113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/*
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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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 (!s->pb->seekable) {
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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 == AV_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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avio_flush(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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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"),
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.extensions = "rso",
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.audio_codec = AV_CODEC_ID_PCM_U8,
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.video_codec = AV_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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.flags = AVFMT_NOTIMESTAMPS,
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};
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