mirror of
https://github.com/librempeg/librempeg
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104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/*
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* Creative Voice File muxer.
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* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
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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 St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "voc.h"
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typedef struct voc_enc_context {
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int param_written;
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} voc_enc_context_t;
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static int voc_write_header(AVFormatContext *s)
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{
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ByteIOContext *pb = &s->pb;
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const int header_size = 26;
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const int version = 0x0114;
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if (s->nb_streams != 1
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|| s->streams[0]->codec->codec_type != CODEC_TYPE_AUDIO)
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return AVERROR_NOTSUPP;
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put_buffer(pb, voc_magic, sizeof(voc_magic) - 1);
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put_le16(pb, header_size);
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put_le16(pb, version);
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put_le16(pb, ~version + 0x1234);
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return 0;
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}
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static int voc_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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voc_enc_context_t *voc = s->priv_data;
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AVCodecContext *enc = s->streams[0]->codec;
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ByteIOContext *pb = &s->pb;
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if (!voc->param_written) {
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if (enc->codec_tag > 0xFF) {
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put_byte(pb, VOC_TYPE_NEW_VOICE_DATA);
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put_le24(pb, pkt->size + 12);
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put_le32(pb, enc->sample_rate);
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put_byte(pb, enc->bits_per_sample);
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put_byte(pb, enc->channels);
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put_le16(pb, enc->codec_tag);
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put_le32(pb, 0);
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} else {
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if (s->streams[0]->codec->channels > 1) {
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put_byte(pb, VOC_TYPE_EXTENDED);
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put_le24(pb, 4);
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put_le16(pb, 65536-256000000/(enc->sample_rate*enc->channels));
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put_byte(pb, enc->codec_tag);
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put_byte(pb, enc->channels - 1);
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}
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put_byte(pb, VOC_TYPE_VOICE_DATA);
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put_le24(pb, pkt->size + 2);
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put_byte(pb, 256 - 1000000 / enc->sample_rate);
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put_byte(pb, enc->codec_tag);
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}
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voc->param_written = 1;
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} else {
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put_byte(pb, VOC_TYPE_VOICE_DATA_CONT);
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put_le24(pb, pkt->size);
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}
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put_buffer(pb, pkt->data, pkt->size);
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return 0;
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}
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static int voc_write_trailer(AVFormatContext *s)
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{
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put_byte(&s->pb, 0);
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return 0;
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}
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AVOutputFormat voc_muxer = {
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"voc",
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"Creative Voice File format",
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"audio/x-voc",
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"voc",
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sizeof(voc_enc_context_t),
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CODEC_ID_PCM_U8,
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CODEC_ID_NONE,
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voc_write_header,
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voc_write_packet,
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voc_write_trailer,
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.codec_tag=(const AVCodecTag*[]){voc_codec_tags, 0},
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};
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