[alsa-devel] [PATCH 27/29] ALSA: oxfw: add support for capturing PCM samples
Takashi Sakamoto
o-takashi at sakamocchi.jp
Sun Oct 26 14:03:28 CET 2014
In previous commit, a support for transmitted packets is added. This commit
add a support for capturing PCM samples.
When any streams are already started, this driver should not change sampling
rate of the device, thus this commit also adds a restriction of sampling rate
in this situation.
Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
sound/firewire/oxfw/oxfw-pcm.c | 181 ++++++++++++++++++++++++++++++++++++-----
1 file changed, 161 insertions(+), 20 deletions(-)
diff --git a/sound/firewire/oxfw/oxfw-pcm.c b/sound/firewire/oxfw/oxfw-pcm.c
index b2fd930..25921f0 100644
--- a/sound/firewire/oxfw/oxfw-pcm.c
+++ b/sound/firewire/oxfw/oxfw-pcm.c
@@ -118,21 +118,31 @@ static void limit_period_and_buffer(struct snd_pcm_hardware *hw)
hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
}
-static int pcm_open(struct snd_pcm_substream *substream)
+static int init_hw_params(struct snd_oxfw *oxfw,
+ struct snd_pcm_substream *substream)
{
- struct snd_oxfw *oxfw = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
u8 **formats;
+ struct amdtp_stream *stream;
int err;
- formats = oxfw->rx_stream_formats;
-
runtime->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;
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+ runtime->hw.formats = AMDTP_IN_PCM_FORMAT_BITS;
+ stream = &oxfw->tx_stream;
+ formats = oxfw->tx_stream_formats;
+ } else {
+ runtime->hw.formats = AMDTP_OUT_PCM_FORMAT_BITS;
+ stream = &oxfw->rx_stream;
+ formats = oxfw->rx_stream_formats;
+ }
+
limit_channels_and_rates(&runtime->hw, formats);
limit_period_and_buffer(&runtime->hw);
@@ -148,10 +158,55 @@ static int pcm_open(struct snd_pcm_substream *substream)
if (err < 0)
goto end;
- err = amdtp_stream_add_pcm_hw_constraints(&oxfw->rx_stream, runtime);
+ err = amdtp_stream_add_pcm_hw_constraints(stream, runtime);
+end:
+ return err;
+}
+
+static int limit_to_current_params(struct snd_pcm_substream *substream)
+{
+ struct snd_oxfw *oxfw = substream->private_data;
+ struct snd_oxfw_stream_formation formation;
+ enum avc_general_plug_dir dir;
+ int err;
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ dir = AVC_GENERAL_PLUG_DIR_OUT;
+ else
+ dir = AVC_GENERAL_PLUG_DIR_IN;
+
+ err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
+ if (err < 0)
+ goto end;
+
+ substream->runtime->hw.channels_min = formation.pcm;
+ substream->runtime->hw.channels_max = formation.pcm;
+ substream->runtime->hw.rate_min = formation.rate;
+ substream->runtime->hw.rate_max = formation.rate;
+end:
+ return err;
+}
+
+static int pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_oxfw *oxfw = substream->private_data;
+ int err;
+
+ err = init_hw_params(oxfw, substream);
if (err < 0)
goto end;
+ /*
+ * When any PCM streams are already running, the available sampling
+ * rate is limited at current value.
+ */
+ if (amdtp_stream_pcm_running(&oxfw->tx_stream) ||
+ amdtp_stream_pcm_running(&oxfw->rx_stream)) {
+ err = limit_to_current_params(substream);
+ if (err < 0)
+ goto end;
+ }
+
snd_pcm_set_sync(substream);
end:
return err;
@@ -162,26 +217,70 @@ static int pcm_close(struct snd_pcm_substream *substream)
return 0;
}
-static int pcm_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *hw_params)
+static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
{
struct snd_oxfw *oxfw = substream->private_data;
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ atomic_inc(&oxfw->capture_substreams);
+ amdtp_stream_set_pcm_format(&oxfw->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_oxfw *oxfw = substream->private_data;
+
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ atomic_inc(&oxfw->playback_substreams);
amdtp_stream_set_pcm_format(&oxfw->rx_stream, params_format(hw_params));
+
return snd_pcm_lib_alloc_vmalloc_buffer(substream,
params_buffer_bytes(hw_params));
}
-static int pcm_hw_free(struct snd_pcm_substream *substream)
+static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_oxfw *oxfw = substream->private_data;
+
+ if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+ atomic_dec(&oxfw->capture_substreams);
+
+ snd_oxfw_stream_stop_simplex(oxfw, &oxfw->tx_stream);
+
+ return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
+ if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+ atomic_dec(&oxfw->playback_substreams);
+
snd_oxfw_stream_stop_simplex(oxfw, &oxfw->rx_stream);
return snd_pcm_lib_free_vmalloc_buffer(substream);
}
-static int pcm_prepare(struct snd_pcm_substream *substream)
+static int pcm_capture_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_oxfw *oxfw = substream->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int err;
+
+ err = snd_oxfw_stream_start_simplex(oxfw, &oxfw->tx_stream,
+ runtime->rate, runtime->channels);
+ if (err < 0)
+ goto end;
+
+ amdtp_stream_pcm_prepare(&oxfw->tx_stream);
+end:
+ return err;
+}
+static int pcm_playback_prepare(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
@@ -197,7 +296,23 @@ end:
return err;
}
-static int pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_oxfw *oxfw = substream->private_data;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ amdtp_stream_pcm_trigger(&oxfw->tx_stream, substream);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ amdtp_stream_pcm_trigger(&oxfw->tx_stream, NULL);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_oxfw *oxfw = substream->private_data;
@@ -214,35 +329,61 @@ static int pcm_trigger(struct snd_pcm_substream *substream, int cmd)
return 0;
}
-static snd_pcm_uframes_t pcm_pointer(struct snd_pcm_substream *substream)
+static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstm)
{
- struct snd_oxfw *oxfw = substream->private_data;
+ struct snd_oxfw *oxfw = sbstm->private_data;
+
+ return amdtp_stream_pcm_pointer(&oxfw->tx_stream);
+}
+static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstm)
+{
+ struct snd_oxfw *oxfw = sbstm->private_data;
return amdtp_stream_pcm_pointer(&oxfw->rx_stream);
}
int snd_oxfw_create_pcm(struct snd_oxfw *oxfw)
{
- static struct snd_pcm_ops ops = {
+ static struct snd_pcm_ops 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,
+ .mmap = snd_pcm_lib_mmap_vmalloc,
+ };
+ static struct snd_pcm_ops playback_ops = {
.open = pcm_open,
.close = pcm_close,
.ioctl = snd_pcm_lib_ioctl,
- .hw_params = pcm_hw_params,
- .hw_free = pcm_hw_free,
- .prepare = pcm_prepare,
- .trigger = pcm_trigger,
- .pointer = pcm_pointer,
+ .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,
};
struct snd_pcm *pcm;
+ unsigned int cap = 0;
int err;
- err = snd_pcm_new(oxfw->card, oxfw->card->driver, 0, 1, 0, &pcm);
+ if (oxfw->has_output)
+ cap = 1;
+
+ err = snd_pcm_new(oxfw->card, oxfw->card->driver, 0, 1, cap, &pcm);
if (err < 0)
return err;
+
pcm->private_data = oxfw;
strcpy(pcm->name, oxfw->card->shortname);
- snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &ops);
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
+ if (cap > 0)
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
+
return 0;
}
--
1.9.1
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