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

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

File Facts

System
Linux kernel
Corpus path
drivers/media/pci/ivtv/ivtv-controls.c
Extension
.c
Size
4497 bytes
Lines
154
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: implementation source
Status
source 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 (itv->vbi.sliced_mpeg_data[i] == NULL) {
				while (--i >= 0) {
					kfree(itv->vbi.sliced_mpeg_data[i]);
					itv->vbi.sliced_mpeg_data[i] = NULL;
				}
				return -ENOMEM;
			}
		}
	}

	itv->vbi.insert_mpeg = fmt;

	if (itv->vbi.insert_mpeg == 0) {
		return 0;
	}
	/* Need sliced data for mpeg insertion */
	if (ivtv_get_service_set(itv->vbi.sliced_in) == 0) {
		if (itv->is_60hz)
			itv->vbi.sliced_in->service_set = V4L2_SLICED_CAPTION_525;
		else
			itv->vbi.sliced_in->service_set = V4L2_SLICED_WSS_625;
		ivtv_expand_service_set(itv->vbi.sliced_in, itv->is_50hz);
	}
	return 0;
}

static int ivtv_s_video_encoding(struct cx2341x_handler *cxhdl, u32 val)
{
	struct ivtv *itv = container_of(cxhdl, struct ivtv, cxhdl);
	int is_mpeg1 = val == V4L2_MPEG_VIDEO_ENCODING_MPEG_1;
	struct v4l2_subdev_format format = {
		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
	};

	/* fix videodecoder resolution */
	format.format.width = cxhdl->width / (is_mpeg1 ? 2 : 1);
	format.format.height = cxhdl->height;
	format.format.code = MEDIA_BUS_FMT_FIXED;
	v4l2_subdev_call(itv->sd_video, pad, set_fmt, NULL, &format);
	return 0;
}

static int ivtv_s_audio_sampling_freq(struct cx2341x_handler *cxhdl, u32 idx)
{
	static const u32 freqs[3] = { 44100, 48000, 32000 };
	struct ivtv *itv = container_of(cxhdl, struct ivtv, cxhdl);

	/* The audio clock of the digitizer must match the codec sample
	   rate otherwise you get some very strange effects. */
	if (idx < ARRAY_SIZE(freqs))
		ivtv_call_all(itv, audio, s_clock_freq, freqs[idx]);
	return 0;
}

static int ivtv_s_audio_mode(struct cx2341x_handler *cxhdl, u32 val)
{
	struct ivtv *itv = container_of(cxhdl, struct ivtv, cxhdl);

	itv->dualwatch_stereo_mode = val;
	return 0;
}

const struct cx2341x_handler_ops ivtv_cxhdl_ops = {
	.s_audio_mode = ivtv_s_audio_mode,
	.s_audio_sampling_freq = ivtv_s_audio_sampling_freq,
	.s_video_encoding = ivtv_s_video_encoding,
	.s_stream_vbi_fmt = ivtv_s_stream_vbi_fmt,
};

int ivtv_g_pts_frame(struct ivtv *itv, s64 *pts, s64 *frame)
{
	u32 data[CX2341X_MBOX_MAX_DATA];

	if (test_bit(IVTV_F_I_VALID_DEC_TIMINGS, &itv->i_flags)) {
		*pts = (s64)((u64)itv->last_dec_timing[2] << 32) |
			(u64)itv->last_dec_timing[1];
		*frame = itv->last_dec_timing[0];
		return 0;
	}
	*pts = 0;
	*frame = 0;
	if (atomic_read(&itv->decoding)) {
		if (ivtv_api(itv, CX2341X_DEC_GET_TIMING_INFO, 5, data)) {
			IVTV_DEBUG_WARN("GET_TIMING: couldn't read clock\n");
			return -EIO;
		}
		memcpy(itv->last_dec_timing, data, sizeof(itv->last_dec_timing));
		set_bit(IVTV_F_I_VALID_DEC_TIMINGS, &itv->i_flags);
		*pts = (s64)((u64) data[2] << 32) | (u64) data[1];
		*frame = data[0];

Annotation

Implementation Notes