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ffmpeg/libavformat/dv1394.c

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/*
* 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 <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"
struct dv1394_data {
int fd;
int channel;
int width, height;
int frame_rate;
int frame_size;
int format;
void *ring; /* Ring buffer */
int index; /* Current frame index */
int avail; /* Number of frames available for reading */
int done; /* Number of completed frames */
int stream; /* Current stream. 0 - video, 1 - audio */
int64_t pts; /* Current timestamp */
};
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 = dv->format;
if (ioctl(dv->fd, DV1394_INIT, &init) < 0)
return -1;
dv->avail = dv->done = 0;
dv->stream = 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 *vst, *ast;
const char *video_device;
vst = av_new_stream(context, 0);
if (!vst)
return -ENOMEM;
ast = av_new_stream(context, 1);
if (!ast) {
av_free(vst);
return -ENOMEM;
}
dv->width = DV1394_WIDTH;
dv->height = DV1394_HEIGHT;
if (ap->channel)
dv->channel = ap->channel;
else
dv->channel = DV1394_DEFAULT_CHANNEL;
/* FIXME: Need a format change parameter */
dv->format = DV1394_NTSC;
if (dv->format == DV1394_NTSC) {
dv->frame_size = DV1394_NTSC_FRAME_SIZE;
dv->frame_rate = 30;
} else {
dv->frame_size = DV1394_PAL_FRAME_SIZE;
dv->frame_rate = 25;
}
/* Open and initialize DV1394 device */
video_device = ap->device;
if (!video_device)
video_device = "/dev/dv1394/0";
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;
}
dv->stream = 0;
vst->codec.codec_type = CODEC_TYPE_VIDEO;
vst->codec.codec_id = CODEC_ID_DVVIDEO;
vst->codec.width = dv->width;
vst->codec.height = dv->height;
vst->codec.frame_rate = dv->frame_rate * FRAME_RATE_BASE;
vst->codec.bit_rate = 25000000; /* Consumer DV is 25Mbps */
ast->codec.codec_type = CODEC_TYPE_AUDIO;
ast->codec.codec_id = CODEC_ID_DVAUDIO;
ast->codec.channels = 2;
ast->codec.sample_rate= 48000;
av_set_pts_info(context, 48, 1, 1000000);
if (dv1394_start(dv) < 0)
goto failed;
return 0;
failed:
close(dv->fd);
av_free(vst);
av_free(ast);
return -EIO;
}
static void __destruct_pkt(struct AVPacket *pkt)
{
pkt->data = NULL; pkt->size = 0;
return;
}
static inline int __get_frame(struct dv1394_data *dv, AVPacket *pkt)
{
char *ptr = dv->ring + (dv->index * dv->frame_size);
if (dv->stream) {
dv->index = (dv->index + 1) % DV1394_RING_FRAMES;
dv->done++; dv->avail--;
} else {
dv->pts = av_gettime() & ((1LL << 48) - 1);
}
av_init_packet(pkt);
pkt->destruct = __destruct_pkt;
pkt->data = ptr;
pkt->size = dv->frame_size;
pkt->pts = dv->pts;
pkt->stream_index = dv->stream;
dv->stream ^= 1;
return dv->frame_size;
}
static int dv1394_read_packet(AVFormatContext *context, AVPacket *pkt)
{
struct dv1394_data *dv = context->priv_data;
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 :(.
*/
fprintf(stderr, "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;
}
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);
}
}
#ifdef DV1394_DEBUG
fprintf(stderr, "index %d, avail %d, done %d\n", dv->index, dv->avail,
dv->done);
#endif
return __get_frame(dv, pkt);
}
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;
}
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