mirror of
https://github.com/mpv-player/mpv
synced 2024-12-25 16:33:02 +00:00
45defa1aa0
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@22160 b3059339-0415-0410-9bf9-f77b7e298cf2
325 lines
8.9 KiB
C
325 lines
8.9 KiB
C
#include <assert.h>
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#include <string.h>
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#include <polyp/polyplib.h>
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#include <polyp/polyplib-error.h>
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#include <polyp/mainloop.h>
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#include "config.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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#include "mp_msg.h"
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#define POLYP_CLIENT_NAME "MPlayer"
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/** General driver info */
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static ao_info_t info = {
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"Polypaudio audio output",
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"polyp",
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"Lennart Poettering",
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""
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};
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/** The sink to connect to */
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static char *sink = NULL;
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/** Polypaudio playback stream object */
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static struct pa_stream *stream = NULL;
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/** Polypaudio connection context */
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static struct pa_context *context = NULL;
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/** Main event loop object */
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static struct pa_mainloop *mainloop = NULL;
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/** Some special libao macro magic */
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LIBAO_EXTERN(polyp)
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/** Wait until no further actions are pending on the connection context */
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static void wait_for_completion(void) {
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assert(context && mainloop);
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while (pa_context_is_pending(context))
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pa_mainloop_iterate(mainloop, 1, NULL);
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}
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/** Make sure that the connection context doesn't starve to death */
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static void keep_alive(void) {
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assert(context && mainloop);
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while (pa_mainloop_iterate(mainloop, 0, NULL) > 0);
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}
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/** Wait until the specified operation completes */
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static void wait_for_operation(struct pa_operation *o) {
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assert(o && context && mainloop);
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while (pa_operation_get_state(o) == PA_OPERATION_RUNNING)
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pa_mainloop_iterate(mainloop, 1, NULL);
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pa_operation_unref(o);
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}
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/** libao initialization function, arguments are sampling frequency,
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* number of channels, sample type and some flags */
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static int init(int rate_hz, int channels, int format, int flags) {
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struct pa_sample_spec ss;
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struct pa_buffer_attr a;
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char hn[128];
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char *host = NULL;
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assert(!context && !stream && !mainloop);
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if (ao_subdevice) {
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int i = strcspn(ao_subdevice, ":");
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if (i >= sizeof(hn))
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i = sizeof(hn)-1;
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if (i > 0) {
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strncpy(host = hn, ao_subdevice, i);
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hn[i] = 0;
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}
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if (ao_subdevice[i] == ':')
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sink = ao_subdevice+i+1;
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}
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mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] -%s-%s-\n", host, sink);
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ss.channels = channels;
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ss.rate = rate_hz;
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switch (format) {
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case AF_FORMAT_U8:
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ss.format = PA_SAMPLE_U8;
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break;
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case AF_FORMAT_S16_LE:
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ss.format = PA_SAMPLE_S16LE;
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break;
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case AF_FORMAT_S16_BE:
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ss.format = PA_SAMPLE_S16BE;
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break;
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case AF_FORMAT_FLOAT_NE:
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ss.format = PA_SAMPLE_FLOAT32;
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break;
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default:
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mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] Unsupported sample spec\n");
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goto fail;
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}
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if (!pa_sample_spec_valid(&ss)) {
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mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] Invalid sample spec\n");
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goto fail;
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}
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mainloop = pa_mainloop_new();
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assert(mainloop);
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context = pa_context_new(pa_mainloop_get_api(mainloop), POLYP_CLIENT_NAME);
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assert(context);
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pa_context_connect(context, host, 1, NULL);
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wait_for_completion();
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if (pa_context_get_state(context) != PA_CONTEXT_READY) {
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mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] Failed to connect to server: %s\n", pa_strerror(pa_context_errno(context)));
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goto fail;
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}
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stream = pa_stream_new(context, "audio stream", &ss);
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assert(stream);
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a.maxlength = pa_bytes_per_second(&ss)*1;
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a.tlength = a.maxlength*9/10;
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a.prebuf = a.tlength/2;
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a.minreq = a.tlength/10;
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pa_stream_connect_playback(stream, sink, &a, PA_STREAM_INTERPOLATE_LATENCY, PA_VOLUME_NORM);
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wait_for_completion();
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if (pa_stream_get_state(stream) != PA_STREAM_READY) {
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mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] Failed to connect to server: %s\n", pa_strerror(pa_context_errno(context)));
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goto fail;
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}
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return 1;
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fail:
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uninit(1);
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return 0;
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}
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/** Destroy libao driver */
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static void uninit(int immed) {
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if (stream) {
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if (!immed && pa_stream_get_state(stream) == PA_STREAM_READY)
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wait_for_operation(pa_stream_drain(stream, NULL, NULL));
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pa_stream_unref(stream);
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stream = NULL;
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}
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if (context) {
