/* * Creative Voice File muxer. * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org> * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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; 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; 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 > 0xFF) { 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)); 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); 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_U8, .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 }, };