mirror of
https://github.com/mpv-player/mpv
synced 2024-12-15 19:35:49 +00:00
507121f7fe
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@14246 b3059339-0415-0410-9bf9-f77b7e298cf2
599 lines
16 KiB
C
599 lines
16 KiB
C
/*
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* NAS output plugin for mplayer
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*
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* based on the libaudiooss parts rewritten by me, which were
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* originally based on the NAS output plugin for xmms.
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*
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* xmms plugin by Willem Monsuwe
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* adapted for libaudiooss by Jon Trulson
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* further modified by Erik Inge Bolsø
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* largely rewritten and used for this
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* plugin by Tobias Diedrich
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*
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* Theory of operation:
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*
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* The NAS consists of two parts, a server daemon and a client.
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* We setup the server to use a buffer of size bytes_per_second
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* with a low watermark of buffer_size - NAS_FRAG_SIZE.
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* Upon starting the flow the server will generate a buffer underrun
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* event and the event handler will fill the buffer for the first time.
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* Now the server will generate a lowwater event when the server buffer
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* falls below the low watermark value. The event handler gets called
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* again and refills the buffer by the number of bytes requested by the
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* server (usually a multiple of 4096). To prevent stuttering on
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* startup (start of playing, seeks, unpausing) the client buffer should
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* be bigger than the server buffer. (For debugging we also do some
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* accounting of what we think how much of the server buffer is filled)
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <pthread.h>
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#include <audio/audiolib.h>
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#include "mp_msg.h"
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#include "audio_out.h"
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#include "audio_out_internal.h"
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#include "libaf/af_format.h"
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#define NAS_FRAG_SIZE 4096
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static char *nas_event_types[] = {
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"Undefined",
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"Undefined",
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"ElementNotify",
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"GrabNotify",
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"MonitorNotify",
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"BucketNotify",
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"DeviceNotify"
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};
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static char *nas_elementnotify_kinds[] = {
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"LowWater",
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"HighWater",
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"State",
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"Unknown"
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};
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static char *nas_states[] = {
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"Stop",
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"Start",
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"Pause",
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"Any"
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};
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static char *nas_reasons[] = {
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"User",
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"Underrun",
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"Overrun",
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"EOF",
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"Watermark",
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"Hardware",
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"Any"
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};
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static char* nas_reason(unsigned int reason)
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{
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if (reason > 6) reason = 6;
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return nas_reasons[reason];
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}
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static char* nas_elementnotify_kind(unsigned int kind)
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{
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if (kind > 2) kind = 3;
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return nas_elementnotify_kinds[kind];
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}
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static char* nas_event_type(unsigned int type) {
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if (type > 6) type = 0;
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return nas_event_types[type];
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}
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static char* nas_state(unsigned int state) {
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if (state>3) state = 3;
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return nas_states[state];
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}
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static ao_info_t info =
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{
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"NAS audio output",
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"nas",
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"Tobias Diedrich",
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""
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};
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struct ao_nas_data {
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AuServer *aud;
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AuFlowID flow;
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AuDeviceID dev;
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AuFixedPoint gain;
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unsigned int state;
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int expect_underrun;
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void *client_buffer;
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void *server_buffer;
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int client_buffer_size;
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int client_buffer_used;
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int server_buffer_size;
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int server_buffer_used;
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pthread_mutex_t buffer_mutex;
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pthread_t event_thread;
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int stop_thread;
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};
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static struct ao_nas_data *nas_data;
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LIBAO_EXTERN(nas)
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static void nas_print_error(AuServer *aud, char *prefix, AuStatus as)
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{
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char s[100];
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AuGetErrorText(aud, as, s, 100);
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mp_msg(MSGT_AO, MSGL_ERR, "ao_nas: %s: returned status %d (%s)\n", prefix, as, s);
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}
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static int nas_readBuffer(struct ao_nas_data *nas_data, int num)
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{
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AuStatus as;
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pthread_mutex_lock(&nas_data->buffer_mutex);
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mp_msg(MSGT_AO, MSGL_DBG2, "ao_nas: nas_readBuffer(): num=%d client=%d/%d server=%d/%d\n",
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num,
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nas_data->client_buffer_used, nas_data->client_buffer_size,
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nas_data->server_buffer_used, nas_data->server_buffer_size);
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if (nas_data->client_buffer_used == 0) {
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mp_msg(MSGT_AO, MSGL_DBG2, "ao_nas: buffer is empty, nothing read.\n");
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pthread_mutex_unlock(&nas_data->buffer_mutex);
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return 0;
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}
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if (nas_data->client_buffer_used < num)
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num = nas_data->client_buffer_used;
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/*
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* It is not appropriate to call AuWriteElement() here because the
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* buffer is locked and delays writing to the network will cause
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* other threads to block waiting for buffer_mutex. Instead the
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* data is copied to "server_buffer" and written it to the network
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* outside of the locked section of code.
