Skip to content

L
linux
Commit 77d2a8a4 authored by Takashi Sakamoto's avatar Takashi Sakamoto Committed by Takashi Iwai
Browse files
Options

ALSA: firewire-lib: Add support for channel mapping 

Some devices arrange the position of PCM/MIDI data channel in AMDTP packet.
This commit allows drivers to set channel mapping.

To be simple, the mapping table is an array with fixed length. Then the number
of channels for PCM is restricted by 64 channels.
Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 7b3b0d85
Show whitespace changes
Inline Side-by-side
Showing with 79 additions and 47 deletions
sound/firewire/amdtp.c
View file @ 77d2a8a4
......@@ -129,11 +129,12 @@ void amdtp_stream_set_parameters(struct amdtp_stream *s,
[CIP_SFC_176400] = 176400,
[CIP_SFC_192000] = 192000,
};
unsigned int sfc, midi_channels;
unsigned int i, sfc, midi_channels;
midi_channels = DIV_ROUND_UP(midi_ports, 8);
if (WARN_ON(amdtp_stream_running(s)) ||
if (WARN_ON(amdtp_stream_running(s)) |
WARN_ON(pcm_channels > AMDTP_MAX_CHANNELS_FOR_PCM) |
WARN_ON(midi_channels > AMDTP_MAX_CHANNELS_FOR_MIDI))
return;
......@@ -148,11 +149,12 @@ void amdtp_stream_set_parameters(struct amdtp_stream *s,
if (s->dual_wire) {
sfc -= 2;
rate /= 2;
pcm_channels *= 2;
s->pcm_channels = pcm_channels * 2;
} else {
s->pcm_channels = pcm_channels;
}
s->sfc = sfc;
s->data_block_quadlets = pcm_channels + midi_channels;
s->pcm_channels = pcm_channels;
s->data_block_quadlets = s->pcm_channels + midi_channels;
s->midi_ports = midi_ports;
s->syt_interval = amdtp_syt_intervals[sfc];
......@@ -162,6 +164,11 @@ void amdtp_stream_set_parameters(struct amdtp_stream *s,
if (s->flags & CIP_BLOCKING)
/* additional buffering needed to adjust for no-data packets */
s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate;
/* init the position map for PCM and MIDI channels */
for (i = 0; i < pcm_channels; i++)
s->pcm_positions[i] = i;
s->midi_position = s->pcm_channels;
}
EXPORT_SYMBOL(amdtp_stream_set_parameters);
......@@ -341,22 +348,21 @@ static void amdtp_write_s32(struct amdtp_stream *s,
__be32 *buffer, unsigned int frames)
{
struct snd_pcm_runtime *runtime = pcm->runtime;
unsigned int channels, remaining_frames, frame_step, i, c;
unsigned int channels, remaining_frames, i, c;
const u32 *src;
channels = s->pcm_channels;
src = (void *)runtime->dma_area +
frames_to_bytes(runtime, s->pcm_buffer_pointer);
remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
frame_step = s->data_block_quadlets - channels;
for (i = 0; i < frames; ++i) {
for (c = 0; c < channels; ++c) {
*buffer = cpu_to_be32((*src >> 8) | 0x40000000);
buffer[s->pcm_positions[c]] =
cpu_to_be32((*src >> 8) | 0x40000000);
src++;
buffer++;
}
buffer += frame_step;
buffer += s->data_block_quadlets;
if (--remaining_frames == 0)
src = (void *)runtime->dma_area;
}
......@@ -367,22 +373,21 @@ static void amdtp_write_s16(struct amdtp_stream *s,
__be32 *buffer, unsigned int frames)
{
struct snd_pcm_runtime *runtime = pcm->runtime;
unsigned int channels, remaining_frames, frame_step, i, c;
unsigned int channels, remaining_frames, i, c;
