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C++ snd_interval_refine函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中snd_interval_refine函数的典型用法代码示例。如果您正苦于以下问题：C++ snd_interval_refine函数的具体用法？C++ snd_interval_refine怎么用？C++ snd_interval_refine使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了snd_interval_refine函数的16个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: double_rate_hw_constraint_rate

static int double_rate_hw_constraint_rate(struct snd_pcm_hw_params *params,
					  struct snd_pcm_hw_rule *rule)
{
	struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	if (channels->min > 2) {
		static const struct snd_interval single_rates = {
			.min = 1,
			.max = 48000,
		};
		struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
		return snd_interval_refine(rate, &single_rates);
	}
	return 0;
}

static int double_rate_hw_constraint_channels(struct snd_pcm_hw_params *params,
					      struct snd_pcm_hw_rule *rule)
{
	struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	if (rate->min > 48000) {
		static const struct snd_interval double_rate_channels = {
			.min = 2,
			.max = 2,
		};
		struct snd_interval *channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
		return snd_interval_refine(channels, &double_rate_channels);
	}
	return 0;
}

/**
 * snd_ac97_pcm_double_rate_rules - set double rate constraints
 * @runtime: the runtime of the ac97 front playback pcm
 *
 * Installs the hardware constraint rules to prevent using double rates and
 * more than two channels at the same time.
 *
 * Return: Zero if successful, or a negative error code on failure.
 */
int snd_ac97_pcm_double_rate_rules(struct snd_pcm_runtime *runtime)
{
	int err;

	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				  double_rate_hw_constraint_rate, NULL,
				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
				  double_rate_hw_constraint_channels, NULL,
				  SNDRV_PCM_HW_PARAM_RATE, -1);
	return err;
}

EXPORT_SYMBOL(snd_ac97_pcm_double_rate_rules);
开发者ID:AD5GB，项目名称:kernel_n5_3.10-experimental，代码行数:55，代码来源:ac97_pcm.c


示例2: snd_pcm_period_size_rule

static int snd_pcm_period_size_rule(snd_pcm_hw_params_t *params,
				     snd_pcm_hw_rule_t   *rule)
{
	snd_interval_t *periodsize;
	snd_interval_t *channels;
	snd_interval_t  newperiodsize;

	int refine = 0;
	DEBUG_PRINT(("ALSA Core : >>> snd_pcm_period_size_rule \n"));
	periodsize    = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
	newperiodsize = *periodsize;
	channels      = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	DEBUG_PRINT(("ALSA Core : snd_pcm_period_size_rule Period size min=%d PS max =%d, channel min=%d 
		channel max =%d PCMP_MAX_SAMPLES =%d \n",periodsize->min,newperiodsize.max,channels->max, channels->min,PCMP_MAX_SAMPLES));

	if((periodsize->max * channels->min) > PCMP_MAX_SAMPLES) {
		newperiodsize.max = PCMP_MAX_SAMPLES / channels->min;
		refine = 1;
	}

	if((periodsize->min * channels->min) > PCMP_MAX_SAMPLES) {
		newperiodsize.min = PCMP_MAX_SAMPLES / channels->min;
		refine = 1;
	}

	if(refine) {
		DEBUG_PRINT(("snd_pcm_period_size_rule: refining (%d,%d) to (%d,%d)\n",periodsize->min,periodsize->max,newperiodsize.min,newperiodsize.max));
		return snd_interval_refine(periodsize, &newperiodsize);
	}
	DEBUG_PRINT(("ALSA Core : <<<  snd_pcm_period_size_rule \n"));
	return 0;
}
开发者ID:henrryhe，项目名称:beijing-7101，代码行数:32，代码来源:st_pcm_core.c


示例3: rule_mulkdiv

/* x = a * k / b */
static int rule_mulkdiv(snd_pcm_hw_params_t *params, int x, int a, int k, int b)
{
	snd_interval_t t;

	snd_interval_mulkdiv(hw_param_interval(params, a), k,
			     hw_param_interval(params, b), &t);
	return snd_interval_refine(hw_param_interval(params, x), &t);
}
开发者ID:Ace-III-Dev，项目名称:android_device_samsung_bcm_common_alsa-lib，代码行数:9，代码来源:pcm_ioplug.c


