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mpv/libao2/ao_esd.c
attila 5cd067e6a0 This patch contains bugfixes for the esd audio output driver that I
uncovered while trying to send sound to a remote esd server over a
wireless (11 mbs, just enough to handle to sound) link.

First, the sound was full "ticking" sounds.  I found a bug that
prevented the "send the remainder of this block" code from ever being
called - so large chunks of audio were simply being ignored.  Fixing
this bug removed the "ticking" from audio streams.

Fixing this bug, however, uncovered another problem - when the socket
buffer was full, doing a blocking write to finish the buffer would take
far too long and would turn video into a chunky mess.  I'd imagine this
blocking write would be fine for an audio-only stream, but it turns out
to hold up the video far too much.

The solution in this patch is to write as much data as possible to the
socket, and then return as soon as possible, reporting the number of
bytes actually written accurately back to mplayer.  I've tested it on
both local and remote esd servers, and it works well.

Patch by Benjamin Osheroff <ben@gimbo.net>


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@11620 b3059339-0415-0410-9bf9-f77b7e298cf2
2003-12-10 12:19:13 +00:00

466 lines
11 KiB
C

/*
* ao_esd - EsounD audio output driver for MPlayer
*
* Juergen Keil <jk@tools.de>
*
* This driver is distributed under the terms of the GPL
*
* TODO / known problems:
* - does not work well when the esd daemon has autostandby disabled
* (workaround: run esd with option "-as 2" - fortunatelly this is
* the default)
* - plays noise on a linux 2.4.4 kernel with a SB16PCI card, when using
* a local tcp connection to the esd daemon; there is no noise when using
* a unix domain socket connection.
* (there are EIO errors reported by the sound card driver, so this is
* most likely a linux sound card driver problem)
*/
#include "../config.h"
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>
#ifdef __svr4__
#include <stropts.h>
#endif
#include <esd.h>
#include "audio_out.h"
#include "audio_out_internal.h"
#include "afmt.h"
#include "../config.h"
#include "../mp_msg.h"
#undef ESD_DEBUG
#if ESD_DEBUG
#define dprintf(...) printf(__VA_ARGS__)
#else
#define dprintf(...) /**/
#endif
#define ESD_CLIENT_NAME "MPlayer"
#define ESD_MAX_DELAY (1.0f) /* max amount of data buffered in esd (#sec) */
static ao_info_t info =
{
"EsounD audio output",
"esd",
"Juergen Keil <jk@tools.de>",
""
};
LIBAO_EXTERN(esd)
static int esd_fd = -1;
static int esd_play_fd = -1;
static esd_server_info_t *esd_svinfo;
static int esd_latency;
static int esd_bytes_per_sample;
static unsigned long esd_samples_written;
static struct timeval esd_play_start;
extern float audio_delay;
/*
* to set/get/query special features/parameters
*/
static int control(int cmd, void *arg)
{
esd_player_info_t *esd_pi;
esd_info_t *esd_i;
time_t now;
static time_t vol_cache_time;
static ao_control_vol_t vol_cache;
switch (cmd) {
case AOCONTROL_GET_VOLUME:
time(&now);
if (now == vol_cache_time) {
*(ao_control_vol_t *)arg = vol_cache;
return CONTROL_OK;
}
dprintf("esd: get vol\n");
if ((esd_i = esd_get_all_info(esd_fd)) == NULL)
return CONTROL_ERROR;
for (esd_pi = esd_i->player_list; esd_pi != NULL; esd_pi = esd_pi->next)
if (strcmp(esd_pi->name, ESD_CLIENT_NAME) == 0)
break;
if (esd_pi != NULL) {
ao_control_vol_t *vol = (ao_control_vol_t *)arg;
vol->left = esd_pi->left_vol_scale * 100 / ESD_VOLUME_BASE;
vol->right = esd_pi->right_vol_scale * 100 / ESD_VOLUME_BASE;
vol_cache = *vol;
vol_cache_time = now;
}
esd_free_all_info(esd_i);
return CONTROL_OK;
case AOCONTROL_SET_VOLUME:
dprintf("esd: set vol\n");
if ((esd_i = esd_get_all_info(esd_fd)) == NULL)
