mirror of https://git.ffmpeg.org/ffmpeg.git
93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/*
|
|
* WBMP (Wireless Application Protocol Bitmap) image
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
#include "codec_internal.h"
|
|
#include "decode.h"
|
|
#include "thread.h"
|
|
|
|
static unsigned int getv(GetByteContext * gb)
|
|
{
|
|
int i;
|
|
unsigned int v = 0;
|
|
|
|
do {
|
|
i = bytestream2_get_byte(gb);
|
|
v = (v << 7) | (i & 0x7F);
|
|
} while (i & 0x80);
|
|
return v;
|
|
}
|
|
|
|
static void readbits(uint8_t * dst, int width, int height, int linesize, const uint8_t * src, int size)
|
|
{
|
|
int wpad = (width + 7) / 8;
|
|
for (int j = 0; j < height && size > 0; j++) {
|
|
memcpy(dst, src, FFMIN(wpad, size));
|
|
src += wpad;
|
|
size -= wpad;
|
|
dst += linesize;
|
|
}
|
|
}
|
|
|
|
static int wbmp_decode_frame(AVCodecContext *avctx, AVFrame *p,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size, width, height, ret;
|
|
GetByteContext gb;
|
|
|
|
bytestream2_init(&gb, buf, buf_size);
|
|
|
|
if (getv(&gb))
|
|
return AVERROR_INVALIDDATA;
|
|
bytestream2_skip(&gb, 1);
|
|
width = getv(&gb);
|
|
height = getv(&gb);
|
|
|
|
if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
|
|
return ret;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
|
|
if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
|
|
return ret;
|
|
|
|
if (p->linesize[0] == (width + 7) / 8)
|
|
bytestream2_get_buffer(&gb, p->data[0], height * ((width + 7) / 8));
|
|
else
|
|
readbits(p->data[0], width, height, p->linesize[0], gb.buffer, gb.buffer_end - gb.buffer);
|
|
|
|
p->flags |= AV_FRAME_FLAG_KEY;
|
|
p->pict_type = AV_PICTURE_TYPE_I;
|
|
|
|
*got_frame = 1;
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
const FFCodec ff_wbmp_decoder = {
|
|
.p.name = "wbmp",
|
|
CODEC_LONG_NAME("WBMP (Wireless Application Protocol Bitmap) image"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_WBMP,
|
|
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
|
|
FF_CODEC_DECODE_CB(wbmp_decode_frame),
|
|
};
|