static int dv1394_read_header(AVFormatContext * context, AVFormatParameters * ap) { struct dv1394_data *dv = context->priv_data; const char *video_device; 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 */ 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_PAL_FRAME_SIZE * DV1394_RING_FRAMES, PROT_READ, MAP_PRIVATE, dv->fd, 0); if (dv->ring == MAP_FAILED) { perror("Failed to mmap DV ring buffer"); goto failed; } if (dv1394_start(dv) < 0) goto failed; return 0; failed: close(dv->fd); return AVERROR_IO; }
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; perror("Poll failed"); return AVERROR(EIO); } if (ioctl(dv->fd, DV1394_GET_STATUS, &s) < 0) { perror("Failed to get status"); 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; }