git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3815 c046a42c-6fe2-441c-8c8c-71466251a162
1003 lines
26 KiB
C
1003 lines
26 KiB
C
/*
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* QEMU ALSA audio driver
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*
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* Copyright (c) 2005 Vassili Karpov (malc)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <alsa/asoundlib.h>
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#include "qemu-common.h"
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#include "audio.h"
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#define AUDIO_CAP "alsa"
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#include "audio_int.h"
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typedef struct ALSAVoiceOut {
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HWVoiceOut hw;
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void *pcm_buf;
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snd_pcm_t *handle;
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} ALSAVoiceOut;
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typedef struct ALSAVoiceIn {
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HWVoiceIn hw;
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snd_pcm_t *handle;
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void *pcm_buf;
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} ALSAVoiceIn;
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static struct {
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int size_in_usec_in;
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int size_in_usec_out;
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const char *pcm_name_in;
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const char *pcm_name_out;
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unsigned int buffer_size_in;
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unsigned int period_size_in;
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unsigned int buffer_size_out;
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unsigned int period_size_out;
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unsigned int threshold;
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int buffer_size_in_overridden;
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int period_size_in_overridden;
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int buffer_size_out_overridden;
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int period_size_out_overridden;
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int verbose;
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} conf = {
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#define DEFAULT_BUFFER_SIZE 1024
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#define DEFAULT_PERIOD_SIZE 256
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#ifdef HIGH_LATENCY
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.size_in_usec_in = 1,
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.size_in_usec_out = 1,
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#endif
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.pcm_name_out = "default",
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.pcm_name_in = "default",
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#ifdef HIGH_LATENCY
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.buffer_size_in = 400000,
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.period_size_in = 400000 / 4,
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.buffer_size_out = 400000,
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.period_size_out = 400000 / 4,
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#else
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.buffer_size_in = DEFAULT_BUFFER_SIZE * 4,
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.period_size_in = DEFAULT_PERIOD_SIZE * 4,
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.buffer_size_out = DEFAULT_BUFFER_SIZE,
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.period_size_out = DEFAULT_PERIOD_SIZE,
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.buffer_size_in_overridden = 0,
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.buffer_size_out_overridden = 0,
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.period_size_in_overridden = 0,
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.period_size_out_overridden = 0,
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#endif
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.threshold = 0,
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.verbose = 0
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};
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struct alsa_params_req {
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unsigned int freq;
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audfmt_e fmt;
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unsigned int nchannels;
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unsigned int buffer_size;
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unsigned int period_size;
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};
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struct alsa_params_obt {
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int freq;
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audfmt_e fmt;
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int nchannels;
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snd_pcm_uframes_t samples;
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};
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static void GCC_FMT_ATTR (2, 3) alsa_logerr (int err, const char *fmt, ...)
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{
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va_list ap;
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va_start (ap, fmt);
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AUD_vlog (AUDIO_CAP, fmt, ap);
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va_end (ap);
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AUD_log (AUDIO_CAP, "Reason: %s\n", snd_strerror (err));
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}
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static void GCC_FMT_ATTR (3, 4) alsa_logerr2 (
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int err,
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const char *typ,
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const char *fmt,
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...
