mirror of https://git.ffmpeg.org/ffmpeg.git
90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
/*
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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 "decode.h"
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#include "thread.h"
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static unsigned int getv(GetByteContext * gb)
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{
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int i;
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unsigned int v = 0;
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do {
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i = bytestream2_get_byte(gb);
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v = (v << 7) | (i & 0x7F);
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} while (i & 0x80);
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return v;
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}
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static void readbits(uint8_t * dst, int width, int height, int linesize, const uint8_t * src, int size)
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{
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int wpad = (width + 7) / 8;
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for (int j = 0; j < height && size > 0; j++) {
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memcpy(dst, src, FFMIN(wpad, size));
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src += wpad;
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size -= wpad;
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dst += linesize;
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}
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}
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static int wbmp_decode_frame(AVCodecContext *avctx, AVFrame *p,
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int *got_frame, AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size, width, height, ret;
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GetByteContext gb;
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bytestream2_init(&gb, buf, buf_size);
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if (getv(&gb))
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return AVERROR_INVALIDDATA;
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bytestream2_skip(&gb, 1);
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width = getv(&gb);
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height = getv(&gb);
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if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
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return ret;
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avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
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if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
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return ret;
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if (p->linesize[0] == (width + 7) / 8)
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bytestream2_get_buffer(&gb, p->data[0], height * ((width + 7) / 8));
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else
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readbits(p->data[0], width, height, p->linesize[0], gb.buffer, gb.buffer_end - gb.buffer);
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*got_frame = 1;
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return buf_size;
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}
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const FFCodec ff_wbmp_decoder = {
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.p.name = "wbmp",
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CODEC_LONG_NAME("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_DECODE_CB(wbmp_decode_frame),
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};
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