示例4: snd_interval_refine_set

static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
{
	struct snd_interval t;
	t.empty = 0;
	t.min = t.max = val;
	t.openmin = t.openmax = 0;
	t.integer = 1;
	return snd_interval_refine(i, &t);
}
开发者ID:Leoyzen，项目名称:Charm-Eye，代码行数:9，代码来源:u_uac1.c


示例5: snd_sb8_hw_constraint_channels_rate

static int snd_sb8_hw_constraint_channels_rate(snd_pcm_hw_params_t *params,
					       snd_pcm_hw_rule_t *rule)
{
	snd_interval_t *r = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	if (r->min > SB8_RATE(22050) || r->max <= SB8_RATE(11025)) {
		snd_interval_t t = { .min = 1, .max = 1 };
		return snd_interval_refine(hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS), &t);
	}
	return 0;
}
开发者ID:xricson，项目名称:knoppix，代码行数:10，代码来源:sb8_main.c


示例6: rule_channels

static int rule_channels(struct snd_pcm_hw_params *params,
			 struct snd_pcm_hw_rule *rule)
{
	struct snd_pcm_hardware *hw = rule->private;
	struct snd_interval t;

        t.min = hw->channels_min;
        t.max = hw->channels_max;
        t.openmin = t.openmax = 0;
        t.integer = 0;
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}
开发者ID:mjduddin，项目名称:B14CKB1RD_kernel_m8，代码行数:12，代码来源:aloop.c


示例7: _snd_pcm_hw_param_set

static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
				 snd_pcm_hw_param_t var, unsigned int val,
				 int dir)
{
	int changed;
	if (hw_is_mask(var)) {
		struct snd_mask *m = hw_param_mask(params, var);
		if (val == 0 && dir < 0) {
			changed = -EINVAL;
			snd_mask_none(m);
		} else {
			if (dir > 0)
				val++;
			else if (dir < 0)
				val--;
			changed = snd_mask_refine_set(
					hw_param_mask(params, var), val);
		}
	} else if (hw_is_interval(var)) {
		struct snd_interval *i = hw_param_interval(params, var);
		if (val == 0 && dir < 0) {
			changed = -EINVAL;
			snd_interval_none(i);
		} else if (dir == 0)
			changed = snd_interval_refine_set(i, val);
		else {
			struct snd_interval t;
			t.openmin = 1;
			t.openmax = 1;
			t.empty = 0;
			t.integer = 0;
			if (dir < 0) {
				t.min = val - 1;
				t.max = val;
			} else {
				t.min = val;
				t.max = val+1;
			}
			changed = snd_interval_refine(i, &t);
		}
	} else {
		return -EINVAL;
	}
	if (changed) {
		params->cmask |= 1 << var;
		params->rmask |= 1 << var;
	}
	return changed;
}
开发者ID:Leoyzen，项目名称:Charm-Eye，代码行数:49，代码来源:u_uac1.c


示例8: hw_rule_rate

static int
hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
{
	struct snd_bebob_stream_formation *formations = rule->private;
	struct snd_interval *r =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	const struct snd_interval *c =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_interval t = {
		.min = UINT_MAX, .max = 0, .integer = 1
	};
	unsigned int i;

	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
		/* entry is invalid */
		if (formations[i].pcm == 0)
			continue;

		if (!snd_interval_test(c, formations[i].pcm))
			continue;

		t.min = min(t.min, snd_bebob_rate_table[i]);
		t.max = max(t.max, snd_bebob_rate_table[i]);

	}
	return snd_interval_refine(r, &t);
}

static int
hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
{
	struct snd_bebob_stream_formation *formations = rule->private;
	struct snd_interval *c =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	const struct snd_interval *r =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval t = {
		.min = UINT_MAX, .max = 0, .integer = 1
	};

	unsigned int i;