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)
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{
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va_list ap;
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AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
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va_start (ap, fmt);
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AUD_vlog (AUDIO_CAP, fmt, ap);
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va_end (ap);
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AUD_log (AUDIO_CAP, "Reason: %s\n", snd_strerror (err));
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}
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static void alsa_anal_close (snd_pcm_t **handlep)
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{
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int err = snd_pcm_close (*handlep);
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if (err) {
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alsa_logerr (err, "Failed to close PCM handle %p\n", *handlep);
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}
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*handlep = NULL;
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}
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static int alsa_write (SWVoiceOut *sw, void *buf, int len)
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{
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return audio_pcm_sw_write (sw, buf, len);
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}
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static int aud_to_alsafmt (audfmt_e fmt)
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{
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switch (fmt) {
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case AUD_FMT_S8:
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return SND_PCM_FORMAT_S8;
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case AUD_FMT_U8:
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return SND_PCM_FORMAT_U8;
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case AUD_FMT_S16:
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return SND_PCM_FORMAT_S16_LE;
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case AUD_FMT_U16:
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return SND_PCM_FORMAT_U16_LE;
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case AUD_FMT_S32:
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return SND_PCM_FORMAT_S32_LE;
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case AUD_FMT_U32:
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return SND_PCM_FORMAT_U32_LE;
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default:
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dolog ("Internal logic error: Bad audio format %d\n", fmt);
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#ifdef DEBUG_AUDIO
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abort ();
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#endif
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return SND_PCM_FORMAT_U8;
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}
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}
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static int alsa_to_audfmt (int alsafmt, audfmt_e *fmt, int *endianness)
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{
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switch (alsafmt) {
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case SND_PCM_FORMAT_S8:
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*endianness = 0;
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*fmt = AUD_FMT_S8;
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break;
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case SND_PCM_FORMAT_U8:
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*endianness = 0;
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*fmt = AUD_FMT_U8;
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break;
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case SND_PCM_FORMAT_S16_LE:
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*endianness = 0;
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*fmt = AUD_FMT_S16;
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break;
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case SND_PCM_FORMAT_U16_LE:
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*endianness = 0;
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*fmt = AUD_FMT_U16;
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break;
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case SND_PCM_FORMAT_S16_BE:
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*endianness = 1;
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*fmt = AUD_FMT_S16;
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break;
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case SND_PCM_FORMAT_U16_BE:
