mirror of
https://github.com/FFmpeg/FFmpeg.git
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189 lines
5.9 KiB
C
189 lines
5.9 KiB
C
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/*
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* Rayman 2 APM 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 "riff.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#define APM_FILE_HEADER_SIZE 20
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#define APM_VS12_CHUNK_SIZE 76
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#define APM_MAX_READ_SIZE 4096
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#define APM_TAG_VS12 MKTAG('v', 's', '1', '2')
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#define APM_TAG_DATA MKTAG('D', 'A', 'T', 'A')
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typedef struct APMState {
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int32_t has_saved;
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int32_t predictor_r;
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int32_t step_index_r;
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int32_t saved_r;
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int32_t predictor_l;
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int32_t step_index_l;
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int32_t saved_l;
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} APMState;
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typedef struct APMVS12Chunk {
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uint32_t magic;
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uint32_t file_size;
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uint32_t data_size;
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uint32_t unk1;
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uint32_t unk2;
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APMState state;
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uint32_t pad[7];
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} APMVS12Chunk;
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static void apm_parse_vs12(APMVS12Chunk *vs12, const uint8_t *buf)
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{
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vs12->magic = AV_RL32(buf + 0);
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vs12->file_size = AV_RL32(buf + 4);
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vs12->data_size = AV_RL32(buf + 8);
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vs12->unk1 = AV_RL32(buf + 12);
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vs12->unk2 = AV_RL32(buf + 16);
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vs12->state.has_saved = AV_RL32(buf + 20);
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vs12->state.predictor_r = AV_RL32(buf + 24);
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vs12->state.step_index_r = AV_RL32(buf + 28);
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vs12->state.saved_r = AV_RL32(buf + 32);
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vs12->state.predictor_l = AV_RL32(buf + 36);
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vs12->state.step_index_l = AV_RL32(buf + 40);
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vs12->state.saved_l = AV_RL32(buf + 44);
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for (int i = 0; i < FF_ARRAY_ELEMS(vs12->pad); i++)
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vs12->pad[i] = AV_RL32(buf + 48 + (i * 4));
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}
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static int apm_probe(const AVProbeData *p)
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{
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if (p->buf_size < 100)
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return 0;
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if (AV_RL32(p->buf + 20) != APM_TAG_VS12)
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return 0;
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if (AV_RL32(p->buf + 96) != APM_TAG_DATA)
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return 0;
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return AVPROBE_SCORE_MAX - 1;
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}
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static int apm_read_header(AVFormatContext *s)
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{
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int64_t ret;
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AVStream *st;
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APMVS12Chunk vs12;
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uint8_t buf[APM_VS12_CHUNK_SIZE];
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if (!(st = avformat_new_stream(s, NULL)))
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return AVERROR(ENOMEM);
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/* The header starts with a WAVEFORMATEX */
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if ((ret = ff_get_wav_header(s, s->pb, st->codecpar, APM_FILE_HEADER_SIZE, 0)) < 0)
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return ret;
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if (st->codecpar->bits_per_coded_sample != 4)
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return AVERROR_INVALIDDATA;
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if (st->codecpar->codec_tag != 0x2000)
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return AVERROR_INVALIDDATA;
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/* ff_get_wav_header() does most of the work, but we need to fix a few things. */
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st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_APM;
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st->codecpar->codec_tag = 0;
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if (st->codecpar->channels == 2)
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st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
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else if (st->codecpar->channels == 1)
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st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
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else
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return AVERROR_INVALIDDATA;
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st->codecpar->format = AV_SAMPLE_FMT_S16;
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st->codecpar->bits_per_raw_sample = 16;
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st->codecpar->bit_rate = st->codecpar->channels *
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st->codecpar->sample_rate *
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st->codecpar->bits_per_coded_sample;
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if ((ret = avio_read(s->pb, buf, APM_VS12_CHUNK_SIZE)) < 0)
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return ret;
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else if (ret != APM_VS12_CHUNK_SIZE)
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return AVERROR(EIO);
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apm_parse_vs12(&vs12, buf);
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if (vs12.magic != APM_TAG_VS12) {
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return AVERROR_INVALIDDATA;
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}
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if (vs12.state.has_saved) {
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avpriv_request_sample(s, "Saved Samples");
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return AVERROR_PATCHWELCOME;
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}
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if (avio_rl32(s->pb) != APM_TAG_DATA)
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return AVERROR_INVALIDDATA;
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if ((ret = ff_alloc_extradata(st->codecpar, 16)) < 0)
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return ret;
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AV_WL32(st->codecpar->extradata + 0, vs12.state.predictor_l);
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AV_WL32(st->codecpar->extradata + 4, vs12.state.step_index_l);
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AV_WL32(st->codecpar->extradata + 8, vs12.state.predictor_r);
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AV_WL32(st->codecpar->extradata + 12, vs12.state.step_index_r);
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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st->start_time = 0;
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st->duration = vs12.data_size *
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(8 / st->codecpar->bits_per_coded_sample) /
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st->codecpar->channels;
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return 0;
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}
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static int apm_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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/*
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* For future reference: if files with the `has_saved` field set ever
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* surface, `saved_l`, and `saved_r` will each contain 8 "saved" samples
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* that should be sent to the decoder before the actual data.
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*/
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if ((ret = av_get_packet(s->pb, pkt, APM_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_apm_demuxer = {
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.name = "apm",
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.long_name = NULL_IF_CONFIG_SMALL("Ubisoft Rayman 2 APM"),
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.read_probe = apm_probe,
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.read_header = apm_read_header,
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.read_packet = apm_read_packet
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};
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