mirror of
https://github.com/FFmpeg/FFmpeg.git
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111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/*
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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(const 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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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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s->ctx_flags |= AVFMTCTX_NOHEADER;
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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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if (!s->nb_streams) {
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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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;
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int index;
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if (s->nb_streams < 1) {
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av_log(s, AV_LOG_ERROR, "cannot seek while no stream was found yet\n");
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return AVERROR(EINVAL);
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}
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st = s->streams[stream_index];
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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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