| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Creative Voice File demuxer. | ||
| 3 | * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org> | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "libavutil/intreadwrite.h" | ||
| 23 | #include "demux.h" | ||
| 24 | #include "voc.h" | ||
| 25 | #include "internal.h" | ||
| 26 | |||
| 27 | 7282 | static int voc_probe(const AVProbeData *p) | |
| 28 | { | ||
| 29 | int version, check; | ||
| 30 | |||
| 31 |
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7282 | if (memcmp(p->buf, ff_voc_magic, sizeof(ff_voc_magic) - 1)) |
| 32 | 7276 | return 0; | |
| 33 | 6 | version = AV_RL16(p->buf + 22); | |
| 34 | 6 | check = AV_RL16(p->buf + 24); | |
| 35 |
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6 | if (~version + 0x1234 != check) |
| 36 | ✗ | return 10; | |
| 37 | |||
| 38 | 6 | return AVPROBE_SCORE_MAX; | |
| 39 | } | ||
| 40 | |||
| 41 | 6 | static int voc_read_header(AVFormatContext *s) | |
| 42 | { | ||
| 43 | 6 | VocDecContext *voc = s->priv_data; | |
| 44 | 6 | AVIOContext *pb = s->pb; | |
| 45 | int header_size; | ||
| 46 | |||
| 47 | 6 | avio_skip(pb, 20); | |
| 48 | 6 | header_size = avio_rl16(pb) - 22; | |
| 49 |
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6 | if (header_size != 4) { |
| 50 | ✗ | av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size); | |
| 51 | ✗ | return AVERROR(ENOSYS); | |
| 52 | } | ||
| 53 | 6 | avio_skip(pb, header_size); | |
| 54 | |||
| 55 | 6 | s->ctx_flags |= AVFMTCTX_NOHEADER; | |
| 56 | |||
| 57 | 6 | voc->remaining_size = 0; | |
| 58 | 6 | return 0; | |
| 59 | } | ||
| 60 | |||
| 61 | 228 | static int voc_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 62 | { | ||
| 63 |
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228 | if (!s->nb_streams) { |
| 64 | 6 | AVStream *st = avformat_new_stream(s, NULL); | |
| 65 |
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6 | if (!st) |
| 66 | ✗ | return AVERROR(ENOMEM); | |
| 67 | 6 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 68 | } | ||
| 69 | 228 | return ff_voc_get_packet(s, pkt, s->streams[0], 0); | |
| 70 | } | ||
| 71 | |||
| 72 | 33 | static int voc_read_seek(AVFormatContext *s, int stream_index, | |
| 73 | int64_t timestamp, int flags) | ||
| 74 | { | ||
| 75 | 33 | VocDecContext *voc = s->priv_data; | |
| 76 | AVStream *st; | ||
| 77 | FFStream *sti; | ||
| 78 | int index; | ||
| 79 | |||
| 80 |
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33 | if (s->nb_streams < 1) { |
| 81 | ✗ | av_log(s, AV_LOG_ERROR, "cannot seek while no stream was found yet\n"); | |
| 82 | ✗ | return AVERROR(EINVAL); | |
| 83 | } | ||
| 84 | |||
| 85 | 33 | st = s->streams[stream_index]; | |
| 86 | 33 | sti = ffstream(st); | |
| 87 | 33 | index = av_index_search_timestamp(st, timestamp, flags); | |
| 88 | |||
| 89 |
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33 | if (index >= 0 && index < sti->nb_index_entries - 1) { |
| 90 | 10 | const AVIndexEntry *const e = &sti->index_entries[index]; | |
| 91 | 10 | avio_seek(s->pb, e->pos, SEEK_SET); | |
| 92 | 10 | voc->pts = e->timestamp; | |
| 93 | 10 | voc->remaining_size = e->size; | |
| 94 | 10 | return 0; | |
| 95 |
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23 | } else if (sti->nb_index_entries && sti->index_entries[0].timestamp <= timestamp) { |
| 96 | 19 | const AVIndexEntry *const e = &sti->index_entries[sti->nb_index_entries - 1]; | |
| 97 | // prepare context for seek_frame_generic() | ||
| 98 | 19 | voc->pts = e->timestamp; | |
| 99 | 19 | voc->remaining_size = e->size; | |
| 100 | } | ||
| 101 | 23 | return -1; | |
| 102 | } | ||
| 103 | |||
| 104 | const FFInputFormat ff_voc_demuxer = { | ||
| 105 | .p.name = "voc", | ||
| 106 | .p.long_name = NULL_IF_CONFIG_SMALL("Creative Voice"), | ||
| 107 | .p.codec_tag = ff_voc_codec_tags_list, | ||
| 108 | .priv_data_size = sizeof(VocDecContext), | ||
| 109 | .read_probe = voc_probe, | ||
| 110 | .read_header = voc_read_header, | ||
| 111 | .read_packet = voc_read_packet, | ||
| 112 | .read_seek = voc_read_seek, | ||
| 113 | }; | ||
| 114 |