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ffmpeg / libavdevice / alsa-audio-common.c @ 2912e87a

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/*
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 * ALSA input and output
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 * Copyright (c) 2007 Luca Abeni ( lucabe72 email it )
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 * Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr )
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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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/**
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 * @file
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 * ALSA input and output: common code
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 * @author Luca Abeni ( lucabe72 email it )
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 * @author Benoit Fouet ( benoit fouet free fr )
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 * @author Nicolas George ( nicolas george normalesup org )
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 */
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#include <alsa/asoundlib.h>
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#include "libavformat/avformat.h"
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#include "alsa-audio.h"
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static av_cold snd_pcm_format_t codec_id_to_pcm_format(int codec_id)
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{
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    switch(codec_id) {
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        case CODEC_ID_PCM_S16LE: return SND_PCM_FORMAT_S16_LE;
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        case CODEC_ID_PCM_S16BE: return SND_PCM_FORMAT_S16_BE;
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        case CODEC_ID_PCM_S8:    return SND_PCM_FORMAT_S8;
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        default:                 return SND_PCM_FORMAT_UNKNOWN;
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    }
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}
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av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode,
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                         unsigned int *sample_rate,
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                         int channels, enum CodecID *codec_id)
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{
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    AlsaData *s = ctx->priv_data;
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    const char *audio_device;
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    int res, flags = 0;
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    snd_pcm_format_t format;
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    snd_pcm_t *h;
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    snd_pcm_hw_params_t *hw_params;
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    snd_pcm_uframes_t buffer_size, period_size;
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    if (ctx->filename[0] == 0) audio_device = "default";
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    else                       audio_device = ctx->filename;
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    if (*codec_id == CODEC_ID_NONE)
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        *codec_id = DEFAULT_CODEC_ID;
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    format = codec_id_to_pcm_format(*codec_id);
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    if (format == SND_PCM_FORMAT_UNKNOWN) {
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        av_log(ctx, AV_LOG_ERROR, "sample format 0x%04x is not supported\n", *codec_id);
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        return AVERROR(ENOSYS);
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    }
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    s->frame_size = av_get_bits_per_sample(*codec_id) / 8 * channels;
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    if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
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        flags = SND_PCM_NONBLOCK;
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    }
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    res = snd_pcm_open(&h, audio_device, mode, flags);
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    if (res < 0) {
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        av_log(ctx, AV_LOG_ERROR, "cannot open audio device %s (%s)\n",
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               audio_device, snd_strerror(res));
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        return AVERROR(EIO);
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    }
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    res = snd_pcm_hw_params_malloc(&hw_params);
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    if (res < 0) {
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        av_log(ctx, AV_LOG_ERROR, "cannot allocate hardware parameter structure (%s)\n",
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               snd_strerror(res));
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        goto fail1;
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    }
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    res = snd_pcm_hw_params_any(h, hw_params);
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    if (res < 0) {
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        av_log(ctx, AV_LOG_ERROR, "cannot initialize hardware parameter structure (%s)\n",
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               snd_strerror(res));
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        goto fail;
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    }
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    res = snd_pcm_hw_params_set_access(h, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
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    if (res < 0) {
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        av_log(ctx, AV_LOG_ERROR, "cannot set access type (%s)\n",
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               snd_strerror(res));
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        goto fail;
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    }
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    res = snd_pcm_hw_params_set_format(h, hw_params, format);
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    if (res < 0) {
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        av_log(ctx, AV_LOG_ERROR, "cannot set sample format 0x%04x %d (%s)\n",
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               *codec_id, format, snd_strerror(res));
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        goto fail;
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    }
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    res = snd_pcm_hw_params_set_rate_near(h, hw_params, sample_rate, 0);
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    if (res < 0) {
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        av_log(ctx, AV_LOG_ERROR, "cannot set sample rate (%s)\n",
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               snd_strerror(res));
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        goto fail;
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    }
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    res = snd_pcm_hw_params_set_channels(h, hw_params, channels);
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    if (res < 0) {
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        av_log(ctx, AV_LOG_ERROR, "cannot set channel count to %d (%s)\n",
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               channels, snd_strerror(res));
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        goto fail;
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    }
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    snd_pcm_hw_params_get_buffer_size_max(hw_params, &buffer_size);
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    /* TODO: maybe use ctx->max_picture_buffer somehow */
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    res = snd_pcm_hw_params_set_buffer_size_near(h, hw_params, &buffer_size);
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    if (res < 0) {
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        av_log(ctx, AV_LOG_ERROR, "cannot set ALSA buffer size (%s)\n",
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               snd_strerror(res));
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        goto fail;
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    }
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    snd_pcm_hw_params_get_period_size_min(hw_params, &period_size, NULL);
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    res = snd_pcm_hw_params_set_period_size_near(h, hw_params, &period_size, NULL);
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    if (res < 0) {
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        av_log(ctx, AV_LOG_ERROR, "cannot set ALSA period size (%s)\n",
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               snd_strerror(res));
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        goto fail;
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    }
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    s->period_size = period_size;
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    res = snd_pcm_hw_params(h, hw_params);
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    if (res < 0) {
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        av_log(ctx, AV_LOG_ERROR, "cannot set parameters (%s)\n",
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               snd_strerror(res));
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        goto fail;
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    }
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    snd_pcm_hw_params_free(hw_params);
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    s->h = h;
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    return 0;
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fail:
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    snd_pcm_hw_params_free(hw_params);
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fail1:
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    snd_pcm_close(h);
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    return AVERROR(EIO);
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}
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av_cold int ff_alsa_close(AVFormatContext *s1)
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{
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    AlsaData *s = s1->priv_data;
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    snd_pcm_close(s->h);
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    return 0;
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}
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int ff_alsa_xrun_recover(AVFormatContext *s1, int err)
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{
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    AlsaData *s = s1->priv_data;
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    snd_pcm_t *handle = s->h;
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    av_log(s1, AV_LOG_WARNING, "ALSA buffer xrun.\n");
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    if (err == -EPIPE) {
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        err = snd_pcm_prepare(handle);
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        if (err < 0) {
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            av_log(s1, AV_LOG_ERROR, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err));
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            return AVERROR(EIO);
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        }
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    } else if (err == -ESTRPIPE) {
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        av_log(s1, AV_LOG_ERROR, "-ESTRPIPE... Unsupported!\n");
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        return -1;
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    }
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    return err;
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}