dv patch by Max Krasnyansky (maxk at qualcomm dot com)
Originally committed as revision 1493 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
parent
4b8b2edb62
commit
8aa3ee32c2
19
configure
vendored
19
configure
vendored
@ -53,6 +53,7 @@ gprof="no"
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v4l="yes"
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audio_oss="yes"
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audio_beos="no"
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dv1394="yes"
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network="yes"
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zlib="yes"
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mp3lame="no"
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@ -103,6 +104,7 @@ SHFLAGS=-nostart
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# disable linux things
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audio_oss="no"
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v4l="no"
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dv1394="no"
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# enable beos things
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audio_beos="yes"
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# no need for libm, but the inet stuff
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@ -117,6 +119,7 @@ fi ;;
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SunOS)
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v4l="no"
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audio_oss="no"
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dv1394="no"
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make="gmake"
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LDFLAGS=""
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FFSLDFLAGS=""
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@ -126,12 +129,14 @@ extralibs="$extralibs -lsocket -lnsl"
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FreeBSD)
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v4l="no"
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audio_oss="yes"
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dv1394="no"
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make="gmake"
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LDFLAGS="$LDFLAGS -export-dynamic"
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;;
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BSD/OS)
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v4l="no"
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audio_oss="yes"
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dv1394="no"
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extralibs="-lpoll -lgnugetopt -lm"
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make="gmake"
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;;
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@ -139,6 +144,7 @@ Darwin)
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cc="cc"
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v4l="no"
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audio_oss="no"
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dv1394="no"
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SHFLAGS="-dynamiclib"
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extralibs=""
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darwin="yes"
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@ -158,6 +164,7 @@ esac
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MINGW32*)
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v4l="no"
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audio_oss="no"
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dv1394="no"
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ffserver="no"
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network="no"
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mingw32="yes"
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@ -165,6 +172,7 @@ mingw32="yes"
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CYGWIN*)
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v4l="no"
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audio_oss="yes"
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dv1394="no"
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extralibs=""
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cygwin="yes"
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test -f /usr/include/inttypes.h || \
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@ -190,6 +198,7 @@ SLIBSUF=".dll"
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extralibs=""
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v4l="no"
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audio_oss="no"
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dv1394="no"
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network="no"
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ffserver="no"
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os2="yes"
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@ -287,6 +296,8 @@ for opt do
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;;
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--disable-audio-beos) audio_beos="no"
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;;
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--disable-dv1394) dv1394="no"
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;;
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--disable-network) network="no"
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;;
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--disable-zlib) zlib="no"
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@ -375,6 +386,7 @@ if test "$win32" = "yes" ; then
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cross_prefix="i386-mingw32msvc-"
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v4l="no"
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audio_oss="no"
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dv1394="no"
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network="no"
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fi
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@ -382,6 +394,7 @@ if test "$mingw32" = "yes" ; then
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cross_prefix=""
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v4l="no"
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audio_oss="no"
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dv1394="no"
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network="no"
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fi
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@ -543,6 +556,7 @@ echo " --disable-altivec disable AltiVec usage"
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echo " --disable-audio-oss disable OSS audio support [default=no]"
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echo " --disable-audio-beos disable BeOS audio support [default=no]"
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echo " --disable-v4l disable video4linux grabbing [default=no]"
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echo " --disable-dv1394 disable DV1394 grabbing [default=no]"
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echo " --disable-network disable network support [default=no]"
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echo " --disable-zlib disable zlib [default=no]"
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echo " --disable-simple_idct disable simple IDCT routines [default=no]"
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@ -705,6 +719,11 @@ if test "$v4l" = "yes" ; then
