mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-10-29 05:40:25 -04:00
88e5e45151
The sequencer API is totally recoded with the style of "encapsulation" in other api. The structure becomes opaque and accessed only via functions. Other changes: - There is no longer group in client and port info. - snd_seq_query_subs_t is renamed to snd_seq_query_subscribe_t. - snd_seq_delete_port takes only the port id argument instead of port_info structure. - snd_seq_input/output_buffer_size are renamed as snd_seq_get_input/output_buffer_size. Similarly snd_seq_resize_input/output_buffer are renamed as snd_seq_set_input/output_buffer_size. - snd_seq_get_named_queue is renamed to snd_seq_query_named_queue. - Sync codes are removed temporarily from API. - Subscription conditions are accessed via the corresponding functions. convert_time is named now as time_update. - snd_seq_get/set_queue_owner are removed. Use snd_seq_get/set_queue_info instead. - Instrument put/get/remove structure is unified as snd_instr_header_t.
269 lines
7.3 KiB
C
269 lines
7.3 KiB
C
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#ifdef USE_PCM // XXX not yet
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/*
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* PCM timer layer
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*/
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int pcard = 0;
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int pdevice = 0;
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int period_size = 1024;
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void set_hwparams(snd_pcm_t *phandle)
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{
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int err;
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snd_pcm_hw_params_t *params;
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err = snd_output_stdio_attach(&log, stderr, 0);
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if (err < 0) {
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fprintf(stderr, "cannot attach output stdio\n");
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exit(0);
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}
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snd_pcm_hw_params_alloca(¶ms);
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err = snd_pcm_hw_params_any(phandle, params);
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if (err < 0) {
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fprintf(stderr, "Broken configuration for this PCM: no configurations available\n");
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exit(0);
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}
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err = snd_pcm_hw_params_set_access(phandle, params,
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SND_PCM_ACCESS_RW_INTERLEAVED);
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if (err < 0) {
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fprintf(stderr, "Access type not available\n");
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exit(0);
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}
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err = snd_pcm_hw_params_set_format(phandle, params, SND_PCM_FORMAT_S16_LE);
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if (err < 0) {
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fprintf(stderr, "cannot set format\n");
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exit(0);
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}
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err = snd_pcm_hw_params_set_channels(phandle, params, 2);
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if (err < 0) {
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fprintf(stderr, "cannot set channels 2\n");
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exit(0);
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}
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err = snd_pcm_hw_params_set_rate_near(phandle, params, 44100, 0);
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if (err < 0) {
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fprintf(stderr, "cannot set rate\n");
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exit(0);
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}
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err = snd_pcm_hw_params_set_period_size_near(phandle, params, period_size);
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if (err < 0) {
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fprintf(stderr, "cannot set period size\n");
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exit(0);
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}
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err = snd_pcm_hw_params(phandle, params);
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if (err < 0) {
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fprintf(stderr, "Unable to install hw params:\n");
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exit(0);
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}
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snd_pcm_hw_params_dump(params, log);
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}
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#endif
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/*
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* Simple event sender
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*/
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void event_sender_start_timer(snd_seq_t *handle, int client, int queue, snd_pcm_t *phandle)
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{
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int err;
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#ifdef USE_PCM
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if (phandle) {
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snd_pcm_playback_info_t pinfo;
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snd_seq_queue_timer_t qtimer;
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if ((err = snd_pcm_playback_info(phandle, &pinfo)) < 0) {
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fprintf(stderr, "Playback info error: %s\n", snd_strerror(err));
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exit(0);
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}
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bzero(&qtimer, sizeof(qtimer));
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qtimer.type = SND_SEQ_TIMER_MASTER;
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/* note: last bit from subdevices specifies playback */
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/* or capture direction for the timer specification */
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qtimer.number = SND_TIMER_PCM(pcard, pdevice, pinfo.subdevice << 1);
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if ((err = snd_seq_set_queue_timer(handle, queue, &qtimer)) < 0) {
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fprintf(stderr, "Sequencer PCM timer setup failed: %s\n", snd_strerror(err));
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exit(0);
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}
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}
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#endif
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if ((err = snd_seq_start_queue(handle, queue, NULL))<0)
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fprintf(stderr, "Timer event output error: %s\n", snd_strerror(err));
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snd_seq_drain_output(handle);
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}
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void event_sender_filter(snd_seq_t *handle)
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{
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int err;
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if ((err = snd_seq_set_client_event_filter(handle, SND_SEQ_EVENT_ECHO)) < 0) {
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fprintf(stderr, "Unable to set client info: %s\n", snd_strerror(err));
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return;
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}
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}
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void send_event(snd_seq_t *handle, int queue, int client, int port,
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snd_seq_addr_t *dest, int *time)
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{
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int err;
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snd_seq_event_t ev;
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bzero(&ev, sizeof(ev));
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ev.queue = queue;
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ev.source.client = ev.dest.client = client;
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ev.source.port = ev.dest.port = port;
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ev.flags = SND_SEQ_TIME_STAMP_REAL | SND_SEQ_TIME_MODE_ABS;
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ev.time.time.tv_sec = *time; (*time)++;
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ev.type = SND_SEQ_EVENT_ECHO;
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if ((err = snd_seq_event_output(handle, &ev))<0)
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fprintf(stderr, "Event output error: %s\n", snd_strerror(err));
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ev.dest = *dest;
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ev.type = SND_SEQ_EVENT_PGMCHANGE;
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ev.data.control.channel = 0;
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ev.data.control.value = 16;
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if ((err = snd_seq_event_output(handle, &ev))<0)
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fprintf(stderr, "Event output error: %s\n", snd_strerror(err));
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ev.type = SND_SEQ_EVENT_NOTE;
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ev.data.note.channel = 0;
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ev.data.note.note = 64 + (queue*2);
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ev.data.note.velocity = 127;
