mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-11-01 22:58:49 -04:00
mixer simple basic abstraction - added python binding
reasons: - rapid development - class-like code structure - more readable code features: - hcontrol binding is managed from python (opportunity to create virtual mixer without driver or join multiple cards to behave as one)
This commit is contained in:
Jaroslav Kysela
parent
582cc1f098
commit
e0d7bfcea6
9 changed files with 1436 additions and 33 deletions
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@ -55,6 +55,9 @@ typedef struct _class_priv {
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} class_priv_t;
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typedef int (*snd_mixer_sbasic_init_t)(snd_mixer_class_t *class);
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typedef int (*snd_mixer_sfbasic_init_t)(snd_mixer_class_t *class,
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snd_mixer_t *mixer,
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const char *device);
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#endif /* !DOC_HIDDEN */
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@ -62,10 +65,10 @@ static int try_open(snd_mixer_class_t *class, const char *lib)
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{
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class_priv_t *priv = snd_mixer_class_get_private(class);
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snd_mixer_event_t event_func;
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snd_mixer_sbasic_init_t init_func;
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snd_mixer_sbasic_init_t init_func = NULL;
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char *xlib, *path;
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void *h;
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int err;
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int err = 0;
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path = getenv("ALSA_MIXER_SIMPLE_MODULES");
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if (!path)
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@ -82,28 +85,71 @@ static int try_open(snd_mixer_class_t *class, const char *lib)
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free(xlib);
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return -ENXIO;
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}
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priv->dlhandle = h;
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event_func = snd_dlsym(h, "alsa_mixer_simple_event", NULL);
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if (event_func == NULL) {
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SNDERR("Symbol 'alsa_mixer_simple_event' was not found in '%s'", xlib);
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snd_dlclose(h);
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free(xlib);
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return -ENXIO;
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err = -ENXIO;
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}
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init_func = snd_dlsym(h, "alsa_mixer_simple_init", NULL);
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if (init_func == NULL) {
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SNDERR("Symbol 'alsa_mixer_simple_init' was not found in '%s'", xlib);
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snd_dlclose(h);
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free(xlib);
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return -ENXIO;
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if (err == 0) {
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init_func = snd_dlsym(h, "alsa_mixer_simple_init", NULL);
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if (init_func == NULL) {
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SNDERR("Symbol 'alsa_mixer_simple_init' was not found in '%s'", xlib);
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err = -ENXIO;
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}
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}
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free(xlib);
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err = init_func(class);
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if (err < 0) {
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snd_dlclose(h);
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err = err == 0 ? init_func(class) : err;
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if (err < 0)
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return err;
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}
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snd_mixer_class_set_event(class, event_func);
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return 1;
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}
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static int try_open_full(snd_mixer_class_t *class, snd_mixer_t *mixer,
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const char *lib, const char *device)
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{
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class_priv_t *priv = snd_mixer_class_get_private(class);
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snd_mixer_event_t event_func;
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snd_mixer_sfbasic_init_t init_func = NULL;
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char *xlib, *path;
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void *h;
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int err = 0;
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path = getenv("ALSA_MIXER_SIMPLE_MODULES");
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if (!path)
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path = SO_PATH;
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xlib = malloc(strlen(lib) + strlen(path) + 1 + 1);
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if (xlib == NULL)
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return -ENOMEM;
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strcpy(xlib, path);
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strcat(xlib, "/");
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strcat(xlib, lib);
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/* note python modules requires RTLD_GLOBAL */
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h = snd_dlopen(xlib, RTLD_NOW|RTLD_GLOBAL);
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if (h == NULL) {
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SNDERR("Unable to open library '%s'", xlib);
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free(xlib);
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return -ENXIO;
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}
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priv->dlhandle = h;
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event_func = snd_dlsym(h, "alsa_mixer_simple_event", NULL);
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if (event_func == NULL) {
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SNDERR("Symbol 'alsa_mixer_simple_event' was not found in '%s'", xlib);
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err = -ENXIO;
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}
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if (err == 0) {
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init_func = snd_dlsym(h, "alsa_mixer_simple_finit", NULL);
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if (init_func == NULL) {
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SNDERR("Symbol 'alsa_mixer_simple_finit' was not found in '%s'", xlib);
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err = -ENXIO;
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}
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}
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free(xlib);
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err = err == 0 ? init_func(class, mixer, device) : err;