	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
		/* entry is invalid */
		if (formations[i].pcm == 0)
			continue;

		if (!snd_interval_test(r, snd_bebob_rate_table[i]))
			continue;

		t.min = min(t.min, formations[i].pcm);
		t.max = max(t.max, formations[i].pcm);
	}

	return snd_interval_refine(c, &t);
}

static void
limit_channels_and_rates(struct snd_pcm_hardware *hw,
			 struct snd_bebob_stream_formation *formations)
{
	unsigned int i;

	hw->channels_min = UINT_MAX;
	hw->channels_max = 0;

	hw->rate_min = UINT_MAX;
	hw->rate_max = 0;
	hw->rates = 0;

	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
		/* entry has no PCM channels */
		if (formations[i].pcm == 0)
			continue;

		hw->channels_min = min(hw->channels_min, formations[i].pcm);
		hw->channels_max = max(hw->channels_max, formations[i].pcm);

		hw->rate_min = min(hw->rate_min, snd_bebob_rate_table[i]);
		hw->rate_max = max(hw->rate_max, snd_bebob_rate_table[i]);
		hw->rates |= snd_pcm_rate_to_rate_bit(snd_bebob_rate_table[i]);
	}
}

static int
pcm_init_hw_params(struct snd_bebob *bebob,
		   struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct amdtp_stream *s;
	struct snd_bebob_stream_formation *formations;
	int err;

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
		runtime->hw.formats = AM824_IN_PCM_FORMAT_BITS;
		s = &bebob->tx_stream;
		formations = bebob->tx_stream_formations;
	} else {
		runtime->hw.formats = AM824_OUT_PCM_FORMAT_BITS;
		s = &bebob->rx_stream;
//.........这里部分代码省略.........
开发者ID:AlexShiLucky，项目名称:linux，代码行数:101，代码来源:bebob_pcm.c


示例9: hw_rule_rate

static int
hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
{
	struct snd_bebob_stream_formation *formations = rule->private;
	struct snd_interval *r =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	const struct snd_interval *c =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_interval t = {
		.min = UINT_MAX, .max = 0, .integer = 1
	};
	unsigned int i;

	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
		/* entry is invalid */
		if (formations[i].pcm == 0)
			continue;

		if (!snd_interval_test(c, formations[i].pcm))
			continue;

		t.min = min(t.min, snd_bebob_rate_table[i]);
		t.max = max(t.max, snd_bebob_rate_table[i]);

	}
	return snd_interval_refine(r, &t);
}

static int
hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
{
	struct snd_bebob_stream_formation *formations = rule->private;
	struct snd_interval *c =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	const struct snd_interval *r =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval t = {
		.min = UINT_MAX, .max = 0, .integer = 1
	};

	unsigned int i;

	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
		/* entry is invalid */
		if (formations[i].pcm == 0)
			continue;

		if (!snd_interval_test(r, snd_bebob_rate_table[i]))
			continue;

		t.min = min(t.min, formations[i].pcm);
		t.max = max(t.max, formations[i].pcm);
	}

	return snd_interval_refine(c, &t);
}

static void
limit_channels_and_rates(struct snd_pcm_hardware *hw,
			 struct snd_bebob_stream_formation *formations)
{
	unsigned int i;

	hw->channels_min = UINT_MAX;
	hw->channels_max = 0;

	hw->rate_min = UINT_MAX;
	hw->rate_max = 0;
	hw->rates = 0;

	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
		/* entry has no PCM channels */
		if (formations[i].pcm == 0)
			continue;

		hw->channels_min = min(hw->channels_min, formations[i].pcm);
		hw->channels_max = max(hw->channels_max, formations[i].pcm);

		hw->rate_min = min(hw->rate_min, snd_bebob_rate_table[i]);
		hw->rate_max = max(hw->rate_max, snd_bebob_rate_table[i]);
		hw->rates |= snd_pcm_rate_to_rate_bit(snd_bebob_rate_table[i]);
	}
}

static void
limit_period_and_buffer(struct snd_pcm_hardware *hw)
{
	hw->periods_min = 2;		/* SNDRV_PCM_INFO_BATCH */
	hw->periods_max = UINT_MAX;

	hw->period_bytes_min = 4 * hw->channels_max;	/* bytes for a frame */

	/* Just to prevent from allocating much pages. */
	hw->period_bytes_max = hw->period_bytes_min * 2048;
	hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
}
开发者ID:DenisLug，项目名称:mptcp，代码行数:96，代码来源:bebob_pcm.c


