Merge pull request #210 from rohkkumar/plugin_example
tinyalsa: Add sample pcm/mixer plugin and sample sndcardparser
diff --git a/Android.bp b/Android.bp
index d6fec57..a36a923 100644
--- a/Android.bp
+++ b/Android.bp
@@ -63,6 +63,12 @@
},
}
+cc_library_headers {
+ name: "libtinyalsav2_headers",
+ export_include_dirs: ["include"],
+ vendor_available: true,
+}
+
cc_binary {
name: "tinyplay2",
host_supported: true,
diff --git a/examples/plugins/Android.bp b/examples/plugins/Android.bp
new file mode 100644
index 0000000..840480e
--- /dev/null
+++ b/examples/plugins/Android.bp
@@ -0,0 +1,15 @@
+cc_library {
+ name: "libtinyalsav2_example_plugin_pcm",
+ vendor: true,
+ srcs: ["sample_pcm_plugin.c"],
+ cflags: ["-Werror", "-Wno-unused-parameter"],
+ header_libs: ["libtinyalsav2_headers"],
+}
+
+cc_library {
+ name: "libtinyalsav2_example_plugin_mixer",
+ vendor: true,
+ srcs: ["sample_mixer_plugin.c"],
+ cflags: ["-Werror", "-Wno-unused-parameter"],
+ header_libs: ["libtinyalsav2_headers"],
+}
diff --git a/examples/plugins/sample_mixer_plugin.c b/examples/plugins/sample_mixer_plugin.c
new file mode 100644
index 0000000..e1a7567
--- /dev/null
+++ b/examples/plugins/sample_mixer_plugin.c
@@ -0,0 +1,319 @@
+/*
+** Copyright (c) 2021, The Linux Foundation. All rights reserved.
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above
+** copyright notice, this list of conditions and the following
+** disclaimer in the documentation and/or other materials provided
+** with the distribution.
+** * Neither the name of The Linux Foundation nor the names of its
+** contributors may be used to endorse or promote products derived
+** from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+**/
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sound/asound.h>
+#include <tinyalsa/plugin.h>
+#include <tinyalsa/asoundlib.h>
+
+#define SAMPLE_MIXER_PRIV_GET_CTL_PTR(p, idx) (p->ctls + idx)
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
+
+static const char *const sample_enum_text[] = {"One", "Two", "Three"};
+
+struct sample_mixer_priv {
+ struct snd_control *ctls;
+ int ctl_count;
+
+ struct snd_value_enum sample_enum;
+
+ mixer_event_callback event_cb;
+};
+
+static int sample_mixer_int_ctl_get(struct mixer_plugin *plugin,
+ struct snd_control *ctl, struct snd_ctl_elem_value *ev)
+{
+ return 0;
+}
+
+static int sample_mixer_int_ctl_put(struct mixer_plugin *plugin,
+ struct snd_control *ctl, struct snd_ctl_elem_value *ev)
+{
+/*
+ * Integer values can be retrieved using:
+ * uint32_t val1 = (uint32_t)ev->value.integer.value[0];
+ * uint32_t val2 = (uint32_t)ev->value.integer.value[1];
+ * uint32_t val3 = (uint32_t)ev->value.integer.value[2];
+ */
+ return 0;
+}
+
+static int sample_mixer_byte_array_ctl_get(struct mixer_plugin *plugin,
+ struct snd_control *ctl, struct snd_ctl_elem_value *ev)
+{
+ return 0;
+}
+
+static int sample_mixer_byte_array_ctl_put(struct mixer_plugin *plugin,
+ struct snd_control *ctl, struct snd_ctl_elem_value *ev)
+{
+/*
+ * Byte array payload can be retrieved using:
+ * void *payload = ev->value.bytes.data;
+ */
+
+ return 0;
+}
+
+static int sample_mixer_tlv_ctl_get(struct mixer_plugin *plugin,
