[FFmpeg-cvslog] lavd: remove deprecated dv1394 device
Josh de Kock
git at videolan.org
Wed Sep 27 19:08:52 EEST 2017
ffmpeg | branch: master | Josh de Kock <josh at itanimul.li> | Tue Sep 26 15:49:18 2017 +0100| [56d2154b72fba96a65b806ecf4a6f85c3f69b021] | committer: Josh de Kock
lavd: remove deprecated dv1394 device
Support for this device has been removed in kernel since v2.6.37. dv1394 has been superseded by libiec61883 which is functionally equivalent.
Signed-off-by: Josh de Kock <josh at itanimul.li>
Signed-off-by: wm4 <nfxjfg at googlemail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=56d2154b72fba96a65b806ecf4a6f85c3f69b021
---
configure | 3 -
doc/indevs.texi | 25 ----
libavdevice/Makefile | 1 -
libavdevice/alldevices.c | 1 -
libavdevice/dv1394.c | 239 -------------------------------
libavdevice/dv1394.h | 357 -----------------------------------------------
6 files changed, 626 deletions(-)
diff --git a/configure b/configure
index 2cd727ea2f..a168feea23 100755
--- a/configure
+++ b/configure
@@ -3075,8 +3075,6 @@ libndi_newtek_outdev_deps="libndi_newtek"
libndi_newtek_outdev_extralibs="-lndi"
dshow_indev_deps="IBaseFilter"
dshow_indev_extralibs="-lpsapi -lole32 -lstrmiids -luuid -loleaut32 -lshlwapi"
-dv1394_indev_deps="dv1394"
-dv1394_indev_select="dv_demuxer"
fbdev_indev_deps="linux_fb_h"
fbdev_outdev_deps="linux_fb_h"
gdigrab_indev_deps="CreateDIBSection"
@@ -5062,7 +5060,6 @@ case $target_os in
add_cppflags -U__STRICT_ANSI__
;;
linux)
- enable dv1394
enable section_data_rel_ro
enabled_any arm aarch64 && enable_weak linux_perf
;;
diff --git a/doc/indevs.texi b/doc/indevs.texi
index 30b7ac2380..776e563160 100644
--- a/doc/indevs.texi
+++ b/doc/indevs.texi
@@ -641,31 +641,6 @@ $ ffmpeg -f dshow -show_video_device_dialog true -crossbar_video_input_pin_numbe
@end itemize
- at section dv1394
-
-Linux DV 1394 input device.
-
- at subsection Options
-
- at table @option
-
- at item framerate
-Set the frame rate. Default is 25.
-
- at item standard
-
-Available values are:
- at table @samp
- at item pal
-
- at item ntsc
-
- at end table
-
-Default value is @code{ntsc}.
-
- at end table
-
@section fbdev
Linux framebuffer input device.
diff --git a/libavdevice/Makefile b/libavdevice/Makefile
index f40f4d5298..8228d62147 100644
--- a/libavdevice/Makefile
+++ b/libavdevice/Makefile
@@ -24,7 +24,6 @@ OBJS-$(CONFIG_LIBNDI_NEWTEK_INDEV) += libndi_newtek_dec.o
OBJS-$(CONFIG_DSHOW_INDEV) += dshow_crossbar.o dshow.o dshow_enummediatypes.o \
dshow_enumpins.o dshow_filter.o \
dshow_pin.o dshow_common.o
-OBJS-$(CONFIG_DV1394_INDEV) += dv1394.o
OBJS-$(CONFIG_FBDEV_INDEV) += fbdev_dec.o \
fbdev_common.o
OBJS-$(CONFIG_FBDEV_OUTDEV) += fbdev_enc.o \
diff --git a/libavdevice/alldevices.c b/libavdevice/alldevices.c
index b31558bcb5..b767b6a718 100644
--- a/libavdevice/alldevices.c
+++ b/libavdevice/alldevices.c
@@ -48,7 +48,6 @@ static void register_all(void)
REGISTER_INOUTDEV(DECKLINK, decklink);
REGISTER_INOUTDEV(LIBNDI_NEWTEK, libndi_newtek);