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*endianness = 1;
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*fmt = AUD_FMT_U16;
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break;
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case SND_PCM_FORMAT_S32_LE:
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*endianness = 0;
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*fmt = AUD_FMT_S32;
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break;
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case SND_PCM_FORMAT_U32_LE:
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*endianness = 0;
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*fmt = AUD_FMT_U32;
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break;
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case SND_PCM_FORMAT_S32_BE:
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*endianness = 1;
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*fmt = AUD_FMT_S32;
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break;
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case SND_PCM_FORMAT_U32_BE:
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*endianness = 1;
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*fmt = AUD_FMT_U32;
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break;
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default:
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dolog ("Unrecognized audio format %d\n", alsafmt);
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return -1;
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}
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return 0;
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}
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#if defined DEBUG_MISMATCHES || defined DEBUG
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static void alsa_dump_info (struct alsa_params_req *req,
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struct alsa_params_obt *obt)
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{
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dolog ("parameter | requested value | obtained value\n");
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dolog ("format | %10d | %10d\n", req->fmt, obt->fmt);
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dolog ("channels | %10d | %10d\n",
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req->nchannels, obt->nchannels);
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dolog ("frequency | %10d | %10d\n", req->freq, obt->freq);
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dolog ("============================================\n");
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dolog ("requested: buffer size %d period size %d\n",
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req->buffer_size, req->period_size);
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dolog ("obtained: samples %ld\n", obt->samples);
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}
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#endif
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static void alsa_set_threshold (snd_pcm_t *handle, snd_pcm_uframes_t threshold)
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{
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int err;
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snd_pcm_sw_params_t *sw_params;
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snd_pcm_sw_params_alloca (&sw_params);
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err = snd_pcm_sw_params_current (handle, sw_params);
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if (err < 0) {
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dolog ("Could not fully initialize DAC\n");
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alsa_logerr (err, "Failed to get current software parameters\n");
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return;
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}
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err = snd_pcm_sw_params_set_start_threshold (handle, sw_params, threshold);
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if (err < 0) {
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dolog ("Could not fully initialize DAC\n");
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alsa_logerr (err, "Failed to set software threshold to %ld\n",
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threshold);
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return;
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}
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err = snd_pcm_sw_params (handle, sw_params);
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if (err < 0) {
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dolog ("Could not fully initialize DAC\n");
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alsa_logerr (err, "Failed to set software parameters\n");