+ struct snd_control *ctl, struct snd_ctl_tlv *ev)
+{
+ return 0;
+}
+
+static int sample_mixer_tlv_ctl_put(struct mixer_plugin *plugin,
+ struct snd_control *ctl, struct snd_ctl_tlv *tlv)
+{
+/*
+ * TLV payload and len can be retrieved using:
+ * void *payload = &tlv->tlv[0];
+ * size_t tlv_size = tlv->length;
+ */
+
+ return 0;
+}
+
+static int sample_mixer_enum_ctl_get(struct mixer_plugin *plugin,
+ struct snd_control *ctl, struct snd_ctl_elem_value *ev)
+{
+ return 0;
+}
+
+static int sample_mixer_enum_ctl_put(struct mixer_plugin *plugin,
+ struct snd_control *ctl, struct snd_ctl_elem_value *ev)
+{
+/*
+ * Enum value can be retrieved using:
+ * unsigned int val = ev->value.enumerated.item[0];
+ */
+ return 0;
+}
+
+static struct snd_value_int sample_mixer_ctl_value_int =
+ SND_VALUE_INTEGER(3, 0, 1000, 100);
+
+/* 512 max bytes for non-tlv byte controls */
+static struct snd_value_bytes byte_array_ctl_bytes =
+ SND_VALUE_BYTES(512);
+
+static struct snd_value_tlv_bytes sample_mixer_tlv_ctl_bytes =
+ SND_VALUE_TLV_BYTES(1024, sample_mixer_tlv_ctl_get, sample_mixer_tlv_ctl_put);
+
+static void create_integer_ctl(struct sample_mixer_priv *priv,
+ int ctl_idx, int pval, void *pdata)
+{
+ struct snd_control *ctl = SAMPLE_MIXER_PRIV_GET_CTL_PTR(priv, ctl_idx);
+ char *ctl_name = strdup("Sample integer control");
+
+ /* pval and pdata can be retrieved using snd_control during get()/put() */
+ INIT_SND_CONTROL_INTEGER(ctl, ctl_name, sample_mixer_int_ctl_get,
+ sample_mixer_int_ctl_put, sample_mixer_ctl_value_int, pval, pdata);
+}
+
+static void create_byte_array_ctl(struct sample_mixer_priv *priv,
+ int ctl_idx, int pval, void *pdata)
+{
+ struct snd_control *ctl = SAMPLE_MIXER_PRIV_GET_CTL_PTR(priv, ctl_idx);
+ char *ctl_name = strdup("Sample byte array control");
+
+ INIT_SND_CONTROL_BYTES(ctl, ctl_name, sample_mixer_byte_array_ctl_get,
+ sample_mixer_byte_array_ctl_put, byte_array_ctl_bytes,
+ pval, pdata);
+}
+
+static void create_tlv_ctl(struct sample_mixer_priv *priv,
+ int ctl_idx, int pval, void *pdata)
+{
+ struct snd_control *ctl = SAMPLE_MIXER_PRIV_GET_CTL_PTR(priv, ctl_idx);
+ char *ctl_name = strdup("Sample tlv control");
+
+ INIT_SND_CONTROL_TLV_BYTES(ctl, ctl_name, sample_mixer_tlv_ctl_bytes,
+ pval, pdata);
+}
+
+static void create_enum_ctl(struct sample_mixer_priv *priv,
+ int ctl_idx, struct snd_value_enum *e,
+ int pval, void *pdata)
+{
+ struct snd_control *ctl = SAMPLE_MIXER_PRIV_GET_CTL_PTR(priv, ctl_idx);
+ char *ctl_name = strdup("Sample enum control");
+
+ INIT_SND_CONTROL_ENUM(ctl, ctl_name, sample_mixer_enum_ctl_get,
+ sample_mixer_enum_ctl_put, e, pval, pdata);
+}
+
+static int sample_mixer_form_ctls(struct sample_mixer_priv *priv, int ctl_idx)
+{
+ create_integer_ctl(priv, ctl_idx, 0, NULL);
+ ctl_idx++;
+ create_byte_array_ctl(priv, ctl_idx, 0, NULL);
+ ctl_idx++;
+ create_tlv_ctl(priv, ctl_idx, 0, NULL);
+ ctl_idx++;
+ create_enum_ctl(priv, ctl_idx, &priv->sample_enum, 0, NULL);
+ ctl_idx++;
+
+ return 0;
+}
+
+static ssize_t sample_mixer_read_event(struct mixer_plugin *plugin,
+ struct snd_ctl_event *ev, size_t size)
+{
+ /* Fill snd_ctl_event *ev before sending.