示例10: hw_rule_rate

static int
hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
{
	unsigned int *pcm_channels = rule->private;
	struct snd_interval *r =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	const struct snd_interval *c =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_interval t = {
		.min = UINT_MAX, .max = 0, .integer = 1
	};
	unsigned int i, mode;

	for (i = 0; i < ARRAY_SIZE(freq_table); i++) {
		mode = get_multiplier_mode_with_index(i);
		if (!snd_interval_test(c, pcm_channels[mode]))
			continue;

		t.min = min(t.min, freq_table[i]);
		t.max = max(t.max, freq_table[i]);
	}

	return snd_interval_refine(r, &t);
}

static int
hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
{
	unsigned int *pcm_channels = rule->private;
	struct snd_interval *c =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	const struct snd_interval *r =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval t = {
		.min = UINT_MAX, .max = 0, .integer = 1
	};
	unsigned int i, mode;

	for (i = 0; i < ARRAY_SIZE(freq_table); i++) {
		mode = get_multiplier_mode_with_index(i);
		if (!snd_interval_test(r, freq_table[i]))
			continue;

		t.min = min(t.min, pcm_channels[mode]);
		t.max = max(t.max, pcm_channels[mode]);
	}

	return snd_interval_refine(c, &t);
}

static void
limit_channels(struct snd_pcm_hardware *hw, unsigned int *pcm_channels)
{
	unsigned int i, mode;

	hw->channels_min = UINT_MAX;
	hw->channels_max = 0;

	for (i = 0; i < ARRAY_SIZE(freq_table); i++) {
		mode = get_multiplier_mode_with_index(i);
		if (pcm_channels[mode] == 0)
			continue;

		hw->channels_min = min(hw->channels_min, pcm_channels[mode]);
		hw->channels_max = max(hw->channels_max, pcm_channels[mode]);
	}
}
开发者ID:19Dan01，项目名称:linux，代码行数:67，代码来源:fireworks_pcm.c


示例11: hw_rule_rate

static int hw_rule_rate(struct snd_pcm_hw_params *params,
			struct snd_pcm_hw_rule *rule)
{
	const unsigned int *pcm_channels = rule->private;
	struct snd_interval *r =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	const struct snd_interval *c =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_interval t = {
		.min = UINT_MAX, .max = 0, .integer = 1
	};
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
		enum snd_ff_stream_mode mode;
		int err;

		err = snd_ff_stream_get_multiplier_mode(i, &mode);
		if (err < 0)
			continue;

		if (!snd_interval_test(c, pcm_channels[mode]))
			continue;

		t.min = min(t.min, amdtp_rate_table[i]);
		t.max = max(t.max, amdtp_rate_table[i]);
	}

	return snd_interval_refine(r, &t);
}

static int hw_rule_channels(struct snd_pcm_hw_params *params,
			    struct snd_pcm_hw_rule *rule)
{
	const unsigned int *pcm_channels = rule->private;
	struct snd_interval *c =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	const struct snd_interval *r =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval t = {
		.min = UINT_MAX, .max = 0, .integer = 1
	};
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
		enum snd_ff_stream_mode mode;
		int err;

		err = snd_ff_stream_get_multiplier_mode(i, &mode);
		if (err < 0)
			continue;

		if (!snd_interval_test(r, amdtp_rate_table[i]))
			continue;

		t.min = min(t.min, pcm_channels[mode]);
		t.max = max(t.max, pcm_channels[mode]);
	}

	return snd_interval_refine(c, &t);
}

static void limit_channels_and_rates(struct snd_pcm_hardware *hw,
				     const unsigned int *pcm_channels)
{
	unsigned int rate, channels;
	int i;

	hw->channels_min = UINT_MAX;
	hw->channels_max = 0;
	hw->rate_min = UINT_MAX;
	hw->rate_max = 0;

	for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
		enum snd_ff_stream_mode mode;
		int err;

		err = snd_ff_stream_get_multiplier_mode(i, &mode);
		if (err < 0)
			continue;

		channels = pcm_channels[mode];
		if (pcm_channels[mode] == 0)
			continue;
		hw->channels_min = min(hw->channels_min, channels);
		hw->channels_max = max(hw->channels_max, channels);

		rate = amdtp_rate_table[i];
		hw->rates |= snd_pcm_rate_to_rate_bit(rate);
		hw->rate_min = min(hw->rate_min, rate);
		hw->rate_max = max(hw->rate_max, rate);
	}
}

static int pcm_init_hw_params(struct snd_ff *ff,
			      struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct amdtp_stream *s;
	const unsigned int *pcm_channels;
//.........这里部分代码省略.........
开发者ID:AlexShiLucky，项目名称:linux，代码行数:101，代码来源:ff-pcm.c


