diff options
Diffstat (limited to 'ffmpeg/libavcodec/xl.c')
| -rw-r--r-- | ffmpeg/libavcodec/xl.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/xl.c b/ffmpeg/libavcodec/xl.c new file mode 100644 index 0000000..f50b650 --- /dev/null +++ b/ffmpeg/libavcodec/xl.c @@ -0,0 +1,139 @@ +/* + * Miro VideoXL codec + * Copyright (c) 2004 Konstantin Shishkov + * + * 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 + */ + +/** + * @file + * Miro VideoXL codec. + */ + +#include "libavutil/common.h" +#include "libavutil/intreadwrite.h" +#include "avcodec.h" +#include "internal.h" + +static const int xl_table[32] = { + 0, 1, 2, 3, 4, 5, 6, 7, + 8, 9, 12, 15, 20, 25, 34, 46, + 64, 82, 94, 103, 108, 113, 116, 119, + 120, 121, 122, 123, 124, 125, 126, 127 +}; + +static int decode_frame(AVCodecContext *avctx, + void *data, int *got_frame, + AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + AVFrame * const p = data; + uint8_t *Y, *U, *V; + int i, j, ret; + int stride; + uint32_t val; + int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0; + + if (avctx->width & 3) { + av_log(avctx, AV_LOG_ERROR, "width is not a multiple of 4\n"); + return AVERROR_INVALIDDATA; + } + + if (buf_size < avctx->width * avctx->height) { + av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); + return AVERROR_INVALIDDATA; + } + + if ((ret = ff_get_buffer(avctx, p, 0)) < 0) + return ret; + p->pict_type = AV_PICTURE_TYPE_I; + p->key_frame = 1; + + Y = p->data[0]; + U = p->data[1]; + V = p->data[2]; + + stride = avctx->width - 4; + + for (i = 0; i < avctx->height; i++) { + /* lines are stored in reversed order */ + buf += stride; + + for (j = 0; j < avctx->width; j += 4) { + /* value is stored in LE dword with word swapped */ + val = AV_RL32(buf); + buf -= 4; + val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16); + + if(!j) + y0 = (val & 0x1F) << 2; + else + y0 = y3 + xl_table[val & 0x1F]; + val >>= 5; + y1 = y0 + xl_table[val & 0x1F]; + val >>= 5; + y2 = y1 + xl_table[val & 0x1F]; + val >>= 6; /* align to word */ + y3 = y2 + xl_table[val & 0x1F]; + val >>= 5; + if(!j) + c0 = (val & 0x1F) << 2; + else + c0 += xl_table[val & 0x1F]; + val >>= 5; + if(!j) + c1 = (val & 0x1F) << 2; + else + c1 += xl_table[val & 0x1F]; + + Y[j + 0] = y0 << 1; + Y[j + 1] = y1 << 1; + Y[j + 2] = y2 << 1; + Y[j + 3] = y3 << 1; + + U[j >> 2] = c0 << 1; + V[j >> 2] = c1 << 1; + } + + buf += avctx->width + 4; + Y += p->linesize[0]; + U += p->linesize[1]; + V += p->linesize[2]; + } + + *got_frame = 1; + + return buf_size; +} + +static av_cold int decode_init(AVCodecContext *avctx) +{ + avctx->pix_fmt = AV_PIX_FMT_YUV411P; + + return 0; +} + +AVCodec ff_xl_decoder = { + .name = "xl", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_VIXL, + .init = decode_init, + .decode = decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"), +}; |