+ * Return : sizeof(struct snd_ctl_event),
+ * 0 in case no event present.
+ */
+
+ return 0;
+}
+
+static int sample_mixer_subscribe_events(struct mixer_plugin *plugin,
+ mixer_event_callback event_cb)
+{
+ struct sample_mixer_priv *priv = plugin->priv;
+
+ priv->event_cb = event_cb;
+ /* event_cb is the callback function which needs to be called
+ * when an event occurs. This will unblock poll() on mixer fd
+ * which is called from mixer_wait_event().
+ * Once poll is unblocked, clients can call mixer_read_event()
+ * During unsubscribe(), event_cb is NULL.
+ */
+ return 0;
+}
+
+static int sample_mixer_alloc_ctls(struct sample_mixer_priv *priv)
+{
+ int ret = 0, i;
+
+ priv->ctls = calloc(priv->ctl_count, sizeof(*priv->ctls));
+ if (!priv->ctls) {
+ return -ENOMEM;
+ }
+
+ priv->sample_enum.items = ARRAY_SIZE(sample_enum_text);
+ priv->sample_enum.texts = calloc(priv->sample_enum.items, sizeof(*priv->sample_enum.texts));
+
+ for (i = 0; i < ARRAY_SIZE(sample_enum_text); i++)
+ priv->sample_enum.texts[i] = strdup(sample_enum_text[i]);
+
+ return sample_mixer_form_ctls(priv, 0);
+}
+
+static void sample_mixer_free_ctls(struct sample_mixer_priv *priv)
+{
+ int num_enums, i;
+ struct snd_control *ctl = NULL;
+
+ for (i = 0; i < priv->ctl_count; i++) {
+ ctl = SAMPLE_MIXER_PRIV_GET_CTL_PTR(priv, i);
+ if (ctl->name)
+ free((void *)ctl->name);
+ }
+
+ num_enums = priv->sample_enum.items;
+
+ for (i = 0; i < num_enums; i++)
+ free(priv->sample_enum.texts[i]);
+
+ free(priv->sample_enum.texts);
+ priv->ctl_count = 0;
+
+ if (priv->ctls) {
+ free(priv->ctls);
+ priv->ctls = NULL;
+ }
+}
+
+static void sample_mixer_close(struct mixer_plugin **plugin)
+{
+ struct mixer_plugin *mp = *plugin;
+ struct sample_mixer_priv *priv = mp->priv;
+
+ /* unblock mixer event during close */
+ if (priv->event_cb)
+ priv->event_cb(mp);
+ sample_mixer_subscribe_events(mp, NULL);
+ sample_mixer_free_ctls(priv);
+ free(priv);
+ free(*plugin);
+ *plugin = NULL;
+}
+
+int sample_mixer_open(struct mixer_plugin **plugin, unsigned int card)
+{
+ struct mixer_plugin *mp;
+ struct sample_mixer_priv *priv;
+ int i, ret = 0;
+ int ctl_cnt = 4;
+
+ mp = calloc(1, sizeof(*mp));
+ if (!mp) {
+ return -ENOMEM;
+ }
+
+ priv = calloc(1, sizeof(*priv));
+ if (!priv) {
+ ret = -ENOMEM;
+ goto err_priv_alloc;
+ }
+
+ priv->ctl_count = ctl_cnt;
+ ret = sample_mixer_alloc_ctls(priv);
+ if (ret)
+ goto err_ctls_alloc;
+
+ /* Register the controls */
+ mp->controls = priv->ctls;
+ mp->num_controls = priv->ctl_count;
+ mp->priv = priv;
+ *plugin = mp;
+
+ return 0;
+
+err_ctls_alloc:
+ sample_mixer_free_ctls(priv);
+ free(priv);
+
+err_priv_alloc:
+ free(mp);
+ return ret;
+}
+
+struct mixer_plugin_ops mixer_plugin_ops = {
+ .open = sample_mixer_open,