示例12: firewave_channels_constraint

static int firewave_channels_constraint(struct snd_pcm_hw_params *params,
					struct snd_pcm_hw_rule *rule)
{
	static const struct snd_interval all_channels = { .min = 6, .max = 6 };
	struct snd_interval *rate =
			hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval *channels =
			hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);

	/* 32/44.1 kHz work only with all six channels */
	if (snd_interval_max(rate) < 48000)
		return snd_interval_refine(channels, &all_channels);
	return 0;
}

static int firewave_constraints(struct snd_pcm_runtime *runtime)
{
	static unsigned int channels_list[] = { 2, 6 };
	static struct snd_pcm_hw_constraint_list channels_list_constraint = {
		.count = 2,
		.list = channels_list,
	};
	int err;

	runtime->hw.rates = SNDRV_PCM_RATE_32000 |
			    SNDRV_PCM_RATE_44100 |
			    SNDRV_PCM_RATE_48000 |
			    SNDRV_PCM_RATE_96000;
	runtime->hw.channels_max = 6;

	err = snd_pcm_hw_constraint_list(runtime, 0,
					 SNDRV_PCM_HW_PARAM_CHANNELS,
					 &channels_list_constraint);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				  firewave_rate_constraint, NULL,
				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
				  firewave_channels_constraint, NULL,
				  SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
		return err;

	return 0;
}

static int lacie_speakers_constraints(struct snd_pcm_runtime *runtime)
{
	runtime->hw.rates = SNDRV_PCM_RATE_32000 |
			    SNDRV_PCM_RATE_44100 |
			    SNDRV_PCM_RATE_48000 |
			    SNDRV_PCM_RATE_88200 |
			    SNDRV_PCM_RATE_96000;

	return 0;
}

static int fwspk_open(struct snd_pcm_substream *substream)
{
	static const struct snd_pcm_hardware hardware = {
		.info = SNDRV_PCM_INFO_MMAP |
			SNDRV_PCM_INFO_MMAP_VALID |
			SNDRV_PCM_INFO_BATCH |
			SNDRV_PCM_INFO_INTERLEAVED |
			SNDRV_PCM_INFO_BLOCK_TRANSFER,
		.formats = AMDTP_OUT_PCM_FORMAT_BITS,
		.channels_min = 2,
		.channels_max = 2,
		.buffer_bytes_max = 4 * 1024 * 1024,
		.period_bytes_min = 1,
		.period_bytes_max = UINT_MAX,
		.periods_min = 1,
		.periods_max = UINT_MAX,
	};
	struct fwspk *fwspk = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	runtime->hw = hardware;

	err = fwspk->device_info->pcm_constraints(runtime);
	if (err < 0)
		return err;
	err = snd_pcm_limit_hw_rates(runtime);
	if (err < 0)
		return err;

	err = snd_pcm_hw_constraint_minmax(runtime,
					   SNDRV_PCM_HW_PARAM_PERIOD_TIME,
					   5000, UINT_MAX);
	if (err < 0)
		return err;

	err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
	if (err < 0)
		return err;

//.........这里部分代码省略.........
开发者ID:openube，项目名称:android_kernel_sony_c2305，代码行数:101，代码来源:speakers.c


示例13: dice_rate_constraint

static int dice_rate_constraint(struct snd_pcm_hw_params *params,
				struct snd_pcm_hw_rule *rule)
{
	struct snd_pcm_substream *substream = rule->private;
	struct snd_dice *dice = substream->private_data;

	const struct snd_interval *c =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_interval *r =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval rates = {
		.min = UINT_MAX, .max = 0, .integer = 1
	};
	unsigned int i, rate, mode, *pcm_channels;

