mirror of
https://github.com/librempeg/librempeg
synced 2024-11-23 11:39:47 +00:00
111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
/*
|
|
* Creative Voice File muxer.
|
|
* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "voc.h"
|
|
#include "internal.h"
|
|
|
|
|
|
typedef struct voc_enc_context {
|
|
int param_written;
|
|
} VocEncContext;
|
|
|
|
static int voc_write_header(AVFormatContext *s)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
AVCodecContext *enc = s->streams[0]->codec;
|
|
const int header_size = 26;
|
|
const int version = 0x0114;
|
|
|
|
if (s->nb_streams != 1
|
|
|| s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
|
|
return AVERROR_PATCHWELCOME;
|
|
|
|
if (!enc->codec_tag && enc->codec_id != AV_CODEC_ID_PCM_U8) {
|
|
av_log(s, AV_LOG_ERROR, "unsupported codec\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
avio_write(pb, ff_voc_magic, sizeof(ff_voc_magic) - 1);
|
|
avio_wl16(pb, header_size);
|
|
avio_wl16(pb, version);
|
|
avio_wl16(pb, ~version + 0x1234);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int voc_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
VocEncContext *voc = s->priv_data;
|
|
AVCodecContext *enc = s->streams[0]->codec;
|
|
AVIOContext *pb = s->pb;
|
|
|
|
if (!voc->param_written) {
|
|
if (enc->codec_tag > 3) {
|
|
avio_w8(pb, VOC_TYPE_NEW_VOICE_DATA);
|
|
avio_wl24(pb, pkt->size + 12);
|
|
avio_wl32(pb, enc->sample_rate);
|
|
avio_w8(pb, enc->bits_per_coded_sample);
|
|
avio_w8(pb, enc->channels);
|
|
avio_wl16(pb, enc->codec_tag);
|
|
avio_wl32(pb, 0);
|
|
} else {
|
|
if (s->streams[0]->codec->channels > 1) {
|
|
avio_w8(pb, VOC_TYPE_EXTENDED);
|
|
avio_wl24(pb, 4);
|
|
avio_wl16(pb, 65536-(256000000 + enc->sample_rate*enc->channels/2)/(enc->sample_rate*enc->channels));
|
|
avio_w8(pb, enc->codec_tag);
|
|
avio_w8(pb, enc->channels - 1);
|
|
}
|
|
avio_w8(pb, VOC_TYPE_VOICE_DATA);
|
|
avio_wl24(pb, pkt->size + 2);
|
|
avio_w8(pb, 256 - (1000000 + enc->sample_rate/2) / enc->sample_rate);
|
|
avio_w8(pb, enc->codec_tag);
|
|
}
|
|
voc->param_written = 1;
|
|
} else {
|
|
avio_w8(pb, VOC_TYPE_VOICE_DATA_CONT);
|
|
avio_wl24(pb, pkt->size);
|
|
}
|
|
|
|
avio_write(pb, pkt->data, pkt->size);
|
|
return 0;
|
|
}
|
|
|
|
static int voc_write_trailer(AVFormatContext *s)
|
|
{
|
|
avio_w8(s->pb, 0);
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat ff_voc_muxer = {
|
|
.name = "voc",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Creative Voice"),
|
|
.mime_type = "audio/x-voc",
|
|
.extensions = "voc",
|
|
.priv_data_size = sizeof(VocEncContext),
|
|
.audio_codec = AV_CODEC_ID_PCM_S16LE,
|
|
.video_codec = AV_CODEC_ID_NONE,
|
|
.write_header = voc_write_header,
|
|
.write_packet = voc_write_packet,
|
|
.write_trailer = voc_write_trailer,
|
|
.codec_tag = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 },
|
|
};
|