+ .close = sample_mixer_close,
+ .subscribe_events = sample_mixer_subscribe_events,
+ .read_event = sample_mixer_read_event,
+};
diff --git a/examples/plugins/sample_pcm_plugin.c b/examples/plugins/sample_pcm_plugin.c
new file mode 100644
index 0000000..3b02435
--- /dev/null
+++ b/examples/plugins/sample_pcm_plugin.c
@@ -0,0 +1,331 @@
+/*
+** Copyright (c) 2021, The Linux Foundation. All rights reserved.
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above
+** copyright notice, this list of conditions and the following
+** disclaimer in the documentation and/or other materials provided
+** with the distribution.
+** * Neither the name of The Linux Foundation nor the names of its
+** contributors may be used to endorse or promote products derived
+** from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+**/
+
+#include <errno.h>
+#include <limits.h>
+#include <sys/time.h>
+#include <sys/mman.h>
+#include <sound/asound.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <strings.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <tinyalsa/plugin.h>
+#include <tinyalsa/asoundlib.h>
+
+/* 2 words of uint32_t = 64 bits of mask */
+#define PCM_MASK_SIZE (2)
+#define PCM_FORMAT_BIT(x) (1ULL << x)
+
+struct sample_pcm_priv {
+ FILE *fptr;
+ int session_id;
+ int channels;
+ int bitwidth;
+ int sample_rate;
+ unsigned int period_size;
+ snd_pcm_uframes_t total_size_frames;
+};
+
+struct pcm_plugin_hw_constraints sample_pcm_constrs = {
+ .access = 0,
+ .format = 0,
+ .bit_width = {
+ .min = 16,
+ .max = 32,
+ },
+ .channels = {
+ .min = 1,
+ .max = 8,
+ },
+ .rate = {
+ .min = 8000,
+ .max = 384000,
+ },
+ .periods = {
+ .min = 1,
+ .max = 8,
+ },
+ .period_bytes = {
+ .min = 96,
+ .max = 122880,
+ },
+};
+
+static inline struct snd_interval *param_to_interval(struct snd_pcm_hw_params *p,
+ int n)
+{
+ return &(p->intervals[n - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]);
+}
+
+static inline int param_is_interval(int p)
+{
+ return (p >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL) &&
+ (p <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL);
+}
+
+static unsigned int param_get_int(struct snd_pcm_hw_params *p, int n)
+{
+ if (param_is_interval(n)) {
+ struct snd_interval *i = param_to_interval(p, n);
+ if (i->integer)
+ return i->max;
+ }
+ return 0;
+}
+
+static inline struct snd_mask *param_to_mask(struct snd_pcm_hw_params *p, int n)
+{
+ return &(p->masks[n - SNDRV_PCM_HW_PARAM_FIRST_MASK]);
+}
+
+static inline int param_is_mask(int p)
+{
+ return (p >= SNDRV_PCM_HW_PARAM_FIRST_MASK) &&
+ (p <= SNDRV_PCM_HW_PARAM_LAST_MASK);
+}
+
+static inline int snd_mask_val(const struct snd_mask *mask)
+{
+ int i;
+ for (i = 0; i < PCM_MASK_SIZE; i++) {
+ if (mask->bits[i])
