| /* |
| * 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; |
| 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]; |
| index = av_index_search_timestamp(st, timestamp, flags); |
| |
| if (index >= 0 && index < st->internal->nb_index_entries - 1) { |
| AVIndexEntry *e = &st->internal->index_entries[index]; |
| avio_seek(s->pb, e->pos, SEEK_SET); |
| voc->pts = e->timestamp; |
| voc->remaining_size = e->size; |
| return 0; |
| } else if (st->internal->nb_index_entries && st->internal->index_entries[0].timestamp <= timestamp) { |
| AVIndexEntry *e = &st->internal->index_entries[st->internal->nb_index_entries - 1]; |
| // prepare context for seek_frame_generic() |
| voc->pts = e->timestamp; |
| voc->remaining_size = e->size; |
| } |
| return -1; |
| } |
| |
| 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 = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 }, |
| }; |