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![Takashi Sakamoto](/assets/img/avatar_default.png)
This commit takes ALSA fireface driver to perform sequence replay for media clock recovery. The protocol specific to RME Fireface series is not compliant to IEC 61883-1/6 since it has no CIP header, therefore presentation time is not used for media clock recovery. The sequence of the number of data blocks per packet is important. I note that the device skips an isochronous cycle corresponding to an empty packet or a NODATA packet in blocking transmission method of IEC 61883-1/6. For sequence replay, the cycle is handled as receiving an empty packet. Furthermore, it doesn't start packet transmission till receiving any packet. The sequence replay is tested with below models: * Fireface 400 * Fireface 800 * Fireface 802 I note that it is better to initialize Fireface 400 in advance by initialization transaction implemented in snd-fireface-ctl-service of snd-firewire-ctl-services project. You can see whether initialized or not by HOST LED on the device. Unless, the device often stops packet transmission even if session starts. I guess the sequence replay also works well with below models: * Fireface UFX * Fireface UCX Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20210531025103.17880-7-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
173 lines
4.3 KiB
C
173 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* amdtp-ff.c - a part of driver for RME Fireface series
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*
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* Copyright (c) 2015-2017 Takashi Sakamoto
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*/
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#include <sound/pcm.h>
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#include "ff.h"
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struct amdtp_ff {
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unsigned int pcm_channels;
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};
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int amdtp_ff_set_parameters(struct amdtp_stream *s, unsigned int rate,
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unsigned int pcm_channels)
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{
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struct amdtp_ff *p = s->protocol;
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unsigned int data_channels;
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if (amdtp_stream_running(s))
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return -EBUSY;
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p->pcm_channels = pcm_channels;
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data_channels = pcm_channels;
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return amdtp_stream_set_parameters(s, rate, data_channels);
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}
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static void write_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
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__le32 *buffer, unsigned int frames,
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unsigned int pcm_frames)
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{
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struct amdtp_ff *p = s->protocol;
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unsigned int channels = p->pcm_channels;
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int pcm_buffer_pointer;
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int remaining_frames;
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const u32 *src;
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int i, c;
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pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
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pcm_buffer_pointer %= runtime->buffer_size;
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src = (void *)runtime->dma_area +
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frames_to_bytes(runtime, pcm_buffer_pointer);
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remaining_frames = runtime->buffer_size - pcm_buffer_pointer;
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for (i = 0; i < frames; ++i) {
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for (c = 0; c < channels; ++c) {
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buffer[c] = cpu_to_le32(*src);
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src++;
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}
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buffer += s->data_block_quadlets;
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if (--remaining_frames == 0)
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src = (void *)runtime->dma_area;
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}
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}
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static void read_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
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__le32 *buffer, unsigned int frames,
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unsigned int pcm_frames)
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{
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struct amdtp_ff *p = s->protocol;
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unsigned int channels = p->pcm_channels;
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int pcm_buffer_pointer;
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int remaining_frames;
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u32 *dst;
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int i, c;
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pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
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pcm_buffer_pointer %= runtime->buffer_size;
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dst = (void *)runtime->dma_area +
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frames_to_bytes(runtime, pcm_buffer_pointer);
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remaining_frames = runtime->buffer_size - pcm_buffer_pointer;
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for (i = 0; i < frames; ++i) {
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for (c = 0; c < channels; ++c) {
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*dst = le32_to_cpu(buffer[c]) & 0xffffff00;
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dst++;
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}
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buffer += s->data_block_quadlets;
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if (--remaining_frames == 0)
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dst = (void *)runtime->dma_area;
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}
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}
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static void write_pcm_silence(struct amdtp_stream *s,
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__le32 *buffer, unsigned int frames)
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{
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struct amdtp_ff *p = s->protocol;
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unsigned int i, c, channels = p->pcm_channels;
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for (i = 0; i < frames; ++i) {
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for (c = 0; c < channels; ++c)
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buffer[c] = cpu_to_le32(0x00000000);
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buffer += s->data_block_quadlets;
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}
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}
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int amdtp_ff_add_pcm_hw_constraints(struct amdtp_stream *s,
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struct snd_pcm_runtime *runtime)
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{
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int err;
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err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
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if (err < 0)
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return err;
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return amdtp_stream_add_pcm_hw_constraints(s, runtime);
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}
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static unsigned int process_it_ctx_payloads(struct amdtp_stream *s,
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const struct pkt_desc *descs,
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unsigned int packets,
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struct snd_pcm_substream *pcm)
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{
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unsigned int pcm_frames = 0;
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int i;
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for (i = 0; i < packets; ++i) {
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const struct pkt_desc *desc = descs + i;
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__le32 *buf = (__le32 *)desc->ctx_payload;
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unsigned int data_blocks = desc->data_blocks;
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if (pcm) {
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write_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
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pcm_frames += data_blocks;
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} else {
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write_pcm_silence(s, buf, data_blocks);
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}
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}
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return pcm_frames;
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}
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static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s,
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const struct pkt_desc *descs,
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unsigned int packets,
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struct snd_pcm_substream *pcm)
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{
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unsigned int pcm_frames = 0;
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int i;
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for (i = 0; i < packets; ++i) {
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const struct pkt_desc *desc = descs + i;
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__le32 *buf = (__le32 *)desc->ctx_payload;
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unsigned int data_blocks = desc->data_blocks;
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if (pcm) {
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read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
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pcm_frames += data_blocks;
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}
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}
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return pcm_frames;
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}
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int amdtp_ff_init(struct amdtp_stream *s, struct fw_unit *unit,
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enum amdtp_stream_direction dir)
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{
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amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
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if (dir == AMDTP_IN_STREAM)
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process_ctx_payloads = process_ir_ctx_payloads;
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else
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process_ctx_payloads = process_it_ctx_payloads;
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return amdtp_stream_init(s, unit, dir, CIP_BLOCKING | CIP_UNAWARE_SYT | CIP_NO_HEADER, 0,
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process_ctx_payloads, sizeof(struct amdtp_ff));
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}
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