return CONTROL_ERROR;
for (esd_pi = esd_i->player_list; esd_pi != NULL; esd_pi = esd_pi->next)
if (strcmp(esd_pi->name, ESD_CLIENT_NAME) == 0)
break;
if (esd_pi != NULL) {
ao_control_vol_t *vol = (ao_control_vol_t *)arg;
esd_set_stream_pan(esd_fd, esd_pi->source_id,
vol->left * ESD_VOLUME_BASE / 100,
vol->right * ESD_VOLUME_BASE / 100);
vol_cache = *vol;
time(&vol_cache_time);
}
esd_free_all_info(esd_i);
return CONTROL_OK;
default:
return CONTROL_UNKNOWN;
}
}
/*
* open & setup audio device
* return: 1=success 0=fail
*/
static int init(int rate_hz, int channels, int format, int flags)
{
esd_format_t esd_fmt;
int bytes_per_sample;
int fl;
char *server = ao_subdevice; /* NULL for localhost */
float lag_seconds, lag_net, lag_serv;
struct timeval proto_start, proto_end;
if (esd_fd < 0) {
esd_fd = esd_open_sound(server);
if (esd_fd < 0) {
mp_msg(MSGT_AO, MSGL_ERR,
"AO: [esd] esd_open_sound failed: %s\n",
strerror(errno));
return 0;
}
/* get server info, and measure network latency */
gettimeofday(&proto_start, NULL);
esd_svinfo = esd_get_server_info(esd_fd);
if(server) {
gettimeofday(&proto_end, NULL);
lag_net = (proto_end.tv_sec - proto_start.tv_sec) +
(proto_end.tv_usec - proto_start.tv_usec) / 1000000.0;
lag_net /= 2.0; /* round trip -> one way */
} else
lag_net = 0.0; /* no network lag */
/*
if (esd_svinfo) {
mp_msg(MSGT_AO, MSGL_INFO, "AO: [esd] server info:\n");
esd_print_server_info(esd_svinfo);
}
*/
}
esd_fmt = ESD_STREAM | ESD_PLAY;
#if ESD_RESAMPLES
/* let the esd daemon convert sample rate */
#else
/* let mplayer's audio filter convert the sample rate */
if (esd_svinfo != NULL)
rate_hz = esd_svinfo->rate;
#endif
ao_data.samplerate = rate_hz;
/* EsounD can play mono or stereo */
switch (channels) {
case 1:
esd_fmt |= ESD_MONO;
ao_data.channels = bytes_per_sample = 1;
break;
default:
esd_fmt |= ESD_STEREO;
ao_data.channels = bytes_per_sample = 2;
break;
}
/* EsounD can play 8bit unsigned and 16bit signed native */
switch (format) {
case AFMT_S8:
case AFMT_U8:
esd_fmt |= ESD_BITS8;
ao_data.format = AFMT_U8;
break;
default:
esd_fmt |= ESD_BITS16;
ao_data.format = AFMT_S16_NE;
bytes_per_sample *= 2;
break;
}
/* modify audio_delay depending on esd_latency
* latency is number of samples @ 44.1khz stereo 16 bit
* adjust according to rate_hz & bytes_per_sample
*/
#ifdef HAVE_ESD_LATENCY
esd_latency = esd_get_latency(esd_fd);
#else
esd_latency = ((channels == 1 ? 2 : 1) * ESD_DEFAULT_RATE *
(ESD_BUF_SIZE + 64 * (4.0f / bytes_per_sample))
) / rate_hz;
esd_latency += ESD_BUF_SIZE * 2;
#endif
if(esd_latency > 0) {
lag_serv = (esd_latency * 4.0f) / (bytes_per_sample * rate_hz);
lag_seconds = lag_net + lag_serv;
audio_delay += lag_seconds;
mp_msg(MSGT_AO, MSGL_INFO,
"AO: [esd] latency: [server: %0.2fs, net: %0.2fs] "
"(adjust %0.2fs)\n", lag_serv, lag_net, lag_seconds);
}
esd_play_fd = esd_play_stream_fallback(esd_fmt, rate_hz,
server, ESD_CLIENT_NAME);
if (esd_play_fd < 0) {
mp_msg(MSGT_AO, MSGL_ERR,
"AO: [esd] failed to open esd playback stream: %s\n",
strerror(errno));
return 0;
}
/* enable non-blocking i/o on the socket connection to the esd server */
if ((fl = fcntl(esd_play_fd, F_GETFL)) >= 0)
fcntl(esd_play_fd, F_SETFL, O_NDELAY|fl);
#if ESD_DEBUG
{
int sbuf, rbuf, len;
len = sizeof(sbuf);
getsockopt(esd_play_fd, SOL_SOCKET, SO_SNDBUF, &sbuf, &len);
len = sizeof(rbuf);
getsockopt(esd_play_fd, SOL_SOCKET, SO_RCVBUF, &rbuf, &len);
dprintf("esd: send/receive socket buffer space %d/%d bytes\n",
sbuf, rbuf);
}
#endif
ao_data.bps = bytes_per_sample * rate_hz;
ao_data.outburst = ao_data.bps > 100000 ? 4*ESD_BUF_SIZE : 2*ESD_BUF_SIZE;
esd_play_start.tv_sec = 0;
esd_samples_written = 0;
esd_bytes_per_sample = bytes_per_sample;
return 1;
}
/*
* close audio device
*/