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return;
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}
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}
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static int alsa_open (int in, struct alsa_params_req *req,
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struct alsa_params_obt *obt, snd_pcm_t **handlep)
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{
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snd_pcm_t *handle;
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snd_pcm_hw_params_t *hw_params;
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int err;
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unsigned int freq, nchannels;
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const char *pcm_name = in ? conf.pcm_name_in : conf.pcm_name_out;
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unsigned int period_size, buffer_size;
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snd_pcm_uframes_t obt_buffer_size;
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const char *typ = in ? "ADC" : "DAC";
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freq = req->freq;
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period_size = req->period_size;
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buffer_size = req->buffer_size;
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nchannels = req->nchannels;
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snd_pcm_hw_params_alloca (&hw_params);
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err = snd_pcm_open (
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&handle,
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pcm_name,
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in ? SND_PCM_STREAM_CAPTURE : SND_PCM_STREAM_PLAYBACK,
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SND_PCM_NONBLOCK
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);
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if (err < 0) {
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alsa_logerr2 (err, typ, "Failed to open `%s':\n", pcm_name);
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return -1;
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}
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err = snd_pcm_hw_params_any (handle, hw_params);
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if (err < 0) {
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alsa_logerr2 (err, typ, "Failed to initialize hardware parameters\n");
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goto err;
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}
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err = snd_pcm_hw_params_set_access (
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handle,
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hw_params,
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SND_PCM_ACCESS_RW_INTERLEAVED
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);
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if (err < 0) {
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alsa_logerr2 (err, typ, "Failed to set access type\n");
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goto err;
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}
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err = snd_pcm_hw_params_set_format (handle, hw_params, req->fmt);
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if (err < 0) {
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alsa_logerr2 (err, typ, "Failed to set format %d\n", req->fmt);
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goto err;
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}
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err = snd_pcm_hw_params_set_rate_near (handle, hw_params, &freq, 0);
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if (err < 0) {
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alsa_logerr2 (err, typ, "Failed to set frequency %d\n", req->freq);
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goto err;
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}
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err = snd_pcm_hw_params_set_channels_near (
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handle,
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hw_params,
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&nchannels
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);
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if (err < 0) {
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alsa_logerr2 (err, typ, "Failed to set number of channels %d\n",
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req->nchannels);
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goto err;
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}
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|
|
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if (nchannels != 1 && nchannels != 2) {