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if (err < 0)
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return err;
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snd_mixer_class_set_event(class, event_func);
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return 1;
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}
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@ -126,6 +172,31 @@ static int match(snd_mixer_class_t *class, const char *lib, const char *searchl)
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return 0;
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}
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static int find_full(snd_mixer_class_t *class, snd_mixer_t *mixer,
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snd_config_t *top, const char *device)
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{
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snd_config_iterator_t i, next;
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char *lib;
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const char *id;
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int err;
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snd_config_for_each(i, next, top) {
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snd_config_t *n = snd_config_iterator_entry(i);
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if (snd_config_get_id(n, &id) < 0)
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continue;
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if (strcmp(id, "_full"))
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continue;
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err = snd_config_get_string(n, (const char **)&lib);
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if (err < 0)
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return err;
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err = try_open_full(class, mixer, lib, device);
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if (err < 0)
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return err;
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return 0;
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}
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return -ENOENT;
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}
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static int find_module(snd_mixer_class_t *class, snd_config_t *top)
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{
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snd_config_iterator_t i, next;
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@ -138,6 +209,8 @@ static int find_module(snd_mixer_class_t *class, snd_config_t *top)
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snd_config_t *n = snd_config_iterator_entry(i);
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if (snd_config_get_id(n, &id) < 0)
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continue;
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if (*id == '_')
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continue;
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searchl = NULL;
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lib = NULL;
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snd_config_for_each(j, jnext, n) {
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@ -223,20 +296,6 @@ int snd_mixer_simple_basic_register(snd_mixer_t *mixer,
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snd_mixer_class_set_compare(class, snd_mixer_selem_compare);
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snd_mixer_class_set_private(class, priv);
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snd_mixer_class_set_private_free(class, private_free);
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err = snd_ctl_open(&priv->ctl, priv->device, 0);
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if (err < 0) {
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SNDERR("unable to open control device '%s': %s", priv->device, snd_strerror(err));
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goto __error;
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}
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err = snd_hctl_open_ctl(&priv->hctl, priv->ctl);
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if (err < 0)
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goto __error;
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err = snd_ctl_card_info_malloc(&priv->info);
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if (err < 0)
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goto __error;
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err = snd_ctl_card_info(priv->ctl, priv->info);
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if (err < 0)
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goto __error;
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file = getenv("ALSA_MIXER_SIMPLE");
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if (!file)
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file = ALSA_CONFIG_DIR "/smixer.conf";
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@ -253,16 +312,35 @@ int snd_mixer_simple_basic_register(snd_mixer_t *mixer,
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SNDERR("%s may be old or corrupted: consider to remove or fix it", file);
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goto __error;
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}
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err = find_module(class, top);
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snd_config_delete(top);
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top = NULL;
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err = find_full(class, mixer, top, priv->device);
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if (err >= 0)
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goto __full;
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}
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if (err >= 0) {
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err = snd_ctl_open(&priv->ctl, priv->device, 0);
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if (err < 0) {
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SNDERR("unable to open control device '%s': %s", priv->device, snd_strerror(err));
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goto __error;
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}
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err = snd_hctl_open_ctl(&priv->hctl, priv->ctl);
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if (err < 0)
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goto __error;
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err = snd_ctl_card_info_malloc(&priv->info);
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if (err < 0)
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goto __error;
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err = snd_ctl_card_info(priv->ctl, priv->info);
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if (err < 0)
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goto __error;
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}
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if (err >= 0)
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err = find_module(class, top);
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if (err >= 0)
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err = snd_mixer_attach_hctl(mixer, priv->hctl);
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if (err >= 0) {
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priv->attach_flag = 1;
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err = snd_mixer_class_register(class, mixer);
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}
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__full:
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if (err < 0) {
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__error:
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if (top)
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