0,0 → 1,238 |
/* |
* Linux DV1394 interface |
* Copyright (c) 2003 Max Krasnyansky <maxk@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. 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; |
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_dlog(context, "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). Reseting ..\n", |
s.dropped_frames); |
|
dv1394_reset(dv); |
dv1394_start(dv); |
} |
} |
|
av_dlog(context, "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_free(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, |
}; |
|
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, |
}; |