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alsa_logerr2 (err, typ,
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"Can not handle obtained number of channels %d\n",
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nchannels);
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goto err;
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}
|
|
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if (!((in && conf.size_in_usec_in) || (!in && conf.size_in_usec_out))) {
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if (!buffer_size) {
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buffer_size = DEFAULT_BUFFER_SIZE;
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period_size= DEFAULT_PERIOD_SIZE;
|
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}
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}
|
|
|
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if (buffer_size) {
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if ((in && conf.size_in_usec_in) || (!in && conf.size_in_usec_out)) {
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if (period_size) {
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err = snd_pcm_hw_params_set_period_time_near (
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handle,
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hw_params,
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&period_size,
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0
|
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);
|
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if (err < 0) {
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alsa_logerr2 (err, typ,
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"Failed to set period time %d\n",
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req->period_size);
|
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goto err;
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}
|
|
}
|
|
|
|
err = snd_pcm_hw_params_set_buffer_time_near (
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handle,
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hw_params,
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&buffer_size,
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0
|
|
);
|
|
|
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if (err < 0) {
|
|
alsa_logerr2 (err, typ,
|
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"Failed to set buffer time %d\n",
|
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req->buffer_size);
|
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goto err;
|
|
}
|
|
}
|
|
else {
|
|
int dir;
|
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snd_pcm_uframes_t minval;
|
|
|
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if (period_size) {
|
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minval = period_size;
|
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dir = 0;
|
|
|
|
err = snd_pcm_hw_params_get_period_size_min (
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hw_params,
|
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&minval,
|
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&dir
|
|
);
|
|
if (err < 0) {
|
|
alsa_logerr (
|
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err,
|
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"Could not get minmal period size for %s\n",
|
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typ
|
|
);
|
|
}
|
|
else {
|
|
if (period_size < minval) {
|
|
if ((in && conf.period_size_in_overridden)
|
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|| (!in && conf.period_size_out_overridden)) {
|
|
dolog ("%s period size(%d) is less "
|
|
"than minmal period size(%ld)\n",
|
|
typ,
|
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period_size,
|
|
minval);
|
|
}
|
|
period_size = minval;
|
|
}
|
|
}
|
|
|
|
err = snd_pcm_hw_params_set_period_size (
|
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handle,
|
|
hw_params,
|
|
period_size,
|
|
0
|
|
);
|
|
if (err < 0) {
|
|
alsa_logerr2 (err, typ, "Failed to set period size %d\n",
|
|
req->period_size);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
minval = buffer_size;
|
|
err = snd_pcm_hw_params_get_buffer_size_min (
|
|
hw_params,
|
|
&minval
|
|
);
|
|
if (err < 0) {
|
|
alsa_logerr (err, "Could not get minmal buffer size for %s\n",
|
|
typ);
|
|
}
|
|
else {
|
|
if (buffer_size < minval) {
|
|
if ((in && conf.buffer_size_in_overridden)
|
|
|| (!in && conf.buffer_size_out_overridden)) {
|
|
dolog (
|
|
"%s buffer size(%d) is less "
|
|
"than minimal buffer size(%ld)\n",
|
|
typ,
|
|
buffer_size,
|
|
minval
|
|
);
|
|
}
|
|
buffer_size = minval;
|
|
}
|
|
}
|
|
|
|
err = snd_pcm_hw_params_set_buffer_size (
|
|
handle,
|
|
hw_params,
|
|
buffer_size
|
|
);
|
|
if (err < 0) {
|
|
alsa_logerr2 (err, typ, "Failed to set buffer size %d\n",
|
|
req->buffer_size);
|
|
goto err;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
