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authorThomas Martitz <kugel@rockbox.org>2011-12-24 11:56:46 +0000
committerThomas Martitz <kugel@rockbox.org>2011-12-24 11:56:46 +0000
commit249bba03f1051f4984538f66b9e7d36674c61e5c (patch)
treeb9a0d78e05269ed2043521ab0dfdad83aeaf2aff /firmware/target/hosted/pcm-alsa.c
parent567e0ad93ef3048f2266932b10dcdb309b1a77c9 (diff)
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Initial commit of the Samsung YP-R0 port.
This port is a hybrid native/RaaA port. It runs on a embedded linux system, but is the only application. It therefore can implement lots of stuff that native targets also implement, while leveraging the underlying linux kernel. The port is quite advanced. User interface, audio playback, plugins work mostly fine. Missing is e.g. power mangement and USB (see SamsungYPR0 wiki page). Included in utils/ypr0tools are scripts and programs required to generate a patched firmware. The patched firmware has the rootfs modified to load Rockbox. It includes a early/safe USB mode. This port needs a new toolchain, one that includes glibc headers and libraries. rockboxdev.sh can generate it, but e.g. codesourcey and distro packages may also work. Most of the initial effort is done by Lorenzo Miori and others (on ABI), including reverse engineering and patching of the original firmware, initial drivers, and more. Big thanks to you. Flyspray: FS#12348 Author: Lorenzo Miori, myself Merry christmas to ypr0 owners! :) git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31415 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/hosted/pcm-alsa.c')
-rw-r--r--firmware/target/hosted/pcm-alsa.c518
1 files changed, 518 insertions, 0 deletions
diff --git a/firmware/target/hosted/pcm-alsa.c b/firmware/target/hosted/pcm-alsa.c
new file mode 100644
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+++ b/firmware/target/hosted/pcm-alsa.c
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+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * Copyright (C) 2010 Thomas Martitz
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+
+/*
+ * Based, but heavily modified, on the example given at
+ * http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2pcm_8c-example.html
+ *
+ * This driver uses the so-called unsafe async callback method and hardcoded device
+ * names. It fails when the audio device is busy by other apps.
+ *
+ * TODO: Rewrite this to do it properly with multithreading
+ *
+ * Alternatively, a version using polling in a tick task is provided. While
+ * supposedly safer, it appears to use more CPU (however I didn't measure it
+ * accurately, only looked at htop). At least, in this mode the "default"
+ * device works which doesnt break with other apps running.
+ * device works which doesnt break with other apps running.
+ */
+
+
+#include "autoconf.h"
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include <alsa/asoundlib.h>
+#include "system.h"
+#include "debug.h"
+#include "kernel.h"
+
+#include "pcm.h"
+#include "pcm-internal.h"
+#include "pcm_mixer.h"
+#include "pcm_sampr.h"
+
+#include <pthread.h>
+#include <signal.h>
+
+#define USE_ASYNC_CALLBACK
+/* plughw:0,0 works with both, however "default" is recommended.