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*
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* (Note: Rather than these two buffers, a single circular buffer
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* could eliminate the memcpy/memmove steps.)
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*/
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memcpy(nas_data->server_buffer, nas_data->client_buffer, num);
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nas_data->client_buffer_used -= num;
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nas_data->server_buffer_used += num;
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memmove(nas_data->client_buffer, nas_data->client_buffer + num, nas_data->client_buffer_used);
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pthread_mutex_unlock(&nas_data->buffer_mutex);
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/*
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* Now write the new buffer to the network.
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*/
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AuWriteElement(nas_data->aud, nas_data->flow, 0, num, nas_data->server_buffer, AuFalse, &as);
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if (as != AuSuccess)
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nas_print_error(nas_data->aud, "nas_readBuffer(): AuWriteElement", as);
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return num;
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}
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static void nas_writeBuffer(struct ao_nas_data *nas_data, void *data, int len)
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{
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pthread_mutex_lock(&nas_data->buffer_mutex);
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mp_msg(MSGT_AO, MSGL_DBG2, "ao_nas: nas_writeBuffer(): len=%d client=%d/%d server=%d/%d\n",
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len, nas_data->client_buffer_used, nas_data->client_buffer_size,
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nas_data->server_buffer_used, nas_data->server_buffer_size);
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memcpy(nas_data->client_buffer + nas_data->client_buffer_used, data, len);
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nas_data->client_buffer_used += len;
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pthread_mutex_unlock(&nas_data->buffer_mutex);
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}
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static int nas_empty_event_queue(struct ao_nas_data *nas_data)
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{
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AuEvent ev;
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int result = 0;
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while (AuScanForTypedEvent(nas_data->aud, AuEventsQueuedAfterFlush,
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AuTrue, AuEventTypeElementNotify, &ev)) {
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AuDispatchEvent(nas_data->aud, &ev);
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result = 1;
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}
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return result;
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}
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static void *nas_event_thread_start(void *data)
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{
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struct ao_nas_data *nas_data = data;
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do {
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mp_msg(MSGT_AO, MSGL_DBG2,
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"ao_nas: event thread heartbeat (state=%s)\n",
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nas_state(nas_data->state));
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nas_empty_event_queue(nas_data);
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usleep(1000);
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} while (!nas_data->stop_thread);
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return NULL;
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}
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static AuBool nas_error_handler(AuServer* aud, AuErrorEvent* ev)
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{
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char s[100];
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AuGetErrorText(aud, ev->error_code, s, 100);
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mp_msg(MSGT_AO, MSGL_ERR, "ao_nas: error [%s]\n"
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"error_code: %d\n"
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"request_code: %d\n"
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"minor_code: %d\n",
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s,
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ev->error_code,
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ev->request_code,
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ev->minor_code);
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return AuTrue;
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}
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static AuBool nas_event_handler(AuServer *aud, AuEvent *ev, AuEventHandlerRec *hnd)
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{
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AuElementNotifyEvent *event = (AuElementNotifyEvent *) ev;
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struct ao_nas_data *nas_data = hnd->data;
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mp_msg(MSGT_AO, MSGL_DBG2, "ao_nas: event_handler(): type %s kind %s state %s->%s reason %s numbytes %d expect_underrun %d\n",
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nas_event_type(event->type),
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nas_elementnotify_kind(event->kind),
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nas_state(event->prev_state),
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nas_state(event->cur_state),
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nas_reason(event->reason),
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event->num_bytes,
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nas_data->expect_underrun);
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nas_data->server_buffer_used -= event->num_bytes;
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if (nas_data->server_buffer_used < 0)
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nas_data->server_buffer_used = 0;
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switch (event->reason) {
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case AuReasonWatermark:
