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dv patch by Max Krasnyansky (maxk at qualcomm dot com) 

Originally committed as revision 1493 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Max Krasnyansky Fabrice Bellard 23 years ago
parent
4b8b2edb62
commit
8aa3ee32c2
7 changed files with 648 additions and 12 deletions
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  1. +19
    -0
      configure
  2. +14
    -7
      ffmpeg.c
  3. +4
    -0
      libavformat/Makefile
  4. +6
    -0
      libavformat/allformats.c
  5. +249
    -0
      libavformat/dv1394.c
  6. +353
    -0
      libavformat/dv1394.h
  7. +3
    -5
      libavformat/grab.c

+ 19
- 0
configure View File

@@ -53,6 +53,7 @@ gprof="no"
v4l="yes"
audio_oss="yes"
audio_beos="no"
dv1394="yes"
network="yes"
zlib="yes"
mp3lame="no"
@@ -103,6 +104,7 @@ SHFLAGS=-nostart
# disable linux things
audio_oss="no"
v4l="no"
dv1394="no"
# enable beos things
audio_beos="yes"
# no need for libm, but the inet stuff
@@ -117,6 +119,7 @@ fi ;;
SunOS)
v4l="no"
audio_oss="no"
dv1394="no"
make="gmake"
LDFLAGS=""
FFSLDFLAGS=""
@@ -126,12 +129,14 @@ extralibs="$extralibs -lsocket -lnsl"
FreeBSD)
v4l="no"
audio_oss="yes"
dv1394="no"
make="gmake"
LDFLAGS="$LDFLAGS -export-dynamic"
;;
BSD/OS)
v4l="no"
audio_oss="yes"
dv1394="no"
extralibs="-lpoll -lgnugetopt -lm"
make="gmake"
;;
@@ -139,6 +144,7 @@ Darwin)
cc="cc"
v4l="no"
audio_oss="no"
dv1394="no"
SHFLAGS="-dynamiclib"
extralibs=""
darwin="yes"
@@ -158,6 +164,7 @@ esac
MINGW32*)
v4l="no"
audio_oss="no"
dv1394="no"
ffserver="no"
network="no"
mingw32="yes"
@@ -165,6 +172,7 @@ mingw32="yes"
CYGWIN*)
v4l="no"
audio_oss="yes"
dv1394="no"
extralibs=""
cygwin="yes"
test -f /usr/include/inttypes.h || \
@@ -190,6 +198,7 @@ SLIBSUF=".dll"
extralibs=""
v4l="no"
audio_oss="no"
dv1394="no"
network="no"
ffserver="no"
os2="yes"
@@ -287,6 +296,8 @@ for opt do
;;
--disable-audio-beos) audio_beos="no"
;;
--disable-dv1394) dv1394="no"
;;
--disable-network) network="no"
;;
--disable-zlib) zlib="no"
@@ -375,6 +386,7 @@ if test "$win32" = "yes" ; then
cross_prefix="i386-mingw32msvc-"
v4l="no"
audio_oss="no"
dv1394="no"
network="no"
fi

@@ -382,6 +394,7 @@ if test "$mingw32" = "yes" ; then
cross_prefix=""
v4l="no"
audio_oss="no"
dv1394="no"
network="no"
fi

@@ -543,6 +556,7 @@ echo " --disable-altivec disable AltiVec usage"
echo " --disable-audio-oss disable OSS audio support [default=no]"
echo " --disable-audio-beos disable BeOS audio support [default=no]"
echo " --disable-v4l disable video4linux grabbing [default=no]"
echo " --disable-dv1394 disable DV1394 grabbing [default=no]"
echo " --disable-network disable network support [default=no]"
echo " --disable-zlib disable zlib [default=no]"
echo " --disable-simple_idct disable simple IDCT routines [default=no]"
@@ -705,6 +719,11 @@ if test "$v4l" = "yes" ; then
echo "CONFIG_VIDEO4LINUX=yes" >> config.mak
fi

if test "$dv1394" = "yes" ; then
echo "#define CONFIG_DV1394 1" >> $TMPH
echo "CONFIG_DV1394=yes" >> config.mak
fi

if test "$dlopen" = "yes" ; then
echo "#define CONFIG_HAVE_DLOPEN 1" >> $TMPH
fi


+ 14
- 7
ffmpeg.c View File

@@ -158,14 +158,14 @@ static char *pass_logfilename = NULL;
static int audio_stream_copy = 0;
static int video_stream_copy = 0;

static char *video_grab_format = "video4linux";
static char *audio_grab_format = "audio_device";

#define DEFAULT_PASS_LOGFILENAME "ffmpeg2pass"