dolog ("warning: Buffer size is not set\n");
|
|
}
|
|
|
|
err = snd_pcm_hw_params (handle, hw_params);
|
|
if (err < 0) {
|
|
alsa_logerr2 (err, typ, "Failed to apply audio parameters\n");
|
|
goto err;
|
|
}
|
|
|
|
err = snd_pcm_hw_params_get_buffer_size (hw_params, &obt_buffer_size);
|
|
if (err < 0) {
|
|
alsa_logerr2 (err, typ, "Failed to get buffer size\n");
|
|
goto err;
|
|
}
|
|
|
|
err = snd_pcm_prepare (handle);
|
|
if (err < 0) {
|
|
alsa_logerr2 (err, typ, "Could not prepare handle %p\n", handle);
|
|
goto err;
|
|
}
|
|
|
|
if (!in && conf.threshold) {
|
|
snd_pcm_uframes_t threshold;
|
|
int bytes_per_sec;
|
|
|
|
bytes_per_sec = freq
|
|
<< (nchannels == 2)
|
|
<< (req->fmt == AUD_FMT_S16 || req->fmt == AUD_FMT_U16);
|
|
|
|
threshold = (conf.threshold * bytes_per_sec) / 1000;
|
|
alsa_set_threshold (handle, threshold);
|
|
}
|
|
|
|
obt->fmt = req->fmt;
|
|
obt->nchannels = nchannels;
|
|
obt->freq = freq;
|
|
obt->samples = obt_buffer_size;
|
|
*handlep = handle;
|
|
|
|
#if defined DEBUG_MISMATCHES || defined DEBUG
|
|
if (obt->fmt != req->fmt ||
|
|
obt->nchannels != req->nchannels ||
|
|
obt->freq != req->freq) {
|
|
dolog ("Audio paramters mismatch for %s\n", typ);
|
|
alsa_dump_info (req, obt);
|
|
}
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
alsa_dump_info (req, obt);
|
|
#endif
|
|
return 0;
|
|
|
|
err:
|
|
alsa_anal_close (&handle);
|
|
return -1;
|
|
}
|
|
|
|
static int alsa_recover (snd_pcm_t *handle)
|
|
{
|
|
int err = snd_pcm_prepare (handle);
|
|
if (err < 0) {
|
|
alsa_logerr (err, "Failed to prepare handle %p\n", handle);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static snd_pcm_sframes_t alsa_get_avail (snd_pcm_t *handle)
|
|
{
|
|
snd_pcm_sframes_t avail;
|
|
|
|
avail = snd_pcm_avail_update (handle);
|
|
if (avail < 0) {
|
|
if (avail == -EPIPE) {
|
|
if (!alsa_recover (handle)) {
|
|
avail = snd_pcm_avail_update (handle);
|
|
}
|
|
}
|
|
|
|
if (avail < 0) {
|
|
alsa_logerr (avail,
|
|
"Could not obtain number of available frames\n");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return avail;
|
|
}
|
|
|
|
static int alsa_run_out (HWVoiceOut *hw)
|
|
{
|
|
ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
|
|
int rpos, live, decr;
|
|
int samples;
|
|
uint8_t *dst;
|
|
st_sample_t *src;
|
|
snd_pcm_sframes_t avail;
|
|
|
|
live = audio_pcm_hw_get_live_out (hw);
|
|
if (!live) {
|
|
return 0;
|
|
}
|
|
|
|
avail = alsa_get_avail (alsa->handle);
|
|
if (avail < 0) {
|
|
dolog ("Could not get number of available playback frames\n");
|
|
return 0;
|
|
}
|
|
|
|
decr = audio_MIN (live, avail);
|
|
samples = decr;
|
|
rpos = hw->rpos;
|
|
while (samples) {
|
|
int left_till_end_samples = hw->samples - rpos;
|
|
int len = audio_MIN (samples, left_till_end_samples);
|
|
snd_pcm_sframes_t written;
|
|
|
|
src = hw->mix_buf + rpos;
|
|
dst = advance (alsa->pcm_buf, rpos << hw->info.shift);
|
|
|
|
hw->clip (dst, src, len);
|
|
|
|
while (len) {
|
|
written = snd_pcm_writei (alsa->handle, dst, len);
|
|
|
|
if (written <= 0) {
|
|
switch (written) {
|
|
case 0:
|
|
if (conf.verbose) {
|
|
dolog ("Failed to write %d frames (wrote zero)\n", len);
|
|
}
|
|
goto exit;
|
|
|
|
case -EPIPE:
|
|
if (alsa_recover (alsa->handle)) {
|
|
alsa_logerr (written, "Failed to write %d frames\n",
|
|
len);
|
|
goto exit;
|
|
}
|
|
if (conf.verbose) {
|
|
dolog ("Recovering from playback xrun\n");
|
|
}
|
|
continue;
|
|
|
|
case -EAGAIN:
|
|
goto exit;
|
|
|
|
default:
|
|
alsa_logerr (written, "Failed to write %d frames to %p\n",
|
|
len, dst);
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
rpos = (rpos + written) % hw->samples;
|
|
samples -= written;
|
|
len -= written;
|
|
dst = advance (dst, written << hw->info.shift);
|
|
src += written;
|
|
}
|
|
}
|
|
|
|
exit:
|
|
hw->rpos = rpos;
|
|
return decr;
|
|
}
|
|
|
|
static void alsa_fini_out (HWVoiceOut *hw)
|
|
{
|
|
ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
|
|
|
|
ldebug ("alsa_fini\n");
|
|
alsa_anal_close (&alsa->handle);
|
|
|
|
if (alsa->pcm_buf) {
|
|
qemu_free (alsa->pcm_buf);
|
|
alsa->pcm_buf = NULL;
|
|
}
|
|
}
|
|
|
|
static int alsa_init_out (HWVoiceOut *hw, audsettings_t *as)
|
|
{
|
|
ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
|
|
struct alsa_params_req req;
|
|
struct alsa_params_obt obt;
|
|
audfmt_e effective_fmt;
|
|
int endianness;
|
|
int err;
|
|
snd_pcm_t *handle;
|
|
audsettings_t obt_as;
|
|
|
|
req.fmt = aud_to_alsafmt (as->fmt);
|
|
req.freq = as->freq;
|
|
req.nchannels = as->nchannels;
|
|
req.period_size = conf.period_size_out;
|
|
req.buffer_size = conf.buffer_size_out;
|
|
|
|
if (alsa_open (0, &req, &obt, &handle)) {
|
|
return -1;
|
|
}
|
|
|
|
err = alsa_to_audfmt (obt.fmt, &effective_fmt, &endianness);
|
|
if (err) {
|
|
alsa_anal_close (&handle);
|
|
return -1;
|
|
}
|
|
|
|
obt_as.freq = obt.freq;
|
|
obt_as.nchannels = obt.nchannels;
|
|
obt_as.fmt = effective_fmt;
|
|
obt_as.endianness = endianness;
|
|
|
|
audio_pcm_init_info (&hw->info, &obt_as);
|
|
