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https://github.com/FFmpeg/FFmpeg.git
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878f8cabe8
Use a small LUT instead. Improves performance. Reviewed-by: Marton Balint <cus@passwd.hu> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/*
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* XBM image format
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*
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "codec_internal.h"
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#include "encode.h"
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#define ANSI_MIN_READLINE 509
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static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *p, int *got_packet)
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{
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int i, j, l, commas, ret, size, linesize, lineout, rowsout;
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const uint8_t *ptr;
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uint8_t *buf;
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linesize = lineout = (avctx->width + 7) / 8;
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commas = avctx->height * linesize;
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/* ANSI worst case minimum readline is 509 chars. */
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rowsout = avctx->height;
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if (lineout > (ANSI_MIN_READLINE / 6)) {
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lineout = ANSI_MIN_READLINE / 6;
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rowsout = (commas + lineout - 1) / lineout;
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}
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size = rowsout * (lineout * 6 + 1) + 106;
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if ((ret = ff_alloc_packet(avctx, pkt, size)) < 0)
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return ret;
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buf = pkt->data;
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ptr = p->data[0];
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buf += snprintf(buf, 32, "#define image_width %u\n", avctx->width);
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buf += snprintf(buf, 33, "#define image_height %u\n", avctx->height);
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buf += snprintf(buf, 39, "static unsigned char image_bits[] = {\n");
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for (i = 0, l = lineout; i < avctx->height; i++) {
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for (j = 0; j < linesize; j++) {
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// 0..15 bitreversed as chars
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static const char lut[] = {
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'0', '8', '4', 'C', '2', 'A', '6', 'E',
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'1', '9', '5', 'D', '3', 'B', '7', 'F'
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};
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buf[0] = ' ';
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buf[1] = '0';
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buf[2] = 'x';
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buf[3] = lut[*ptr & 0xF];
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buf[4] = lut[*ptr >> 4];
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buf += 5;
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ptr++;
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if (--commas <= 0) {
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*buf++ = '\n';
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break;
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}
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*buf++ = ',';
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if (--l <= 0) {
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*buf++ = '\n';
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l = lineout;
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}
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}
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ptr += p->linesize[0] - linesize;
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}
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buf += snprintf(buf, 5, " };\n");
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pkt->size = buf - pkt->data;
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*got_packet = 1;
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return 0;
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}
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const FFCodec ff_xbm_encoder = {
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.p.name = "xbm",
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CODEC_LONG_NAME("XBM (X BitMap) image"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_XBM,
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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
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FF_CODEC_ENCODE_CB(xbm_encode_frame),
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.p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE,
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AV_PIX_FMT_NONE },
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};
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