summaryrefslogtreecommitdiff
path: root/libavdevice/dv1394.c
diff options
context:
space:
mode:
Diffstat (limited to 'libavdevice/dv1394.c')
-rw-r--r--libavdevice/dv1394.c236
1 files changed, 236 insertions, 0 deletions
diff --git a/libavdevice/dv1394.c b/libavdevice/dv1394.c
new file mode 100644
index 0000000000..8e2e2f607c
--- /dev/null
+++ b/libavdevice/dv1394.c
@@ -0,0 +1,236 @@
+/*
+ * 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 <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;
+
+ 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, AVFormatParameters * ap)
+{
+ struct dv1394_data *dv = context->priv_data;
+
+ 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 */
+ dv->fd = 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 = 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);
+ }
+#ifdef DV1394_DEBUG
+ av_log(context, AV_LOG_DEBUG, "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
+ av_log(context, AV_LOG_DEBUG, "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)
+ 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;
+}
+
+AVInputFormat dv1394_demuxer = {
+ .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
+};