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echo "CONFIG_VIDEO4LINUX=yes" >> config.mak
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fi
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if test "$dv1394" = "yes" ; then
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echo "#define CONFIG_DV1394 1" >> $TMPH
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echo "CONFIG_DV1394=yes" >> config.mak
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fi
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if test "$dlopen" = "yes" ; then
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echo "#define CONFIG_HAVE_DLOPEN 1" >> $TMPH
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fi
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21
ffmpeg.c
21
ffmpeg.c
@ -158,14 +158,14 @@ static char *pass_logfilename = NULL;
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static int audio_stream_copy = 0;
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static int video_stream_copy = 0;
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static char *video_grab_format = "video4linux";
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static char *audio_grab_format = "audio_device";
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#define DEFAULT_PASS_LOGFILENAME "ffmpeg2pass"
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#if !defined(CONFIG_AUDIO_OSS) && !defined(CONFIG_AUDIO_BEOS)
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const char *audio_device = "none";
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#endif
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#ifndef CONFIG_VIDEO4LINUX
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const char *v4l_device = "none";
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#endif
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typedef struct AVOutputStream {
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int file_index; /* file index */
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@ -1870,7 +1870,7 @@ void opt_audio_channels(const char *arg)
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void opt_video_device(const char *arg)
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{
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v4l_device = strdup(arg);
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video_device = strdup(arg);
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}
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void opt_audio_device(const char *arg)
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@ -1878,6 +1878,12 @@ void opt_audio_device(const char *arg)
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audio_device = strdup(arg);
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}
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void opt_dv1394(const char *arg)
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{
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video_grab_format = "dv1394";
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audio_grab_format = "none";
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}
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void opt_audio_codec(const char *arg)
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{
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AVCodec *p;
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@ -2455,7 +2461,7 @@ void prepare_grab(void)
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if (has_video) {
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AVInputFormat *fmt1;
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fmt1 = av_find_input_format("video_grab_device");
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fmt1 = av_find_input_format(video_grab_format);
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if (av_open_input_file(&ic, "", fmt1, 0, ap) < 0) {
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fprintf(stderr, "Could not find video grab device\n");
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exit(1);
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@ -2463,12 +2469,12 @@ void prepare_grab(void)
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/* by now video grab has one stream */
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ic->streams[0]->r_frame_rate = ap->frame_rate;
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input_files[nb_input_files] = ic;
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dump_format(ic, nb_input_files, v4l_device, 0);
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dump_format(ic, nb_input_files, video_device, 0);
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nb_input_files++;
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}
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if (has_audio) {
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AVInputFormat *fmt1;
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fmt1 = av_find_input_format("audio_device");
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fmt1 = av_find_input_format(audio_grab_format);
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if (av_open_input_file(&ic, "", fmt1, 0, ap) < 0) {
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fprintf(stderr, "Could not find audio grab device\n");
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exit(1);
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@ -2692,6 +2698,7 @@ const OptionDef options[] = {
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{ "minrate", HAS_ARG, {(void*)opt_video_bitrate_min}, "set min video bitrate tolerance (in kbit/s)", "bitrate" },
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{ "bufsize", HAS_ARG, {(void*)opt_video_buffer_size}, "set ratecontrol buffere size (in kbit)", "size" },
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{ "vd", HAS_ARG | OPT_EXPERT, {(void*)opt_video_device}, "set video grab device", "device" },
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{ "dv1394", OPT_EXPERT, {(void*)opt_dv1394}, "set DV1394 options", "[channel]" },
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{ "vcodec", HAS_ARG | OPT_EXPERT, {(void*)opt_video_codec}, "force video codec ('copy' to copy stream)", "codec" },
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{ "me", HAS_ARG | OPT_EXPERT, {(void*)opt_motion_estimation}, "set motion estimation method",
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"method" },
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@ -28,6 +28,10 @@ ifeq ($(CONFIG_VIDEO4LINUX),yes)
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OBJS+= grab.o
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endif
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ifeq ($(CONFIG_DV1394),yes)
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OBJS+= dv1394.o
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endif
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ifeq ($(CONFIG_AUDIO_OSS),yes)
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OBJS+= audio.o
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endif
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@ -21,6 +21,8 @@
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/* If you do not call this function, then you can select exactly which
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formats you want to support */
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char *video_device = "none";
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/**
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* Initialize libavcodec and register all the codecs and formats.
