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90 lines
2.7 KiB
90 lines
2.7 KiB
2 years ago
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/*
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* WBMP (Wireless Application Protocol Bitmap) image
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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 "bytestream.h"
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#include "codec_internal.h"
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#include "encode.h"
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static void putv(uint8_t ** bufp, unsigned int v)
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{
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unsigned int vv = 0;
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int n = 0;
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while (vv != v)
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vv += v & (0x7F << 7 * n++);
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while (--n > 0)
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bytestream_put_byte(bufp, 0x80 | (v & (0x7F << 7 * n)) >> 7 * n);
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bytestream_put_byte(bufp, v & 0x7F);
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}
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static void writebits(uint8_t ** bufp, const uint8_t * src, int width, int height, int linesize)
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{
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int wpad = (width + 7) / 8;
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for (int j = 0; j < height; j++) {
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memcpy(*bufp, src, wpad);
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*bufp += wpad;
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src += linesize;
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}
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}
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static int wbmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *frame, int *got_packet)
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{
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int64_t size = avctx->height * ((avctx->width + 7) / 8) + 32;
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uint8_t *buf;
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int ret;
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if ((ret = ff_get_encode_buffer(avctx, pkt, size, 0)) < 0)
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return ret;
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buf = pkt->data;
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putv(&buf, 0);
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bytestream_put_byte(&buf, 0);
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putv(&buf, avctx->width);
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putv(&buf, avctx->height);
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if (frame->linesize[0] == (avctx->width + 7) / 8)
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bytestream_put_buffer(&buf, frame->data[0], avctx->height * ((avctx->width + 7) / 8));
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else
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writebits(&buf, frame->data[0], avctx->width, avctx->height, frame->linesize[0]);
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av_shrink_packet(pkt, 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_wbmp_encoder = {
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.p.name = "wbmp",
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.p.long_name = NULL_IF_CONFIG_SMALL("WBMP (Wireless Application Protocol Bitmap) image"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_WBMP,
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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
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FF_CODEC_ENCODE_CB(wbmp_encode_frame),
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.p.pix_fmts = (const enum AVPixelFormat[]){
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AV_PIX_FMT_MONOBLACK,
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AV_PIX_FMT_NONE
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},
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};
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