hw->samples = obt.samples;
|
|
|
|
alsa->pcm_buf = audio_calloc (AUDIO_FUNC, obt.samples, 1 << hw->info.shift);
|
|
if (!alsa->pcm_buf) {
|
|
dolog ("Could not allocate DAC buffer (%d samples, each %d bytes)\n",
|
|
hw->samples, 1 << hw->info.shift);
|
|
alsa_anal_close (&handle);
|
|
return -1;
|
|
}
|
|
|
|
alsa->handle = handle;
|
|
return 0;
|
|
}
|
|
|
|
static int alsa_voice_ctl (snd_pcm_t *handle, const char *typ, int pause)
|
|
{
|
|
int err;
|
|
|
|
if (pause) {
|
|
err = snd_pcm_drop (handle);
|
|
if (err < 0) {
|
|
alsa_logerr (err, "Could not stop %s\n", typ);
|
|
return -1;
|
|
}
|
|
}
|
|
else {
|
|
err = snd_pcm_prepare (handle);
|
|
if (err < 0) {
|
|
alsa_logerr (err, "Could not prepare handle for %s\n", typ);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int alsa_ctl_out (HWVoiceOut *hw, int cmd, ...)
|
|
{
|
|
ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
|
|
|
|
switch (cmd) {
|
|
case VOICE_ENABLE:
|
|
ldebug ("enabling voice\n");
|
|
return alsa_voice_ctl (alsa->handle, "playback", 0);
|
|
|
|
case VOICE_DISABLE:
|
|
ldebug ("disabling voice\n");
|
|
return alsa_voice_ctl (alsa->handle, "playback", 1);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int alsa_init_in (HWVoiceIn *hw, audsettings_t *as)
|
|
{
|
|
ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
|
|
struct alsa_params_req req;
|
|
struct alsa_params_obt obt;
|
|
int endianness;
|
|
int err;
|
|
audfmt_e effective_fmt;
|
|
snd_pcm_t *handle;
|
|
audsettings_t obt_as;
|
|
|
|
req.fmt = aud_to_alsafmt (as->fmt);
|
|
req.freq = as->freq;
|
|
req.nchannels = as->nchannels;
|
|
req.period_size = conf.period_size_in;
|
|
req.buffer_size = conf.buffer_size_in;
|
|
|
|
if (alsa_open (1, &req, &obt, &handle)) {
|
|
return -1;
|
|
}
|
|
|
|
err = alsa_to_audfmt (obt.fmt, &effective_fmt, &endianness);
|
|
if (err) {
|
|
alsa_anal_close (&handle);
|
|
return -1;
|
|
}
|
|
|
|
obt_as.freq = obt.freq;
|
|
obt_as.nchannels = obt.nchannels;
|
|
obt_as.fmt = effective_fmt;
|
|
obt_as.endianness = endianness;
|
|
|
|
audio_pcm_init_info (&hw->info, &obt_as);
|
|
hw->samples = obt.samples;
|
|
|
|
alsa->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
|
|
if (!alsa->pcm_buf) {
|
|
dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
|
|
hw->samples, 1 << hw->info.shift);
|
|
alsa_anal_close (&handle);
|
|
return -1;
|
|
}
|
|
|
|
alsa->handle = handle;
|
|
return 0;
|
|
}
|
|
|
|
static void alsa_fini_in (HWVoiceIn *hw)
|
|
{
|
|
ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
|
|
|
|
alsa_anal_close (&alsa->handle);
|
|
|
|
if (alsa->pcm_buf) {
|
|
qemu_free (alsa->pcm_buf);
|
|
alsa->pcm_buf = NULL;
|
|
}
|
|
}
|
|
|
|
static int alsa_run_in (HWVoiceIn *hw)
|
|
{
|
|
ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
|
|
int hwshift = hw->info.shift;
|
|
int i;
|
|
int live = audio_pcm_hw_get_live_in (hw);
|
|
int dead = hw->samples - live;
|
|
int decr;
|
|
struct {
|
|
int add;
|
|
int len;
|
|
} bufs[2] = {
|
|
{ hw->wpos, 0 },
|
|
{ 0, 0 }
|
|
};
|
|
snd_pcm_sframes_t avail;
|
|
snd_pcm_uframes_t read_samples = 0;
|
|
|
|
if (!dead) {
|
|
return 0;
|
|
}
|
|
|
|
avail = alsa_get_avail (alsa->handle);
|
|
if (avail < 0) {
|
|
dolog ("Could not get number of captured frames\n");
|
|
return 0;
|
|
}
|
|
|
|
if (!avail && (snd_pcm_state (alsa->handle) == SND_PCM_STATE_PREPARED)) {
|
|
avail = hw->samples;
|
|
}
|
|
|
|
decr = audio_MIN (dead, avail);
|
|
if (!decr) {
|
|
return 0;
|
|
}
|
|
|
|
if (hw->wpos + decr > hw->samples) {
|
|
bufs[0].len = (hw->samples - hw->wpos);
|
|
bufs[1].len = (decr - (hw->samples - hw->wpos));
|
|
}
|
|
else {
|
|
bufs[0].len = decr;
|
|
}
|
|
|
|
for (i = 0; i < 2; ++i) {
|
|
void *src;
|
|
st_sample_t *dst;
|
|
snd_pcm_sframes_t nread;
|
|
snd_pcm_uframes_t len;
|
|
|
|
len = bufs[i].len;
|
|
|
|
src = advance (alsa->pcm_buf, bufs[i].add << hwshift);
|
|
dst = hw->conv_buf + bufs[i].add;
|
|
|
|
while (len) {
|
|
nread = snd_pcm_readi (alsa->handle, src, len);
|
|
|
|
if (nread <= 0) {
|
|
switch (nread) {
|
|
case 0:
|
|
if (conf.verbose) {
|
|
dolog ("Failed to read %ld frames (read zero)\n", len);
|
|
}
|
|
goto exit;
|
|
|
|
case -EPIPE:
|
|
if (alsa_recover (alsa->handle)) {
|
|
alsa_logerr (nread, "Failed to read %ld frames\n", len);
|
|
goto exit;
|
|
}
|
|
if (conf.verbose) {
|
|
dolog ("Recovering from capture xrun\n");
|
|
}
|
|
continue;
|
|
|
|
case -EAGAIN:
|
|
goto exit;
|
|
|
|
default:
|
|
alsa_logerr (
|
|
nread,
|
|
"Failed to read %ld frames from %p\n",
|
|
len,
|
|
src
|
|
);
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
hw->conv (dst, src, nread, &nominal_volume);
|
|
|
|
src = advance (src, nread << hwshift);
|
|
dst += nread;
|
|
|
|
read_samples += nread;
|
|
len -= nread;
|
|
}
|
|
}
|
|
|
|
exit:
|
|
hw->wpos = (hw->wpos + read_samples) % hw->samples;
|
|
return read_samples;
|
|
}
|
|
|
|
static int alsa_read (SWVoiceIn *sw, void *buf, int size)
|
|
{
|
|
return audio_pcm_sw_read (sw, buf, size);
|
|
}
|
|
|
|
static int alsa_ctl_in (HWVoiceIn *hw, int cmd, ...)
