enum AVPixelFormat[]){ |
| 222 | AV_PIX_FMT_RGB24, |
| 223 | AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE, |
| 224 | AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8, |
| 225 | AV_PIX_FMT_MONOBLACK, |
| 226 | AV_PIX_FMT_NONE |
| 227 | }, |
| 228 | }; |