+ return ffs(mask->bits[i]) + (i << 5) - 1;
+ }
+ return 0;
+}
+
+static int alsaformat_to_bitwidth(int format)
+{
+ switch (format) {
+ case SNDRV_PCM_FORMAT_S32_LE:
+ case SNDRV_PCM_FORMAT_S24_LE:
+ return 32;
+ case SNDRV_PCM_FORMAT_S8:
+ return 8;
+ case SNDRV_PCM_FORMAT_S24_3LE:
+ return 24;
+ default:
+ case SNDRV_PCM_FORMAT_S16_LE:
+ return 16;
+ };
+}
+
+static int param_get_mask_val(struct snd_pcm_hw_params *p,
+ int n)
+{
+ if (param_is_mask(n)) {
+ struct snd_mask *m = param_to_mask(p, n);
+ int val = snd_mask_val(m);
+
+ return alsaformat_to_bitwidth(val);
+ }
+ return 0;
+}
+
+static int sample_session_open(int sess_id, unsigned int mode, struct sample_pcm_priv *priv)
+{
+ char fname[128];
+
+ snprintf(fname, 128, "sample_pcm_data_%d.raw", sess_id);
+ priv->fptr = fopen(fname,"rwb+");
+ if (priv->fptr == NULL) {
+ return -EIO;
+ }
+ rewind(priv->fptr);
+ return 0;
+}
+
+
+static int sample_session_write(struct sample_pcm_priv *priv, void *buff, size_t count)
+{
+ uint8_t *data = (uint8_t *)buff;
+ size_t len;
+
+ len = fwrite(buff, 1, count, priv->fptr);
+
+ if (len != count)
+ return -EIO;
+
+ return 0;
+}
+
+static int sample_pcm_hw_params(struct pcm_plugin *plugin,
+ struct snd_pcm_hw_params *params)
+{
+ struct sample_pcm_priv *priv = plugin->priv;
+
+ priv->sample_rate = param_get_int(params, SNDRV_PCM_HW_PARAM_RATE);
+ priv->channels = param_get_int(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+ priv->bitwidth = param_get_mask_val(params, SNDRV_PCM_HW_PARAM_FORMAT);
+
+ return 0;
+}
+
+static int sample_pcm_sw_params(struct pcm_plugin *plugin,
+ struct snd_pcm_sw_params *sparams)
+{
+ return 0;
+}
+
+static int sample_pcm_sync_ptr(struct pcm_plugin *plugin,
+ struct snd_pcm_sync_ptr *sync_ptr)
+{
+ return 0;
+}
+
+static int sample_pcm_writei_frames(struct pcm_plugin *plugin, struct snd_xferi *x)
+{
+ struct sample_pcm_priv *priv = plugin->priv;
+ void *buff;
+ size_t count;
+
+ buff = x->buf;
+ count = x->frames * (priv->channels * (priv->bitwidth) / 8);
+
+ return sample_session_write(priv, buff, count);
+}
+
+static int sample_pcm_readi_frames(struct pcm_plugin *plugin, struct snd_xferi *x)
+{
+ return 0;
+}
+
+static int sample_pcm_ttstamp(struct pcm_plugin *plugin, int *tstamp)
+{
+ return 0;
+}
+
+static int sample_pcm_prepare(struct pcm_plugin *plugin)
+{
+ return 0;
+}
+
+static int sample_pcm_start(struct pcm_plugin *plugin)
+{
+ return 0;
+}
+
+static int sample_pcm_drop(struct pcm_plugin *plugin)
+{
+ return 0;
+}
+
+static int sample_pcm_close(struct pcm_plugin *plugin)
+{
+ struct sample_pcm_priv *priv = plugin->priv;
+ int ret = 0;
+
+ fclose(priv->fptr);
+ free(plugin->priv);
+ free(plugin);
+
+ return ret;
+}
+
+static int sample_pcm_poll(struct pcm_plugin *plugin, struct pollfd *pfd,