REGISTER_INDEV (DSHOW, dshow);
- REGISTER_INDEV (DV1394, dv1394);
REGISTER_INOUTDEV(FBDEV, fbdev);
REGISTER_INDEV (GDIGRAB, gdigrab);
REGISTER_INDEV (IEC61883, iec61883);
diff --git a/libavdevice/dv1394.c b/libavdevice/dv1394.c
deleted file mode 100644
index c3483010fa..0000000000
--- a/libavdevice/dv1394.c
+++ /dev/null
@@ -1,239 +0,0 @@
-/*
- * Linux DV1394 interface
- * Copyright (c) 2003 Max Krasnyansky <maxk at qualcomm.com>
- *
- * 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 "config.h"
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <poll.h>
-#include <sys/ioctl.h>
-#include <sys/mman.h>
-
-#include "libavutil/internal.h"
-#include "libavutil/log.h"
-#include "libavutil/opt.h"
-#include "avdevice.h"
-#include "libavformat/dv.h"
-#include "dv1394.h"
-
-struct dv1394_data {
- AVClass *class;
- int fd;
- int channel;
- int format;
-
- uint8_t *ring; /* Ring buffer */
- int index; /* Current frame index */
- int avail; /* Number of frames available for reading */
- int done; /* Number of completed frames */
-
- DVDemuxContext* dv_demux; /* Generic DV muxing/demuxing context */
-};
-
-/*
- * The trick here is to kludge around well known problem with kernel Ooopsing
- * when you try to capture PAL on a device node configure for NTSC. That's
- * why we have to configure the device node for PAL, and then read only NTSC
- * amount of data.
- */
-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_PAL;
-
- if (ioctl(dv->fd, DV1394_INIT, &init) < 0)
- return -1;
-
- dv->avail = dv->done = 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) {
- av_log(NULL, AV_LOG_ERROR, "Failed to start receiver: %s\n", strerror(errno));
- return -1;
- }
- return 0;
-}
-
-static int dv1394_read_header(AVFormatContext * context)
-{
- struct dv1394_data *dv = context->priv_data;
-
- dv->dv_demux = avpriv_dv_init_demux(context);
- if (!dv->dv_demux)
- goto failed;
-
- /* Open and initialize DV1394 device */
- dv->fd = avpriv_open(context->filename, O_RDONLY);
- if (dv->fd < 0) {
- av_log(context, AV_LOG_ERROR, "Failed to open DV interface: %s\n", strerror(errno));
- goto failed;
- }
-
- if (dv1394_reset(dv) < 0) {
- av_log(context, AV_LOG_ERROR, "Failed to initialize DV interface: %s\n", strerror(errno));
- goto failed;
- }
-
- dv->ring = mmap(NULL, DV1394_PAL_FRAME_SIZE * DV1394_RING_FRAMES,
- PROT_READ, MAP_PRIVATE, dv->fd, 0);
- if (dv->ring == MAP_FAILED) {
- av_log(context, AV_LOG_ERROR, "Failed to mmap DV ring buffer: %s\n", strerror(errno));
- goto failed;
- }
-
- if (dv1394_start(dv) < 0)
- goto failed;
-
- return 0;
-
-failed:
- close(dv->fd);
- return AVERROR(EIO);
-}
-
-static int dv1394_read_packet(AVFormatContext *context, AVPacket *pkt)
-{
- struct dv1394_data *dv = context->priv_data;
- int size;
-
- size = avpriv_dv_get_packet(dv->dv_demux, pkt);
- if (size > 0)
- return size;
-
- if (!dv->avail) {
- struct dv1394_status s;
- struct pollfd p;
-
- if (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 :(.