const u16 *src;
channels = s->pcm_channels;
src = (void *)runtime->dma_area +
frames_to_bytes(runtime, s->pcm_buffer_pointer);
remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
frame_step = s->data_block_quadlets - channels;
for (i = 0; i < frames; ++i) {
for (c = 0; c < channels; ++c) {
*buffer = cpu_to_be32((*src << 8) | 0x40000000);
buffer[s->pcm_positions[c]] =
cpu_to_be32((*src << 8) | 0x40000000);
src++;
buffer++;
}
buffer += frame_step;
buffer += s->data_block_quadlets;
if (--remaining_frames == 0)
src = (void *)runtime->dma_area;
}
......@@ -393,29 +398,29 @@ static void amdtp_write_s32_dualwire(struct amdtp_stream *s,
__be32 *buffer, unsigned int frames)
{
struct snd_pcm_runtime *runtime = pcm->runtime;
unsigned int channels, frame_adjust_1, frame_adjust_2, i, c;
unsigned int channels, remaining_frames, 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);
frames_to_bytes(runtime, s->pcm_buffer_pointer);
remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
channels = s->pcm_channels / 2;
channels /= 2;
for (i = 0; i < frames; ++i) {
for (c = 0; c < channels; ++c) {
*buffer = cpu_to_be32((*src >> 8) | 0x40000000);
buffer[s->pcm_positions[c] * 2] =
cpu_to_be32((*src >> 8) | 0x40000000);
src++;
buffer += 2;
}
buffer -= frame_adjust_1;
buffer += 1;
for (c = 0; c < channels; ++c) {
*buffer = cpu_to_be32((*src >> 8) | 0x40000000);
buffer[s->pcm_positions[c] * 2] =
cpu_to_be32((*src >> 8) | 0x40000000);
src++;
buffer += 2;
}
buffer -= frame_adjust_2;
buffer += s->data_block_quadlets - 1;
if (--remaining_frames == 0)
src = (void *)runtime->dma_area;
}
}
......@@ -424,29 +429,29 @@ static void amdtp_write_s16_dualwire(struct amdtp_stream *s,
__be32 *buffer, unsigned int frames)
{
struct snd_pcm_runtime *runtime = pcm->runtime;
unsigned int channels, frame_adjust_1, frame_adjust_2, i, c;
unsigned int channels, remaining_frames, 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);
frames_to_bytes(runtime, s->pcm_buffer_pointer);
remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
channels = s->pcm_channels / 2;
channels /= 2;
for (i = 0; i < frames; ++i) {
for (c = 0; c < channels; ++c) {
*buffer = cpu_to_be32((*src << 8) | 0x40000000);
buffer[s->pcm_positions[c] * 2] =
cpu_to_be32((*src << 8) | 0x40000000);
src++;
buffer += 2;
}
buffer -= frame_adjust_1;
buffer += 1;
for (c = 0; c < channels; ++c) {
*buffer = cpu_to_be32((*src << 8) | 0x40000000);
buffer[s->pcm_positions[c] * 2] =
cpu_to_be32((*src << 8) | 0x40000000);
src++;
buffer += 2;
}
buffer -= frame_adjust_2;
buffer += s->data_block_quadlets - 1;
if (--remaining_frames == 0)
src = (void *)runtime->dma_area;
}
}
......@@ -465,7 +470,7 @@ static void amdtp_read_s32(struct amdtp_stream *s,
for (i = 0; i < frames; ++i) {
for (c = 0; c < channels; ++c) {
*dst = be32_to_cpu(buffer[c]) << 8;
*dst = be32_to_cpu(buffer[s->pcm_positions[c]]) << 8;
dst++;
}
buffer += s->data_block_quadlets;
......@@ -489,12 +494,14 @@ static void amdtp_read_s32_dualwire(struct amdtp_stream *s,
for (i = 0; i < frames; ++i) {
for (c = 0; c < channels; ++c) {
*dst = be32_to_cpu(buffer[c * 2]) << 8;