+ nfds_t nfds, int timeout)
+{
+ return 0;
+}
+
+static void* sample_pcm_mmap(struct pcm_plugin *plugin, void *addr, size_t length, int prot,
+ int flags, off_t offset)
+{
+ return MAP_FAILED;
+}
+
+static int sample_pcm_munmap(struct pcm_plugin *plugin, void *addr, size_t length)
+{
+ return 0;
+}
+
+int sample_pcm_open(struct pcm_plugin **plugin, unsigned int card,
+ unsigned int device, unsigned int mode)
+{
+ struct pcm_plugin *sample_pcm_plugin;
+ struct sample_pcm_priv *priv;
+ int ret = 0, session_id = device;
+
+ sample_pcm_plugin = calloc(1, sizeof(struct pcm_plugin));
+ if (!sample_pcm_plugin)
+ return -ENOMEM;
+
+ priv = calloc(1, sizeof(struct sample_pcm_priv));
+ if (!priv) {
+ ret = -ENOMEM;
+ goto err_plugin_free;
+ }
+
+ sample_pcm_constrs.access = (PCM_FORMAT_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED) |
+ PCM_FORMAT_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED));
+ sample_pcm_constrs.format = (PCM_FORMAT_BIT(SNDRV_PCM_FORMAT_S16_LE) |
+ PCM_FORMAT_BIT(SNDRV_PCM_FORMAT_S24_LE) |
+ PCM_FORMAT_BIT(SNDRV_PCM_FORMAT_S24_3LE) |
+ PCM_FORMAT_BIT(SNDRV_PCM_FORMAT_S32_LE));
+
+ sample_pcm_plugin->card = card;
+ sample_pcm_plugin->mode = mode;
+ sample_pcm_plugin->constraints = &sample_pcm_constrs;
+ sample_pcm_plugin->priv = priv;
+
+ priv->session_id = session_id;
+
+ ret = sample_session_open(session_id, mode, priv);
+ if (ret) {
+ errno = -ret;
+ goto err_priv_free;
+ }
+ *plugin = sample_pcm_plugin;
+ return 0;
+
+err_priv_free:
+ free(priv);
+err_plugin_free:
+ free(sample_pcm_plugin);
+ return ret;
+}
+
+struct pcm_plugin_ops pcm_plugin_ops = {
+ .open = sample_pcm_open,
+ .close = sample_pcm_close,
+ .hw_params = sample_pcm_hw_params,
+ .sw_params = sample_pcm_sw_params,
+ .sync_ptr = sample_pcm_sync_ptr,
+ .writei_frames = sample_pcm_writei_frames,
+ .readi_frames = sample_pcm_readi_frames,
+ .ttstamp = sample_pcm_ttstamp,
+ .prepare = sample_pcm_prepare,
+ .start = sample_pcm_start,
+ .drop = sample_pcm_drop,
+ .mmap = sample_pcm_mmap,
+ .munmap = sample_pcm_munmap,
+ .poll = sample_pcm_poll,
+};
diff --git a/examples/sndcardparser/Android.bp b/examples/sndcardparser/Android.bp
new file mode 100644
index 0000000..9ca8812
--- /dev/null
+++ b/examples/sndcardparser/Android.bp
@@ -0,0 +1,7 @@
+cc_library {
+ name: "libsndcardparser_example",
+ vendor: true,
+ srcs: ["sample_sndcardparser.c"],
+ cflags: ["-Werror"],
+}
+
diff --git a/examples/sndcardparser/sample_sndcardparser.c b/examples/sndcardparser/sample_sndcardparser.c
new file mode 100644
index 0000000..90e3d12
--- /dev/null
+++ b/examples/sndcardparser/sample_sndcardparser.c
@@ -0,0 +1,269 @@
+/*
+** Copyright (c) 2021, The Linux Foundation. All rights reserved.
