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124 lines
4.2 KiB
Diff
124 lines
4.2 KiB
Diff
From 025d3ad4d5adeff00e97b6fafdf32d6d199d0baa Mon Sep 17 00:00:00 2001
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From: Jonathan Woithe <jwoithe@just42.net>
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Date: Tue, 13 Mar 2012 15:43:03 +1030
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Subject: [PATCH] Support setbufsize in firewire driver
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---
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drivers/firewire/ffado_driver.c | 69 ++++++++++++++++++++++++++++++++++-----
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1 file changed, 60 insertions(+), 9 deletions(-)
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diff --git a/drivers/firewire/ffado_driver.c b/drivers/firewire/ffado_driver.c
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index a8ad1ea..6035af3 100644
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--- a/drivers/firewire/ffado_driver.c
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+++ b/drivers/firewire/ffado_driver.c
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@@ -7,6 +7,7 @@
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* http://www.jackaudio.org
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*
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* Copyright (C) 2005-2007 Pieter Palmers
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+ * Copyright (C) 2012 Jonathan Woithe
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@@ -50,7 +51,10 @@
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static int ffado_driver_stop (ffado_driver_t *driver);
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+// Basic functionality requires API version 8. If version 9 or later
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+// is present the buffers can be resized at runtime.
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#define FIREWIRE_REQUIRED_FFADO_API_VERSION 8
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+#define FIREWIRE_REQUIRED_FFADO_API_VERSION_FOR_SETBUFSIZE 9
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// enable verbose messages
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static int g_verbose=0;
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@@ -675,24 +679,71 @@
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static int
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ffado_driver_bufsize (ffado_driver_t* driver, jack_nframes_t nframes)
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{
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- printError("Buffer size change requested but not supported!!!");
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+ signed int chn;
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+
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+ // The speed of this function isn't critical; we can afford the
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+ // time to check the FFADO API version.
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+ if (ffado_get_api_version() < FIREWIRE_REQUIRED_FFADO_API_VERSION_FOR_SETBUFSIZE ||
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+ ffado_streaming_set_period_size == NULL) {
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+ printError("unsupported on current version of FFADO; please upgrade FFADO");
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+ return -1;
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+ }
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- /*
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- driver->period_size = nframes;
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+ driver->period_size = nframes;
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driver->period_usecs =
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(jack_time_t) floor ((((float) nframes) / driver->sample_rate)
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* 1000000.0f);
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- */
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-
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+
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+ // Reallocate the null and scratch buffers.
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+ driver->nullbuffer = calloc(driver->period_size, sizeof(ffado_sample_t));
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+ if(driver->nullbuffer == NULL) {
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+ printError("could not allocate memory for null buffer");
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+ return -1;
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+ }
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+ driver->scratchbuffer = calloc(driver->period_size, sizeof(ffado_sample_t));
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+ if(driver->scratchbuffer == NULL) {
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+ printError("could not allocate memory for scratch buffer");
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+ return -1;
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+ }
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+
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+ // MIDI buffers need reallocating
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+ for (chn = 0; chn < driver->capture_nchannels; chn++) {
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+ if(driver->capture_channels[chn].stream_type == ffado_stream_type_midi) {
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+ // setup the midi buffer
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+ if (driver->capture_channels[chn].midi_buffer != NULL)
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+ free(driver->capture_channels[chn].midi_buffer);
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+ driver->capture_channels[chn].midi_buffer = calloc(driver->period_size, sizeof(uint32_t));
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+ }
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+ }
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+ for (chn = 0; chn < driver->playback_nchannels; chn++) {
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+ if(driver->playback_channels[chn].stream_type == ffado_stream_type_midi) {
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+ if (driver->playback_channels[chn].midi_buffer != NULL)
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+ free(driver->playback_channels[chn].midi_buffer);
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+ driver->playback_channels[chn].midi_buffer = calloc(driver->period_size, sizeof(uint32_t));
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+ }
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+ }
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+
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+ // Notify FFADO of the period size change
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+ if (ffado_streaming_set_period_size(driver->dev, nframes) != 0) {
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+ printError("could not alter FFADO device period size");
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+ return -1;
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+ }
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+
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+ // This is needed to give the shadow variables a chance to
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+ // properly update to the changes.
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+ sleep(1);
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+
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/* tell the engine to change its buffer size */
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-#if 0
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if (driver->engine->set_buffer_size (driver->engine, nframes)) {
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jack_error ("FFADO: cannot set engine buffer size to %d (check MIDI)", nframes);
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return -1;
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}
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-#endif
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- return -1; // unsupported
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+ // Other drivers (eg: ALSA) don't seem to adjust latencies via
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+ // jack_port_set_latency_range() from the bufsize() callback, so we
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+ // won't either. Is this right?
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+
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+ return 0;
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}
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typedef void (*JackDriverFinishFunction) (jack_driver_t *);
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@@ -704,7 +755,7 @@
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{
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ffado_driver_t *driver;
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- if(ffado_get_api_version() != FIREWIRE_REQUIRED_FFADO_API_VERSION) {
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+ if(ffado_get_api_version() < FIREWIRE_REQUIRED_FFADO_API_VERSION) {
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printError("Incompatible libffado version! (%s)", ffado_get_version());
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return NULL;
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}
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--
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1.7.10
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