[alsa-devel] [PATCH 31/39] bebob: Add PCM interface
Takashi Sakamoto
o-takashi at sakamocchi.jp
Wed Mar 5 11:48:19 CET 2014
This commit adds a functionality to capture/playback PCM samples.
When AMDTP stream is already running for PCM or the source of clock is not
internal, available sampling rate is limited at current one.
---
sound/firewire/Kconfig | 1 +
sound/firewire/bebob/Makefile | 1 +
sound/firewire/bebob/bebob.c | 4 +
sound/firewire/bebob/bebob.h | 4 +
sound/firewire/bebob/bebob_pcm.c | 442 +++++++++++++++++++++++++++++++++++++++
5 files changed, 452 insertions(+)
create mode 100644 sound/firewire/bebob/bebob_pcm.c
diff --git a/sound/firewire/Kconfig b/sound/firewire/Kconfig
index 8081ca1..022fee0 100644
--- a/sound/firewire/Kconfig
+++ b/sound/firewire/Kconfig
@@ -83,6 +83,7 @@ config SND_BEBOB
tristate "BridgeCo DM1000/1500 with BeBoB firmware"
select SND_FIREWIRE_LIB
select SND_RAWMIDI
+ select SND_PCM
help
Say Y here to include support for FireWire devices based
on BridgeCo DM1000/1500 with BeBoB firmware:
diff --git a/sound/firewire/bebob/Makefile b/sound/firewire/bebob/Makefile
index 1e39e59..533718a 100644
--- a/sound/firewire/bebob/Makefile
+++ b/sound/firewire/bebob/Makefile
@@ -1,3 +1,4 @@
snd-bebob-objs := bebob_command.o bebob_stream.o bebob_proc.o bebob_midi.o \
+ bebob_pcm.o \
bebob.o
obj-m += snd-bebob.o
diff --git a/sound/firewire/bebob/bebob.c b/sound/firewire/bebob/bebob.c
index 3872854..dea3ef3 100644
--- a/sound/firewire/bebob/bebob.c
+++ b/sound/firewire/bebob/bebob.c
@@ -174,6 +174,10 @@ bebob_probe(struct fw_unit *unit,
goto error;
}
+ err = snd_bebob_create_pcm_devices(bebob);
+ if (err < 0)
+ goto error;
+
err = snd_card_register(card);
if (err < 0) {
snd_card_free(card);
diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h
index 1e1db6c..b310c85 100644
--- a/sound/firewire/bebob/bebob.h
+++ b/sound/firewire/bebob/bebob.h
@@ -22,6 +22,8 @@
#include <sound/initval.h>
#include <sound/info.h>
#include <sound/rawmidi.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
#include "../lib.h"
#include "../fcp.h"
@@ -181,6 +183,8 @@ void snd_bebob_proc_init(struct snd_bebob *bebob);
int snd_bebob_create_midi_devices(struct snd_bebob *bebob);
+int snd_bebob_create_pcm_devices(struct snd_bebob *bebob);
+
#define SND_BEBOB_DEV_ENTRY(vendor, model) \
{ \
.match_flags = IEEE1394_MATCH_VENDOR_ID | \
diff --git a/sound/firewire/bebob/bebob_pcm.c b/sound/firewire/bebob/bebob_pcm.c
new file mode 100644
index 0000000..db9c87f
--- /dev/null
+++ b/sound/firewire/bebob/bebob_pcm.c
@@ -0,0 +1,442 @@
+/*
+ * bebob_pcm.c - a part of driver for BeBoB based devices
+ *
+ * Copyright (c) 2013 Takashi Sakamoto
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include "./bebob.h"
+
+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;
+
+ 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);
+ }
+}
+
+static void
+prepare_rates(struct snd_pcm_hardware *hw,
+ struct snd_bebob_stream_formation *formations)
+{
+ unsigned int i;
+