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above
+** copyright notice, this list of conditions and the following
+** disclaimer in the documentation and/or other materials provided
+** with the distribution.
+** * Neither the name of The Linux Foundation nor the names of its
+** contributors may be used to endorse or promote products derived
+** from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+**/
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
+
+#define VIRTUAL_SND_CARD_ID 100
+#define MAX_PATH 256
+#define BUF_SIZE 1024
+
+enum snd_node_type {
+ NODE_TYPE_HW = 0,
+ NODE_TYPE_PLUGIN,
+ NODE_TYPE_INVALID,
+};
+
+enum {
+ NODE_PCM,
+ NODE_COMPR,
+ NODE_MIXER,
+ NODE_MAX,
+};
+
+struct snd_node_ops {
+ /** Function pointer to get card definition */
+ void* (*open_card)(unsigned int card);
+ /** Function pointer to release card definition */
+ void (*close_card)(void *card);
+ /** Get interger type properties from device definition */
+ int (*get_int)(void *node, const char *prop, int *val);
+ /** Get string type properties from device definition */
+ int (*get_str)(void *node, const char *prop, char **val);
+ /** Function pointer to get mixer definition */
+ void* (*get_mixer)(void *card);
+ /** Function pointer to get PCM definition */
+ void* (*get_pcm)(void *card, unsigned int id);
+ /** Function pointer to get COMPRESS definition */
+ void* (*get_compress)(void *card, unsigned int id);
+};
+
+struct snd_dev_def {
+ unsigned int device;
+ int type;
+ const char *name;
+ const char *so_name;
+ int playback; //used only for pcm node
+ int capture; //used only for pcm node
+ /* add custom props here */
+};
+
+struct snd_dev_def_card {
+ unsigned int card;
+ char *name;
+
+ /* child device details */
+ int num_pcm_nodes;
+ struct snd_dev_def *pcm_dev_def;
+
+ struct snd_dev_def *mixer_dev_def;
+};
+
+struct snd_dev_def pcm_devs[] = {
+ {100, NODE_TYPE_PLUGIN, "PCM100", "libtinyalsav2_example_plugin_pcm.so", 1, 0},
+ /* Add other plugin info here */
+};
+
+struct snd_dev_def mixer_dev =
+ {VIRTUAL_SND_CARD_ID, NODE_TYPE_PLUGIN, "virtual-snd-card", "libtinyalsav2_example_plugin_mixer.so", 0, 0};
+
+void *snd_card_def_open_card(unsigned int card)
+{
+ struct snd_dev_def_card *card_def = NULL;
+ struct snd_dev_def *pcm_dev_def = NULL;
+ struct snd_dev_def *mixer_dev_def = NULL;
+ int num_pcm = ARRAY_SIZE(pcm_devs);
+ int i;
+
+ if (card != VIRTUAL_SND_CARD_ID)
+ return NULL;
+
+ card_def = calloc(1, sizeof(struct snd_dev_def_card));
+ if (!card_def)
+ return card_def;
+
+ card_def->card = card;
+ card_def->name = strdup("virtual-snd-card");
+
+ /* fill pcm device node info */
+ card_def->num_pcm_nodes = num_pcm;
+ pcm_dev_def = calloc(num_pcm, sizeof(struct snd_dev_def));
+ if (!pcm_dev_def)
+ goto free_card_def;
+
+ for (i = 0; i < num_pcm; i++)
+ memcpy(&pcm_dev_def[i], &pcm_devs[i], sizeof(struct snd_dev_def));
+
+ card_def->pcm_dev_def = pcm_dev_def;
+
+ /* fill mixer device node info */
