yading@11: /*
yading@11:  * RSO muxer
yading@11:  * Copyright (c) 2001 Fabrice Bellard (original AU code)
yading@11:  * Copyright (c) 2010 Rafael Carre
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "riff.h"
yading@11: #include "rso.h"
yading@11: 
yading@11: static int rso_write_header(AVFormatContext *s)
yading@11: {
yading@11:     AVIOContext  *pb  = s->pb;
yading@11:     AVCodecContext *enc = s->streams[0]->codec;
yading@11: 
yading@11:     if (!enc->codec_tag)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     if (enc->channels != 1) {
yading@11:         av_log(s, AV_LOG_ERROR, "RSO only supports mono\n");
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     if (!s->pb->seekable) {
yading@11:         av_log(s, AV_LOG_ERROR, "muxer does not support non seekable output\n");
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     /* XXX: find legal sample rates (if any) */
yading@11:     if (enc->sample_rate >= 1u<<16) {
yading@11:         av_log(s, AV_LOG_ERROR, "Sample rate must be < 65536\n");
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     if (enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
yading@11:         av_log(s, AV_LOG_ERROR, "ADPCM in RSO not implemented\n");
yading@11:         return AVERROR_PATCHWELCOME;
yading@11:     }
yading@11: 
yading@11:     /* format header */
yading@11:     avio_wb16(pb, enc->codec_tag);   /* codec ID */
yading@11:     avio_wb16(pb, 0);                /* data size, will be written at EOF */
yading@11:     avio_wb16(pb, enc->sample_rate);
yading@11:     avio_wb16(pb, 0x0000);           /* play mode ? (0x0000 = don't loop) */
yading@11: 
yading@11:     avio_flush(pb);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int rso_write_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     avio_write(s->pb, pkt->data, pkt->size);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int rso_write_trailer(AVFormatContext *s)
yading@11: {
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int64_t file_size;
yading@11:     uint16_t coded_file_size;
yading@11: 
yading@11:     file_size = avio_tell(pb);
yading@11: 
yading@11:     if (file_size < 0)
yading@11:         return file_size;
yading@11: 
yading@11:     if (file_size > 0xffff + RSO_HEADER_SIZE) {
yading@11:         av_log(s, AV_LOG_WARNING,
yading@11:                "Output file is too big (%"PRId64" bytes >= 64kB)\n", file_size);
yading@11:         coded_file_size = 0xffff;
yading@11:     } else {
yading@11:         coded_file_size = file_size - RSO_HEADER_SIZE;
yading@11:     }
yading@11: 
yading@11:     /* update file size */
yading@11:     avio_seek(pb, 2, SEEK_SET);
yading@11:     avio_wb16(pb, coded_file_size);
yading@11:     avio_seek(pb, file_size, SEEK_SET);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVOutputFormat ff_rso_muxer = {
yading@11:     .name           =   "rso",
yading@11:     .long_name      =   NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO"),
yading@11:     .extensions     =   "rso",
yading@11:     .audio_codec    =   AV_CODEC_ID_PCM_U8,
yading@11:     .video_codec    =   AV_CODEC_ID_NONE,
yading@11:     .write_header   =   rso_write_header,
yading@11:     .write_packet   =   rso_write_packet,
yading@11:     .write_trailer  =   rso_write_trailer,
yading@11:     .codec_tag      =   (const AVCodecTag* const []){ff_codec_rso_tags, 0},
yading@11: };