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ffmpeg / libavdevice / sndio_common.c @ 2eddfb2b

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/*
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 * sndio play and grab interface
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 * Copyright (c) 2010 Jacob Meuser
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav 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 GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <stdint.h>
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#include <sndio.h>
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#include "libavformat/avformat.h"
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#include "sndio_common.h"
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static inline void movecb(void *addr, int delta)
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{
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    SndioData *s = addr;
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    s->hwpos += delta * s->channels * s->bps;
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}
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av_cold int ff_sndio_open(AVFormatContext *s1, int is_output,
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                          const char *audio_device)
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{
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    SndioData *s = s1->priv_data;
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    struct sio_hdl *hdl;
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    struct sio_par par;
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    hdl = sio_open(audio_device, is_output ? SIO_PLAY : SIO_REC, 0);
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    if (!hdl) {
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        av_log(s1, AV_LOG_ERROR, "Could not open sndio device\n");
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        return AVERROR(EIO);
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    }
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    sio_initpar(&par);
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    par.bits = 16;
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    par.sig  = 1;
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    par.le   = SIO_LE_NATIVE;
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    if (is_output)
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        par.pchan = s->channels;
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    else
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        par.rchan = s->channels;
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    par.rate = s->sample_rate;
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    if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par)) {
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        av_log(s1, AV_LOG_ERROR, "Impossible to set sndio parameters, "
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               "channels: %d sample rate: %d\n", s->channels, s->sample_rate);
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        goto fail;
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    }
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    if (par.bits != 16 || par.sig != 1 ||
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        (is_output  && (par.pchan != s->channels)) ||
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        (!is_output && (par.rchan != s->channels)) ||
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        (par.rate != s->sample_rate)) {
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        av_log(s1, AV_LOG_ERROR, "Could not set appropriate sndio parameters, "
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               "channels: %d sample rate: %d\n", s->channels, s->sample_rate);
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        goto fail;
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    }
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    s->buffer_size = par.round * par.bps *
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                     (is_output ? par.pchan : par.rchan);
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    if (is_output) {
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        s->buffer = av_malloc(s->buffer_size);
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        if (!s->buffer) {
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            av_log(s1, AV_LOG_ERROR, "Could not allocate buffer\n");
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            goto fail;
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        }
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    }
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    s->codec_id    = par.le ? CODEC_ID_PCM_S16LE : CODEC_ID_PCM_S16BE;
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    s->channels    = is_output ? par.pchan : par.rchan;
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    s->sample_rate = par.rate;
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    s->bps         = par.bps;
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    sio_onmove(hdl, movecb, s);
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    if (!sio_start(hdl)) {
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        av_log(s1, AV_LOG_ERROR, "Could not start sndio\n");
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        goto fail;
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    }
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    s->hdl = hdl;
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    return 0;
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fail:
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    av_freep(&s->buffer);
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    if (hdl)
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        sio_close(hdl);
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    return AVERROR(EIO);
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}
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int ff_sndio_close(SndioData *s)
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{
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    av_freep(&s->buffer);
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    if (s->hdl)
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        sio_close(s->hdl);
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    return 0;
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}