static void uninit()
{
if (esd_play_fd >= 0) {
esd_close(esd_play_fd);
esd_play_fd = -1;
}
if (esd_svinfo) {
esd_free_server_info(esd_svinfo);
esd_svinfo = NULL;
}
if (esd_fd >= 0) {
esd_close(esd_fd);
esd_fd = -1;
}
}
/*
* 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 offs;
int nwritten;
int nsamples;
int remainder, n;
int saved_fl;
/* round down buffersize to a multiple of ESD_BUF_SIZE bytes */
len = len / ESD_BUF_SIZE * ESD_BUF_SIZE;
if (len <= 0)
return 0;
#define SINGLE_WRITE 0
#if SINGLE_WRITE
nwritten = write(esd_play_fd, data, len);
#else
for (offs = 0, nwritten=0; offs + ESD_BUF_SIZE <= len; offs += ESD_BUF_SIZE) {
/*
* note: we're writing to a non-blocking socket here.
* A partial write means, that the socket buffer is full.
*/
n = write(esd_play_fd, (char*)data + offs, ESD_BUF_SIZE);
if ( n < 0 ) {
if ( errno != EAGAIN )
dprintf("esd play: write failed: %s\n", strerror(errno));
break;
} else if ( n != ESD_BUF_SIZE ) {
nwritten += n;
break;
} else
nwritten += n;
}
#endif
if (nwritten > 0) {
if (!esd_play_start.tv_sec)
gettimeofday(&esd_play_start, NULL);
nsamples = nwritten / esd_bytes_per_sample;
esd_samples_written += nsamples;
dprintf("esd play: %d %lu\n", nsamples, esd_samples_written);
} else {
dprintf("esd play: blocked / %lu\n", esd_samples_written);
}
return nwritten;
}
/*
* stop playing, keep buffers (for pause)
*/
static void audio_pause()
{
/*
* not possible with esd. the esd daemom will continue playing
* buffered data (not more than ESD_MAX_DELAY seconds of samples)
*/
}
/*
* resume playing, after audio_pause()
*/
static void audio_resume()
{
/*
* not possible with esd.
*
* Let's hope the pause was long enough that the esd ran out of
* buffered data; we restart our time based delay computation
* for an audio resume.
*/
esd_play_start.tv_sec = 0;
esd_samples_written = 0;
}
/*
* stop playing and empty buffers (for seeking/pause)
*/
static void reset()
{
#ifdef __svr4__
/* throw away data buffered in the esd connection */
if (ioctl(esd_play_fd, I_FLUSH, FLUSHW))
perror("I_FLUSH");
#endif
}
/*
* return: how many bytes can be played without blocking
*/
static int get_space()
{
struct timeval tmout;
fd_set wfds;
float current_delay;
int space;
/*
* Don't buffer too much data in the esd daemon.
*
* If we send too much, esd will block in write()s to the sound
* device, and the consequence is a huge slow down for things like
* esd_get_all_info().
*/
if ((current_delay = get_delay()) >= ESD_MAX_DELAY) {
dprintf("esd get_space: too much data buffered\n");
return 0;
}
FD_ZERO(&wfds);
FD_SET(esd_play_fd, &wfds);
tmout.tv_sec = 0;
tmout.tv_usec = 0;
if (select(esd_play_fd + 1, NULL, &wfds, NULL, &tmout) != 1)
return 0;
if (!FD_ISSET(esd_play_fd, &wfds))
return 0;
/* try to fill 50% of the remaining "free" buffer space */
space = (ESD_MAX_DELAY - current_delay) * ao_data.bps * 0.5f;
/* round up to next multiple of ESD_BUF_SIZE */
space = (space + ESD_BUF_SIZE-1) / ESD_BUF_SIZE * ESD_BUF_SIZE;
dprintf("esd get_space: %d\n", space);
return space;
}
/*
* return: delay in seconds between first and last sample in buffer
*/
static float get_delay()
{
struct timeval now;
double buffered_samples_time;
double play_time;
if (!esd_play_start.tv_sec)
return 0;
buffered_samples_time = (float)esd_samples_written / ao_data.samplerate;
gettimeofday(&now, NULL);
play_time = now.tv_sec - esd_play_start.tv_sec;
play_time += (now.tv_usec - esd_play_start.tv_usec) / 1000000.;
/* dprintf("esd delay: %f %f\n", play_time, buffered_samples_time); */
if (play_time > buffered_samples_time) {
dprintf("esd: underflow\n");
esd_play_start.tv_sec = 0;
esd_samples_written = 0;
return 0;
}
dprintf("esd: get_delay %f\n", buffered_samples_time - play_time);
return buffered_samples_time - play_time;
}