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![Michael Niedermayer](/assets/img/avatar_default.png)
DV1394_NTSC has a lower value than DV1394_PAL. Signed-off-by: Martin Storsjö <martin@martin.st>
238 lines
7.3 KiB
C
238 lines
7.3 KiB
C
/*
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* Linux DV1394 interface
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* Copyright (c) 2003 Max Krasnyansky <maxk@qualcomm.com>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <poll.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include "libavutil/log.h"
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#include "libavutil/opt.h"
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#include "libavformat/avformat.h"
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#include "libavformat/dv.h"
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#include "dv1394.h"
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struct dv1394_data {
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AVClass *class;
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int fd;
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int channel;
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int format;
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uint8_t *ring; /* Ring buffer */
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int index; /* Current frame index */
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int avail; /* Number of frames available for reading */
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int done; /* Number of completed frames */
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DVDemuxContext* dv_demux; /* Generic DV muxing/demuxing context */
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};
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/*
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* The trick here is to kludge around well known problem with kernel Ooopsing
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* when you try to capture PAL on a device node configure for NTSC. That's
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* why we have to configure the device node for PAL, and then read only NTSC
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* amount of data.
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*/
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static int dv1394_reset(struct dv1394_data *dv)
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{
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struct dv1394_init init;
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init.channel = dv->channel;
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init.api_version = DV1394_API_VERSION;
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init.n_frames = DV1394_RING_FRAMES;
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init.format = DV1394_PAL;
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if (ioctl(dv->fd, DV1394_INIT, &init) < 0)
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return -1;
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dv->avail = dv->done = 0;
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return 0;
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}
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static int dv1394_start(struct dv1394_data *dv)
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{
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/* Tell DV1394 driver to enable receiver */
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if (ioctl(dv->fd, DV1394_START_RECEIVE, 0) < 0) {
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av_log(NULL, AV_LOG_ERROR, "Failed to start receiver: %s\n", strerror(errno));
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return -1;
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}
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return 0;
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}
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static int dv1394_read_header(AVFormatContext * context)
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{
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struct dv1394_data *dv = context->priv_data;
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dv->dv_demux = avpriv_dv_init_demux(context);
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if (!dv->dv_demux)
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goto failed;
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/* Open and initialize DV1394 device */
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dv->fd = open(context->filename, O_RDONLY);
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if (dv->fd < 0) {
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av_log(context, AV_LOG_ERROR, "Failed to open DV interface: %s\n", strerror(errno));
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goto failed;
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}
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if (dv1394_reset(dv) < 0) {
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av_log(context, AV_LOG_ERROR, "Failed to initialize DV interface: %s\n", strerror(errno));
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goto failed;
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}
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dv->ring = mmap(NULL, DV1394_PAL_FRAME_SIZE * DV1394_RING_FRAMES,
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PROT_READ, MAP_PRIVATE, dv->fd, 0);
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if (dv->ring == MAP_FAILED) {
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av_log(context, AV_LOG_ERROR, "Failed to mmap DV ring buffer: %s\n", strerror(errno));
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goto failed;
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}
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if (dv1394_start(dv) < 0)
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goto failed;
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return 0;
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failed:
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close(dv->fd);
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return AVERROR(EIO);
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}
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static int dv1394_read_packet(AVFormatContext *context, AVPacket *pkt)
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{
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struct dv1394_data *dv = context->priv_data;
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int size;
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size = avpriv_dv_get_packet(dv->dv_demux, pkt);
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if (size > 0)
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return size;
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if (!dv->avail) {
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struct dv1394_status s;
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struct pollfd p;
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if (dv->done) {
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/* Request more frames */
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if (ioctl(dv->fd, DV1394_RECEIVE_FRAMES, dv->done) < 0) {
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/* This usually means that ring buffer overflowed.
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* We have to reset :(.
