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ffmpeg / libavformat / rsoenc.c @ a2704c97

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/*
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 * RSO muxer
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 * Copyright (c) 2001 Fabrice Bellard (original AU code)
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 * Copyright (c) 2010 Rafael Carre
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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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#include "avformat.h"
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#include "internal.h"
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#include "riff.h"
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#include "rso.h"
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static int rso_write_header(AVFormatContext *s)
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{
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    AVIOContext  *pb  = s->pb;
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    AVCodecContext *enc = s->streams[0]->codec;
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    if (!enc->codec_tag)
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        return AVERROR_INVALIDDATA;
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    if (enc->channels != 1) {
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        av_log(s, AV_LOG_ERROR, "RSO only supports mono\n");
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        return AVERROR_INVALIDDATA;
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    }
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    if (url_is_streamed(s->pb)) {
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        av_log(s, AV_LOG_ERROR, "muxer does not support non seekable output\n");
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        return AVERROR_INVALIDDATA;
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    }
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    /* XXX: find legal sample rates (if any) */
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    if (enc->sample_rate >= 1u<<16) {
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        av_log(s, AV_LOG_ERROR, "Sample rate must be < 65536\n");
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        return AVERROR_INVALIDDATA;
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    }
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    if (enc->codec_id == CODEC_ID_ADPCM_IMA_WAV) {
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        av_log(s, AV_LOG_ERROR, "ADPCM in RSO not implemented\n");
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        return AVERROR_PATCHWELCOME;
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    }
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    /* format header */
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    avio_wb16(pb, enc->codec_tag);   /* codec ID */
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    avio_wb16(pb, 0);                /* data size, will be written at EOF */
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    avio_wb16(pb, enc->sample_rate);
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    avio_wb16(pb, 0x0000);           /* play mode ? (0x0000 = don't loop) */
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    put_flush_packet(pb);
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    return 0;
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}
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static int rso_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    avio_write(s->pb, pkt->data, pkt->size);
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    return 0;
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}
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static int rso_write_trailer(AVFormatContext *s)
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{
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    AVIOContext *pb = s->pb;
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    int64_t file_size;
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    uint16_t coded_file_size;
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    file_size = avio_tell(pb);
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    if (file_size < 0)
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        return file_size;
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    if (file_size > 0xffff + RSO_HEADER_SIZE) {
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        av_log(s, AV_LOG_WARNING,
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               "Output file is too big (%"PRId64" bytes >= 64kB)\n", file_size);
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        coded_file_size = 0xffff;
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    } else {
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        coded_file_size = file_size - RSO_HEADER_SIZE;
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    }
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    /* update file size */
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    avio_seek(pb, 2, SEEK_SET);
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    avio_wb16(pb, coded_file_size);
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    avio_seek(pb, file_size, SEEK_SET);
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    put_flush_packet(pb);
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    return 0;
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}
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AVOutputFormat ff_rso_muxer = {
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    .name           =   "rso",
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    .long_name      =   NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO format"),
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    .extensions     =   "rso",
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    .priv_data_size =   0,
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    .audio_codec    =   CODEC_ID_PCM_U8,
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    .video_codec    =   CODEC_ID_NONE,
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    .write_header   =   rso_write_header,
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    .write_packet   =   rso_write_packet,
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    .write_trailer  =   rso_write_trailer,
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    .codec_tag      =   (const AVCodecTag* const []){ff_codec_rso_tags, 0},
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};