1/* 2 * Copyright (c) 2021 Paul B Mahol 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#include "libavutil/intreadwrite.h" 22#include "avformat.h" 23#include "internal.h" 24 25static int binka_probe(const AVProbeData *p) 26{ 27 if (AV_RB32(p->buf) == MKBETAG('1', 'F', 'C', 'B') && 28 (p->buf[4] == 1 || p->buf[4] == 2)) 29 return AVPROBE_SCORE_MAX; 30 return 0; 31} 32 33static int binka_read_header(AVFormatContext *s) 34{ 35 AVIOContext *pb = s->pb; 36 AVStream *st; 37 int entries, offset; 38 39 st = avformat_new_stream(s, NULL); 40 if (!st) 41 return AVERROR(ENOMEM); 42 43 avio_skip(pb, 5); 44 45 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; 46 st->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_DCT; 47 st->codecpar->ch_layout.nb_channels = avio_r8(pb); 48 st->codecpar->sample_rate = avio_rl16(pb); 49 st->duration = avio_rl32(pb); 50 51 avio_skip(pb, 8); 52 entries = avio_rl16(pb); 53 54 offset = entries * 2 + 2; 55 avio_skip(pb, offset); 56 57 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); 58 59 return 0; 60} 61 62static int binka_read_packet(AVFormatContext *s, AVPacket *pkt) 63{ 64 AVIOContext *pb = s->pb; 65 AVStream *st = s->streams[0]; 66 int64_t pos; 67 int pkt_size; 68 int ret; 69 70 if (avio_feof(pb)) 71 return AVERROR_EOF; 72 73 pos = avio_tell(pb); 74 avio_skip(pb, 2); 75 pkt_size = avio_rl16(pb) + 4; 76 if (pkt_size <= 4) 77 return AVERROR(EIO); 78 ret = av_new_packet(pkt, pkt_size); 79 if (ret < 0) 80 return ret; 81 82 avio_read(pb, pkt->data + 4, pkt_size - 4); 83 AV_WL32(pkt->data, pkt_size); 84 85 pkt->pos = pos; 86 pkt->stream_index = 0; 87 pkt->duration = av_get_audio_frame_duration2(st->codecpar, 0); 88 89 return 0; 90} 91 92const AVInputFormat ff_binka_demuxer = { 93 .name = "binka", 94 .long_name = NULL_IF_CONFIG_SMALL("Bink Audio"), 95 .read_probe = binka_probe, 96 .read_header = binka_read_header, 97 .read_packet = binka_read_packet, 98 .flags = AVFMT_GENERIC_INDEX, 99 .extensions = "binka", 100}; 101