/* * Creative Voice File demuxer. * 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" static int voc_probe(AVProbeData *p) { int version, check; if (memcmp(p->buf, voc_magic, sizeof(voc_magic) - 1)) return 0; version = AV_RL16(p->buf + 22); check = AV_RL16(p->buf + 24); if (~version + 0x1234 != check) return 10; return AVPROBE_SCORE_MAX; } static int voc_read_header(AVFormatContext *s, AVFormatParameters *ap) { voc_dec_context_t *voc = s->priv_data; ByteIOContext *pb = s->pb; int header_size; AVStream *st; url_fskip(pb, 20); header_size = get_le16(pb) - 22; if (header_size != 4) { av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size); return AVERROR(ENOSYS); } url_fskip(pb, header_size); st = av_new_stream(s, 0); if (!st) return AVERROR(ENOMEM); st->codec->codec_type = CODEC_TYPE_AUDIO; voc->remaining_size = 0; return 0; } int voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size) { voc_dec_context_t *voc = s->priv_data; AVCodecContext *dec = st->codec; ByteIOContext *pb = s->pb; voc_type_t type; int size; int sample_rate = 0; int channels = 1; while (!voc->remaining_size) { type = get_byte(pb); if (type == VOC_TYPE_EOF) return AVERROR(EIO); voc->remaining_size = get_le24(pb); max_size -= 4; switch (type) { case VOC_TYPE_VOICE_DATA: dec->sample_rate = 1000000 / (256 - get_byte(pb)); if (sample_rate) dec->sample_rate = sample_rate; dec->channels = channels; dec->codec_id = codec_get_id(voc_codec_tags, get_byte(pb)); dec->bits_per_sample = av_get_bits_per_sample(dec->codec_id); voc->remaining_size -= 2; max_size -= 2; channels = 1; break; case VOC_TYPE_VOICE_DATA_CONT: break; case VOC_TYPE_EXTENDED: sample_rate = get_le16(pb); get_byte(pb); channels = get_byte(pb) + 1; sample_rate = 256000000 / (channels * (65536 - sample_rate)); voc->remaining_size = 0; max_size -= 4; break; case VOC_TYPE_NEW_VOICE_DATA: dec->sample_rate = get_le32(pb); dec->bits_per_sample = get_byte(pb); dec->channels = get_byte(pb); dec->codec_id = codec_get_id(voc_codec_tags, get_le16(pb)); url_fskip(pb, 4); voc->remaining_size -= 12; max_size -= 12; break; default: url_fskip(pb, voc->remaining_size); max_size -= voc->remaining_size; voc->remaining_size = 0; break; } } dec->bit_rate = dec->sample_rate * dec->bits_per_sample; if (max_size <= 0) max_size = 2048; size = FFMIN(voc->remaining_size, max_size); voc->remaining_size -= size; return av_get_packet(pb, pkt, size); } static int voc_read_packet(AVFormatContext *s, AVPacket *pkt) { return voc_get_packet(s, pkt, s->streams[0], 0); } AVInputFormat voc_demuxer = { "voc", NULL_IF_CONFIG_SMALL("Creative Voice file format"), sizeof(voc_dec_context_t), voc_probe, voc_read_header, voc_read_packet, .codec_tag=(const AVCodecTag*[]){voc_codec_tags, 0}, };