PeerStreamer

/*

 * RSO muxer

 * Copyright (c) 2001 Fabrice Bellard (original AU code)

 * Copyright (c) 2010 Rafael Carre

 *

 * 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

 */

#include "avformat.h"

#include "internal.h"

#include "riff.h"

#include "rso.h"

static int rso_write_header(AVFormatContext *s)

{

    ByteIOContext  *pb  = s->pb;

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

    if (!enc->codec_tag)

        return AVERROR_INVALIDDATA;

    if (enc->channels != 1) {

        av_log(s, AV_LOG_ERROR, "RSO only supports mono\n");

        return AVERROR_INVALIDDATA;

    }

    if (url_is_streamed(s->pb)) {

        av_log(s, AV_LOG_ERROR, "muxer does not support non seekable output\n");

        return AVERROR_INVALIDDATA;

    }

    /* XXX: find legal sample rates (if any) */

    if (enc->sample_rate >= 1u<<16) {

        av_log(s, AV_LOG_ERROR, "Sample rate must be < 65536\n");

        return AVERROR_INVALIDDATA;

    }

    if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {

        av_log(s, AV_LOG_ERROR, "ADPCM in RSO not implemented\n");

        return AVERROR_PATCHWELCOME;

    }

    /* format header */

    put_be16(pb, enc->codec_tag);   /* codec ID */

    put_be16(pb, 0);                /* data size, will be written at EOF */

    put_be16(pb, enc->sample_rate);

    put_be16(pb, 0x0000);           /* play mode ? (0x0000 = don't loop) */

    put_flush_packet(pb);

    return 0;

}

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

{

    put_buffer(s->pb, pkt->data, pkt->size);

    return 0;

}

static int rso_write_trailer(AVFormatContext *s)

{

    ByteIOContext *pb = s->pb;

    int64_t file_size;

    uint16_t coded_file_size;

    file_size = url_ftell(pb);

    if (file_size < 0)

        return file_size;

    if (file_size > 0xffff + RSO_HEADER_SIZE) {

        av_log(s, AV_LOG_WARNING,

               "Output file is too big (%"PRId64" bytes >= 64kB)\n", file_size);

        coded_file_size = 0xffff;

    } else {

        coded_file_size = file_size - RSO_HEADER_SIZE;

    }

    /* update file size */

    url_fseek(pb, 2, SEEK_SET);

    put_be16(pb, coded_file_size);

    url_fseek(pb, file_size, SEEK_SET);

    put_flush_packet(pb);

    return 0;

}

AVOutputFormat rso_muxer = {

    .name           =   "rso",

    .long_name      =   NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO format"),

    .extensions     =   "rso",

    .priv_data_size =   0,

    .audio_codec    =   CODEC_ID_PCM_U8,

    .video_codec    =   CODEC_ID_NONE,

    .write_header   =   rso_write_header,

    .write_packet   =   rso_write_packet,

    .write_trailer  =   rso_write_trailer,

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

};