+ * default doesnt seem to work with async callback but doesn't break
+ * with multple applications running */
+static char device[] = "plughw:0,0"; /* playback device */
+static const snd_pcm_access_t access_ = SND_PCM_ACCESS_RW_INTERLEAVED; /* access mode */
+static const snd_pcm_format_t format = SND_PCM_FORMAT_S16; /* sample format */
+static const int channels = 2; /* count of channels */
+static unsigned int rate = 44100; /* stream rate */
+
+static snd_pcm_t *handle;
+static snd_pcm_sframes_t buffer_size = MIX_FRAME_SAMPLES * 32; /* ~16k */
+static snd_pcm_sframes_t period_size = MIX_FRAME_SAMPLES * 4; /* ~4k */
+static short *frames;
+
+static const char *pcm_data = 0;
+static size_t pcm_size = 0;
+
+#ifdef USE_ASYNC_CALLBACK
+static snd_async_handler_t *ahandler;
+static pthread_mutex_t pcm_mtx;
+#else
+static int recursion;
+#endif
+
+static int set_hwparams(snd_pcm_t *handle, unsigned sample_rate)
+{
+ unsigned int rrate;
+ int err;
+ snd_pcm_hw_params_t *params;
+ snd_pcm_hw_params_alloca(&params);
+
+
+ /* choose all parameters */
+ err = snd_pcm_hw_params_any(handle, params);
+ if (err < 0)
+ {
+ printf("Broken configuration for playback: no configurations available: %s\n", snd_strerror(err));
+ return err;
+ }
+ /* set the interleaved read/write format */
+ err = snd_pcm_hw_params_set_access(handle, params, access_);
+ if (err < 0)
+ {
+ printf("Access type not available for playback: %s\n", snd_strerror(err));
+ return err;
+ }
+ /* set the sample format */
+ err = snd_pcm_hw_params_set_format(handle, params, format);
+ if (err < 0)
+ {
+ printf("Sample format not available for playback: %s\n", snd_strerror(err));
+ return err;
+ }
+ /* set the count of channels */
+ err = snd_pcm_hw_params_set_channels(handle, params, channels);
+ if (err < 0)
+ {
+ printf("Channels count (%i) not available for playbacks: %s\n", channels, snd_strerror(err));
+ return err;
+ }
+ /* set the stream rate */
+ rrate = sample_rate;
+ err = snd_pcm_hw_params_set_rate_near(handle, params, &rrate, 0);
+ if (err < 0)
+ {
+ printf("Rate %iHz not available for playback: %s\n", rate, snd_strerror(err));
+ return err;
+ }
+ if (rrate != sample_rate)
+ {
+ printf("Rate doesn't match (requested %iHz, get %iHz)\n", sample_rate, err);
+ return -EINVAL;
+ }
+
+ /* set the buffer size */
+ err = snd_pcm_hw_params_set_buffer_size_near(handle, params, &buffer_size);
+ if (err < 0)
+ {
+ printf("Unable to set buffer size %i for playback: %s\n", buffer_size, snd_strerror(err));
+ return err;
+ }
+
+ /* set the period size */
+ err = snd_pcm_hw_params_set_period_size_near (handle, params, &period_size, NULL);
+ if (err < 0)
+ {
+ printf("Unable to set period size %i for playback: %s\n", period_size, snd_strerror(err));
+ return err;
+ }
+ if (!frames)
+ frames = malloc(period_size * channels * sizeof(short));
+
+ /* write the parameters to device */
+ err = snd_pcm_hw_params(handle, params);
+ if (err < 0)
+ {
+ printf("Unable to set hw params for playback: %s\n", snd_strerror(err));
+ return err;
+ }
+ return 0;
+}
+
+/* Set sw params: playback start threshold and low buffer watermark */
+static int set_swparams(snd_pcm_t *handle)
+{
+ int err;
+
+ snd_pcm_sw_params_t *swparams;
+ snd_pcm_sw_params_alloca(&swparams);
+
+ /* get the current swparams */
+ err = snd_pcm_sw_params_current(handle, swparams);
+ if (err < 0)
+ {
+ printf("Unable to determine current swparams for playback: %s\n", snd_strerror(err));
