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105 lines
3.3 KiB
105 lines
3.3 KiB
/* |
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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 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 "voc.h" |
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#include "internal.h" |
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typedef struct voc_enc_context { |
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int param_written; |
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} VocEncContext; |
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static int voc_write_header(AVFormatContext *s) |
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{ |
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AVIOContext *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]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO) |
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return AVERROR_PATCHWELCOME; |
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avio_write(pb, ff_voc_magic, sizeof(ff_voc_magic) - 1); |
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avio_wl16(pb, header_size); |
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avio_wl16(pb, version); |
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avio_wl16(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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VocEncContext *voc = s->priv_data; |
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AVCodecParameters *par = s->streams[0]->codecpar; |
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AVIOContext *pb = s->pb; |
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if (!voc->param_written) { |
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if (par->codec_tag > 0xFF) { |
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avio_w8(pb, VOC_TYPE_NEW_VOICE_DATA); |
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avio_wl24(pb, pkt->size + 12); |
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avio_wl32(pb, par->sample_rate); |
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avio_w8(pb, par->bits_per_coded_sample); |
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avio_w8(pb, par->channels); |
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avio_wl16(pb, par->codec_tag); |
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avio_wl32(pb, 0); |
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} else { |
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if (s->streams[0]->codecpar->channels > 1) { |
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avio_w8(pb, VOC_TYPE_EXTENDED); |
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avio_wl24(pb, 4); |
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avio_wl16(pb, 65536-256000000/(par->sample_rate*par->channels)); |
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avio_w8(pb, par->codec_tag); |
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avio_w8(pb, par->channels - 1); |
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} |
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avio_w8(pb, VOC_TYPE_VOICE_DATA); |
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avio_wl24(pb, pkt->size + 2); |
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avio_w8(pb, 256 - 1000000 / par->sample_rate); |
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avio_w8(pb, par->codec_tag); |
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} |
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voc->param_written = 1; |
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} else { |
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avio_w8(pb, VOC_TYPE_VOICE_DATA_CONT); |
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avio_wl24(pb, pkt->size); |
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} |
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avio_write(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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avio_w8(s->pb, 0); |
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return 0; |
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} |
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AVOutputFormat ff_voc_muxer = { |
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.name = "voc", |
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.long_name = NULL_IF_CONFIG_SMALL("Creative Voice"), |
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.mime_type = "audio/x-voc", |
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.extensions = "voc", |
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.priv_data_size = sizeof(VocEncContext), |
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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 = voc_write_header, |
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.write_packet = voc_write_packet, |
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.write_trailer = voc_write_trailer, |
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.codec_tag = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 }, |
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.flags = AVFMT_NOTIMESTAMPS, |
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};
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