| /* |
| * 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), |
| }; |