|
|
{
|
|
ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
|
|
|
|
switch (cmd) {
|
|
case VOICE_ENABLE:
|
|
ldebug ("enabling voice\n");
|
|
return alsa_voice_ctl (alsa->handle, "capture", 0);
|
|
|
|
case VOICE_DISABLE:
|
|
ldebug ("disabling voice\n");
|
|
return alsa_voice_ctl (alsa->handle, "capture", 1);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static void *alsa_audio_init (void)
|
|
{
|
|
return &conf;
|
|
}
|
|
|
|
static void alsa_audio_fini (void *opaque)
|
|
{
|
|
(void) opaque;
|
|
}
|
|
|
|
static struct audio_option alsa_options[] = {
|
|
{"DAC_SIZE_IN_USEC", AUD_OPT_BOOL, &conf.size_in_usec_out,
|
|
"DAC period/buffer size in microseconds (otherwise in frames)", NULL, 0},
|
|
{"DAC_PERIOD_SIZE", AUD_OPT_INT, &conf.period_size_out,
|
|
"DAC period size", &conf.period_size_out_overridden, 0},
|
|
{"DAC_BUFFER_SIZE", AUD_OPT_INT, &conf.buffer_size_out,
|
|
"DAC buffer size", &conf.buffer_size_out_overridden, 0},
|
|
|
|
{"ADC_SIZE_IN_USEC", AUD_OPT_BOOL, &conf.size_in_usec_in,
|
|
"ADC period/buffer size in microseconds (otherwise in frames)", NULL, 0},
|
|
{"ADC_PERIOD_SIZE", AUD_OPT_INT, &conf.period_size_in,
|
|
"ADC period size", &conf.period_size_in_overridden, 0},
|
|
{"ADC_BUFFER_SIZE", AUD_OPT_INT, &conf.buffer_size_in,
|
|
"ADC buffer size", &conf.buffer_size_in_overridden, 0},
|
|
|
|
{"THRESHOLD", AUD_OPT_INT, &conf.threshold,
|
|
"(undocumented)", NULL, 0},
|
|
|
|
{"DAC_DEV", AUD_OPT_STR, &conf.pcm_name_out,
|
|
"DAC device name (for instance dmix)", NULL, 0},
|
|
|
|
{"ADC_DEV", AUD_OPT_STR, &conf.pcm_name_in,
|
|
"ADC device name", NULL, 0},
|
|
|
|
{"VERBOSE", AUD_OPT_BOOL, &conf.verbose,
|
|
"Behave in a more verbose way", NULL, 0},
|
|
|
|
{NULL, 0, NULL, NULL, NULL, 0}
|
|
};
|
|
|
|
static struct audio_pcm_ops alsa_pcm_ops = {
|
|
alsa_init_out,
|
|
alsa_fini_out,
|
|
alsa_run_out,
|
|
alsa_write,
|
|
alsa_ctl_out,
|
|
|
|
alsa_init_in,
|
|
alsa_fini_in,
|
|
alsa_run_in,
|
|
alsa_read,
|
|
alsa_ctl_in
|
|
};
|
|
|
|
struct audio_driver alsa_audio_driver = {
|
|
INIT_FIELD (name = ) "alsa",
|
|
INIT_FIELD (descr = ) "ALSA http://www.alsa-project.org",
|
|
INIT_FIELD (options = ) alsa_options,
|
|
INIT_FIELD (init = ) alsa_audio_init,
|
|
INIT_FIELD (fini = ) alsa_audio_fini,
|
|
INIT_FIELD (pcm_ops = ) &alsa_pcm_ops,
|
|
INIT_FIELD (can_be_default = ) 1,
|
|
INIT_FIELD (max_voices_out = ) INT_MAX,
|
|
INIT_FIELD (max_voices_in = ) INT_MAX,
|
|
INIT_FIELD (voice_size_out = ) sizeof (ALSAVoiceOut),
|
|
INIT_FIELD (voice_size_in = ) sizeof (ALSAVoiceIn)
|
|
};
|