+ for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
+ /* entry has no PCM channels */
+ if (formations[i].pcm == 0)
+ continue;
+
+ 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)
+{
+ int err;
+
+ static const struct snd_pcm_hardware hw = {
+ .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,
+ /* set up later */
+ .rates = 0,
+ .rate_min = UINT_MAX,
+ .rate_max = 0,
+ /* set up later */
+ .channels_min = UINT_MAX,
+ .channels_max = 0,
+ .buffer_bytes_max = 4 * 16 * 2048 * 2,
+ .period_bytes_min = 1,
+ .period_bytes_max = 4 * 16 * 2048,
+ .periods_min = 2,
+ .periods_max = UINT_MAX,
+ };
+
+ substream->runtime->hw = hw;
+
+ /* add rule between channels and sampling rate */
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+ prepare_rates(&substream->runtime->hw,
+ bebob->tx_stream_formations);
+ prepare_channels(&substream->runtime->hw,
+ bebob->tx_stream_formations);
+ substream->runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
+ snd_pcm_hw_rule_add(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_CHANNELS,
+ hw_rule_capture_channels, bebob,
+ SNDRV_PCM_HW_PARAM_RATE, -1);
+ snd_pcm_hw_rule_add(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_RATE,
+ hw_rule_capture_rate, bebob,
+ SNDRV_PCM_HW_PARAM_CHANNELS, -1);
+ } else {
+ prepare_rates(&substream->runtime->hw,
+ bebob->rx_stream_formations);
+ prepare_channels(&substream->runtime->hw,
+ bebob->rx_stream_formations);
+ substream->runtime->hw.formats = AMDTP_OUT_PCM_FORMAT_BITS;
+ snd_pcm_hw_rule_add(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_CHANNELS,
+ hw_rule_playback_channels, bebob,
+ SNDRV_PCM_HW_PARAM_RATE, -1);
+ snd_pcm_hw_rule_add(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_RATE,
+ hw_rule_playback_rate, bebob,
+ SNDRV_PCM_HW_PARAM_CHANNELS, -1);
+ }
+
+ /* AM824 in IEC 61883-6 can deliver 24bit data */
+ err = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
+ if (err < 0)
+ goto end;
+
+ /*
+ * AMDTP functionality in firewire-lib require periods to be aligned to
+ * 16 bit, or 24bit inner 32bit.
+ */
+ err = snd_pcm_hw_constraint_step(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
+ if (err < 0)
+ goto end;
+ err = snd_pcm_hw_constraint_step(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
+ if (err < 0)
+ goto end;
+
+ /*
+ * Currently INTERRUPT_INTERVAL in amdtp.c is 16.
+ * So snd_pcm_period_elapsed() can be called every 2m sec.
+ */
+ err = snd_pcm_hw_constraint_minmax(substream->runtime,
+ SNDRV_PCM_HW_PARAM_PERIOD_TIME,
+ 2000, UINT_MAX);
+end:
+ return err;
+}
+
+static int
+pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_bebob *bebob = substream->private_data;
+ unsigned int sampling_rate;
+ bool internal;
+ int err;
+
+ err = pcm_init_hw_params(bebob, substream);
+ if (err < 0)
+ goto end;
+
+ err = snd_bebob_stream_check_internal_clock(bebob, &internal);
+ if (err < 0)
+ goto end;
+
+ /*
+ * When source of clock is internal or any PCM stream are running,
+ * the available sampling rate is limited at current sampling rate.
