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92 lines
2.7 KiB
92 lines
2.7 KiB
/* |
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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_start); |
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p->key_frame = 1; |
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p->pict_type = AV_PICTURE_TYPE_I; |
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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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