#if !defined(CONFIG_AUDIO_OSS) && !defined(CONFIG_AUDIO_BEOS)
const char *audio_device = "none";
#endif
#ifndef CONFIG_VIDEO4LINUX
const char *v4l_device = "none";
#endif

typedef struct AVOutputStream {
int file_index; /* file index */
@@ -1870,7 +1870,7 @@ void opt_audio_channels(const char *arg)

void opt_video_device(const char *arg)
{
v4l_device = strdup(arg);
video_device = strdup(arg);
}

void opt_audio_device(const char *arg)
@@ -1878,6 +1878,12 @@ void opt_audio_device(const char *arg)
audio_device = strdup(arg);
}

void opt_dv1394(const char *arg)
{
video_grab_format = "dv1394";
audio_grab_format = "none";
}

void opt_audio_codec(const char *arg)
{
AVCodec *p;
@@ -2455,7 +2461,7 @@ void prepare_grab(void)
if (has_video) {
AVInputFormat *fmt1;
fmt1 = av_find_input_format("video_grab_device");
fmt1 = av_find_input_format(video_grab_format);
if (av_open_input_file(&ic, "", fmt1, 0, ap) < 0) {
fprintf(stderr, "Could not find video grab device\n");
exit(1);
@@ -2463,12 +2469,12 @@ void prepare_grab(void)
/* by now video grab has one stream */
ic->streams[0]->r_frame_rate = ap->frame_rate;
input_files[nb_input_files] = ic;
dump_format(ic, nb_input_files, v4l_device, 0);
dump_format(ic, nb_input_files, video_device, 0);
nb_input_files++;
}
if (has_audio) {
AVInputFormat *fmt1;
fmt1 = av_find_input_format("audio_device");
fmt1 = av_find_input_format(audio_grab_format);
if (av_open_input_file(&ic, "", fmt1, 0, ap) < 0) {
fprintf(stderr, "Could not find audio grab device\n");
exit(1);
@@ -2692,6 +2698,7 @@ const OptionDef options[] = {
{ "minrate", HAS_ARG, {(void*)opt_video_bitrate_min}, "set min video bitrate tolerance (in kbit/s)", "bitrate" },
{ "bufsize", HAS_ARG, {(void*)opt_video_buffer_size}, "set ratecontrol buffere size (in kbit)", "size" },
{ "vd", HAS_ARG | OPT_EXPERT, {(void*)opt_video_device}, "set video grab device", "device" },
{ "dv1394", OPT_EXPERT, {(void*)opt_dv1394}, "set DV1394 options", "[channel]" },
{ "vcodec", HAS_ARG | OPT_EXPERT, {(void*)opt_video_codec}, "force video codec ('copy' to copy stream)", "codec" },
{ "me", HAS_ARG | OPT_EXPERT, {(void*)opt_motion_estimation}, "set motion estimation method",
"method" },


+ 4
- 0
libavformat/Makefile View File

@@ -28,6 +28,10 @@ ifeq ($(CONFIG_VIDEO4LINUX),yes)
OBJS+= grab.o
endif

ifeq ($(CONFIG_DV1394),yes)
OBJS+= dv1394.o
endif

ifeq ($(CONFIG_AUDIO_OSS),yes)
OBJS+= audio.o
endif


+ 6
- 0
libavformat/allformats.c View File

@@ -21,6 +21,8 @@
/* If you do not call this function, then you can select exactly which
formats you want to support */

char *video_device = "none";

/**
* Initialize libavcodec and register all the codecs and formats.
*/
@@ -62,6 +64,10 @@ void av_register_all(void)
audio_init();
#endif

#ifdef CONFIG_DV1394
dv1394_init();
#endif

/* image formats */
av_register_image_format(&pnm_image_format);
av_register_image_format(&pbm_image_format);


+ 249
- 0
libavformat/dv1394.c View File

@@ -0,0 +1,249 @@
/*
* Linux DV1394 interface
* Copyright (c) 2003 Max Krasnyansky <maxk@qualcomm.com>
*
* 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
*/

#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/poll.h>
#include <sys/time.h>
#include <time.h>

#include "avformat.h"

#undef DV1394_DEBUG

#include "dv1394.h"

int dv1394_channel = DV1394_DEFAULT_CHANNEL;

struct dv1394_data {
int fd;
int channel;
int width, height;
int frame_rate;
int frame_size;

void *ring; /* Ring buffer */
int index; /* Current frame index */
int avail; /* Number of frames available for reading */
int done; /* Number of completed frames */
};

static int dv1394_reset(struct dv1394_data *dv)
{
struct dv1394_init init;

init.channel = dv->channel;
init.api_version = DV1394_API_VERSION;
init.n_frames = DV1394_RING_FRAMES;
init.format = DV1394_NTSC;

if (ioctl(dv->fd, DV1394_INIT, &init) < 0)
return -1;

dv->avail = 0;
return 0;
}

static int dv1394_start(struct dv1394_data *dv)
{
/* Tell DV1394 driver to enable receiver */
if (ioctl(dv->fd, DV1394_START_RECEIVE, 0) < 0) {
perror("Failed to start receiver");
return -1;
}
return 0;
}

static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap)
{
struct dv1394_data *dv = context->priv_data;
AVStream *st;

st = av_new_stream(context, 0);
if (!st)
return -ENOMEM;

dv->width = DV1394_WIDTH;
dv->height = DV1394_HEIGHT;
dv->channel = dv1394_channel;

dv->frame_rate = 30;

dv->frame_size = DV1394_NTSC_FRAME_SIZE;