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
		pcm_channels = dice->tx_channels;
	else
		pcm_channels = dice->rx_channels;

	for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) {
		rate = snd_dice_rates[i];
		if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0)
			continue;

		if (!snd_interval_test(c, pcm_channels[mode]))
			continue;

		rates.min = min(rates.min, rate);
		rates.max = max(rates.max, rate);
	}

	return snd_interval_refine(r, &rates);
}

static int dice_channels_constraint(struct snd_pcm_hw_params *params,
				    struct snd_pcm_hw_rule *rule)
{
	struct snd_pcm_substream *substream = rule->private;
	struct snd_dice *dice = substream->private_data;

	const struct snd_interval *r =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval *c =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_interval channels = {
		.min = UINT_MAX, .max = 0, .integer = 1
	};
	unsigned int i, rate, mode, *pcm_channels;

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
		pcm_channels = dice->tx_channels;
	else
		pcm_channels = dice->rx_channels;

	for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) {
		rate = snd_dice_rates[i];
		if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0)
			continue;

		if (!snd_interval_test(r, rate))
			continue;

		channels.min = min(channels.min, pcm_channels[mode]);
		channels.max = max(channels.max, pcm_channels[mode]);
	}

	return snd_interval_refine(c, &channels);
}

static void limit_channels_and_rates(struct snd_dice *dice,
				     struct snd_pcm_runtime *runtime,
				     unsigned int *pcm_channels)
{
	struct snd_pcm_hardware *hw = &runtime->hw;
	unsigned int i, rate, mode;

	hw->channels_min = UINT_MAX;
	hw->channels_max = 0;

	for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) {
		rate = snd_dice_rates[i];
		if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0)
			continue;
		hw->rates |= snd_pcm_rate_to_rate_bit(rate);

		if (pcm_channels[mode] == 0)
			continue;
		hw->channels_min = min(hw->channels_min, pcm_channels[mode]);
		hw->channels_max = max(hw->channels_max, pcm_channels[mode]);
	}

	snd_pcm_limit_hw_rates(runtime);
}

static void limit_period_and_buffer(struct snd_pcm_hardware *hw)
{
	hw->periods_min = 2;			/* SNDRV_PCM_INFO_BATCH */
	hw->periods_max = UINT_MAX;

//.........这里部分代码省略.........
开发者ID:19Dan01，项目名称:linux，代码行数:101，代码来源:dice-pcm.c


示例14: hw_rule_rate

static int hw_rule_rate(struct snd_pcm_hw_params *params,
			struct snd_pcm_hw_rule *rule)
{
	struct snd_interval *r =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	const struct snd_interval *c =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_interval t = {
		.min = UINT_MAX, .max = 0, .integer = 1,
	};
	unsigned int i;

	for (i = 0; i < SND_DG00X_RATE_COUNT; i++) {
		if (!snd_interval_test(c,
				       snd_dg00x_stream_pcm_channels[i]))
			continue;

		t.min = min(t.min, snd_dg00x_stream_rates[i]);
		t.max = max(t.max, snd_dg00x_stream_rates[i]);
	}

	return snd_interval_refine(r, &t);
}

static int hw_rule_channels(struct snd_pcm_hw_params *params,
			    struct snd_pcm_hw_rule *rule)
{
	struct snd_interval *c =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	const struct snd_interval *r =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval t = {
		.min = UINT_MAX, .max = 0, .integer = 1,
	};
	unsigned int i;

	for (i = 0; i < SND_DG00X_RATE_COUNT; i++) {
		if (!snd_interval_test(r, snd_dg00x_stream_rates[i]))
			continue;

		t.min = min(t.min, snd_dg00x_stream_pcm_channels[i]);
		t.max = max(t.max, snd_dg00x_stream_pcm_channels[i]);
	}

