sndio_enc.c 2.73 KB
Newer Older
Brad's avatar
Brad committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
/*
 * sndio play and grab interface
 * Copyright (c) 2010 Jacob Meuser
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <stdint.h>
#include <sndio.h>

25 26
#include "libavutil/internal.h"

Brad's avatar
Brad committed
27 28
#include "libavformat/avformat.h"

29
#include "libavdevice/sndio.h"
Brad's avatar
Brad committed
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53

static av_cold int audio_write_header(AVFormatContext *s1)
{
    SndioData *s = s1->priv_data;
    AVStream *st;
    int ret;

    st             = s1->streams[0];
    s->sample_rate = st->codec->sample_rate;
    s->channels    = st->codec->channels;

    ret = ff_sndio_open(s1, 1, s1->filename);

    return ret;
}

static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
{
    SndioData *s = s1->priv_data;
    uint8_t *buf= pkt->data;
    int size = pkt->size;
    int len, ret;

    while (size > 0) {
54
        len = FFMIN(s->buffer_size - s->buffer_offset, size);
Brad's avatar
Brad committed
55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88
        memcpy(s->buffer + s->buffer_offset, buf, len);
        buf  += len;
        size -= len;
        s->buffer_offset += len;
        if (s->buffer_offset >= s->buffer_size) {
            ret = sio_write(s->hdl, s->buffer, s->buffer_size);
            if (ret == 0 || sio_eof(s->hdl))
                return AVERROR(EIO);
            s->softpos      += ret;
            s->buffer_offset = 0;
        }
    }

    return 0;
}

static int audio_write_trailer(AVFormatContext *s1)
{
    SndioData *s = s1->priv_data;

    sio_write(s->hdl, s->buffer, s->buffer_offset);

    ff_sndio_close(s);

    return 0;
}

AVOutputFormat ff_sndio_muxer = {
    .name           = "sndio",
    .long_name      = NULL_IF_CONFIG_SMALL("sndio audio playback"),
    .priv_data_size = sizeof(SndioData),
    /* XXX: we make the assumption that the soundcard accepts this format */
    /* XXX: find better solution with "preinit" method, needed also in
       other formats */
89 90
    .audio_codec    = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
    .video_codec    = AV_CODEC_ID_NONE,
Brad's avatar
Brad committed
91 92 93 94 95
    .write_header   = audio_write_header,
    .write_packet   = audio_write_packet,
    .write_trailer  = audio_write_trailer,
    .flags          = AVFMT_NOFILE,
};