diff options
author | Mike Melanson <mike@multimedia.cx> | 2004-10-27 08:30:48 +0400 |
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committer | Mike Melanson <mike@multimedia.cx> | 2004-10-27 08:30:48 +0400 |
commit | ab711b3c8d59671e2f506a9febd030f74fda006b (patch) | |
tree | 899ae36dc2010b090aeb109609562b93b4f809bd /libavcodec/xl.c | |
parent | 3237f7318344f55a9397eeaa1e4536319c7a9987 (diff) |
Miro VideoXL (VIXL) decoder, courtesy of Konstantin Shishkov
Originally committed as revision 3641 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/xl.c')
-rw-r--r-- | libavcodec/xl.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/libavcodec/xl.c b/libavcodec/xl.c new file mode 100644 index 0000000000..0f496017d9 --- /dev/null +++ b/libavcodec/xl.c @@ -0,0 +1,144 @@ +/* + * Miro VideoXL codec + * Copyright (c) 2004 Konstantin Shishkov + * + * This library 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 of the License, or (at your option) any later version. + * + * This library 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 this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +/** + * @file xl.c + * Miro VideoXL codec. + */ + +#include "avcodec.h" +#include "mpegvideo.h" + +typedef struct VideoXLContext{ + AVCodecContext *avctx; + AVFrame pic; +} VideoXLContext; + +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 *data_size, + uint8_t *buf, int buf_size) +{ + VideoXLContext * const a = avctx->priv_data; + AVFrame * const p= (AVFrame*)&a->pic; + uint8_t *Y, *U, *V; + int i, j; + int stride; + uint32_t val; + int y0, y1, y2, y3, c0, c1; + + + /* special case for last picture */ + if (buf_size == 0) { + return 0; + } + + if(p->data[0]) + avctx->release_buffer(avctx, p); + + p->reference = 0; + if(avctx->get_buffer(avctx, p) < 0){ + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return -1; + } + p->pict_type= I_TYPE; + p->key_frame= 1; + + Y = a->pic.data[0]; + U = a->pic.data[1]; + V = a->pic.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 = LE_32(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 += a->pic.linesize[0]; + U += a->pic.linesize[1]; + V += a->pic.linesize[2]; + } + + *data_size = sizeof(AVFrame); + *(AVFrame*)data = a->pic; + + return buf_size; +} + +static int decode_init(AVCodecContext *avctx){ +// VideoXLContext * const a = avctx->priv_data; + + avctx->pix_fmt= PIX_FMT_YUV411P; + + return 0; +} + +AVCodec xl_decoder = { + "xl", + CODEC_TYPE_VIDEO, + CODEC_ID_VIXL, + sizeof(VideoXLContext), + decode_init, + NULL, + NULL, + decode_frame, + CODEC_CAP_DR1, +}; |