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nas_readBuffer(nas_data, event->num_bytes);
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break;
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case AuReasonUnderrun:
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// buffer underrun -> refill buffer
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nas_data->server_buffer_used = 0;
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if (nas_data->expect_underrun) {
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nas_data->expect_underrun = 0;
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} else {
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static int hint = 1;
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mp_msg(MSGT_AO, MSGL_WARN,
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"ao_nas: Buffer underrun.\n");
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if (hint) {
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hint = 0;
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mp_msg(MSGT_AO, MSGL_HINT,
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"Possible reasons are:\n"
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"1) Network congestion.\n"
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"2) Your NAS server is too slow.\n"
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"Try renicing your nasd to e.g. -15.\n");
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}
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}
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if (nas_readBuffer(nas_data,
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nas_data->server_buffer_size -
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nas_data->server_buffer_used) != 0) {
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event->cur_state = AuStateStart;
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break;
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}
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mp_msg(MSGT_AO, MSGL_DBG2,
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"ao_nas: Can't refill buffer, stopping flow.\n");
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AuStopFlow(nas_data->aud, nas_data->flow, NULL);
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break;
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default:
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break;
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}
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nas_data->state=event->cur_state;
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return AuTrue;
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}
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static AuDeviceID nas_find_device(AuServer *aud, int nch)
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{
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int i;
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for (i = 0; i < AuServerNumDevices(aud); i++) {
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AuDeviceAttributes *dev = AuServerDevice(aud, i);
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if ((AuDeviceKind(dev) == AuComponentKindPhysicalOutput) &&
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AuDeviceNumTracks(dev) == nch) {
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return AuDeviceIdentifier(dev);
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}
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}
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return AuNone;
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}
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static unsigned int nas_aformat_to_auformat(unsigned int *format)
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{
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switch (*format) {
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case AF_FORMAT_U8:
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return AuFormatLinearUnsigned8;
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case AF_FORMAT_S8:
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return AuFormatLinearSigned8;
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case AF_FORMAT_U16_LE:
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return AuFormatLinearUnsigned16LSB;
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case AF_FORMAT_U16_BE:
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return AuFormatLinearUnsigned16MSB;
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case AF_FORMAT_S16_LE:
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return AuFormatLinearSigned16LSB;
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case AF_FORMAT_S16_BE:
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return AuFormatLinearSigned16MSB;
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case AF_FORMAT_MU_LAW:
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return AuFormatULAW8;
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default:
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*format=AF_FORMAT_S16_NE;
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return nas_aformat_to_auformat(format);
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}
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}
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// to set/get/query special features/parameters
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static int control(int cmd, void *arg)
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{
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AuElementParameters aep;
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AuStatus as;
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int retval = CONTROL_UNKNOWN;
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ao_control_vol_t *vol = (ao_control_vol_t *)arg;
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switch (cmd) {
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case AOCONTROL_GET_VOLUME:
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vol->right = (float)nas_data->gain/AU_FIXED_POINT_SCALE*50;
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vol->left = vol->right;
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mp_msg(MSGT_AO, MSGL_DBG2, "ao_nas: AOCONTROL_GET_VOLUME: %08x\n", nas_data->gain);
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retval = CONTROL_OK;
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break;
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case AOCONTROL_SET_VOLUME:
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/*
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* kn: we should have vol->left == vol->right but i don't
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* know if something can change it outside of ao_nas
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* so i take the mean of both values.