+ return err;
+ }
+ /* start the transfer when the buffer is haalmost full */
+ err = snd_pcm_sw_params_set_start_threshold(handle, swparams, buffer_size / 2);
+ if (err < 0)
+ {
+ printf("Unable to set start threshold mode for playback: %s\n", snd_strerror(err));
+ return err;
+ }
+ /* allow the transfer when at least period_size samples can be processed */
+ err = snd_pcm_sw_params_set_avail_min(handle, swparams, period_size);
+ if (err < 0)
+ {
+ printf("Unable to set avail min for playback: %s\n", snd_strerror(err));
+ return err;
+ }
+ /* write the parameters to the playback device */
+ err = snd_pcm_sw_params(handle, swparams);
+ if (err < 0)
+ {
+ printf("Unable to set sw params for playback: %s\n", snd_strerror(err));
+ return err;
+ }
+ return 0;
+}
+
+/* copy pcm samples to a spare buffer, suitable for snd_pcm_writei() */
+static bool fill_frames(void)
+{
+ ssize_t copy_n, frames_left = period_size;
+ bool new_buffer = false;
+
+ while (frames_left > 0)
+ {
+ if (!pcm_size)
+ {
+ new_buffer = true;
+ pcm_play_get_more_callback((void **)&pcm_data, &pcm_size);
+ if (!pcm_size || !pcm_data)
+ return false;
+ }
+ copy_n = MIN((ssize_t)pcm_size, frames_left*4);
+ memcpy(&frames[2*(period_size-frames_left)], pcm_data, copy_n);
+
+ pcm_data += copy_n;
+ pcm_size -= copy_n;
+ frames_left -= copy_n/4;
+
+ if (new_buffer)
+ {
+ new_buffer = false;
+ pcm_play_dma_started_callback();
+ }
+ }
+ return true;
+}
+
+#ifdef USE_ASYNC_CALLBACK
+static void async_callback(snd_async_handler_t *ahandler)
+{
+ snd_pcm_t *handle = snd_async_handler_get_pcm(ahandler);
+
+ if (pthread_mutex_trylock(&pcm_mtx) != 0)
+ return;
+#else
+static void pcm_tick(void)
+{
+ if (snd_pcm_state(handle) != SND_PCM_STATE_RUNNING)
+ return;
+#endif
+
+ while (snd_pcm_avail_update(handle) >= period_size)
+ {
+ if (fill_frames())
+ {
+ int err = snd_pcm_writei(handle, frames, period_size);
+ if (err < 0 && err != period_size && err != -EAGAIN)
+ {
+ printf("Write error: written %i expected %li\n", err, period_size);
+ break;
+ }
+ }
+ else
+ {
+ DEBUGF("%s: No Data.\n", __func__);
+ break;
+ }
+ }
+#ifdef USE_ASYNC_CALLBACK
+ pthread_mutex_unlock(&pcm_mtx);
+#endif
+}
+
+static int async_rw(snd_pcm_t *handle)
+{
+ int err;
+ snd_pcm_sframes_t sample_size;
+ short *samples;
+
+#ifdef USE_ASYNC_CALLBACK
+ err = snd_async_add_pcm_handler(&ahandler, handle, async_callback, NULL);
+ if (err < 0)
+ {
+ DEBUGF("Unable to register async handler: %s\n", snd_strerror(err));
+ return err;
+ }
+#endif
+
+ /* fill buffer with silence to initiate playback without noisy click */
+ sample_size = buffer_size;
+ samples = malloc(sample_size * channels * sizeof(short));
+
+ snd_pcm_format_set_silence(format, samples, sample_size);
+ err = snd_pcm_writei(handle, samples, sample_size);
+ free(samples);
+
+ if (err < 0)
+ {
+ DEBUGF("Initial write error: %s\n", snd_strerror(err));
+ return err;
+ }
+ if (err != (ssize_t)sample_size)
+ {
+ DEBUGF("Initial write error: written %i expected %li\n", err, sample_size);
+ return err;
+ }
+ if (snd_pcm_state(handle) == SND_PCM_STATE_PREPARED)
+ {
+ err = snd_pcm_start(handle);
+ if (err < 0)
+ {
+ DEBUGF("Start error: %s\n", snd_strerror(err));
+ return err;
+ }
+ }
+ return 0;
+}
+
+
+void cleanup(void)
+{
+ free(frames);
+ frames = NULL;
+ snd_pcm_close(handle);
+}
+
+
+void pcm_play_dma_init(void)
+{
+ int err;
+
+
+ if ((err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0)
