dv patch by Max Krasnyansky (maxk at qualcomm dot com)

Originally committed as revision 1493 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 249 insertions, 0 deletions

diff --git a/libavformat/dv1394.c b/libavformat/dv1394.c
new file mode 100644
index 0000000..8515160
--- /dev/null
+++ b/libavformat/dv1394.c
@@ -0,0 +1,249 @@
+/*
+ * 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 <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"
+
+int dv1394_channel = DV1394_DEFAULT_CHANNEL;
+
+struct dv1394_data {
+    int fd;
+    int channel;
+    int width, height;
+    int frame_rate;
+    int frame_size;
+
+    void *ring; /* Ring buffer */
+    int index;  /* Current frame index */
+    int avail;  /* Number of frames available for reading */
+    int done;   /* Number of completed frames */
+};
+
+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_NTSC;
+
+    if (ioctl(dv->fd, DV1394_INIT, &init) < 0)
+        return -1;
+
+    dv->avail = 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;
+    AVStream *st;
+
+    st = av_new_stream(context, 0);
+    if (!st)
+        return -ENOMEM;
+
+    dv->width   = DV1394_WIDTH;
+    dv->height  = DV1394_HEIGHT;
+    dv->channel = dv1394_channel;
+
+    dv->frame_rate = 30;
+
+    dv->frame_size = DV1394_NTSC_FRAME_SIZE;
+
+    /* Open and initialize DV1394 device */
+
+    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_NTSC_FRAME_SIZE * DV1394_RING_FRAMES,
+                    PROT_READ, MAP_PRIVATE, dv->fd, 0);
+    if (!dv->ring) {
+        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;
+
+    return 0;
+
+failed:
+    close(dv->fd);
+    av_free(st);
+    return -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)
+{
+    struct dv1394_data *dv = context->priv_data;
+    int len;
+
+    if (!dv->avail) {
+        struct dv1394_status s;
+        struct pollfd p;
+        p.fd = dv->fd;
+        p.events = POLLIN | POLLERR | POLLHUP;
+
+        /* Wait until more frames are available */
+        if (poll(&p, 1, -1) < 0) {
+            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) {
+            fprintf(stderr, "DV1394: Frame drop detected (%d). Reseting ..\n",
+                    s.dropped_frames);
+
+            dv1394_reset(dv);
+            dv1394_start(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,
+            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);
+        }
+    }
+
+    return len;
+}
+
+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);
+
+    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;
+}