Introduce libavdevice

Originally committed as revision 11077 to svn://svn.ffmpeg.org/ffmpeg/trunk

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
+};