mirror of
https://github.com/mpv-player/mpv
synced 2024-09-09 01:16:56 +02:00
159 lines
3.2 KiB
C
159 lines
3.2 KiB
C
/*
|
|
* audio output for V4L2 hardware MPEG decoders
|
|
*
|
|
* WARNING: You need to force -ac hwmpa for audio output to work.
|
|
*
|
|
* Copyright (C) 2007 Benjamin Zores
|
|
*
|
|
* This file is part of MPlayer.
|
|
*
|
|
* MPlayer is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* MPlayer is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include <inttypes.h>
|
|
|
|
#include "config.h"
|
|
|
|
#include "mp_msg.h"
|
|
|
|
#include "audio_out.h"
|
|
#include "audio_out_internal.h"
|
|
#include "libaf/af_format.h"
|
|
#include "libmpdemux/mpeg_packetizer.h"
|
|
#include "libvo/vo_v4l2.h"
|
|
|
|
#define MPEG_AUDIO_ID 0x1C0
|
|
|
|
static int freq = 0;
|
|
|
|
static const ao_info_t info =
|
|
{
|
|
"V4L2 MPEG Audio Decoder output",
|
|
"v4l2",
|
|
"Benjamin Zores",
|
|
""
|
|
};
|
|
|
|
LIBAO_EXTERN (v4l2)
|
|
|
|
/* to set/get/query special features/parameters */
|
|
static int
|
|
control (int cmd,void *arg)
|
|
{
|
|
return CONTROL_UNKNOWN;
|
|
}
|
|
|
|
/* open & setup audio device */
|
|
static int
|
|
init (int rate, int channels, int format, int flags)
|
|
{
|
|
if (v4l2_fd < 0)
|
|
return 0;
|
|
|
|
if (format != AF_FORMAT_MPEG2)
|
|
{
|
|
mp_msg (MSGT_AO, MSGL_FATAL,
|
|
"AO: [v4l2] can only handle MPEG audio streams.\n");
|
|
return 0;
|
|
}
|
|
|
|
ao_data.outburst = 2048;
|
|
ao_data.samplerate = rate;
|
|
ao_data.channels = channels;
|
|
ao_data.format = AF_FORMAT_MPEG2;
|
|
ao_data.buffersize = 2048;
|
|
ao_data.bps = rate * 2 * 2;
|
|
ao_data.brokenpts = 0;
|
|
freq = rate;
|
|
|
|
/* check for supported audio rate */
|
|
if (rate != 32000 || rate != 41000 || rate != 48000)
|
|
{
|
|
mp_tmsg (MSGT_AO, MSGL_ERR, "[AO MPEGPES] %d Hz not supported, try to resample.\n", rate);
|
|
rate = 48000;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* close audio device */
|
|
static void
|
|
uninit (int immed)
|
|
{
|
|
/* nothing to do */
|
|
}
|
|
|
|
/* stop playing and empty buffers (for seeking/pause) */
|
|
static void
|
|
reset (void)
|
|
{
|
|
/* nothing to do */
|
|
}
|
|
|
|
/* stop playing, keep buffers (for pause) */
|
|
static void
|
|
audio_pause (void)
|
|
{
|
|
reset ();
|
|
}
|
|
|
|
/* resume playing, after audio_pause() */
|
|
static void
|
|
audio_resume (void)
|
|
{
|
|
/* nothing to do */
|
|
}
|
|
|
|
/* how many bytes can be played without blocking */
|
|
static int
|
|
get_space (void)
|
|
{
|
|
extern int vo_pts;
|
|
float x;
|
|
int y;
|
|
|
|
x = (float) (vo_pts - ao_data.brokenpts) / 90000.0;
|
|
if (x <= 0)
|
|
return 0;
|
|
|
|
y = freq * 4 * x;
|
|
y /= ao_data.outburst;
|
|
y *= ao_data.outburst;
|
|
|
|
if (y > 32000)
|
|
y = 32000;
|
|
|
|
return y;
|
|
}
|
|
|
|
/* number of bytes played */
|
|
static int
|
|
play (void *data, int len, int flags)
|
|
{
|
|
if (ao_data.format != AF_FORMAT_MPEG2)
|
|
return 0;
|
|
|
|
send_mpeg_pes_packet (data, len, MPEG_AUDIO_ID, ao_data.brokenpts, 2, v4l2_write);
|
|
|
|
return len;
|
|
}
|
|
|
|
/* delay in seconds between first and last sample in buffer */
|
|
static float
|
|
get_delay (void)
|
|
{
|
|
return 0.0;
|
|
}
|