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99 lines
3.1 KiB
99 lines
3.1 KiB
/* |
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* Creative Voice File demuxer. |
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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 FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "libavutil/intreadwrite.h" |
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#include "voc.h" |
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#include "internal.h" |
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static int voc_probe(AVProbeData *p) |
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{ |
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int version, check; |
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if (memcmp(p->buf, ff_voc_magic, sizeof(ff_voc_magic) - 1)) |
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return 0; |
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version = AV_RL16(p->buf + 22); |
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check = AV_RL16(p->buf + 24); |
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if (~version + 0x1234 != check) |
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return 10; |
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return AVPROBE_SCORE_MAX; |
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} |
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static int voc_read_header(AVFormatContext *s) |
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{ |
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VocDecContext *voc = s->priv_data; |
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AVIOContext *pb = s->pb; |
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int header_size; |
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AVStream *st; |
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avio_skip(pb, 20); |
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header_size = avio_rl16(pb) - 22; |
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if (header_size != 4) { |
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av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size); |
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return AVERROR(ENOSYS); |
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} |
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avio_skip(pb, header_size); |
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st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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voc->remaining_size = 0; |
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return 0; |
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} |
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static int voc_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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return ff_voc_get_packet(s, pkt, s->streams[0], 0); |
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} |
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static int voc_read_seek(AVFormatContext *s, int stream_index, |
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int64_t timestamp, int flags) |
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{ |
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VocDecContext *voc = s->priv_data; |
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AVStream *st = s->streams[stream_index]; |
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int index = av_index_search_timestamp(st, timestamp, flags); |
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if (index >= 0 && index < st->nb_index_entries - 1) { |
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AVIndexEntry *e = &st->index_entries[index]; |
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avio_seek(s->pb, e->pos, SEEK_SET); |
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voc->pts = e->timestamp; |
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voc->remaining_size = e->size; |
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return 0; |
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} else if (st->nb_index_entries && st->index_entries[0].timestamp <= timestamp) { |
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AVIndexEntry *e = &st->index_entries[st->nb_index_entries - 1]; |
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// prepare context for seek_frame_generic() |
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voc->pts = e->timestamp; |
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voc->remaining_size = e->size; |
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} |
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return -1; |
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} |
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AVInputFormat ff_voc_demuxer = { |
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.name = "voc", |
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.long_name = NULL_IF_CONFIG_SMALL("Creative Voice"), |
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.priv_data_size = sizeof(VocDecContext), |
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.read_probe = voc_probe, |
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.read_header = voc_read_header, |
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.read_packet = voc_read_packet, |
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.read_seek = voc_read_seek, |
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.codec_tag = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 }, |
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};
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