FFmpeg/libavformat/cdg.c
Michael Niedermayer 9d76cf0b18 Merge remote-tracking branch 'qatar/master'
* qatar/master:
  rtpdec: Templatize the code for different g726 bitrate variants
  rv40: move loop filter to rv34dsp context
  lavf: make av_set_pts_info private.
  rtpdec: Add support for G726 audio
  rtpdec: Add an init function that can do custom codec context initialization
  avconv: make copy_tb on by default.
  matroskadec: don't set codec timebase.
  rmdec: don't set codec timebase.
  avconv: compute next_pts from input packet duration when possible.
  lavf: estimate frame duration from r_frame_rate.
  avconv: update InputStream.pts in the streamcopy case.

Conflicts:
	avconv.c
	libavdevice/alsa-audio-dec.c
	libavdevice/bktr.c
	libavdevice/fbdev.c
	libavdevice/libdc1394.c
	libavdevice/oss_audio.c
	libavdevice/v4l.c
	libavdevice/v4l2.c
	libavdevice/vfwcap.c
	libavdevice/x11grab.c
	libavformat/au.c
	libavformat/eacdata.c
	libavformat/flvdec.c
	libavformat/mpegts.c
	libavformat/mxfenc.c
	libavformat/rtpdec_g726.c
	libavformat/wtv.c
	libavformat/xmv.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2011-12-01 02:54:24 +01:00

79 lines
2.2 KiB
C

/*
* CD Graphics Demuxer
* Copyright (c) 2009 Michael Tison
*
* 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 "internal.h"
#define CDG_PACKET_SIZE 24
#define CDG_COMMAND 0x09
#define CDG_MASK 0x3F
static int read_header(AVFormatContext *s, AVFormatParameters *ap)
{
AVStream *vst;
int ret;
vst = avformat_new_stream(s, NULL);
if (!vst)
return AVERROR(ENOMEM);
vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codec->codec_id = CODEC_ID_CDGRAPHICS;
/// 75 sectors/sec * 4 packets/sector = 300 packets/sec
avpriv_set_pts_info(vst, 32, 1, 300);
ret = avio_size(s->pb);
if (ret > 0)
vst->duration = (ret * vst->time_base.den) / (CDG_PACKET_SIZE * 300);
return 0;
}
static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret;
while (1) {
ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE);
if (ret < 1 || (pkt->data[0] & CDG_MASK) == CDG_COMMAND)
break;
av_free_packet(pkt);
}
pkt->stream_index = 0;
pkt->dts=pkt->pts= s->streams[0]->cur_dts;
if(ret>5 && (pkt->data[0]&0x3F) == 9 && (pkt->data[1]&0x3F)==1 && !(pkt->data[2+2+1] & 0x0F)){
pkt->flags = AV_PKT_FLAG_KEY;
}
return ret;
}
AVInputFormat ff_cdg_demuxer = {
.name = "cdg",
.long_name = NULL_IF_CONFIG_SMALL("CD Graphics Format"),
.read_header = read_header,
.read_packet = read_packet,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "cdg"
};