*dst =
be32_to_cpu(buffer[s->pcm_positions[c] * 2]) << 8;
dst++;
}
buffer += 1;
for (c = 0; c < channels; ++c) {
*dst = be32_to_cpu(buffer[c * 2]) << 8;
*dst =
be32_to_cpu(buffer[s->pcm_positions[c] * 2]) << 8;
dst++;
}
buffer += s->data_block_quadlets - 1;
......@@ -510,11 +517,26 @@ static void amdtp_fill_pcm_silence(struct amdtp_stream *s,
for (i = 0; i < frames; ++i) {
for (c = 0; c < s->pcm_channels; ++c)
buffer[c] = cpu_to_be32(0x40000000);
buffer[s->pcm_positions[c]] = cpu_to_be32(0x40000000);
buffer += s->data_block_quadlets;
}
}
static void amdtp_fill_pcm_silence_dualwire(struct amdtp_stream *s,
__be32 *buffer, unsigned int frames)
{
unsigned int i, c, channels;
channels = s->pcm_channels / 2;
for (i = 0; i < frames; ++i) {
for (c = 0; c < channels; ++c) {
buffer[s->pcm_positions[c] * 2] =
buffer[s->pcm_positions[c] * 2 + 1] =
cpu_to_be32(0x40000000);
}
buffer += s->data_block_quadlets;
}
}
static void amdtp_fill_midi(struct amdtp_stream *s,
__be32 *buffer, unsigned int frames)
{
......@@ -522,8 +544,8 @@ static void amdtp_fill_midi(struct amdtp_stream *s,
u8 *b;
for (f = 0; f < frames; f++) {
buffer[s->pcm_channels + 1] = 0;
b = (u8 *)&buffer[s->pcm_channels + 1];
buffer[s->midi_position] = 0;
b = (u8 *)&buffer[s->midi_position];
port = (s->data_block_counter + f) % 8;
if ((s->midi[port] == NULL) ||
......@@ -545,7 +567,7 @@ static void amdtp_pull_midi(struct amdtp_stream *s,
for (f = 0; f < frames; f++) {
port = (s->data_block_counter + f) % 8;
b = (u8 *)&buffer[s->pcm_channels + 1];
b = (u8 *)&buffer[s->midi_position];
len = b[0] - 0x80;
if ((1 <= len) && (len <= 3) && (s->midi[port]))
......@@ -652,6 +674,8 @@ static void handle_out_packet(struct amdtp_stream *s, unsigned int syt)
pcm = ACCESS_ONCE(s->pcm);
if (pcm)
s->transfer_samples(s, pcm, buffer, data_blocks);
else if (s->dual_wire)
amdtp_fill_pcm_silence_dualwire(s, buffer, data_blocks);
else
amdtp_fill_pcm_silence(s, buffer, data_blocks);
if (s->midi_ports)
......@@ -683,7 +707,7 @@ static void handle_in_packet(struct amdtp_stream *s,
/*
* This module supports 'Two-quadlet CIP header with SYT field'.
* For convinience, also check FMT field is AM824 or not.
* For convenience, also check FMT field is AM824 or not.
*/
if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) ||
((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) ||
......
sound/firewire/amdtp.h
View file @ 77d2a8a4
......@@ -50,6 +50,12 @@ enum cip_sfc {
SNDRV_PCM_FMTBIT_S32)
/*
* This module supports maximum 64 PCM channels for one PCM stream
* This is for our convenience.
*/
#define AMDTP_MAX_CHANNELS_FOR_PCM 64
/*
* AMDTP packet can include channels for MIDI conformant data.
* Each MIDI conformant data channel includes 8 MPX-MIDI data stream.
......@@ -85,6 +91,8 @@ struct amdtp_stream {
void (*transfer_samples)(struct amdtp_stream *s,
struct snd_pcm_substream *pcm,
__be32 *buffer, unsigned int frames);
u8 pcm_positions[AMDTP_MAX_CHANNELS_FOR_PCM];
u8 midi_position;
unsigned int syt_interval;
unsigned int transfer_delay;
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7