mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Zane van Iperen <zane@zanevaniperen.com> Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>pull/334/head
Zane van Iperen
5 years ago
committed by
Michael Niedermayer
parent
d90413e1e5
commit
608b8a8c82
5 changed files with 151 additions and 2 deletions
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/*
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* LEGO Racers ALP (.tun & .pcm) 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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#include "libavutil/internal.h" |
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#define ALP_TAG MKTAG('A', 'L', 'P', ' ') |
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#define ALP_MAX_READ_SIZE 4096 |
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typedef struct ALPHeader { |
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uint32_t magic; /*< Magic Number, {'A', 'L', 'P', ' '} */ |
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uint32_t header_size; /*< Header size (after this). */ |
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char adpcm[6]; /*< "ADPCM" */ |
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uint8_t unk1; /*< Unknown */ |
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uint8_t num_channels; /*< Channel Count. */ |
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uint32_t sample_rate; /*< Sample rate, only if header_size >= 12. */ |
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} ALPHeader; |
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static int alp_probe(const AVProbeData *p) |
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{ |
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uint32_t i; |
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if (AV_RL32(p->buf) != ALP_TAG) |
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return 0; |
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/* Only allowed header sizes are 8 and 12. */ |
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i = AV_RL32(p->buf + 4); |
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if (i != 8 && i != 12) |
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return 0; |
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if (strncmp("ADPCM", p->buf + 8, 6) != 0) |
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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 alp_read_header(AVFormatContext *s) |
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{ |
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int ret; |
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AVStream *st; |
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ALPHeader hdr; |
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AVCodecParameters *par; |
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if ((hdr.magic = avio_rl32(s->pb)) != ALP_TAG) |
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return AVERROR_INVALIDDATA; |
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hdr.header_size = avio_rl32(s->pb); |
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if (hdr.header_size != 8 && hdr.header_size != 12) { |
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return AVERROR_INVALIDDATA; |
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} |
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if ((ret = avio_read(s->pb, hdr.adpcm, sizeof(hdr.adpcm))) < 0) |
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return ret; |
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else if (ret != sizeof(hdr.adpcm)) |
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return AVERROR(EIO); |
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if (strncmp("ADPCM", hdr.adpcm, sizeof(hdr.adpcm)) != 0) |
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return AVERROR_INVALIDDATA; |
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hdr.unk1 = avio_r8(s->pb); |
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hdr.num_channels = avio_r8(s->pb); |
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if (hdr.header_size == 8) { |
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/* .TUN music file */ |
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hdr.sample_rate = 11025 * hdr.num_channels; |
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} else { |
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/* .PCM sound file */ |
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hdr.sample_rate = avio_rl32(s->pb); |
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} |
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if (hdr.sample_rate > 44100) { |
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avpriv_request_sample(s, "Sample Rate > 44100"); |
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return AVERROR_PATCHWELCOME; |
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} |
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if (!(st = avformat_new_stream(s, NULL))) |
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return AVERROR(ENOMEM); |
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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_ALP; |
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par->format = AV_SAMPLE_FMT_S16; |
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par->sample_rate = hdr.sample_rate; |
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par->channels = hdr.num_channels; |
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if (hdr.num_channels == 1) |
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par->channel_layout = AV_CH_LAYOUT_MONO; |
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else if (hdr.num_channels == 2) |
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par->channel_layout = AV_CH_LAYOUT_STEREO; |
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else |
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return AVERROR_INVALIDDATA; |
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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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return 0; |
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} |
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static int alp_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, ALP_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 * 2 / par->channels; |
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return 0; |
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} |
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AVInputFormat ff_alp_demuxer = { |
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.name = "alp", |
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.long_name = NULL_IF_CONFIG_SMALL("LEGO Racers ALP"), |
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.read_probe = alp_probe, |
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.read_header = alp_read_header, |
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.read_packet = alp_read_packet |
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}; |
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