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