- */
-
- av_log(context, AV_LOG_ERROR, "DV1394: Ring buffer overflow. Resetting ..\n");
-
- dv1394_reset(dv);
- dv1394_start(dv);
- }
- dv->done = 0;
- }
-
- /* Wait until more frames are available */
-restart_poll:
- p.fd = dv->fd;
- p.events = POLLIN | POLLERR | POLLHUP;
- if (poll(&p, 1, -1) < 0) {
- if (errno == EAGAIN || errno == EINTR)
- goto restart_poll;
- av_log(context, AV_LOG_ERROR, "Poll failed: %s\n", strerror(errno));
- return AVERROR(EIO);
- }
-
- if (ioctl(dv->fd, DV1394_GET_STATUS, &s) < 0) {
- av_log(context, AV_LOG_ERROR, "Failed to get status: %s\n", strerror(errno));
- return AVERROR(EIO);
- }
- av_log(context, AV_LOG_TRACE, "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);
-
- dv->avail = s.n_clear_frames;
- dv->index = s.first_clear_frame;
- dv->done = 0;
-
- if (s.dropped_frames) {
- av_log(context, AV_LOG_ERROR, "DV1394: Frame drop detected (%d). Resetting ..\n",
- s.dropped_frames);
-
- dv1394_reset(dv);
- dv1394_start(dv);
- }
- }
-
- av_log(context, AV_LOG_TRACE, "index %d, avail %d, done %d\n", dv->index, dv->avail,
- dv->done);
-
- size = avpriv_dv_produce_packet(dv->dv_demux, pkt,
- dv->ring + (dv->index * DV1394_PAL_FRAME_SIZE),
- DV1394_PAL_FRAME_SIZE, -1);
- dv->index = (dv->index + 1) % DV1394_RING_FRAMES;
- dv->done++; dv->avail--;
-
- return size;
-}
-
-static int dv1394_close(AVFormatContext * context)
-{
- struct dv1394_data *dv = context->priv_data;
-
- /* Shutdown DV1394 receiver */
- if (ioctl(dv->fd, DV1394_SHUTDOWN, 0) < 0)
- av_log(context, AV_LOG_ERROR, "Failed to shutdown DV1394: %s\n", strerror(errno));
-
- /* Unmap ring buffer */
- if (munmap(dv->ring, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES) < 0)
- av_log(context, AV_LOG_ERROR, "Failed to munmap DV1394 ring buffer: %s\n", strerror(errno));
-
- close(dv->fd);
- av_freep(&dv->dv_demux);
-
- return 0;
-}
-
-static const AVOption options[] = {
- { "standard", "", offsetof(struct dv1394_data, format), AV_OPT_TYPE_INT, {.i64 = DV1394_NTSC}, DV1394_NTSC, DV1394_PAL, AV_OPT_FLAG_DECODING_PARAM, "standard" },
- { "PAL", "", 0, AV_OPT_TYPE_CONST, {.i64 = DV1394_PAL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
- { "NTSC", "", 0, AV_OPT_TYPE_CONST, {.i64 = DV1394_NTSC}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
- { "channel", "", offsetof(struct dv1394_data, channel), AV_OPT_TYPE_INT, {.i64 = DV1394_DEFAULT_CHANNEL}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
- { NULL },
-};
-
-static const AVClass dv1394_class = {
- .class_name = "DV1394 indev",
- .item_name = av_default_item_name,
- .option = options,
- .version = LIBAVUTIL_VERSION_INT,
- .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
-};
-
-AVInputFormat ff_dv1394_demuxer = {
- .name = "dv1394",
- .long_name = NULL_IF_CONFIG_SMALL("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,
- .priv_class = &dv1394_class,
-};
diff --git a/libavdevice/dv1394.h b/libavdevice/dv1394.h
deleted file mode 100644
index b76d633ef6..0000000000
--- a/libavdevice/dv1394.h
+++ /dev/null
@@ -1,357 +0,0 @@
-/*
- * DV input/output over IEEE 1394 on OHCI chips
- * Copyright (C)2001 Daniel Maas <dmaas at dcine.com>
- * receive, proc_fs by Dan Dennedy <dan at dennedy.org>
- *
- * based on:
- * video1394.h - driver for OHCI 1394 boards
- * Copyright (C)1999,2000 Sebastien Rougeaux <sebastien.rougeaux at anu.edu.au>
- * Peter Schlaile <udbz at rz.uni-karlsruhe.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
- */
-
-#ifndef AVDEVICE_DV1394_H
-#define AVDEVICE_DV1394_H
-
-#define DV1394_DEFAULT_CHANNEL 63
-#define DV1394_DEFAULT_CARD 0
-#define DV1394_RING_FRAMES 20
-
-#define DV1394_WIDTH 720
-#define DV1394_NTSC_HEIGHT 480
-#define DV1394_PAL_HEIGHT 576
-
-/* 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 {
- int i;
- for (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 available (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 /* AVDEVICE_DV1394_H */
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