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*/
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@ -62,6 +64,10 @@ void av_register_all(void)
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audio_init();
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#endif
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#ifdef CONFIG_DV1394
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dv1394_init();
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#endif
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/* image formats */
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av_register_image_format(&pnm_image_format);
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av_register_image_format(&pbm_image_format);
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249
libavformat/dv1394.c
Normal file
249
libavformat/dv1394.c
Normal file
@ -0,0 +1,249 @@
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/*
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* Linux DV1394 interface
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* Copyright (c) 2003 Max Krasnyansky <maxk@qualcomm.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/poll.h>
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#include <sys/time.h>
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#include <time.h>
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#include "avformat.h"
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#undef DV1394_DEBUG
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#include "dv1394.h"
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int dv1394_channel = DV1394_DEFAULT_CHANNEL;
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struct dv1394_data {
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int fd;
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int channel;
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int width, height;
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int frame_rate;
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int frame_size;
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void *ring; /* Ring buffer */
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int index; /* Current frame index */
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int avail; /* Number of frames available for reading */
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int done; /* Number of completed frames */
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};
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static int dv1394_reset(struct dv1394_data *dv)
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{
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struct dv1394_init init;
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init.channel = dv->channel;
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init.api_version = DV1394_API_VERSION;
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init.n_frames = DV1394_RING_FRAMES;
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init.format = DV1394_NTSC;
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if (ioctl(dv->fd, DV1394_INIT, &init) < 0)
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return -1;
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dv->avail = 0;
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return 0;
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}
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static int dv1394_start(struct dv1394_data *dv)
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{
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/* Tell DV1394 driver to enable receiver */
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if (ioctl(dv->fd, DV1394_START_RECEIVE, 0) < 0) {
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perror("Failed to start receiver");
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return -1;
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}
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return 0;
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}
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static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap)
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{
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struct dv1394_data *dv = context->priv_data;
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AVStream *st;
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st = av_new_stream(context, 0);
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if (!st)
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return -ENOMEM;
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dv->width = DV1394_WIDTH;
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dv->height = DV1394_HEIGHT;
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dv->channel = dv1394_channel;
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dv->frame_rate = 30;
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dv->frame_size = DV1394_NTSC_FRAME_SIZE;
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/* Open and initialize DV1394 device */
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dv->fd = open(video_device, O_RDONLY);
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if (dv->fd < 0) {
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perror("Failed to open DV interface");
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goto failed;
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}
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if (dv1394_reset(dv) < 0) {
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perror("Failed to initialize DV interface");
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goto failed;
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}
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dv->ring = mmap(NULL, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES,
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PROT_READ, MAP_PRIVATE, dv->fd, 0);
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if (!dv->ring) {
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perror("Failed to mmap DV ring buffer");
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goto failed;
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}
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st->codec.codec_type = CODEC_TYPE_VIDEO;
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st->codec.codec_id = CODEC_ID_DVVIDEO;
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st->codec.width = dv->width;
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st->codec.height = dv->height;
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st->codec.frame_rate = dv->frame_rate * FRAME_RATE_BASE;
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st->codec.bit_rate = 25000000; /* Consumer DV is 25Mbps */
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av_set_pts_info(context, 48, 1, 1000000);
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if (dv1394_start(dv) < 0)
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goto failed;
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return 0;
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failed:
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close(dv->fd);
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av_free(st);
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return -EIO;
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}
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static inline int __copy_frame(struct dv1394_data *dv, void *buf)
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{
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char *ptr = dv->ring + (dv->index * dv->frame_size);
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memcpy(buf, ptr, dv->frame_size);
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dv->index = (dv->index + 1) % DV1394_RING_FRAMES;
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dv->avail--;
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dv->done++;
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return dv->frame_size;
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}
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static int dv1394_read_packet(AVFormatContext * context, AVPacket * pkt)
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{
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struct dv1394_data *dv = context->priv_data;
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int len;
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if (!dv->avail) {
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struct dv1394_status s;
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struct pollfd p;
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p.fd = dv->fd;
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p.events = POLLIN | POLLERR | POLLHUP;
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/* Wait until more frames are available */
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if (poll(&p, 1, -1) < 0) {
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perror("Poll failed");
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return -EIO;
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}
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if (ioctl(dv->fd, DV1394_GET_STATUS, &s) < 0) {
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perror("Failed to get status");
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return -EIO;
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}
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#ifdef DV1394_DEBUG
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fprintf(stderr, "DV1394: status\n"
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"\tactive_frame\t%d\n"
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"\tfirst_clear_frame\t%d\n"
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"\tn_clear_frames\t%d\n"
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"\tdropped_frames\t%d\n",
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s.active_frame, s.first_clear_frame,
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s.n_clear_frames, s.dropped_frames);
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#endif
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dv->avail = s.n_clear_frames;
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dv->index = s.first_clear_frame;
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dv->done = 0;
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if (s.dropped_frames) {
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fprintf(stderr, "DV1394: Frame drop detected (%d). Reseting ..\n",
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s.dropped_frames);
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dv1394_reset(dv);
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dv1394_start(dv);
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}
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}
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if (av_new_packet(pkt, dv->frame_size) < 0)
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return -EIO;
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#ifdef DV1394_DEBUG
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fprintf(stderr, "index %d, avail %d, done %d\n", dv->index, dv->avail,
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dv->done);
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#endif
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len = __copy_frame(dv, pkt->data);
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pkt->pts = av_gettime() & ((1LL << 48) - 1);
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if (!dv->avail && dv->done) {
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/* Request more frames */
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if (ioctl(dv->fd, DV1394_RECEIVE_FRAMES, dv->done) < 0) {
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/* This usually means that ring buffer overflowed.