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ev.data.note.off_velocity = 127;
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ev.data.note.duration = 500; /* 0.5sec */
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if ((err = snd_seq_event_output(handle, &ev))<0)
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fprintf(stderr, "Event output error: %s\n", snd_strerror(err));
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if ((err = snd_seq_drain_output(handle))<0)
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fprintf(stderr, "Event drain error: %s\n", snd_strerror(err));
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}
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void event_sender(snd_seq_t *handle, int argc, char *argv[])
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{
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snd_seq_event_t *ev;
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snd_seq_port_info_t *pinfo;
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snd_seq_port_subscribe_t *sub;
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snd_seq_addr_t addr;
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struct pollfd *pfds;
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int client, port, queue, max, err, v1, v2, time = 0, pcm_flag = 0;
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char *ptr;
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snd_pcm_t *phandle = NULL;
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if (argc < 1) {
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fprintf(stderr, "Invalid destination...\n");
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return;
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}
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if ((client = snd_seq_client_id(handle))<0) {
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fprintf(stderr, "Cannot determine client number: %s\n", snd_strerror(client));
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return;
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}
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printf("Client ID = %i\n", client);
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if ((queue = snd_seq_alloc_queue(handle))<0) {
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fprintf(stderr, "Cannot allocate queue: %s\n", snd_strerror(queue));
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return;
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}
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printf("Queue ID = %i\n", queue);
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event_sender_filter(handle);
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if ((err = snd_seq_nonblock(handle, 1))<0)
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fprintf(stderr, "Cannot set nonblock mode: %s\n", snd_strerror(err));
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snd_seq_port_info_alloca(&pinfo);
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snd_seq_port_info_set_capability(pinfo, SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_READ);
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snd_seq_port_info_set_name(pinfo, "Output");
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if ((err = snd_seq_create_port(handle, pinfo)) < 0) {
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fprintf(stderr, "Cannot create output port: %s\n", snd_strerror(err));
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return;
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}
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port = snd_seq_port_info_get_port(pinfo);
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snd_seq_port_subscribe_alloca(&sub);
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addr.client = client;
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addr.port = port;
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snd_seq_port_subscribe_set_sender(sub, &addr);
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for (max = 0; max < argc; max++) {
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ptr = argv[max];
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if (!ptr)
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continue;
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if (!strcmp(ptr, "pcm")) {
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pcm_flag = 1;
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continue;
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}
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if (sscanf(ptr, "%i.%i", &v1, &v2) != 2) {
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fprintf(stderr, "Wrong argument '%s'...\n", argv[max]);
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return;
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}
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addr.client = v1;
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addr.port = v2;
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snd_seq_port_subscribe_set_dest(sub, &addr);
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if ((err = snd_seq_subscribe_port(handle, sub))<0) {
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fprintf(stderr, "Cannot subscribe port %i from client %i: %s\n", v2, v1, snd_strerror(err));
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return;
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}
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}
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printf("Destination client = %i, port = %i\n", addr.client, addr.port);
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#ifdef USE_PCM
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if (pcm_flag) {
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if ((err = snd_pcm_open(&phandle, "default", SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
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fprintf(stderr, "Playback open error: %s\n", snd_strerror(err));
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exit(0);
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}
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set_hwparams(phandle);
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pbuf = calloc(1, period_size * 4);
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if (pbuf == NULL) {
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fprintf(stderr, "No enough memory...\n");
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exit(0);
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}
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}
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#endif
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event_sender_start_timer(handle, client, queue, phandle);
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/* send the first event */
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send_event(handle, queue, client, port, &addr, &time);
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#ifdef USE_PCM
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if (phandle)
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max += snd_pcm_poll_descriptors_count(phandle);
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#endif
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pfds = alloca(sizeof(*pfds) * max);
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while (1) {
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int nseqs = snd_seq_poll_descriptors_count(handle, POLLOUT|POLLIN);
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if (snd_seq_event_output_pending(handle))
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snd_seq_poll_descriptors(handle, pfds, nseqs, POLLOUT|POLLIN);
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else
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snd_seq_poll_descriptors(handle, pfds, nseqs, POLLIN);
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max = nseqs;
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#ifdef USE_PCM
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if (phandle) {
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int pmax = snd_pcm_poll_descriptors_count(phandle);
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snd_seq_poll_descriptors(phandle, pfds + max, pmax);
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max += pmax;
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}
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#endif
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if (poll(pfds, max, -1) < 0)
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break;
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#ifdef USE_PCM
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if (phandle && (pfds[nseqs].revents & POLLOUT)) {
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if (snd_pcm_writei(phandle, pbuf, period_size) != period_size) {
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fprintf(stderr, "Playback write error!!\n");
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exit(0);
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}
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}
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#endif
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if (pfds[0].revents & POLLOUT)
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snd_seq_drain_output(handle);
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if (pfds[0].revents & POLLIN) {
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do {
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if ((err = snd_seq_event_input(handle, &ev))<0)
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break;
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if (!ev)
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continue;
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if (ev->type == SND_SEQ_EVENT_ECHO)
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send_event(handle, queue, client, port, &addr, &time);
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decode_event(ev);
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snd_seq_free_event(ev);
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} while (err > 0);
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}
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}
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}
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