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*/
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nas_data->gain = AU_FIXED_POINT_SCALE*((vol->left+vol->right)/2)/50;
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mp_msg(MSGT_AO, MSGL_DBG2, "ao_nas: AOCONTROL_SET_VOLUME: %08x\n", nas_data->gain);
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aep.parameters[AuParmsMultiplyConstantConstant]=nas_data->gain;
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aep.flow = nas_data->flow;
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aep.element_num = 1;
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aep.num_parameters = AuParmsMultiplyConstant;
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AuSetElementParameters(nas_data->aud, 1, &aep, &as);
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if (as != AuSuccess) {
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nas_print_error(nas_data->aud,
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"control(): AuSetElementParameters", as);
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retval = CONTROL_ERROR;
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} else retval = CONTROL_OK;
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break;
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};
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return retval;
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}
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// open & setup audio device
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// return: 1=success 0=fail
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static int init(int rate,int channels,int format,int flags)
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{
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AuElement elms[3];
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AuStatus as;
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unsigned char auformat = nas_aformat_to_auformat(&format);
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int bytes_per_sample = channels * AuSizeofFormat(auformat);
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int buffer_size;
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char *server;
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nas_data=malloc(sizeof(struct ao_nas_data));
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memset(nas_data, 0, sizeof(struct ao_nas_data));
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mp_msg(MSGT_AO, MSGL_V, "ao2: %d Hz %d chans %s\n",rate,channels,
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audio_out_format_name(format));
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ao_data.format = format;
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ao_data.samplerate = rate;
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ao_data.channels = channels;
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ao_data.outburst = NAS_FRAG_SIZE;
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ao_data.bps = rate * bytes_per_sample;
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buffer_size = ao_data.bps; /* buffer 1 second */
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/*
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* round up to multiple of NAS_FRAG_SIZE
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* divide by 3 first because of 2:1 split
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*/
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buffer_size = (buffer_size/3 + NAS_FRAG_SIZE-1) & ~(NAS_FRAG_SIZE-1);
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ao_data.buffersize = buffer_size*3;
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nas_data->client_buffer_size = buffer_size*2;
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nas_data->client_buffer = malloc(nas_data->client_buffer_size);
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nas_data->server_buffer_size = buffer_size;
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nas_data->server_buffer = malloc(nas_data->server_buffer_size);
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if (!bytes_per_sample) {
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mp_msg(MSGT_AO, MSGL_ERR, "ao_nas: init(): Zero bytes per sample -> nosound\n");
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return 0;
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}
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if (!(server = getenv("AUDIOSERVER")) &&
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!(server = getenv("DISPLAY"))) {
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mp_msg(MSGT_AO, MSGL_ERR, "ao_nas: init(): AUDIOSERVER environment variable not set -> nosound\n");
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return 0;
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}
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mp_msg(MSGT_AO, MSGL_V, "ao_nas: init(): Using audioserver %s\n", server);
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nas_data->aud = AuOpenServer(server, 0, NULL, 0, NULL, NULL);
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if (!nas_data->aud) {
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mp_msg(MSGT_AO, MSGL_ERR, "ao_nas: init(): Can't open nas audio server -> nosound\n");
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return 0;
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}
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while (channels>1) {
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nas_data->dev = nas_find_device(nas_data->aud, channels);
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if (nas_data->dev != AuNone &&
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((nas_data->flow = AuCreateFlow(nas_data->aud, NULL)) != 0))
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break;
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channels--;
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}
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if (nas_data->flow == 0) {
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mp_msg(MSGT_AO, MSGL_ERR, "ao_nas: init(): Can't find a suitable output device -> nosound\n");
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AuCloseServer(nas_data->aud);
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nas_data->aud = 0;
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return 0;
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}
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AuMakeElementImportClient(elms, rate, auformat, channels, AuTrue,
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buffer_size / bytes_per_sample,
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(buffer_size - NAS_FRAG_SIZE) /
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bytes_per_sample, 0, NULL);
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nas_data->gain = AuFixedPointFromFraction(1, 1);
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AuMakeElementMultiplyConstant(elms+1, 0, nas_data->gain);
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AuMakeElementExportDevice(elms+2, 1, nas_data->dev, rate,
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AuUnlimitedSamples, 0, NULL);
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AuSetElements(nas_data->aud, nas_data->flow, AuTrue, sizeof(elms)/sizeof(*elms), elms, &as);
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if (as != AuSuccess) {
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nas_print_error(nas_data->aud, "init(): AuSetElements", as);
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AuCloseServer(nas_data->aud);
