}
EXPORT_SYMBOL(amdtp_out_stream_destroy);
+unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = {
+ [CIP_SFC_32000] = 8,
+ [CIP_SFC_44100] = 8,
+ [CIP_SFC_48000] = 8,
+ [CIP_SFC_88200] = 16,
+ [CIP_SFC_96000] = 16,
+ [CIP_SFC_176400] = 32,
+ [CIP_SFC_192000] = 32,
+};
+EXPORT_SYMBOL(amdtp_syt_intervals);
+
/**
- * amdtp_out_stream_set_rate - set the sample rate
+ * amdtp_out_stream_set_parameters - set stream parameters
* @s: the AMDTP output stream to configure
* @rate: the sample rate
+ * @pcm_channels: the number of PCM samples in each data block, to be encoded
+ * as AM824 multi-bit linear audio
+ * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels)
*
- * The sample rate must be set before the stream is started, and must not be
+ * The parameters must be set before the stream is started, and must not be
* changed while the stream is running.
*/
-void amdtp_out_stream_set_rate(struct amdtp_out_stream *s, unsigned int rate)
+void amdtp_out_stream_set_parameters(struct amdtp_out_stream *s,
+ unsigned int rate,
+ unsigned int pcm_channels,
+ unsigned int midi_ports)
{
- static const struct {
- unsigned int rate;
- unsigned int syt_interval;
- } rate_info[] = {
- [CIP_SFC_32000] = { 32000, 8, },
- [CIP_SFC_44100] = { 44100, 8, },
- [CIP_SFC_48000] = { 48000, 8, },
- [CIP_SFC_88200] = { 88200, 16, },
- [CIP_SFC_96000] = { 96000, 16, },
- [CIP_SFC_176400] = { 176400, 32, },
- [CIP_SFC_192000] = { 192000, 32, },
+ static const unsigned int rates[] = {
+ [CIP_SFC_32000] = 32000,
+ [CIP_SFC_44100] = 44100,
+ [CIP_SFC_48000] = 48000,
+ [CIP_SFC_88200] = 88200,
+ [CIP_SFC_96000] = 96000,
+ [CIP_SFC_176400] = 176400,
+ [CIP_SFC_192000] = 192000,
};
unsigned int sfc;
if (WARN_ON(amdtp_out_stream_running(s)))
return;
- for (sfc = 0; sfc < ARRAY_SIZE(rate_info); ++sfc)
- if (rate_info[sfc].rate == rate)
+ for (sfc = 0; sfc < CIP_SFC_COUNT; ++sfc)
+ if (rates[sfc] == rate)
goto sfc_found;
WARN_ON(1);
return;
sfc_found:
+ s->dual_wire = (s->flags & CIP_HI_DUALWIRE) && sfc > CIP_SFC_96000;
+ if (s->dual_wire) {
+ sfc -= 2;
+ rate /= 2;
+ pcm_channels *= 2;
+ }
s->sfc = sfc;
- s->syt_interval = rate_info[sfc].syt_interval;
+ s->data_block_quadlets = pcm_channels + DIV_ROUND_UP(midi_ports, 8);
+ s->pcm_channels = pcm_channels;
+ s->midi_ports = midi_ports;
+
+ s->syt_interval = amdtp_syt_intervals[sfc];
/* default buffering in the device */
s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE;
/* additional buffering needed to adjust for no-data packets */
s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate;
}
-EXPORT_SYMBOL(amdtp_out_stream_set_rate);
+EXPORT_SYMBOL(amdtp_out_stream_set_parameters);
/**
* amdtp_out_stream_get_max_payload - get the stream's packet size
* @s: the AMDTP output stream
*
* This function must not be called before the stream has been configured
- * with amdtp_out_stream_set_rate(), amdtp_out_stream_set_pcm(), and
- * amdtp_out_stream_set_midi().
+ * with amdtp_out_stream_set_parameters().
*/
unsigned int amdtp_out_stream_get_max_payload(struct amdtp_out_stream *s)
{
- s->data_block_quadlets = s->pcm_channels;
- s->data_block_quadlets += DIV_ROUND_UP(s->midi_ports, 8);
-
return 8 + s->syt_interval * s->data_block_quadlets * 4;
}
EXPORT_SYMBOL(amdtp_out_stream_get_max_payload);
static void amdtp_write_s32(struct amdtp_out_stream *s,
struct snd_pcm_substream *pcm,
__be32 *buffer, unsigned int frames);
+static void amdtp_write_s16_dualwire(struct amdtp_out_stream *s,
+ struct snd_pcm_substream *pcm,
+ __be32 *buffer, unsigned int frames);
+static void amdtp_write_s32_dualwire(struct amdtp_out_stream *s,
+ struct snd_pcm_substream *pcm,
+ __be32 *buffer, unsigned int frames);
/**
* amdtp_out_stream_set_pcm_format - set the PCM format
* @s: the AMDTP output stream to configure
* @format: the format of the ALSA PCM device
*
- * The sample format must be set before the stream is started, and must not be
- * changed while the stream is running.
