PeerStreamer

/*

 * SoX native format muxer

 * Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu>

 *

 * Based on libSoX sox-fmt.c

 * Copyright (c) 2008 robs@users.sourceforge.net

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg 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.

 *

 * FFmpeg 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 FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

/**

 * SoX native format muxer

 * @file

 * @author Daniel Verkamp

 * @sa http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format

 */

#include "libavutil/intreadwrite.h"

#include "avformat.h"

#include "avio_internal.h"

#include "sox.h"

typedef struct {

    int64_t header_size;

} SoXContext;

static int sox_write_header(AVFormatContext *s)

{

    SoXContext *sox = s->priv_data;

    AVIOContext *pb = s->pb;

    AVCodecContext *enc = s->streams[0]->codec;

    AVMetadataTag *comment;

    size_t comment_len = 0, comment_size;

    comment = av_metadata_get(s->metadata, "comment", NULL, 0);

    if (comment)

        comment_len = strlen(comment->value);

    comment_size = (comment_len + 7) & ~7;

    sox->header_size = SOX_FIXED_HDR + comment_size;

    if (enc->codec_id == CODEC_ID_PCM_S32LE) {

        ffio_wfourcc(pb, ".SoX");

        avio_wl32(pb, sox->header_size);

        avio_wl64(pb, 0); /* number of samples */

        avio_wl64(pb, av_dbl2int(enc->sample_rate));

        avio_wl32(pb, enc->channels);

        avio_wl32(pb, comment_size);

    } else if (enc->codec_id == CODEC_ID_PCM_S32BE) {

        ffio_wfourcc(pb, "XoS.");

        avio_wb32(pb, sox->header_size);

        avio_wb64(pb, 0); /* number of samples */

        avio_wb64(pb, av_dbl2int(enc->sample_rate));

        avio_wb32(pb, enc->channels);

        avio_wb32(pb, comment_size);

    } else {

        av_log(s, AV_LOG_ERROR, "invalid codec; use pcm_s32le or pcm_s32be\n");

        return -1;

    }

    if (comment_len)

        avio_write(pb, comment->value, comment_len);

    for ( ; comment_size > comment_len; comment_len++)

        avio_w8(pb, 0);

    put_flush_packet(pb);

    return 0;

}

static int sox_write_packet(AVFormatContext *s, AVPacket *pkt)

{

    AVIOContext *pb = s->pb;

    avio_write(pb, pkt->data, pkt->size);

    return 0;

}

static int sox_write_trailer(AVFormatContext *s)

{

    SoXContext *sox = s->priv_data;

    AVIOContext *pb = s->pb;

    AVCodecContext *enc = s->streams[0]->codec;

    if (!url_is_streamed(s->pb)) {

        /* update number of samples */

        int64_t file_size = url_ftell(pb);

        int64_t num_samples = (file_size - sox->header_size - 4LL) >> 2LL;

        url_fseek(pb, 8, SEEK_SET);

        if (enc->codec_id == CODEC_ID_PCM_S32LE) {

            avio_wl64(pb, num_samples);

        } else

            avio_wb64(pb, num_samples);

        url_fseek(pb, file_size, SEEK_SET);

        put_flush_packet(pb);

    }

    return 0;

}

AVOutputFormat ff_sox_muxer = {

    "sox",

    NULL_IF_CONFIG_SMALL("SoX native format"),

    NULL,

    "sox",

    sizeof(SoXContext),

    CODEC_ID_PCM_S32LE,

    CODEC_ID_NONE,

    sox_write_header,

    sox_write_packet,

    sox_write_trailer,

};