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alsa: Manage device index, not just card ID.

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Otherwise multiple devices on one card won't open correctly.

Fixes #16205.
This commit is contained in:
Ryan C. Gordon
2026-08-27 14:23:09 -04:00
parent 774a3a0ab1
commit af9dbb65f6
1 changed files with 9 additions and 9 deletions
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18
src/audio/alsa/SDL_alsa_audio.c
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@@ -303,8 +303,9 @@ static void ALSA_guess_device_prefix(void)
typedef struct ALSA_Device
{
// the unicity key is the couple (id,recording)
// the unicity key is the triple (id,device_index,recording)
char *id; // empty means canonical default
int device_index;
char *name;
bool recording;
struct ALSA_Device *next;
@@ -312,6 +313,7 @@ typedef struct ALSA_Device
static const ALSA_Device default_playback_handle = {
"",
0,
"default",
false,
NULL
@@ -319,6 +321,7 @@ static const ALSA_Device default_playback_handle = {
static const ALSA_Device default_recording_handle = {
"",
0,
"default",
true,
NULL
@@ -349,7 +352,7 @@ static char *get_pcm_str(void *handle)
}
pcm_str = SDL_strdup(devname);
} else {
SDL_asprintf(&pcm_str, "%sCARD=%s", ALSA_device_prefix, dev->id);
SDL_asprintf(&pcm_str, "%sCARD=%s,DEV=%d", ALSA_device_prefix, dev->id, dev->device_index);
}
return pcm_str;
}
@@ -1263,8 +1266,8 @@ static int hotplug_device_process(snd_ctl_t *ctl, snd_ctl_card_info_t *ctl_card_
ALSA_Device *unseen_prev_adev = NULL;
ALSA_Device *adev;
for (adev = *unseen; adev; adev = adev->next) {
// the unicity key is the couple (id,recording)
if ((SDL_strcmp(adev->id, ALSA_snd_ctl_card_info_get_id(ctl_card_info)) == 0) && (adev->recording == recording)) {
// the unicity key is the triple (id,device_index,recording)
if ((SDL_strcmp(adev->id, ALSA_snd_ctl_card_info_get_id(ctl_card_info)) == 0) && (adev->device_index == dev_idx) && (adev->recording == recording)) {
// unchain from unseen
if (*unseen == adev) { // head
*unseen = adev->next;
@@ -1300,11 +1303,8 @@ static int hotplug_device_process(snd_ctl_t *ctl, snd_ctl_card_info_t *ctl_card_
return -1;
}
if (direction == SND_PCM_STREAM_CAPTURE) {
adev->recording = true;
} else {
adev->recording = false;
}
adev->device_index = dev_idx;
adev->recording = (direction == SND_PCM_STREAM_CAPTURE);
if (SDL_AddAudioDevice(recording, adev->name, NULL, adev) == NULL) {
SDL_small_free(pcm_info, isstack);