| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * CD Graphics Demuxer | ||
| 3 | * Copyright (c) 2009 Michael Tison | ||
| 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 "avformat.h" | ||
| 23 | #include "demux.h" | ||
| 24 | #include "internal.h" | ||
| 25 | |||
| 26 | #define CDG_PACKET_SIZE 24 | ||
| 27 | #define CDG_COMMAND 0x09 | ||
| 28 | #define CDG_MASK 0x3F | ||
| 29 | |||
| 30 | 7186 | static int read_probe(const AVProbeData *p) | |
| 31 | { | ||
| 32 | 7186 | const int cnt = p->buf_size / CDG_PACKET_SIZE; | |
| 33 | 7186 | int score = 0; | |
| 34 | |||
| 35 |
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86199 | for (int i = 0; i < cnt; i++) { |
| 36 | 86180 | const int x = p->buf[i * CDG_PACKET_SIZE] & CDG_MASK; | |
| 37 | |||
| 38 | 86180 | score += x == CDG_COMMAND; | |
| 39 |
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86180 | if (x != CDG_COMMAND && x != 0) |
| 40 | 7167 | return 0; | |
| 41 | } | ||
| 42 | |||
| 43 | 19 | return FFMIN(score, AVPROBE_SCORE_MAX); | |
| 44 | } | ||
| 45 | |||
| 46 | 1 | static int read_header(AVFormatContext *s) | |
| 47 | { | ||
| 48 | AVStream *vst; | ||
| 49 | int64_t ret; | ||
| 50 | |||
| 51 | 1 | vst = avformat_new_stream(s, NULL); | |
| 52 |
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1 | if (!vst) |
| 53 | ✗ | return AVERROR(ENOMEM); | |
| 54 | |||
| 55 | 1 | vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 56 | 1 | vst->codecpar->codec_id = AV_CODEC_ID_CDGRAPHICS; | |
| 57 | |||
| 58 | /// 75 sectors/sec * 4 packets/sector = 300 packets/sec | ||
| 59 | 1 | avpriv_set_pts_info(vst, 32, 1, 300); | |
| 60 | |||
| 61 | 1 | ret = avio_size(s->pb); | |
| 62 |
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1 | if (ret < 0) { |
| 63 | ✗ | av_log(s, AV_LOG_WARNING, "Cannot calculate duration as file size cannot be determined\n"); | |
| 64 | } else | ||
| 65 | 1 | vst->duration = (ret * (int64_t)vst->time_base.den) / (CDG_PACKET_SIZE * 300); | |
| 66 | |||
| 67 | 1 | return 0; | |
| 68 | } | ||
| 69 | |||
| 70 | 324 | static int read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 71 | { | ||
| 72 | int ret; | ||
| 73 | |||
| 74 | 324 | ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE); | |
| 75 | 324 | pkt->stream_index = 0; | |
| 76 | 324 | pkt->dts= | |
| 77 | 324 | pkt->pts= pkt->pos / CDG_PACKET_SIZE; | |
| 78 | |||
| 79 |
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324 | if (!pkt->pos || (ret > 5 && |
| 80 |
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323 | (pkt->data[0] & CDG_MASK) == CDG_COMMAND && |
| 81 |
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227 | (pkt->data[1] & CDG_MASK) == 1 && !(pkt->data[2+2+1] & 0x0F))) { |
| 82 | 2 | pkt->flags = AV_PKT_FLAG_KEY; | |
| 83 | } | ||
| 84 | 324 | return ret; | |
| 85 | } | ||
| 86 | |||
| 87 | const FFInputFormat ff_cdg_demuxer = { | ||
| 88 | .p.name = "cdg", | ||
| 89 | .p.long_name = NULL_IF_CONFIG_SMALL("CD Graphics"), | ||
| 90 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 91 | .p.extensions = "cdg", | ||
| 92 | .read_probe = read_probe, | ||
| 93 | .read_header = read_header, | ||
| 94 | .read_packet = read_packet, | ||
| 95 | }; | ||
| 96 |