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117 lines
3.6 KiB
117 lines
3.6 KiB
/* |
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* Simon & Schuster Interactive VAG demuxer |
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* |
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* Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com) |
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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 "avformat.h" |
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#include "internal.h" |
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#include "libavutil/intreadwrite.h" |
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#define KVAG_TAG MKTAG('K', 'V', 'A', 'G') |
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#define KVAG_HEADER_SIZE 14 |
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#define KVAG_MAX_READ_SIZE 4096 |
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typedef struct KVAGHeader { |
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uint32_t magic; |
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uint32_t data_size; |
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uint32_t sample_rate; |
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uint16_t stereo; |
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} KVAGHeader; |
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static int kvag_probe(const AVProbeData *p) |
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{ |
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if (AV_RL32(p->buf) != KVAG_TAG) |
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return 0; |
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return AVPROBE_SCORE_EXTENSION + 1; |
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} |
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static int kvag_read_header(AVFormatContext *s) |
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{ |
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int ret; |
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AVStream *st; |
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KVAGHeader hdr; |
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AVCodecParameters *par; |
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uint8_t buf[KVAG_HEADER_SIZE]; |
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if (!(st = avformat_new_stream(s, NULL))) |
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return AVERROR(ENOMEM); |
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if ((ret = avio_read(s->pb, buf, KVAG_HEADER_SIZE)) < 0) |
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return ret; |
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else if (ret != KVAG_HEADER_SIZE) |
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return AVERROR(EIO); |
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hdr.magic = AV_RL32(buf + 0); |
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hdr.data_size = AV_RL32(buf + 4); |
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hdr.sample_rate = AV_RL32(buf + 8); |
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hdr.stereo = AV_RL16(buf + 12); |
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par = st->codecpar; |
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par->codec_type = AVMEDIA_TYPE_AUDIO; |
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par->codec_id = AV_CODEC_ID_ADPCM_IMA_SSI; |
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par->format = AV_SAMPLE_FMT_S16; |
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if (hdr.stereo) { |
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par->channel_layout = AV_CH_LAYOUT_STEREO; |
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par->channels = 2; |
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} else { |
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par->channel_layout = AV_CH_LAYOUT_MONO; |
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par->channels = 1; |
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} |
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par->sample_rate = hdr.sample_rate; |
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par->bits_per_coded_sample = 4; |
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par->bits_per_raw_sample = 16; |
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par->block_align = 1; |
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par->bit_rate = par->channels * |
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par->sample_rate * |
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par->bits_per_coded_sample; |
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avpriv_set_pts_info(st, 64, 1, par->sample_rate); |
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st->start_time = 0; |
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st->duration = hdr.data_size * |
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(8 / par->bits_per_coded_sample) / |
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par->channels; |
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return 0; |
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} |
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static int kvag_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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int ret; |
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AVCodecParameters *par = s->streams[0]->codecpar; |
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if ((ret = av_get_packet(s->pb, pkt, KVAG_MAX_READ_SIZE)) < 0) |
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return ret; |
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT; |
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pkt->stream_index = 0; |
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pkt->duration = ret * (8 / par->bits_per_coded_sample) / par->channels; |
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return 0; |
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} |
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AVInputFormat ff_kvag_demuxer = { |
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.name = "kvag", |
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.long_name = NULL_IF_CONFIG_SMALL("Simon & Schuster Interactive VAG"), |
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.read_probe = kvag_probe, |
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.read_header = kvag_read_header, |
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.read_packet = kvag_read_packet |
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};
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