/* * 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 "libavutil/intreadwrite.h" #include "voc.h" #include "internal.h" static int voc_probe(const AVProbeData *p) { int version, check; if (memcmp(p->buf, ff_voc_magic, sizeof(ff_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) { VocDecContext *voc = s->priv_data; AVIOContext *pb = s->pb; int header_size; avio_skip(pb, 20); header_size = avio_rl16(pb) - 22; if (header_size != 4) { av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size); return AVERROR(ENOSYS); } avio_skip(pb, header_size); s->ctx_flags |= AVFMTCTX_NOHEADER; voc->remaining_size = 0; return 0; } static int voc_read_packet(AVFormatContext *s, AVPacket *pkt) { if (!s->nb_streams) { AVStream *st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; } return ff_voc_get_packet(s, pkt, s->streams[0], 0); } static int voc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { VocDecContext *voc = s->priv_data; AVStream *st; FFStream *sti; int index; if (s->nb_streams < 1) { av_log(s, AV_LOG_ERROR, "cannot seek while no stream was found yet\n"); return AVERROR(EINVAL); } st = s->streams[stream_index]; sti = ffstream(st); index = av_index_search_timestamp(st, timestamp, flags); if (index >= 0 && index < sti->nb_index_entries - 1) { const AVIndexEntry *const e = &sti->index_entries[index]; avio_seek(s->pb, e->pos, SEEK_SET); voc->pts = e->timestamp; voc->remaining_size = e->size; return 0; } else if (sti->nb_index_entries && sti->index_entries[0].timestamp <= timestamp) { const AVIndexEntry *const e = &sti->index_entries[sti->nb_index_entries - 1]; // prepare context for seek_frame_generic() voc->pts = e->timestamp; voc->remaining_size = e->size; } return -1; } const AVInputFormat ff_voc_demuxer = { .name = "voc", .long_name = NULL_IF_CONFIG_SMALL("Creative Voice"), .priv_data_size = sizeof(VocDecContext), .read_probe = voc_probe, .read_header = voc_read_header, .read_packet = voc_read_packet, .read_seek = voc_read_seek, .codec_tag = ff_voc_codec_tags_list, };