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113 lines
3.3 KiB
113 lines
3.3 KiB
/* |
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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 (!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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avio_flush(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"), |
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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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};
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