PeerStreamer

/*

 * Creative Voice File muxer.

 * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>

 *

 * 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 "voc.h"

#include "internal.h"

typedef struct voc_enc_context {

    int param_written;

} VocEncContext;

static int voc_write_header(AVFormatContext *s)

{

    AVIOContext *pb = s->pb;

    const int header_size = 26;

    const int version = 0x0114;

    if (s->nb_streams != 1

        || s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO)

        return AVERROR_PATCHWELCOME;

    avio_write(pb, ff_voc_magic, sizeof(ff_voc_magic) - 1);

    avio_wl16(pb, header_size);

    avio_wl16(pb, version);

    avio_wl16(pb, ~version + 0x1234);

    return 0;

}

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

{

    VocEncContext *voc = s->priv_data;

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

    AVIOContext *pb = s->pb;

    if (!voc->param_written) {

        if (enc->codec_tag > 0xFF) {

            avio_w8(pb, VOC_TYPE_NEW_VOICE_DATA);

            avio_wl24(pb, pkt->size + 12);

            avio_wl32(pb, enc->sample_rate);

            avio_w8(pb, enc->bits_per_coded_sample);

            avio_w8(pb, enc->channels);

            avio_wl16(pb, enc->codec_tag);

            avio_wl32(pb, 0);

        } else {

            if (s->streams[0]->codec->channels > 1) {

                avio_w8(pb, VOC_TYPE_EXTENDED);

                avio_wl24(pb, 4);

                avio_wl16(pb, 65536-256000000/(enc->sample_rate*enc->channels));

                avio_w8(pb, enc->codec_tag);

                avio_w8(pb, enc->channels - 1);

            }

            avio_w8(pb, VOC_TYPE_VOICE_DATA);

            avio_wl24(pb, pkt->size + 2);

            avio_w8(pb, 256 - 1000000 / enc->sample_rate);

            avio_w8(pb, enc->codec_tag);

        }

        voc->param_written = 1;

    } else {

        avio_w8(pb, VOC_TYPE_VOICE_DATA_CONT);

        avio_wl24(pb, pkt->size);

    }

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

    return 0;

}

static int voc_write_trailer(AVFormatContext *s)

{

    avio_w8(s->pb, 0);

    return 0;

}

AVOutputFormat ff_voc_muxer = {

    "voc",

    NULL_IF_CONFIG_SMALL("Creative Voice file format"),

    "audio/x-voc",

    "voc",

    sizeof(VocEncContext),

    CODEC_ID_PCM_U8,

    CODEC_ID_NONE,

    voc_write_header,

    voc_write_packet,

    voc_write_trailer,

    .codec_tag=(const AVCodecTag* const []){ff_voc_codec_tags, 0},

};