* Linux DV1394 interface
* Copyright (c) 2003 Max Krasnyansky <maxk@qualcomm.com>
*
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * 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>
#undef DV1394_DEBUG
#include "dv1394.h"
-
-int dv1394_channel = DV1394_DEFAULT_CHANNEL;
+#include "dv.h"
struct dv1394_data {
int fd;
int channel;
- int width, height;
- int frame_rate;
- int frame_size;
+ int format;
- void *ring; /* Ring buffer */
+ 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.channel = dv->channel;
init.api_version = DV1394_API_VERSION;
- init.n_frames = DV1394_RING_FRAMES;
- init.format = DV1394_NTSC;
+ init.n_frames = DV1394_RING_FRAMES;
+ init.format = DV1394_PAL;
if (ioctl(dv->fd, DV1394_INIT, &init) < 0)
return -1;
- dv->avail = 0;
+ dv->avail = dv->done = 0;
return 0;
}
static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap)
{
struct dv1394_data *dv = context->priv_data;
- AVStream *st;
- const char *video_device;
- st = av_new_stream(context, 0);
- if (!st)
- return -ENOMEM;
-
- dv->width = DV1394_WIDTH;
- dv->height = DV1394_HEIGHT;
- dv->channel = ap->channel;
+ dv->dv_demux = dv_init_demux(context);
+ if (!dv->dv_demux)
+ goto failed;
- dv->frame_rate = 30;
+ if (ap->standard && !strcasecmp(ap->standard, "pal"))
+ dv->format = DV1394_PAL;
+ else
+ dv->format = DV1394_NTSC;
- dv->frame_size = DV1394_NTSC_FRAME_SIZE;
+ 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);
+ dv->fd = open(context->filename, O_RDONLY);
if (dv->fd < 0) {
perror("Failed to open DV interface");
goto failed;
goto failed;
}
- dv->ring = mmap(NULL, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES,
+ dv->ring = mmap(NULL, DV1394_PAL_FRAME_SIZE * DV1394_RING_FRAMES,
PROT_READ, MAP_PRIVATE, dv->fd, 0);
- if (!dv->ring) {
+ if (dv->ring == MAP_FAILED) {
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;
failed:
close(dv->fd);
- av_free(st);
- return -EIO;
+ return AVERROR(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)
+static int dv1394_read_packet(AVFormatContext *context, AVPacket *pkt)
{
struct dv1394_data *dv = context->priv_data;
- int len;
+ 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;
- p.fd = dv->fd;
- p.events = POLLIN | POLLERR | POLLHUP;
+
+ 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;
+ return AVERROR(EIO);
}
if (ioctl(dv->fd, DV1394_GET_STATUS, &s) < 0) {
perror("Failed to get status");
- return -EIO;
+ return AVERROR(EIO);
}
#ifdef DV1394_DEBUG
- fprintf(stderr, "DV1394: status\n"
+ 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"
dv->avail = s.n_clear_frames;
dv->index = s.first_clear_frame;
- dv->done = 0;
+ dv->done = 0;
if (s.dropped_frames) {
- fprintf(stderr, "DV1394: Frame drop detected (%d). Reseting ..\n",
+ av_log(context, AV_LOG_ERROR, "DV1394: Frame drop detected (%d). Reseting ..\n",
s.dropped_frames);
dv1394_reset(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,
+ av_log(context, AV_LOG_DEBUG, "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);
- }
- }
+ 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 len;
+ return size;
}
static int dv1394_close(AVFormatContext * context)
perror("Failed to munmap DV1394 ring buffer");
close(dv->fd);
+ av_free(dv->dv_demux);
return 0;
}
-static AVInputFormat dv1394_format = {
+AVInputFormat dv1394_demuxer = {
.name = "dv1394",
.long_name = "dv1394 A/V grab",
.priv_data_size = sizeof(struct dv1394_data),
.read_close = dv1394_close,
.flags = AVFMT_NOFILE
};
-
-int dv1394_init(void)
-{
- av_register_input_format(&dv1394_format);
- return 0;
-}
projects / ffmpeg / blobdiff