drivers/media/pci/ivtv/ivtv-streams.c

Source file repositories/reference/linux-study-clean/drivers/media/pci/ivtv/ivtv-streams.c

File Facts

System
Linux kernel
Corpus path
drivers/media/pci/ivtv/ivtv-streams.c
Extension
.c
Size
30116 bytes
Lines
1027
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (raw) {
			data[3] = 0x20602060;
			data[4] = 0x30703070;
		} else {
			data[3] = 0xB0F0B0F0;
			data[4] = 0xA0E0A0E0;
		}
		/* Lines per frame */
		data[5] = lines;
		/* bytes per line */
		data[6] = (raw ? itv->vbi.raw_size : itv->vbi.sliced_size);
	} else {
		/* Setup VBI for the saa7115 digitizer */
		if (raw) {
			data[3] = 0x25256262;
			data[4] = 0x387F7F7F;
		} else {
			data[3] = 0xABABECEC;
			data[4] = 0xB6F1F1F1;
		}
		/* Lines per frame */
		data[5] = lines;
		/* bytes per line */
		data[6] = itv->vbi.enc_size / lines;
	}

	IVTV_DEBUG_INFO(
		"Setup VBI API header 0x%08x pkts %d buffs %d ln %d sz %d\n",
			data[0], data[1], data[2], data[5], data[6]);

	ivtv_api(itv, CX2341X_ENC_SET_VBI_CONFIG, 7, data);

	/* returns the VBI encoder memory area. */
	itv->vbi.enc_start = data[2];
	itv->vbi.fpi = data[0];
	if (!itv->vbi.fpi)
		itv->vbi.fpi = 1;

	IVTV_DEBUG_INFO("Setup VBI start 0x%08x frames %d fpi %d\n",
		itv->vbi.enc_start, data[1], itv->vbi.fpi);

	/* select VBI lines.
	   Note that the sliced argument seems to have no effect. */
	for (i = 2; i <= 24; i++) {
		int valid;

		if (itv->is_60hz) {
			valid = i >= 10 && i < 22;
		} else {
			valid = i >= 6 && i < 24;
		}
		ivtv_vapi(itv, CX2341X_ENC_SET_VBI_LINE, 5, i - 1,
				valid, 0 , 0, 0);
		ivtv_vapi(itv, CX2341X_ENC_SET_VBI_LINE, 5, (i - 1) | 0x80000000,
				valid, 0, 0, 0);
	}

	/* Remaining VBI questions:
	   - Is it possible to select particular VBI lines only for inclusion in the MPEG
	   stream? Currently you can only get the first X lines.
	   - Is mixed raw and sliced VBI possible?
	   - What's the meaning of the raw/sliced flag?
	   - What's the meaning of params 2, 3 & 4 of the Select VBI command? */
}

int ivtv_start_v4l2_encode_stream(struct ivtv_stream *s)
{
	u32 data[CX2341X_MBOX_MAX_DATA];
	struct ivtv *itv = s->itv;
	int captype = 0, subtype = 0;
	int enable_passthrough = 0;

	if (s->vdev.v4l2_dev == NULL)
		return -EINVAL;

	IVTV_DEBUG_INFO("Start encoder stream %s\n", s->name);

	switch (s->type) {
	case IVTV_ENC_STREAM_TYPE_MPG:
		captype = 0;
		subtype = 3;

		/* Stop Passthrough */
		if (itv->output_mode == OUT_PASSTHROUGH) {
			ivtv_passthrough_mode(itv, 0);
			enable_passthrough = 1;
		}
		itv->mpg_data_received = itv->vbi_data_inserted = 0;
		itv->dualwatch_jiffies = jiffies;
		itv->dualwatch_stereo_mode = v4l2_ctrl_g_ctrl(itv->cxhdl.audio_mode);

Annotation

Implementation Notes