/* Open and initialize DV1394 device */

dv->fd = open(video_device, O_RDONLY);
if (dv->fd < 0) {
perror("Failed to open DV interface");
goto failed;
}

if (dv1394_reset(dv) < 0) {
perror("Failed to initialize DV interface");
goto failed;
}

dv->ring = mmap(NULL, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES,
PROT_READ, MAP_PRIVATE, dv->fd, 0);
if (!dv->ring) {
perror("Failed to mmap DV ring buffer");
goto failed;
}

st->codec.codec_type = CODEC_TYPE_VIDEO;
st->codec.codec_id = CODEC_ID_DVVIDEO;
st->codec.width = dv->width;
st->codec.height = dv->height;
st->codec.frame_rate = dv->frame_rate * FRAME_RATE_BASE;

st->codec.bit_rate = 25000000; /* Consumer DV is 25Mbps */

av_set_pts_info(context, 48, 1, 1000000);

if (dv1394_start(dv) < 0)
goto failed;

return 0;

failed:
close(dv->fd);
av_free(st);
return -EIO;
}

static inline int __copy_frame(struct dv1394_data *dv, void *buf)
{
char *ptr = dv->ring + (dv->index * dv->frame_size);

memcpy(buf, ptr, dv->frame_size);

dv->index = (dv->index + 1) % DV1394_RING_FRAMES;
dv->avail--;
dv->done++;

return dv->frame_size;
}

static int dv1394_read_packet(AVFormatContext * context, AVPacket * pkt)
{
struct dv1394_data *dv = context->priv_data;
int len;

if (!dv->avail) {
struct dv1394_status s;
struct pollfd p;
p.fd = dv->fd;
p.events = POLLIN | POLLERR | POLLHUP;

/* Wait until more frames are available */
if (poll(&p, 1, -1) < 0) {
perror("Poll failed");
return -EIO;
}

if (ioctl(dv->fd, DV1394_GET_STATUS, &s) < 0) {
perror("Failed to get status");
return -EIO;
}
#ifdef DV1394_DEBUG
fprintf(stderr, "DV1394: status\n"
"\tactive_frame\t%d\n"
"\tfirst_clear_frame\t%d\n"
"\tn_clear_frames\t%d\n"
"\tdropped_frames\t%d\n",
s.active_frame, s.first_clear_frame,
s.n_clear_frames, s.dropped_frames);
#endif

dv->avail = s.n_clear_frames;
dv->index = s.first_clear_frame;
dv->done = 0;

if (s.dropped_frames) {
fprintf(stderr, "DV1394: Frame drop detected (%d). Reseting ..\n",
s.dropped_frames);

dv1394_reset(dv);
dv1394_start(dv);
}
}

if (av_new_packet(pkt, dv->frame_size) < 0)
return -EIO;

#ifdef DV1394_DEBUG
fprintf(stderr, "index %d, avail %d, done %d\n", dv->index, dv->avail,
dv->done);
#endif

len = __copy_frame(dv, pkt->data);
pkt->pts = av_gettime() & ((1LL << 48) - 1);

if (!dv->avail && dv->done) {
/* Request more frames */
if (ioctl(dv->fd, DV1394_RECEIVE_FRAMES, dv->done) < 0) {
/* This usually means that ring buffer overflowed.
* We have to reset :(.
*/

fprintf(stderr, "DV1394: Ring buffer overflow. Reseting ..\n");

dv1394_reset(dv);
dv1394_start(dv);
}
}

return len;
}

static int dv1394_close(AVFormatContext * context)
{
struct dv1394_data *dv = context->priv_data;

/* Shutdown DV1394 receiver */
if (ioctl(dv->fd, DV1394_SHUTDOWN, 0) < 0)
perror("Failed to shutdown DV1394");

/* Unmap ring buffer */
if (munmap(dv->ring, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES) < 0)
perror("Failed to munmap DV1394 ring buffer");

close(dv->fd);

return 0;
}

static AVInputFormat dv1394_format = {
.name = "dv1394",
.long_name = "dv1394 A/V grab",
.priv_data_size = sizeof(struct dv1394_data),
.read_header = dv1394_read_header,
.read_packet = dv1394_read_packet,
.read_close = dv1394_close,
.flags = AVFMT_NOFILE
};

int dv1394_init(void)
{
av_register_input_format(&dv1394_format);
return 0;
}

+ 353
- 0
libavformat/dv1394.h View File

@@ -0,0 +1,353 @@
/*
* 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 */

+ 3
- 5
libavformat/grab.c View File

@@ -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,


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