	return snd_interval_refine(c, &t);
}

static int pcm_init_hw_params(struct snd_dg00x *dg00x,
			      struct snd_pcm_substream *substream)
{
	static const struct snd_pcm_hardware hardware = {
		.info = SNDRV_PCM_INFO_BATCH |
			SNDRV_PCM_INFO_BLOCK_TRANSFER |
			SNDRV_PCM_INFO_INTERLEAVED |
			SNDRV_PCM_INFO_JOINT_DUPLEX |
			SNDRV_PCM_INFO_MMAP |
			SNDRV_PCM_INFO_MMAP_VALID,
		.rates = SNDRV_PCM_RATE_44100 |
			 SNDRV_PCM_RATE_48000 |
			 SNDRV_PCM_RATE_88200 |
			 SNDRV_PCM_RATE_96000,
		.rate_min = 44100,
		.rate_max = 96000,
		.channels_min = 10,
		.channels_max = 18,
		.period_bytes_min = 4 * 18,
		.period_bytes_max = 4 * 18 * 2048,
		.buffer_bytes_max = 4 * 18 * 2048 * 2,
		.periods_min = 2,
		.periods_max = UINT_MAX,
	};
	struct amdtp_stream *s;
	int err;

	substream->runtime->hw = hardware;

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
		substream->runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
		s = &dg00x->tx_stream;
	} else {
		substream->runtime->hw.formats = SNDRV_PCM_FMTBIT_S16 |
						 SNDRV_PCM_FMTBIT_S32;
		s = &dg00x->rx_stream;
	}

	err = snd_pcm_hw_rule_add(substream->runtime, 0,
				  SNDRV_PCM_HW_PARAM_CHANNELS,
				  hw_rule_channels, NULL,
				  SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
		return err;

	err = snd_pcm_hw_rule_add(substream->runtime, 0,
				  SNDRV_PCM_HW_PARAM_RATE,
				  hw_rule_rate, NULL,
				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (err < 0)
		return err;

	return amdtp_dot_add_pcm_hw_constraints(s, substream->runtime);
//.........这里部分代码省略.........
开发者ID:AshishNamdev，项目名称:linux，代码行数:101，代码来源:digi00x-pcm.c


示例15: hw_rule_rate

static int
hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule,
	     struct snd_bebob *bebob,
	     struct snd_bebob_stream_formation *formations)
{
	struct snd_interval *r =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	const struct snd_interval *c =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_interval t = {
		.min = UINT_MAX, .max = 0, .integer = 1
	};
	unsigned int i;

	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
		/* entry is invalid */
		if (formations[i].pcm == 0)
			continue;

		if (!snd_interval_test(c, formations[i].pcm))
			continue;

		t.min = min(t.min, snd_bebob_rate_table[i]);
		t.max = max(t.max, snd_bebob_rate_table[i]);

	}
	return snd_interval_refine(r, &t);
}

static int
hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule,
		 struct snd_bebob *bebob,
		 struct snd_bebob_stream_formation *formations)
{
	struct snd_interval *c =
		hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	const struct snd_interval *r =
		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval t = {
		.min = UINT_MAX, .max = 0, .integer = 1
	};

	unsigned int i;

	for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
		/* entry is invalid */
		if (formations[i].pcm == 0)
			continue;

		if (!snd_interval_test(r, snd_bebob_rate_table[i]))
			continue;

		t.min = min(t.min, formations[i].pcm);
		t.max = max(t.max, formations[i].pcm);
	}

	return snd_interval_refine(c, &t);
}

static inline int
hw_rule_capture_rate(struct snd_pcm_hw_params *params,
				struct snd_pcm_hw_rule *rule)
{
	struct snd_bebob *bebob = rule->private;
	return hw_rule_rate(params, rule, bebob,
				bebob->tx_stream_formations);
}

static inline int
hw_rule_playback_rate(struct snd_pcm_hw_params *params,
				struct snd_pcm_hw_rule *rule)
{
	struct snd_bebob *bebob = rule->private;
	return hw_rule_rate(params, rule, bebob,
				bebob->rx_stream_formations);
}

static inline int
hw_rule_capture_channels(struct snd_pcm_hw_params *params,
				struct snd_pcm_hw_rule *rule)
{
	struct snd_bebob *bebob = rule->private;
	return hw_rule_channels(params, rule, bebob,
				bebob->tx_stream_formations);
}

static inline int
hw_rule_playback_channels(struct snd_pcm_hw_params *params,
				struct snd_pcm_hw_rule *rule)
{
	struct snd_bebob *bebob = rule->private;
	return hw_rule_channels(params, rule, bebob,
				bebob->rx_stream_formations);
}

static void
prepare_channels(struct snd_pcm_hardware *hw,
	  struct snd_bebob_stream_formation *formations)
{
	unsigned int i;
//.........这里部分代码省略.........
开发者ID:rucoder，项目名称:snd-firewire-improve，代码行数:101，代码来源:bebob_pcm.c


