From e35070582e1be55ef502fbb0339472fdf8f35d89 Mon Sep 17 00:00:00 2001 From: Aurelien Jacobs Date: Sun, 29 Aug 2010 21:23:30 +0000 Subject: move m4v demuxer to its own file Originally committed as revision 24976 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/m4vdec.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 libavformat/m4vdec.c (limited to 'libavformat/m4vdec.c') diff --git a/libavformat/m4vdec.c b/libavformat/m4vdec.c new file mode 100644 index 0000000000..21a2b5058b --- /dev/null +++ b/libavformat/m4vdec.c @@ -0,0 +1,62 @@ +/* + * RAW MPEG-4 video demuxer + * Copyright (c) 2006 Thijs Vermeir + * + * 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 VISUAL_OBJECT_START_CODE 0x000001b5 +#define VOP_START_CODE 0x000001b6 + +static int mpeg4video_probe(AVProbeData *probe_packet) +{ + uint32_t temp_buffer= -1; + int VO=0, VOL=0, VOP = 0, VISO = 0, res=0; + int i; + + for(i=0; ibuf_size; i++){ + temp_buffer = (temp_buffer<<8) + probe_packet->buf[i]; + if ((temp_buffer & 0xffffff00) != 0x100) + continue; + + if (temp_buffer == VOP_START_CODE) VOP++; + else if (temp_buffer == VISUAL_OBJECT_START_CODE) VISO++; + else if (temp_buffer < 0x120) VO++; + else if (temp_buffer < 0x130) VOL++; + else if ( !(0x1AF < temp_buffer && temp_buffer < 0x1B7) + && !(0x1B9 < temp_buffer && temp_buffer < 0x1C4)) res++; + } + + if ( VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res==0) + return AVPROBE_SCORE_MAX/2; + return 0; +} + +AVInputFormat m4v_demuxer = { + "m4v", + NULL_IF_CONFIG_SMALL("raw MPEG-4 video format"), + 0, + mpeg4video_probe, /** probing for MPEG-4 data */ + ff_raw_video_read_header, + ff_raw_read_partial_packet, + .flags= AVFMT_GENERIC_INDEX, + .extensions = "m4v", + .value = CODEC_ID_MPEG4, +}; -- cgit v1.2.3