C++ (Cpp) hdmi_update_short_audio_desc示例

示例#1

文件： hda_eld.c 项目： 458941968/mini2440-kernel-2.6.29

/*
 * Be careful, ELD buf could be totally rubbish!
 */
static int hdmi_update_eld(struct hdmi_eld *e,
			   const unsigned char *buf, int size)
{
	int mnl;
	int i;

	e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
	if (e->eld_ver != ELD_VER_CEA_861D &&
	    e->eld_ver != ELD_VER_PARTIAL) {
		snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n",
								e->eld_ver);
		goto out_fail;
	}

	e->eld_size = size;
	e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
	mnl		= GRAB_BITS(buf, 4, 0, 5);
	e->cea_edid_ver	= GRAB_BITS(buf, 4, 5, 3);

	e->support_hdcp	= GRAB_BITS(buf, 5, 0, 1);
	e->support_ai	= GRAB_BITS(buf, 5, 1, 1);
	e->conn_type	= GRAB_BITS(buf, 5, 2, 2);
	e->sad_count	= GRAB_BITS(buf, 5, 4, 4);

	e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
	e->spk_alloc	= GRAB_BITS(buf, 7, 0, 7);

	e->port_id	  = get_unaligned_le64(buf + 8);

	/* not specified, but the spec's tendency is little endian */
	e->manufacture_id = get_unaligned_le16(buf + 16);
	e->product_id	  = get_unaligned_le16(buf + 18);

	if (mnl > ELD_MAX_MNL) {
		snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl);
		goto out_fail;
	} else if (ELD_FIXED_BYTES + mnl > size) {
		snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
		goto out_fail;
	} else
		strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl);

	for (i = 0; i < e->sad_count; i++) {
		if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
			snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i);
			goto out_fail;
		}
		hdmi_update_short_audio_desc(e->sad + i,
					buf + ELD_FIXED_BYTES + mnl + 3 * i);
	}

	return 0;

out_fail:
	e->eld_ver = 0;
	return -EINVAL;
}

示例#2

文件： hda_eld.c 项目： FrozenCow/FIRE-ICE

/*
 * Be careful, ELD buf could be totally rubbish!
 */
int snd_hdmi_parse_eld(struct parsed_hdmi_eld *e,
			  const unsigned char *buf, int size)
{
	int mnl;
	int i;

	e->eld_ver = GRAB_BITS(buf, 0, 3, 5);
	if (e->eld_ver != ELD_VER_CEA_861D &&
	    e->eld_ver != ELD_VER_PARTIAL) {
		snd_printd(KERN_INFO "HDMI: Unknown ELD version %d\n",
								e->eld_ver);
		goto out_fail;
	}

	e->baseline_len = GRAB_BITS(buf, 2, 0, 8);
	mnl		= GRAB_BITS(buf, 4, 0, 5);
	e->cea_edid_ver	= GRAB_BITS(buf, 4, 5, 3);

	e->support_hdcp	= GRAB_BITS(buf, 5, 0, 1);
	e->support_ai	= GRAB_BITS(buf, 5, 1, 1);
	e->conn_type	= GRAB_BITS(buf, 5, 2, 2);
	e->sad_count	= GRAB_BITS(buf, 5, 4, 4);

	e->aud_synch_delay = GRAB_BITS(buf, 6, 0, 8) * 2;
	e->spk_alloc	= GRAB_BITS(buf, 7, 0, 7);

	e->port_id	  = get_unaligned_le64(buf + 8);

	/* not specified, but the spec's tendency is little endian */
	e->manufacture_id = get_unaligned_le16(buf + 16);
	e->product_id	  = get_unaligned_le16(buf + 18);

	if (mnl > ELD_MAX_MNL) {
		snd_printd(KERN_INFO "HDMI: MNL is reserved value %d\n", mnl);
		goto out_fail;
	} else if (ELD_FIXED_BYTES + mnl > size) {
		snd_printd(KERN_INFO "HDMI: out of range MNL %d\n", mnl);
		goto out_fail;
	} else
		strlcpy(e->monitor_name, buf + ELD_FIXED_BYTES, mnl + 1);

	for (i = 0; i < e->sad_count; i++) {
		if (ELD_FIXED_BYTES + mnl + 3 * (i + 1) > size) {
			snd_printd(KERN_INFO "HDMI: out of range SAD %d\n", i);
			goto out_fail;
		}
		hdmi_update_short_audio_desc(e->sad + i,
					buf + ELD_FIXED_BYTES + mnl + 3 * i);
	}

	/*
	 * HDMI sink's ELD info cannot always be retrieved for now, e.g.
	 * in console or for audio devices. Assume the highest speakers
	 * configuration, to _not_ prohibit multi-channel audio playback.
	 */
	if (!e->spk_alloc)
		e->spk_alloc = 0xffff;

	return 0;

out_fail:
	return -EINVAL;
}