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* We have to reset :(.
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*/
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fprintf(stderr, "DV1394: Ring buffer overflow. Reseting ..\n");
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dv1394_reset(dv);
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dv1394_start(dv);
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}
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}
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return len;
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}
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static int dv1394_close(AVFormatContext * context)
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{
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struct dv1394_data *dv = context->priv_data;
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/* Shutdown DV1394 receiver */
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if (ioctl(dv->fd, DV1394_SHUTDOWN, 0) < 0)
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perror("Failed to shutdown DV1394");
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/* Unmap ring buffer */
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if (munmap(dv->ring, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES) < 0)
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perror("Failed to munmap DV1394 ring buffer");
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close(dv->fd);
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return 0;
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}
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static AVInputFormat dv1394_format = {
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.name = "dv1394",
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.long_name = "dv1394 A/V grab",
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.priv_data_size = sizeof(struct dv1394_data),
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.read_header = dv1394_read_header,
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.read_packet = dv1394_read_packet,
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.read_close = dv1394_close,
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.flags = AVFMT_NOFILE
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};
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int dv1394_init(void)
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{
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av_register_input_format(&dv1394_format);
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return 0;
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}
|
353
libavformat/dv1394.h
Normal file
353
libavformat/dv1394.h
Normal file
@ -0,0 +1,353 @@
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/*
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* dv1394.h - DV input/output over IEEE 1394 on OHCI chips
|
||||
* Copyright (C)2001 Daniel Maas <dmaas@dcine.com>
|
||||
* receive, proc_fs by Dan Dennedy <dan@dennedy.org>
|
||||
*
|
||||
* based on:
|
||||
* video1394.h - driver for OHCI 1394 boards
|
||||
* Copyright (C)1999,2000 Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>
|
||||
* Peter Schlaile <udbz@rz.uni-karlsruhe.de>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program 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 General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software Foundation,
|
||||
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
||||
*/
|
||||
|
||||
#ifndef _DV_1394_H
|
||||
#define _DV_1394_H
|
||||
|
||||
#define DV1394_DEFAULT_CHANNEL 0x63
|
||||
#define DV1394_DEFAULT_CARD 0
|
||||
#define DV1394_RING_FRAMES 20
|
||||
|
||||
#define DV1394_WIDTH 720
|
||||
#define DV1394_HEIGHT 480
|
||||
|
||||
/* This is the public user-space interface. Try not to break it. */
|
||||
|
||||
#define DV1394_API_VERSION 0x20011127
|
||||
|
||||
/* ********************
|
||||
** **
|
||||
** DV1394 API **
|
||||
** **
|
||||
********************
|
||||
|
||||
There are two methods of operating the DV1394 DV output device.
|
||||
|
||||
1)
|
||||
|
||||
The simplest is an interface based on write(): simply write
|
||||
full DV frames of data to the device, and they will be transmitted
|
||||
as quickly as possible. The FD may be set for non-blocking I/O,
|
||||
in which case you can use select() or poll() to wait for output
|
||||
buffer space.
|
||||
|
||||
To set the DV output parameters (e.g. whether you want NTSC or PAL
|
||||
video), use the DV1394_INIT ioctl, passing in the parameters you
|
||||
want in a struct dv1394_init.
|
||||
|
||||
Example 1:
|
||||
To play a raw .DV file: cat foo.DV > /dev/dv1394
|
||||
(cat will use write() internally)
|
||||
|
||||
Example 2:
|
||||
static struct dv1394_init init = {
|
||||
0x63, (broadcast channel)
|
||||
4, (four-frame ringbuffer)
|
||||
DV1394_NTSC, (send NTSC video)
|
||||
0, 0 (default empty packet rate)
|
||||
}
|
||||
|
||||
ioctl(fd, DV1394_INIT, &init);
|
||||
|
||||
while(1) {
|
||||
read( <a raw DV file>, buf, DV1394_NTSC_FRAME_SIZE );
|
||||
write( <the dv1394 FD>, buf, DV1394_NTSC_FRAME_SIZE );
|
||||
}
|
||||
|
||||
2)
|
||||
|
||||
For more control over buffering, and to avoid unnecessary copies
|
||||
of the DV data, you can use the more sophisticated the mmap() interface.