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nas_data->aud = 0;
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return 0;
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}
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AuRegisterEventHandler(nas_data->aud, AuEventHandlerIDMask |
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AuEventHandlerTypeMask,
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AuEventTypeElementNotify, nas_data->flow,
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nas_event_handler, (AuPointer) nas_data);
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AuSetErrorHandler(nas_data->aud, nas_error_handler);
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nas_data->state=AuStateStop;
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nas_data->expect_underrun=0;
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pthread_mutex_init(&nas_data->buffer_mutex, NULL);
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pthread_create(&nas_data->event_thread, NULL, &nas_event_thread_start, nas_data);
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return 1;
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}
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// close audio device
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static void uninit(int immed){
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mp_msg(MSGT_AO, MSGL_DBG3, "ao_nas: uninit()\n");
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nas_data->expect_underrun = 1;
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while (nas_data->state != AuStateStop) usleep(1000);
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nas_data->stop_thread = 1;
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pthread_join(nas_data->event_thread, NULL);
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AuCloseServer(nas_data->aud);
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nas_data->aud = 0;
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free(nas_data->client_buffer);
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free(nas_data->server_buffer);
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}
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// stop playing and empty buffers (for seeking/pause)
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static void reset(){
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AuStatus as;
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mp_msg(MSGT_AO, MSGL_DBG3, "ao_nas: reset()\n");
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pthread_mutex_lock(&nas_data->buffer_mutex);
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nas_data->client_buffer_used = 0;
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pthread_mutex_unlock(&nas_data->buffer_mutex);
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while (nas_data->state != AuStateStop) {
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AuStopFlow(nas_data->aud, nas_data->flow, &as);
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if (as != AuSuccess)
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nas_print_error(nas_data->aud, "reset(): AuStopFlow", as);
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usleep(1000);
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}
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}
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// stop playing, keep buffers (for pause)
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static void audio_pause()
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{
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AuStatus as;
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mp_msg(MSGT_AO, MSGL_DBG3, "ao_nas: audio_pause()\n");
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|
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AuStopFlow(nas_data->aud, nas_data->flow, &as);
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}
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// resume playing, after audio_pause()
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static void audio_resume()
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{
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AuStatus as;
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|
|
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mp_msg(MSGT_AO, MSGL_DBG3, "ao_nas: audio_resume()\n");
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|
|
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AuStartFlow(nas_data->aud, nas_data->flow, &as);
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if (as != AuSuccess)
|
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nas_print_error(nas_data->aud,
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"play(): AuStartFlow", as);
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}
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|
|
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// return: how many bytes can be played without blocking
|
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static int get_space()
|
|
{
|
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int result;
|
|
|
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mp_msg(MSGT_AO, MSGL_DBG3, "ao_nas: get_space()\n");
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|
|
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pthread_mutex_lock(&nas_data->buffer_mutex);
|
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result = nas_data->client_buffer_size - nas_data->client_buffer_used;
|
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pthread_mutex_unlock(&nas_data->buffer_mutex);
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|
|
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return result;
|
|
}
|
|
|
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// plays 'len' bytes of 'data'
|
|
// it should round it down to outburst*n
|
|
// return: number of bytes played
|
|
static int play(void* data,int len,int flags)
|
|
{
|
|
int maxbursts, playbursts, writelen;
|
|
AuStatus as;
|
|
|
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mp_msg(MSGT_AO, MSGL_DBG3,
|
|
"ao_nas: play(%p, %d, %d)\n",
|
|
data, len, flags);
|
|
|
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if (len == 0)
|
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return 0;
|
|
|
|
pthread_mutex_lock(&nas_data->buffer_mutex);
|
|
maxbursts = (nas_data->client_buffer_size -
|
|
nas_data->client_buffer_used) / ao_data.outburst;
|
|
playbursts = len / ao_data.outburst;
|
|
writelen = (playbursts > maxbursts ? maxbursts : playbursts) *
|
|
ao_data.outburst;
|
|
pthread_mutex_unlock(&nas_data->buffer_mutex);
|
|
|
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nas_writeBuffer(nas_data, data, writelen);
|
|
|
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if (nas_data->state != AuStateStart &&
|
|
maxbursts == playbursts) {
|
|
mp_msg(MSGT_AO, MSGL_DBG2, "ao_nas: play(): Starting flow.\n");
|
|
nas_data->expect_underrun = 1;
|
|
AuStartFlow(nas_data->aud, nas_data->flow, &as);
|
|
if (as != AuSuccess)
|
|
nas_print_error(nas_data->aud, "play(): AuStartFlow", as);
|
|
}
|
|
|
|
return writelen;
|
|
}
|
|
|
|
// return: delay in seconds between first and last sample in buffer
|
|
static float get_delay()
|
|
{
|
|
float result;
|
|
|
|
mp_msg(MSGT_AO, MSGL_DBG3, "ao_nas: get_delay()\n");
|
|
|
|
pthread_mutex_lock(&nas_data->buffer_mutex);
|
|
result = ((float)(nas_data->client_buffer_used +
|
|
nas_data->server_buffer_used)) /
|
|
(float)ao_data.bps;
|
|
pthread_mutex_unlock(&nas_data->buffer_mutex);
|
|
|
|
return result;
|
|
}
|