示例16: atmel_ssc_hw_rule_rate

/*
 * When the bit clock is input, limit the maximum rate according to the
 * Serial Clock Ratio Considerations section from the SSC documentation:
 *
 *   The Transmitter and the Receiver can be programmed to operate
 *   with the clock signals provided on either the TK or RK pins.
 *   This allows the SSC to support many slave-mode data transfers.
 *   In this case, the maximum clock speed allowed on the RK pin is:
 *   - Peripheral clock divided by 2 if Receiver Frame Synchro is input
 *   - Peripheral clock divided by 3 if Receiver Frame Synchro is output
 *   In addition, the maximum clock speed allowed on the TK pin is:
 *   - Peripheral clock divided by 6 if Transmit Frame Synchro is input
 *   - Peripheral clock divided by 2 if Transmit Frame Synchro is output
 *
 * When the bit clock is output, limit the rate according to the
 * SSC divider restrictions.
 */
static int atmel_ssc_hw_rule_rate(struct snd_pcm_hw_params *params,
				  struct snd_pcm_hw_rule *rule)
{
	struct atmel_ssc_info *ssc_p = rule->private;
	struct ssc_device *ssc = ssc_p->ssc;
	struct snd_interval *i = hw_param_interval(params, rule->var);
	struct snd_interval t;
	struct snd_ratnum r = {
		.den_min = 1,
		.den_max = 4095,
		.den_step = 1,
	};
	unsigned int num = 0, den = 0;
	int frame_size;
	int mck_div = 2;
	int ret;

	frame_size = snd_soc_params_to_frame_size(params);
	if (frame_size < 0)
		return frame_size;

	switch (ssc_p->daifmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFS:
		if ((ssc_p->dir_mask & SSC_DIR_MASK_CAPTURE)
		    && ssc->clk_from_rk_pin)
			/* Receiver Frame Synchro (i.e. capture)
			 * is output (format is _CFS) and the RK pin
			 * is used for input (format is _CBM_).
			 */
			mck_div = 3;
		break;

	case SND_SOC_DAIFMT_CBM_CFM:
		if ((ssc_p->dir_mask & SSC_DIR_MASK_PLAYBACK)
		    && !ssc->clk_from_rk_pin)
			/* Transmit Frame Synchro (i.e. playback)
			 * is input (format is _CFM) and the TK pin
			 * is used for input (format _CBM_ but not
			 * using the RK pin).
			 */
			mck_div = 6;
		break;
	}

	switch (ssc_p->daifmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
		r.num = ssc_p->mck_rate / mck_div / frame_size;

		ret = snd_interval_ratnum(i, 1, &r, &num, &den);
		if (ret >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
			params->rate_num = num;
			params->rate_den = den;
		}
		break;

	case SND_SOC_DAIFMT_CBM_CFS:
	case SND_SOC_DAIFMT_CBM_CFM:
		t.min = 8000;
		t.max = ssc_p->mck_rate / mck_div / frame_size;
		t.openmin = t.openmax = 0;
		t.integer = 0;
		ret = snd_interval_refine(i, &t);
		break;

	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

/*-------------------------------------------------------------------------*\
 * DAI functions
\*-------------------------------------------------------------------------*/
/*
 * Startup.  Only that one substream allowed in each direction.
 */
static int atmel_ssc_startup(struct snd_pcm_substream *substream,
			     struct snd_soc_dai *dai)
{
	struct platform_device *pdev = to_platform_device(dai->dev);
	struct atmel_ssc_info *ssc_p = &ssc_info[pdev->id];
//.........这里部分代码省略.........
开发者ID:acton393，项目名称:linux，代码行数:101，代码来源:atmel_ssc_dai.c



注：本文中的snd_interval_refine函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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