|
||||
First, call the DV1394_INIT ioctl to specify your parameters,
|
||||
including the number of frames in the ringbuffer. Then, calling mmap()
|
||||
on the dv1394 device will give you direct access to the ringbuffer
|
||||
from which the DV card reads your frame data.
|
||||
|
||||
The ringbuffer is simply one large, contiguous region of memory
|
||||
containing two or more frames of packed DV data. Each frame of DV data
|
||||
is 120000 bytes (NTSC) or 144000 bytes (PAL).
|
||||
|
||||
Fill one or more frames in the ringbuffer, then use the DV1394_SUBMIT_FRAMES
|
||||
ioctl to begin I/O. You can use either the DV1394_WAIT_FRAMES ioctl
|
||||
or select()/poll() to wait until the frames are transmitted. Next, you'll
|
||||
need to call the DV1394_GET_STATUS ioctl to determine which ringbuffer
|
||||
frames are clear (ready to be filled with new DV data). Finally, use
|
||||
DV1394_SUBMIT_FRAMES again to send the new data to the DV output.
|
||||
|
||||
|
||||
Example: here is what a four-frame ringbuffer might look like
|
||||
during DV transmission:
|
||||
|
||||
|
||||
frame 0 frame 1 frame 2 frame 3
|
||||
|
||||
*--------------------------------------*
|
||||
| CLEAR | DV data | DV data | CLEAR |
|
||||
*--------------------------------------*
|
||||
<ACTIVE>
|
||||
|
||||
transmission goes in this direction --->>>
|
||||
|
||||
|
||||
The DV hardware is currently transmitting the data in frame 1.
|
||||
Once frame 1 is finished, it will automatically transmit frame 2.
|
||||
(if frame 2 finishes before frame 3 is submitted, the device
|
||||
will continue to transmit frame 2, and will increase the dropped_frames
|
||||
counter each time it repeats the transmission).
|
||||
|
||||
|
||||
If you called DV1394_GET_STATUS at this instant, you would
|
||||
receive the following values:
|
||||
|
||||
n_frames = 4
|
||||
active_frame = 1
|
||||
first_clear_frame = 3
|
||||
n_clear_frames = 2
|
||||
|
||||
At this point, you should write new DV data into frame 3 and optionally
|
||||
frame 0. Then call DV1394_SUBMIT_FRAMES to inform the device that
|
||||
it may transmit the new frames.
|
||||
|
||||
ERROR HANDLING
|
||||
|
||||
An error (buffer underflow/overflow or a break in the DV stream due
|
||||
to a 1394 bus reset) can be detected by checking the dropped_frames
|
||||
field of struct dv1394_status (obtained through the
|
||||
DV1394_GET_STATUS ioctl).
|
||||
|
||||
The best way to recover from such an error is to re-initialize
|
||||
dv1394, either by using the DV1394_INIT ioctl call, or closing the
|
||||
file descriptor and opening it again. (note that you must unmap all
|
||||
ringbuffer mappings when closing the file descriptor, or else
|
||||
dv1394 will still be considered 'in use').
|
||||
|
||||
MAIN LOOP
|
||||
|
||||
For maximum efficiency and robustness against bus errors, you are
|
||||
advised to model the main loop of your application after the
|
||||
following pseudo-code example:
|
||||
|
||||
(checks of system call return values omitted for brevity; always
|
||||
check return values in your code!)
|
||||
|
||||
while( frames left ) {
|
||||
|
||||
struct pollfd *pfd = ...;
|
||||
|
||||
pfd->fd = dv1394_fd;
|
||||
pfd->revents = 0;
|
||||
pfd->events = POLLOUT | POLLIN; (OUT for transmit, IN for receive)
|
||||
|
||||
(add other sources of I/O here)
|
||||
|
||||
poll(pfd, 1, -1); (or select(); add a timeout if you want)
|
||||
|
||||
if(pfd->revents) {
|
||||
struct dv1394_status status;
|
||||
|
||||
ioctl(dv1394_fd, DV1394_GET_STATUS, &status);
|
||||
|
||||
if(status.dropped_frames > 0) {
|
||||
reset_dv1394();
|
||||
} else {
|
||||
for(int i = 0; i < status.n_clear_frames; i++) {
|
||||
copy_DV_frame();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
where copy_DV_frame() reads or writes on the dv1394 file descriptor
|
||||
(read/write mode) or copies data to/from the mmap ringbuffer and
|
||||
then calls ioctl(DV1394_SUBMIT_FRAMES) to notify dv1394 that new
|
||||
frames are availble (mmap mode).
