From 4edeb831f32d17fba056eb752f7afc26a19674a0 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Sun, 4 Dec 2011 22:07:01 +0100 Subject: [PATCH 23/29] ALSA: dice: dynamic sample rate selection Instead of relying of some control panel application to configure some fixed sample rate, allow applications to set it automatically. Signed-off-by: Clemens Ladisch --- sound/firewire/dice.c | 137 +++++++++++++++++++++++++++++++++++++------------- 1 file changed, 102 insertions(+), 35 deletions(-) diff --git a/sound/firewire/dice.c b/sound/firewire/dice.c index e6bba6d32bd8..61dd00c4fae3 100644 --- a/sound/firewire/dice.c +++ b/sound/firewire/dice.c @@ -70,6 +70,17 @@ static const unsigned int dice_rates[] = { [6] = 192000, }; +static unsigned int rate_to_index(unsigned int rate) +{ + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(dice_rates); ++i) + if (dice_rates[i] == rate) + return i; + + return 0; +} + static unsigned int rate_index_to_mode(unsigned int rate_index) { return ((int)rate_index - 1) / 2; @@ -302,6 +313,59 @@ static void dice_notification(struct fw_card *card, struct fw_request *request, wake_up(&dice->hwdep_wait); } +static int dice_rate_constraint(struct snd_pcm_hw_params *params, + struct snd_pcm_hw_rule *rule) +{ + struct dice *dice = rule->private; + const struct snd_interval *channels = + hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); + struct snd_interval *rate = + hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); + struct snd_interval allowed_rates = { + .min = UINT_MAX, .max = 0, .integer = 1 + }; + unsigned int i, mode; + + for (i = 0; i < ARRAY_SIZE(dice_rates); ++i) { + mode = rate_index_to_mode(i); + if ((dice->clock_caps & (1 << i)) && + snd_interval_test(channels, dice->rx_channels[mode])) { + allowed_rates.min = min(allowed_rates.min, + dice_rates[i]); + allowed_rates.max = max(allowed_rates.max, + dice_rates[i]); + } + } + + return snd_interval_refine(rate, &allowed_rates); +} + +static int dice_channels_constraint(struct snd_pcm_hw_params *params, + struct snd_pcm_hw_rule *rule) +{ + struct dice *dice = rule->private; + const struct snd_interval *rate = + hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); + struct snd_interval *channels = + hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); + struct snd_interval allowed_channels = { + .min = UINT_MAX, .max = 0, .integer = 1 + }; + unsigned int i, mode; + + for (i = 0; i < ARRAY_SIZE(dice_rates); ++i) + if ((dice->clock_caps & (1 << i)) && + snd_interval_test(rate, dice_rates[i])) { + mode = rate_index_to_mode(i); + allowed_channels.min = min(allowed_channels.min, + dice->rx_channels[mode]); + allowed_channels.max = max(allowed_channels.max, + dice->rx_channels[mode]); + } + + return snd_interval_refine(channels, &allowed_channels); +} + static int dice_open(struct snd_pcm_substream *substream) { static const struct snd_pcm_hardware hardware = { @@ -311,6 +375,8 @@ static int dice_open(struct snd_pcm_substream *substream) SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER, .formats = AMDTP_OUT_PCM_FORMAT_BITS, + .channels_min = UINT_MAX, + .channels_max = 0, .buffer_bytes_max = 16 * 1024 * 1024, .period_bytes_min = 1, .period_bytes_max = UINT_MAX, @@ -319,53 +385,46 @@ static int dice_open(struct snd_pcm_substream *substream) }; struct dice *dice = substream->private_data; struct snd_pcm_runtime *runtime = substream->runtime; - __be32 clock_sel, data[2]; - unsigned int rate_index, number_audio, number_midi; + unsigned int i; int err; err = dice_try_lock(dice); if (err < 0) goto error; - err = snd_fw_transaction(dice->unit, TCODE_READ_QUADLET_REQUEST, - global_address(dice, GLOBAL_CLOCK_SELECT), - &clock_sel, 4, 0); - if (err < 0) - goto err_lock; - rate_index = (be32_to_cpu(clock_sel) & CLOCK_RATE_MASK) - >> CLOCK_RATE_SHIFT; - if (rate_index >= ARRAY_SIZE(dice_rates)) { - err = -ENXIO; - goto err_lock; - } - - err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST, - rx_address(dice, RX_NUMBER_AUDIO), - data, 2 * 4, 0); - if (err < 0) - goto err_lock; - number_audio = be32_to_cpu(data[0]); - number_midi = be32_to_cpu(data[1]); - runtime->hw = hardware; - runtime->hw.rates = snd_pcm_rate_to_rate_bit(dice_rates[rate_index]); + for (i = 0; i < ARRAY_SIZE(dice_rates); ++i) + if (dice->clock_caps & (1 << i)) + runtime->hw.rates |= + snd_pcm_rate_to_rate_bit(dice_rates[i]); snd_pcm_limit_hw_rates(runtime); - runtime->hw.channels_min = number_audio; - runtime->hw.channels_max = number_audio; + for (i = 0; i < 3; ++i) + if (dice->rx_channels[i]) { + runtime->hw.channels_min = min(runtime->hw.channels_min, + dice->rx_channels[i]); + runtime->hw.channels_max = max(runtime->hw.channels_max, + dice->rx_channels[i]); + } - amdtp_out_stream_set_parameters(&dice->stream, dice_rates[rate_index], - number_audio, number_midi); + err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, + dice_rate_constraint, dice, + SNDRV_PCM_HW_PARAM_CHANNELS, -1); + if (err < 0) + goto err_lock; + err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, + dice_channels_constraint, dice, + SNDRV_PCM_HW_PARAM_RATE, -1); + if (err < 0) + goto err_lock; err = snd_pcm_hw_constraint_step(runtime, 0, - SNDRV_PCM_HW_PARAM_PERIOD_SIZE, - amdtp_syt_intervals[rate_index]); + SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 32); if (err < 0) goto err_lock; err = snd_pcm_hw_constraint_step(runtime, 0, - SNDRV_PCM_HW_PARAM_BUFFER_SIZE, - amdtp_syt_intervals[rate_index]); + SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 32); if (err < 0) goto err_lock; @@ -502,6 +561,7 @@ static int dice_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { struct dice *dice = substream->private_data; + unsigned int rate_index, mode; int err; mutex_lock(&dice->mutex); @@ -511,15 +571,22 @@ static int dice_hw_params(struct snd_pcm_substream *substream, err = snd_pcm_lib_alloc_vmalloc_buffer(substream, params_buffer_bytes(hw_params)); if (err < 0) - goto error; + return err; + rate_index = rate_to_index(params_rate(hw_params)); + err = dice_change_rate(dice, rate_index << CLOCK_RATE_SHIFT); + if (err < 0) + return err; + + mode = rate_index_to_mode(rate_index); + amdtp_out_stream_set_parameters(&dice->stream, + params_rate(hw_params), + params_channels(hw_params), + dice->rx_midi_ports[mode]); amdtp_out_stream_set_pcm_format(&dice->stream, params_format(hw_params)); return 0; - -error: - return err; } static int dice_hw_free(struct snd_pcm_substream *substream) -- 1.8.3.2