293 lines
7.5 KiB
C
293 lines
7.5 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 library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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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 <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/poll.h>
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#include <sys/time.h>
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#include <time.h>
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#include "avformat.h"
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#undef DV1394_DEBUG
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#include "dv1394.h"
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struct dv1394_data {
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int fd;
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int channel;
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int width, height;
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int frame_rate;
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int frame_size;
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int format;
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void *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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int stream; /* Current stream. 0 - video, 1 - audio */
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int64_t pts; /* Current timestamp */
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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 = dv->format;
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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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dv->stream = 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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perror("Failed to start receiver");
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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, AVFormatParameters * ap)
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{
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struct dv1394_data *dv = context->priv_data;
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AVStream *vst, *ast;
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const char *video_device;
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vst = av_new_stream(context, 0);
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if (!vst)
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return -ENOMEM;
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ast = av_new_stream(context, 1);
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if (!ast) {
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av_free(vst);
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return -ENOMEM;
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}
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dv->width = DV1394_WIDTH;
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dv->height = DV1394_HEIGHT;
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if (ap->channel)
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dv->channel = ap->channel;
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else
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dv->channel = DV1394_DEFAULT_CHANNEL;
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/* FIXME: Need a format change parameter */
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dv->format = DV1394_NTSC;
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if (dv->format == DV1394_NTSC) {
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dv->frame_size = DV1394_NTSC_FRAME_SIZE;
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dv->frame_rate = 30;
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} else {
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dv->frame_size = DV1394_PAL_FRAME_SIZE;
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dv->frame_rate = 25;
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}
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/* Open and initialize DV1394 device */
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video_device = ap->device;
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if (!video_device)
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video_device = "/dev/dv1394/0";
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dv->fd = open(video_device, O_RDONLY);
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if (dv->fd < 0) {
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perror("Failed to open DV interface");
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goto failed;
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}
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if (dv1394_reset(dv) < 0) {
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perror("Failed to initialize DV interface");
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goto failed;
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}
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dv->ring = mmap(NULL, DV1394_NTSC_FRAME_SIZE * DV1394_RING_FRAMES,
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PROT_READ, MAP_PRIVATE, dv->fd, 0);
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if (!dv->ring) {
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perror("Failed to mmap DV ring buffer");
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goto failed;
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}
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dv->stream = 0;
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vst->codec.codec_type = CODEC_TYPE_VIDEO;
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vst->codec.codec_id = CODEC_ID_DVVIDEO;
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vst->codec.width = dv->width;
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vst->codec.height = dv->height;
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vst->codec.frame_rate = dv->frame_rate * FRAME_RATE_BASE;
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vst->codec.bit_rate = 25000000; /* Consumer DV is 25Mbps */
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ast->codec.codec_type = CODEC_TYPE_AUDIO;
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ast->codec.codec_id = CODEC_ID_DVAUDIO;
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ast->codec.channels = 2;
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ast->codec.sample_rate= 48000;
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av_set_pts_info(context, 48, 1, 1000000);
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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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av_free(vst);
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av_free(ast);
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return -EIO;
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}
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static void __destruct_pkt(struct AVPacket *pkt)
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{
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pkt->data = NULL; pkt->size = 0;
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return;
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}
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static inline int __get_frame(struct dv1394_data *dv, AVPacket *pkt)
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{
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char *ptr = dv->ring + (dv->index * dv->frame_size);
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if (dv->stream) {
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dv->index = (dv->index + 1) % DV1394_RING_FRAMES;
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dv->done++; dv->avail--;
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} else {
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dv->pts = av_gettime() & ((1LL << 48) - 1);
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}
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av_init_packet(pkt);
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pkt->destruct = __destruct_pkt;
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pkt->data = ptr;
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pkt->size = dv->frame_size;
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pkt->pts = dv->pts;
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pkt->stream_index = dv->stream;
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dv->stream ^= 1;
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return dv->frame_size;
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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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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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fprintf(stderr, "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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perror("Poll failed");
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return -EIO;
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}
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if (ioctl(dv->fd, DV1394_GET_STATUS, &s) < 0) {
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perror("Failed to get status");
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return -EIO;
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}
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#ifdef DV1394_DEBUG
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fprintf(stderr, "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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#endif
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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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fprintf(stderr, "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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#ifdef DV1394_DEBUG
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fprintf(stderr, "index %d, avail %d, done %d\n", dv->index, dv->avail,
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dv->done);
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#endif
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return __get_frame(dv, pkt);
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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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perror("Failed to shutdown DV1394");
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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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perror("Failed to munmap DV1394 ring buffer");
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close(dv->fd);
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return 0;
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}
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static AVInputFormat dv1394_format = {
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.name = "dv1394",
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.long_name = "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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};
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int dv1394_init(void)
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{
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av_register_input_format(&dv1394_format);
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return 0;
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}
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