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*/
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av_log(context, AV_LOG_ERROR, "DV1394: Ring buffer overflow. Reseting ..\n");
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dv1394_reset(dv);
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dv1394_start(dv);
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}
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dv->done = 0;
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}
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/* Wait until more frames are available */
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restart_poll:
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p.fd = dv->fd;
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p.events = POLLIN | POLLERR | POLLHUP;
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if (poll(&p, 1, -1) < 0) {
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if (errno == EAGAIN || errno == EINTR)
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goto restart_poll;
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av_log(context, AV_LOG_ERROR, "Poll failed: %s\n", strerror(errno));
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return AVERROR(EIO);
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}
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if (ioctl(dv->fd, DV1394_GET_STATUS, &s) < 0) {
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av_log(context, AV_LOG_ERROR, "Failed to get status: %s\n", strerror(errno));
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return AVERROR(EIO);
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}
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av_dlog(context, "DV1394: status\n"
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"\tactive_frame\t%d\n"
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"\tfirst_clear_frame\t%d\n"
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"\tn_clear_frames\t%d\n"
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"\tdropped_frames\t%d\n",
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s.active_frame, s.first_clear_frame,
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s.n_clear_frames, s.dropped_frames);
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dv->avail = s.n_clear_frames;
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dv->index = s.first_clear_frame;
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dv->done = 0;
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if (s.dropped_frames) {
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av_log(context, AV_LOG_ERROR, "DV1394: Frame drop detected (%d). Reseting ..\n",
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s.dropped_frames);
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dv1394_reset(dv);
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dv1394_start(dv);
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}
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}
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av_dlog(context, "index %d, avail %d, done %d\n", dv->index, dv->avail,
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dv->done);
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size = avpriv_dv_produce_packet(dv->dv_demux, pkt,
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dv->ring + (dv->index * DV1394_PAL_FRAME_SIZE),
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DV1394_PAL_FRAME_SIZE);
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dv->index = (dv->index + 1) % DV1394_RING_FRAMES;
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dv->done++; dv->avail--;
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return size;
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}
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static int dv1394_close(AVFormatContext * context)
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{
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struct dv1394_data *dv = context->priv_data;
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/* Shutdown DV1394 receiver */
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if (ioctl(dv->fd, DV1394_SHUTDOWN, 0) < 0)
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av_log(context, AV_LOG_ERROR, "Failed to shutdown DV1394: %s\n", strerror(errno));
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/* Unmap ring buffer */
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if (munmap(dv->ring, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES) < 0)
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av_log(context, AV_LOG_ERROR, "Failed to munmap DV1394 ring buffer: %s\n", strerror(errno));
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close(dv->fd);
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av_free(dv->dv_demux);
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return 0;
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}
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static const AVOption options[] = {
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{ "standard", "", offsetof(struct dv1394_data, format), AV_OPT_TYPE_INT, {.i64 = DV1394_NTSC}, DV1394_NTSC, DV1394_PAL, AV_OPT_FLAG_DECODING_PARAM, "standard" },
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{ "PAL", "", 0, AV_OPT_TYPE_CONST, {.i64 = DV1394_PAL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
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{ "NTSC", "", 0, AV_OPT_TYPE_CONST, {.i64 = DV1394_NTSC}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
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{ "channel", "", offsetof(struct dv1394_data, channel), AV_OPT_TYPE_INT, {.i64 = DV1394_DEFAULT_CHANNEL}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
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{ NULL },
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};
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static const AVClass dv1394_class = {
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.class_name = "DV1394 indev",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVInputFormat ff_dv1394_demuxer = {
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.name = "dv1394",
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.long_name = NULL_IF_CONFIG_SMALL("DV1394 A/V grab"),
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.priv_data_size = sizeof(struct dv1394_data),
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.read_header = dv1394_read_header,
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.read_packet = dv1394_read_packet,
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.read_close = dv1394_close,
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.flags = AVFMT_NOFILE,
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.priv_class = &dv1394_class,
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};
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