+ */
+ if (!internal ||
+ amdtp_stream_pcm_running(&bebob->tx_stream) ||
+ amdtp_stream_pcm_running(&bebob->rx_stream)) {
+ err = snd_bebob_stream_get_rate(bebob, &sampling_rate);
+ if (err < 0)
+ goto end;
+
+ substream->runtime->hw.rate_min = sampling_rate;
+ substream->runtime->hw.rate_max = sampling_rate;
+ }
+
+ snd_pcm_set_sync(substream);
+
+end:
+ return err;
+}
+
+static int
+pcm_close(struct snd_pcm_substream *substream)
+{
+ return 0;
+}
+
+static int
+pcm_capture_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct snd_bebob *bebob = substream->private_data;
+
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ bebob->capture_substreams++;
+ amdtp_stream_set_pcm_format(&bebob->tx_stream,
+ params_format(hw_params));
+ return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(hw_params));
+}
+static int
+pcm_playback_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct snd_bebob *bebob = substream->private_data;
+
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ bebob->playback_substreams++;
+ amdtp_stream_set_pcm_format(&bebob->rx_stream,
+ params_format(hw_params));
+ return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(hw_params));
+}
+
+static int
+pcm_capture_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_bebob *bebob = substream->private_data;
+
+ if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+ bebob->capture_substreams--;
+
+ snd_bebob_stream_stop_duplex(bebob);
+
+ return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+static int
+pcm_playback_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_bebob *bebob = substream->private_data;
+
+ if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+ bebob->playback_substreams--;
+
+ snd_bebob_stream_stop_duplex(bebob);
+
+ return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+
+static int
+pcm_capture_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_bebob *bebob = substream->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int err;
+
+ err = snd_bebob_stream_start_duplex(bebob, &bebob->tx_stream,
+ runtime->rate);
+ if (err >= 0)
+ amdtp_stream_pcm_prepare(&bebob->tx_stream);
+
+ return err;
+}
+static int
+pcm_playback_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_bebob *bebob = substream->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int err;
+
+ err = snd_bebob_stream_start_duplex(bebob, &bebob->rx_stream,
+ runtime->rate);
+ if (err >= 0)
+ amdtp_stream_pcm_prepare(&bebob->rx_stream);
+
+ return err;
+}
+
+static int
+pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_bebob *bebob = substream->private_data;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ amdtp_stream_pcm_trigger(&bebob->tx_stream, substream);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+static int
+pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_bebob *bebob = substream->private_data;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ amdtp_stream_pcm_trigger(&bebob->rx_stream, substream);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static snd_pcm_uframes_t
+pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
+{
+ struct snd_bebob *bebob = sbstrm->private_data;
+ return amdtp_stream_pcm_pointer(&bebob->tx_stream);
+}
+static snd_pcm_uframes_t
+pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
+{
+ struct snd_bebob *bebob = sbstrm->private_data;
+ return amdtp_stream_pcm_pointer(&bebob->rx_stream);
+}
+
+static const struct snd_pcm_ops pcm_capture_ops = {
+ .open = pcm_open,
+ .close = pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = pcm_capture_hw_params,
+ .hw_free = pcm_capture_hw_free,
+ .prepare = pcm_capture_prepare,
+ .trigger = pcm_capture_trigger,
+ .pointer = pcm_capture_pointer,
+ .page = snd_pcm_lib_get_vmalloc_page,
+};
+static const struct snd_pcm_ops pcm_playback_ops = {
+ .open = pcm_open,
+ .close = pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = pcm_playback_hw_params,
+ .hw_free = pcm_playback_hw_free,
+ .prepare = pcm_playback_prepare,
+ .trigger = pcm_playback_trigger,
+ .pointer = pcm_playback_pointer,
+ .page = snd_pcm_lib_get_vmalloc_page,
+ .mmap = snd_pcm_lib_mmap_vmalloc,
+};
+
+int snd_bebob_create_pcm_devices(struct snd_bebob *bebob)
+{
+ struct snd_pcm *pcm;
+ int err;
+
+ err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm);
+ if (err < 0)
+ goto end;
+
+ pcm->private_data = bebob;
+ snprintf(pcm->name, sizeof(pcm->name),
+ "%s PCM", bebob->card->shortname);
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
+end:
+ return err;
+}
--
1.8.3.2
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