|
||||
|
||||
reset_dv1394() is called in the event of a buffer
|
||||
underflow/overflow or a halt in the DV stream (e.g. due to a 1394
|
||||
bus reset). To guarantee recovery from the error, this function
|
||||
should close the dv1394 file descriptor (and munmap() all
|
||||
ringbuffer mappings, if you are using them), then re-open the
|
||||
dv1394 device (and re-map the ringbuffer).
|
||||
|
||||
*/
|
||||
|
||||
|
||||
/* maximum number of frames in the ringbuffer */
|
||||
#define DV1394_MAX_FRAMES 32
|
||||
|
||||
/* number of *full* isochronous packets per DV frame */
|
||||
#define DV1394_NTSC_PACKETS_PER_FRAME 250
|
||||
#define DV1394_PAL_PACKETS_PER_FRAME 300
|
||||
|
||||
/* size of one frame's worth of DV data, in bytes */
|
||||
#define DV1394_NTSC_FRAME_SIZE (480 * DV1394_NTSC_PACKETS_PER_FRAME)
|
||||
#define DV1394_PAL_FRAME_SIZE (480 * DV1394_PAL_PACKETS_PER_FRAME)
|
||||
|
||||
|
||||
/* ioctl() commands */
|
||||
|
||||
enum {
|
||||
/* I don't like using 0 as a valid ioctl() */
|
||||
DV1394_INVALID = 0,
|
||||
|
||||
|
||||
/* get the driver ready to transmit video.
|
||||
pass a struct dv1394_init* as the parameter (see below),
|
||||
or NULL to get default parameters */
|
||||
DV1394_INIT,
|
||||
|
||||
|
||||
/* stop transmitting video and free the ringbuffer */
|
||||
DV1394_SHUTDOWN,
|
||||
|
||||
|
||||
/* submit N new frames to be transmitted, where
|
||||
the index of the first new frame is first_clear_buffer,
|
||||
and the index of the last new frame is
|
||||
(first_clear_buffer + N) % n_frames */
|
||||
DV1394_SUBMIT_FRAMES,
|
||||
|
||||
|
||||
/* block until N buffers are clear (pass N as the parameter)
|
||||
Because we re-transmit the last frame on underrun, there
|
||||
will at most be n_frames - 1 clear frames at any time */
|
||||
DV1394_WAIT_FRAMES,
|
||||
|
||||
/* capture new frames that have been received, where
|
||||
the index of the first new frame is first_clear_buffer,
|
||||
and the index of the last new frame is
|
||||
(first_clear_buffer + N) % n_frames */
|
||||
DV1394_RECEIVE_FRAMES,
|
||||
|
||||
|
||||
DV1394_START_RECEIVE,
|
||||
|
||||
|
||||
/* pass a struct dv1394_status* as the parameter (see below) */
|
||||
DV1394_GET_STATUS,
|
||||
};
|
||||
|
||||
|
||||
|
||||
enum pal_or_ntsc {
|
||||
DV1394_NTSC = 0,
|
||||
DV1394_PAL
|
||||
};
|
||||
|
||||
|
||||
|
||||
|
||||
/* this is the argument to DV1394_INIT */
|
||||
struct dv1394_init {
|
||||
/* DV1394_API_VERSION */
|
||||
unsigned int api_version;
|
||||
|
||||
/* isochronous transmission channel to use */
|
||||
unsigned int channel;
|
||||
|
||||
/* number of frames in the ringbuffer. Must be at least 2
|
||||
and at most DV1394_MAX_FRAMES. */
|
||||
unsigned int n_frames;
|
||||
|
||||
/* send/receive PAL or NTSC video format */
|
||||
enum pal_or_ntsc format;
|
||||
|
||||
/* the following are used only for transmission */
|
||||
|
||||
/* set these to zero unless you want a
|
||||
non-default empty packet rate (see below) */
|
||||
unsigned long cip_n;
|
||||
unsigned long cip_d;
|
||||
|
||||
/* set this to zero unless you want a
|
||||
non-default SYT cycle offset (default = 3 cycles) */
|
||||
unsigned int syt_offset;
|
||||
};
|
||||
|
||||
/* NOTE: you may only allocate the DV frame ringbuffer once each time
|
||||
you open the dv1394 device. DV1394_INIT will fail if you call it a
|
||||
second time with different 'n_frames' or 'format' arguments (which
|
||||
would imply a different size for the ringbuffer). If you need a
|
||||
different buffer size, simply close and re-open the device, then
|
||||
initialize it with your new settings. */
|
||||
|
||||
/* Q: What are cip_n and cip_d? */
|
||||
|
||||
/*
|
||||
A: DV video streams do not utilize 100% of the potential bandwidth offered
|
||||
by IEEE 1394 (FireWire). To achieve the correct rate of data transmission,
|
||||
DV devices must periodically insert empty packets into the 1394 data stream.
