diff options
Diffstat (limited to 'libavformat/cavsvideodec.c')
-rw-r--r-- | libavformat/cavsvideodec.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/libavformat/cavsvideodec.c b/libavformat/cavsvideodec.c new file mode 100644 index 0000000000..937d4b671b --- /dev/null +++ b/libavformat/cavsvideodec.c @@ -0,0 +1,77 @@ +/* + * RAW Chinese AVS video demuxer + * Copyright (c) 2009 Stefan Gehrer <stefan.gehrer@gmx.de> + * + * 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 "avformat.h" +#include "raw.h" + +#define CAVS_SEQ_START_CODE 0x000001b0 +#define CAVS_PIC_I_START_CODE 0x000001b3 +#define CAVS_UNDEF_START_CODE 0x000001b4 +#define CAVS_PIC_PB_START_CODE 0x000001b6 +#define CAVS_VIDEO_EDIT_CODE 0x000001b7 +#define CAVS_PROFILE_JIZHUN 0x20 + +static int cavsvideo_probe(AVProbeData *p) +{ + uint32_t code= -1; + int pic=0, seq=0, slice_pos = 0; + int i; + + for(i=0; i<p->buf_size; i++){ + code = (code<<8) + p->buf[i]; + if ((code & 0xffffff00) == 0x100) { + if(code < CAVS_SEQ_START_CODE) { + /* slices have to be consecutive */ + if(code < slice_pos) + return 0; + slice_pos = code; + } else { + slice_pos = 0; + } + if (code == CAVS_SEQ_START_CODE) { + seq++; + /* check for the only currently supported profile */ + if(p->buf[i+1] != CAVS_PROFILE_JIZHUN) + return 0; + } else if ((code == CAVS_PIC_I_START_CODE) || + (code == CAVS_PIC_PB_START_CODE)) { + pic++; + } else if ((code == CAVS_UNDEF_START_CODE) || + (code > CAVS_VIDEO_EDIT_CODE)) { + return 0; + } + } + } + if(seq && seq*9<=pic*10) + return AVPROBE_SCORE_MAX/2; + return 0; +} + +AVInputFormat cavsvideo_demuxer = { + "cavsvideo", + NULL_IF_CONFIG_SMALL("raw Chinese AVS video"), + 0, + cavsvideo_probe, + ff_raw_video_read_header, + ff_raw_read_partial_packet, + .flags= AVFMT_GENERIC_INDEX, + .value = CODEC_ID_CAVS, +}; |