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pa_context_unref(context);
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context = NULL;
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}
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if (mainloop) {
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pa_mainloop_free(mainloop);
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mainloop = NULL;
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}
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}
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/** Play the specified data to the polypaudio server */
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static int play(void* data, int len, int flags) {
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assert(stream && context);
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if (pa_stream_get_state(stream) != PA_STREAM_READY)
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return -1;
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if (!len)
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wait_for_operation(pa_stream_trigger(stream, NULL, NULL));
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else
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pa_stream_write(stream, data, len, NULL, 0);
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wait_for_completion();
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if (pa_stream_get_state(stream) != PA_STREAM_READY)
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return -1;
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return len;
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}
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/** Pause the audio stream by corking it on the server */
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static void audio_pause(void) {
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assert(stream && context && pa_stream_get_state(stream) == PA_STREAM_READY);
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wait_for_operation(pa_stream_cork(stream, 1, NULL, NULL));
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}
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/** Resume the audio stream by uncorking it on the server */
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static void audio_resume(void) {
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assert(stream && context && pa_stream_get_state(stream) == PA_STREAM_READY);
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wait_for_operation(pa_stream_cork(stream, 0, NULL, NULL));
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}
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/** Reset the audio stream, i.e. flush the playback buffer on the server side */
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static void reset(void) {
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assert(stream && context && pa_stream_get_state(stream) == PA_STREAM_READY);
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wait_for_operation(pa_stream_flush(stream, NULL, NULL));
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}
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/** Return number of bytes that may be written to the server without blocking */
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static int get_space(void) {
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uint32_t l;
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assert(stream && context && pa_stream_get_state(stream) == PA_STREAM_READY);
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keep_alive();
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l = pa_stream_writable_size(stream);
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return l;
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}
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/* A temporary latency variable */
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/* static pa_usec_t latency = 0; */
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/* static void latency_func(struct pa_stream *s, const struct pa_latency_info *l, void *userdata) { */
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/* int negative = 0; */
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/* if (!l) { */
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/* mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] Invalid sample spec: %s\n", pa_strerror(pa_context_errno(context))); */
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/* return; */
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/* } */
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/* latency = pa_stream_get_latency(s, l, &negative); */
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/* /\* Nor really required *\/ */
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/* if (negative) */
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/* latency = 0; */
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/* } */
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/** Return the current latency in seconds */
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static float get_delay(void) {
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pa_usec_t latency;
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assert(stream && context && pa_stream_get_state(stream) == PA_STREAM_READY);
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/* latency = 0; */
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/* wait_for_operation(pa_stream_get_latency(stream, latency_func, NULL)); */
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/* pa_operation_unref(pa_stream_get_latency(stream, latency_func, NULL)); */
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latency = pa_stream_get_interpolated_latency(stream, NULL);
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return (float) latency/1000000;
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}
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/** A temporary variable to store the current volume */
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static pa_volume_t volume = PA_VOLUME_NORM;
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/** A callback function that is called when the
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* pa_context_get_sink_input_info() operation completes. Saves the
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* volume field of the specified structure to the global variable volume. */
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static void info_func(struct pa_context *c, const struct pa_sink_input_info *i, int is_last, void *userdata) {
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if (is_last < 0) {
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mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] Failed to get sink input info: %s\n", pa_strerror(pa_context_errno(context)));
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return;
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}
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if (!i)
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return;
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volume = i->volume;
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}
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/** Issue special libao controls on the device */
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static int control(int cmd, void *arg) {
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if (!context || !stream)
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return CONTROL_ERROR;
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switch (cmd) {
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case AOCONTROL_SET_DEVICE:
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/* Change the playback device */
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sink = (char*)arg;
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return CONTROL_OK;
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case AOCONTROL_GET_DEVICE:
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/* Return the playback device */
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*(char**)arg = sink;
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return CONTROL_OK;
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case AOCONTROL_GET_VOLUME: {
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/* Return the current volume of the playback stream */
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ao_control_vol_t *vol = (ao_control_vol_t*) arg;
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volume = PA_VOLUME_NORM;
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wait_for_operation(pa_context_get_sink_input_info(context, pa_stream_get_index(stream), info_func, NULL));
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vol->left = vol->right = (int) (pa_volume_to_user(volume)*100);
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return CONTROL_OK;
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}
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case AOCONTROL_SET_VOLUME: {
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/* Set the playback volume of the stream */
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const ao_control_vol_t *vol = (ao_control_vol_t*) arg;
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int v = vol->left;
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if (vol->right > v)
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v = vol->left;
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wait_for_operation(pa_context_set_sink_input_volume(context, pa_stream_get_index(stream), pa_volume_from_user((double)v/100), NULL, NULL));
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return CONTROL_OK;
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}
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default:
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/* Unknown CONTROL command */
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return CONTROL_UNKNOWN;
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}
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}
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