mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-14 03:04:53 +00:00
8066e59fa4
* generic DV demuxer now sets correct pts for every packet Originally committed as revision 2919 to svn://svn.ffmpeg.org/ffmpeg/trunk
245 lines
6.5 KiB
C
245 lines
6.5 KiB
C
/*
|
|
* 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 <errno.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"
|
|
#include "dv.h"
|
|
|
|
struct dv1394_data {
|
|
int fd;
|
|
int channel;
|
|
int format;
|
|
|
|
void *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) {
|
|
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;
|
|
const char *video_device;
|
|
|
|
dv->dv_demux = dv_init_demux(context);
|
|
if (!dv->dv_demux)
|
|
goto failed;
|
|
|
|
if (ap->standard && !strcasecmp(ap->standard, "pal"))
|
|
dv->format = DV1394_PAL;
|
|
else
|
|
dv->format = DV1394_NTSC;
|
|
|
|
if (ap->channel)
|
|
dv->channel = ap->channel;
|
|
else
|
|
dv->channel = DV1394_DEFAULT_CHANNEL;
|
|
|
|
/* Open and initialize DV1394 device */
|
|
video_device = ap->device;
|
|
if (!video_device)
|
|
video_device = "/dev/dv1394/0";
|
|
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_PAL_FRAME_SIZE * DV1394_RING_FRAMES,
|
|
PROT_READ, MAP_PRIVATE, dv->fd, 0);
|
|
if (dv->ring == MAP_FAILED) {
|
|
perror("Failed to mmap DV ring buffer");
|
|
goto failed;
|
|
}
|
|
|
|
if (dv1394_start(dv) < 0)
|
|
goto failed;
|
|
|
|
return 0;
|
|
|
|
failed:
|
|
close(dv->fd);
|
|
return -EIO;
|
|
}
|
|
|
|
static int dv1394_read_packet(AVFormatContext *context, AVPacket *pkt)
|
|
{
|
|
struct dv1394_data *dv = context->priv_data;
|
|
int size;
|
|
|
|
size = 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. Reseting ..\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;
|
|
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) {
|
|
av_log(context, AV_LOG_ERROR, "DV1394: Frame drop detected (%d). Reseting ..\n",
|
|
s.dropped_frames);
|
|
|
|
dv1394_reset(dv);
|
|
dv1394_start(dv);
|
|
}
|
|
}
|
|
|
|
#ifdef DV1394_DEBUG
|
|
fprintf(stderr, "index %d, avail %d, done %d\n", dv->index, dv->avail,
|
|
dv->done);
|
|
#endif
|
|
|
|
size = dv_produce_packet(dv->dv_demux, pkt,
|
|
dv->ring + (dv->index * DV1394_PAL_FRAME_SIZE),
|
|
DV1394_PAL_FRAME_SIZE);
|
|
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)
|
|
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);
|
|
av_free(dv->dv_demux);
|
|
|
|
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;
|
|
}
|