+ * The sample format must be set after the other paramters (rate/PCM channels/
+ * MIDI) and before the stream is started, and must not be changed while the
+ * stream is running.
*/
void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s,
snd_pcm_format_t format)
WARN_ON(1);
/* fall through */
case SNDRV_PCM_FORMAT_S16:
- s->transfer_samples = amdtp_write_s16;
+ if (s->dual_wire)
+ s->transfer_samples = amdtp_write_s16_dualwire;
+ else
+ s->transfer_samples = amdtp_write_s16;
break;
case SNDRV_PCM_FORMAT_S32:
- s->transfer_samples = amdtp_write_s32;
+ if (s->dual_wire)
+ s->transfer_samples = amdtp_write_s32_dualwire;
+ else
+ s->transfer_samples = amdtp_write_s32;
break;
}
}
}
}
+static void amdtp_write_s32_dualwire(struct amdtp_out_stream *s,
+ struct snd_pcm_substream *pcm,
+ __be32 *buffer, unsigned int frames)
+{
+ struct snd_pcm_runtime *runtime = pcm->runtime;
+ unsigned int channels, frame_adjust_1, frame_adjust_2, i, c;
+ const u32 *src;
+
+ channels = s->pcm_channels;
+ src = (void *)runtime->dma_area +
+ s->pcm_buffer_pointer * (runtime->frame_bits / 8);
+ frame_adjust_1 = channels - 1;
+ frame_adjust_2 = 1 - (s->data_block_quadlets - channels);
+
+ channels /= 2;
+ for (i = 0; i < frames; ++i) {
+ for (c = 0; c < channels; ++c) {
+ *buffer = cpu_to_be32((*src >> 8) | 0x40000000);
+ src++;
+ buffer += 2;
+ }
+ buffer -= frame_adjust_1;
+ for (c = 0; c < channels; ++c) {
+ *buffer = cpu_to_be32((*src >> 8) | 0x40000000);
+ src++;
+ buffer += 2;
+ }
+ buffer -= frame_adjust_2;
+ }
+}
+
+static void amdtp_write_s16_dualwire(struct amdtp_out_stream *s,
+ struct snd_pcm_substream *pcm,
+ __be32 *buffer, unsigned int frames)
+{
+ struct snd_pcm_runtime *runtime = pcm->runtime;
+ unsigned int channels, frame_adjust_1, frame_adjust_2, i, c;
+ const u16 *src;
+
+ channels = s->pcm_channels;
+ src = (void *)runtime->dma_area +
+ s->pcm_buffer_pointer * (runtime->frame_bits / 8);
+ frame_adjust_1 = channels - 1;
+ frame_adjust_2 = 1 - (s->data_block_quadlets - channels);
+
+ channels /= 2;
+ for (i = 0; i < frames; ++i) {
+ for (c = 0; c < channels; ++c) {
+ *buffer = cpu_to_be32((*src << 8) | 0x40000000);
+ src++;
+ buffer += 2;
+ }
+ buffer -= frame_adjust_1;
+ for (c = 0; c < channels; ++c) {
+ *buffer = cpu_to_be32((*src << 8) | 0x40000000);
+ src++;
+ buffer += 2;
+ }
+ buffer -= frame_adjust_2;
+ }
+}
+
static void amdtp_fill_pcm_silence(struct amdtp_out_stream *s,
__be32 *buffer, unsigned int frames)
{
s->packet_index = index;
if (pcm) {
+ if (s->dual_wire)
+ data_blocks *= 2;
+
ptr = s->pcm_buffer_pointer + data_blocks;
if (ptr >= pcm->runtime->buffer_size)
ptr -= pcm->runtime->buffer_size;
* @speed: firewire speed code
*
* The stream cannot be started until it has been configured with
- * amdtp_out_stream_set_rate(), amdtp_out_stream_set_pcm(),
- * amdtp_out_stream_set_midi(), and amdtp_out_stream_set_format();
+ * amdtp_out_stream_set_parameters() and amdtp_out_stream_set_pcm_format(),
* and it must be started before any PCM or MIDI device can be started.
*/
int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed)
projects / ~andy / linux / blobdiff