+ mixer_dev_def = calloc(1, sizeof(struct snd_dev_def));
+ if (!mixer_dev_def)
+ goto free_pcm_dev;
+
+ memcpy(mixer_dev_def, &mixer_dev, sizeof(struct snd_dev_def));
+
+ card_def->mixer_dev_def = mixer_dev_def;
+ return card_def;
+free_pcm_dev:
+ free(pcm_dev_def);
+free_card_def:
+ free(card_def->name);
+ free(card_def);
+ return NULL;
+}
+
+void snd_card_def_close_card(void *card_node)
+{
+ struct snd_dev_def_card *defs = (struct snd_dev_def_card *)card_node;
+ struct snd_dev_def *pcm_dev_def = NULL;
+ struct snd_dev_def *mixer_dev_def = NULL;
+
+ if (!defs)
+ return;
+
+ pcm_dev_def = defs->pcm_dev_def;
+ if (pcm_dev_def)
+ free(pcm_dev_def);
+
+ mixer_dev_def = defs->mixer_dev_def;
+ if (!mixer_dev_def)
+ goto free_defs;
+
+ free(mixer_dev_def);
+free_defs:
+ free(defs->name);
+ free(defs);
+}
+
+void *snd_card_def_get_node(void *card_node, unsigned int id, int type)
+{
+ struct snd_dev_def_card *card_def = (struct snd_dev_def_card *)card_node;
+ struct snd_dev_def *dev_def = NULL;
+ int i;
+
+ if (!card_def)
+ return NULL;
+
+ if (type >= NODE_MAX)
+ return NULL;
+
+ if (type == NODE_MIXER)
+ return card_def->mixer_dev_def;
+
+ if (type == NODE_PCM)
+ dev_def = card_def->pcm_dev_def;
+
+ for (i = 0; i < card_def->num_pcm_nodes; i++) {
+ if (dev_def[i].device == id) {
+ return &dev_def[i];
+ }
+ }
+
+ return NULL;
+}
+
+int snd_card_def_get_int(void *node, const char *prop, int *val)
+{
+ struct snd_dev_def *dev_def = (struct snd_dev_def *)node;
+ int ret = -EINVAL;
+
+ if (!dev_def || !prop || !val)
+ return ret;
+
+ if (!strcmp(prop, "type")) {
+ *val = dev_def->type;
+ return 0;
+ } else if (!strcmp(prop, "id")) {
+ *val = dev_def->device;
+ return 0;
+ } else if (!strcmp(prop, "playback")) {
+ *val = dev_def->playback;
+ return 0;
+ } else if (!strcmp(prop, "capture")) {
+ *val = dev_def->capture;
+ return 0;
+ }
+
+ return ret;
+}
+
+int snd_card_def_get_str(void *node, const char *prop, char **val)
+{
+ struct snd_dev_def *dev_def = (struct snd_dev_def *)node;
+ int ret = -EINVAL;
+
+ if (!dev_def || !prop)
+ return ret;
+
+ if (!strcmp(prop, "so-name")) {
+ if (dev_def->so_name) {
+ *val = (char *)dev_def->so_name;
+ return 0;
+ }
+ }
+
+ if (!strcmp(prop, "name")) {
+ if (dev_def->name) {
+ *val = (char *)dev_def->name;
+ return 0;
+ }
+ }
+
+ return ret;
+}
+
+void *snd_card_def_get_pcm(void *card_node, unsigned int id)
+{
+ return snd_card_def_get_node(card_node, id, NODE_PCM);
+}
+
+void *snd_card_def_get_compress(void *card_node, unsigned int id)
+{
+ return snd_card_def_get_node(card_node, id, NODE_COMPR);
+}
+
+void *snd_card_def_get_mixer(void *card_node)
+{
+ return snd_card_def_get_node(card_node, 1, NODE_MIXER);
+}
+
+struct snd_node_ops snd_card_ops = {
+ .open_card = snd_card_def_open_card,
+ .close_card = snd_card_def_close_card,
+ .get_int = snd_card_def_get_int,
+ .get_str = snd_card_def_get_str,
+ .get_pcm = snd_card_def_get_pcm,
+ .get_compress = snd_card_def_get_compress,
+ .get_mixer = snd_card_def_get_mixer,
+};