|
||||
Typically there is one empty packet per 14-16 data-carrying packets.
|
||||
|
||||
Some DV devices will accept a wide range of empty packet rates, while others
|
||||
require a precise rate. If the dv1394 driver produces empty packets at
|
||||
a rate that your device does not accept, you may see ugly patterns on the
|
||||
DV output, or even no output at all.
|
||||
|
||||
The default empty packet insertion rate seems to work for many people; if
|
||||
your DV output is stable, you can simply ignore this discussion. However,
|
||||
we have exposed the empty packet rate as a parameter to support devices that
|
||||
do not work with the default rate.
|
||||
|
||||
The decision to insert an empty packet is made with a numerator/denominator
|
||||
algorithm. Empty packets are produced at an average rate of CIP_N / CIP_D.
|
||||
You can alter the empty packet rate by passing non-zero values for cip_n
|
||||
and cip_d to the INIT ioctl.
|
||||
|
||||
*/
|
||||
|
||||
|
||||
|
||||
struct dv1394_status {
|
||||
/* this embedded init struct returns the current dv1394
|
||||
parameters in use */
|
||||
struct dv1394_init init;
|
||||
|
||||
/* the ringbuffer frame that is currently being
|
||||
displayed. (-1 if the device is not transmitting anything) */
|
||||
int active_frame;
|
||||
|
||||
/* index of the first buffer (ahead of active_frame) that
|
||||
is ready to be filled with data */
|
||||
unsigned int first_clear_frame;
|
||||
|
||||
/* how many buffers, including first_clear_buffer, are
|
||||
ready to be filled with data */
|
||||
unsigned int n_clear_frames;
|
||||
|
||||
/* how many times the DV stream has underflowed, overflowed,
|
||||
or otherwise encountered an error, since the previous call
|
||||
to DV1394_GET_STATUS */
|
||||
unsigned int dropped_frames;
|
||||
|
||||
/* N.B. The dropped_frames counter is only a lower bound on the actual
|
||||
number of dropped frames, with the special case that if dropped_frames
|
||||
is zero, then it is guaranteed that NO frames have been dropped
|
||||
since the last call to DV1394_GET_STATUS.
|
||||
*/
|
||||
};
|
||||
|
||||
|
||||
#endif /* _DV_1394_H */
|
@ -53,8 +53,6 @@ static int aiw_init(VideoData *s);
|
||||
static int aiw_read_picture(VideoData *s, uint8_t *data);
|
||||
static int aiw_close(VideoData *s);
|
||||
|
||||
const char *v4l_device = "/dev/video";
|
||||
|
||||
static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
|
||||
{
|
||||
VideoData *s = s1->priv_data;
|
||||
@ -80,9 +78,9 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
|
||||
s->height = height;
|
||||
s->frame_rate = frame_rate;
|
||||
|
||||
video_fd = open(v4l_device, O_RDWR);
|
||||
video_fd = open(video_device, O_RDWR);
|
||||
if (video_fd < 0) {
|
||||
perror(v4l_device);
|
||||
perror(video_device);
|
||||
goto fail;
|
||||
}
|
||||
|
||||
@ -339,7 +337,7 @@ static int grab_read_close(AVFormatContext *s1)
|
||||
}
|
||||
|
||||
static AVInputFormat video_grab_device_format = {
|
||||
"video_grab_device",
|
||||
"video4linux",
|
||||
"video grab",
|
||||
sizeof(VideoData),
|
||||
NULL,
|
||||
|
Loading…
Reference in New Issue
Block a user