Remove trailing whitespace from most files
[mplayer/glamo.git] / libao2 / ao_v4l2.c
blob82c53a226a9d0d6ac8a19c23eed6298a4c7c1da4
1 /*
2 * audio output for V4L2 hardware MPEG decoders
4 * WARNING: You need to force -ac hwmpa for audio output to work.
6 * Copyright (C) 2007 Benjamin Zores
8 * This file is part of MPlayer.
10 * MPlayer is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * MPlayer is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License along
21 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
22 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 #include <inttypes.h>
27 #include "config.h"
29 #include "mp_msg.h"
30 #include "help_mp.h"
32 #include "audio_out.h"
33 #include "audio_out_internal.h"
34 #include "libaf/af_format.h"
35 #include "libmpdemux/mpeg_packetizer.h"
37 #define MPEG_AUDIO_ID 0x1C0
39 static int freq = 0;
41 static const ao_info_t info =
43 "V4L2 MPEG Audio Decoder output",
44 "v4l2",
45 "Benjamin Zores",
49 LIBAO_EXTERN (v4l2)
51 /* to set/get/query special features/parameters */
52 static int
53 control (int cmd,void *arg)
55 return CONTROL_UNKNOWN;
58 /* open & setup audio device */
59 static int
60 init (int rate, int channels, int format, int flags)
62 extern int v4l2_fd;
64 if (v4l2_fd < 0)
65 return 0;
67 if (format != AF_FORMAT_MPEG2)
69 mp_msg (MSGT_AO, MSGL_FATAL,
70 "AO: [v4l2] can only handle MPEG audio streams.\n");
71 return 0;
74 ao_data.outburst = 2048;
75 ao_data.samplerate = rate;
76 ao_data.channels = channels;
77 ao_data.format = AF_FORMAT_MPEG2;
78 ao_data.buffersize = 2048;
79 ao_data.bps = rate * 2 * 2;
80 ao_data.pts = 0;
81 freq = rate;
83 /* check for supported audio rate */
84 if (rate != 32000 || rate != 41000 || rate != 48000)
86 mp_tmsg (MSGT_AO, MSGL_ERR, "[AO MPEGPES] %d Hz not supported, try to resample.\n", rate);
87 rate = 48000;
90 return 1;
93 /* close audio device */
94 static void
95 uninit (int immed)
97 /* nothing to do */
100 /* stop playing and empty buffers (for seeking/pause) */
101 static void
102 reset (void)
104 /* nothing to do */
107 /* stop playing, keep buffers (for pause) */
108 static void
109 audio_pause (void)
111 reset ();
114 /* resume playing, after audio_pause() */
115 static void
116 audio_resume (void)
118 /* nothing to do */
121 /* how many bytes can be played without blocking */
122 static int
123 get_space (void)
125 extern int vo_pts;
126 float x;
127 int y;
129 x = (float) (vo_pts - ao_data.pts) / 90000.0;
130 if (x <= 0)
131 return 0;
133 y = freq * 4 * x;
134 y /= ao_data.outburst;
135 y *= ao_data.outburst;
137 if (y > 32000)
138 y = 32000;
140 return y;
143 /* number of bytes played */
144 static int
145 play (void *data, int len, int flags)
147 int v4l2_write (const unsigned char *data, int len);
149 if (ao_data.format != AF_FORMAT_MPEG2)
150 return 0;
152 send_mpeg_pes_packet (data, len, MPEG_AUDIO_ID, ao_data.pts, 2, v4l2_write);
154 return len;
157 /* delay in seconds between first and last sample in buffer */
158 static float
159 get_delay (void)
161 return 0.0;