+ {
+ printf("%s(): Cannot open device %s: %s\n", __func__, device, snd_strerror(err));
+ exit(EXIT_FAILURE);
+ return;
+ }
+
+ if ((err = snd_pcm_nonblock(handle, 1)))
+ printf("Could not set non-block mode: %s\n", snd_strerror(err));
+
+ if ((err = set_hwparams(handle, rate)) < 0)
+ {
+ printf("Setting of hwparams failed: %s\n", snd_strerror(err));
+ exit(EXIT_FAILURE);
+ }
+ if ((err = set_swparams(handle)) < 0)
+ {
+ printf("Setting of swparams failed: %s\n", snd_strerror(err));
+ exit(EXIT_FAILURE);
+ }
+
+#ifdef USE_ASYNC_CALLBACK
+ pthread_mutexattr_t attr;
+ pthread_mutexattr_init(&attr);
+ pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+ pthread_mutex_init(&pcm_mtx, &attr);
+#else
+ tick_add_task(pcm_tick);
+#endif
+
+
+ atexit(cleanup);
+ return;
+}
+
+
+void pcm_play_lock(void)
+{
+#ifdef USE_ASYNC_CALLBACK
+ pthread_mutex_lock(&pcm_mtx);
+#else
+ if (recursion++ == 0)
+ tick_remove_task(pcm_tick);
+#endif
+}
+
+void pcm_play_unlock(void)
+{
+#ifdef USE_ASYNC_CALLBACK
+ pthread_mutex_unlock(&pcm_mtx);
+#else
+ if (--recursion == 0)
+ tick_add_task(pcm_tick);
+#endif
+}
+
+static void pcm_dma_apply_settings_nolock(void)
+{
+ snd_pcm_drop(handle);
+ set_hwparams(handle, pcm_sampr);
+}
+
+void pcm_dma_apply_settings(void)
+{
+ pcm_play_lock();
+ pcm_dma_apply_settings_nolock();
+ pcm_play_unlock();
+}
+
+
+void pcm_play_dma_pause(bool pause)
+{
+ snd_pcm_pause(handle, pause);
+}
+
+
+void pcm_play_dma_stop(void)
+{
+ snd_pcm_drain(handle);
+}
+
+void pcm_play_dma_start(const void *addr, size_t size)
+{
+ pcm_dma_apply_settings_nolock();
+
+ pcm_data = addr;
+ pcm_size = size;
+
+ while (1)
+ {
+ snd_pcm_state_t state = snd_pcm_state(handle);
+ switch (state)
+ {
+ case SND_PCM_STATE_RUNNING:
+ return;
+ case SND_PCM_STATE_XRUN:
+ {
+ DEBUGF("Trying to recover from error\n");
+ int err = snd_pcm_recover(handle, -EPIPE, 0);
+ if (err < 0)
+ DEBUGF("Recovery failed: %s\n", snd_strerror(err));
+ continue;
+ }
+ case SND_PCM_STATE_SETUP:
+ {
+ int err = snd_pcm_prepare(handle);
+ if (err < 0)
+ printf("Prepare error: %s\n", snd_strerror(err));
+ /* fall through */
+ }
+ case SND_PCM_STATE_PREPARED:
+ { /* prepared state, we need to fill the buffer with silence before
+ * starting */
+ int err = async_rw(handle);
+ if (err < 0)
+ printf("Start error: %s\n", snd_strerror(err));
+ return;
+ }
+ case SND_PCM_STATE_PAUSED:
+ { /* paused, simply resume */
+ pcm_play_dma_pause(0);
+ return;
+ }
+ case SND_PCM_STATE_DRAINING:
+ /* run until drained */
+ continue;
+ default:
+ DEBUGF("Unhandled state: %s\n", snd_pcm_state_name(state));
+ return;
+ }
+ }
+}
+
+size_t pcm_get_bytes_waiting(void)
+{
+ return pcm_size;
+}
+
+const void * pcm_play_dma_get_peak_buffer(int *count)
+{
+ uintptr_t addr = (uintptr_t)pcm_data;
+ *count = pcm_size / 4;
+ return (void *)((addr + 3) & ~3);
+}
+
+void pcm_play_dma_postinit(void)
+{
+}
+
+
+void pcm_set_mixer_volume(int volume)
+{
+ (void)volume;
+}
+#ifdef HAVE_RECORDING
+void pcm_rec_lock(void)
+{
+}
+
+void pcm_rec_unlock(void)
+{
+}
+
+void pcm_rec_dma_init(void)
+{
+}
+
+void pcm_rec_dma_close(void)
+{
+}
+
+void pcm_rec_dma_start(void *start, size_t size)
+{
+ (void)start;
+ (void)size;
+}
+
+void pcm_rec_dma_stop(void)
+{
+}
+
+const void * pcm_rec_dma_get_peak_buffer(void)
+{
+ return NULL;
+}
+
+void audiohw_set_recvol(int left, int right, int type)
+{
+ (void)left;
+ (void)right;
+ (void)type;
+}
+
+#endif /* HAVE_RECORDING */