192 lines
6 KiB
C
Executable file
192 lines
6 KiB
C
Executable file
/*
|
|
* Rayman 2 APM Demuxer
|
|
*
|
|
* Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "riff.h"
|
|
#include "libavutil/internal.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
|
|
#define APM_FILE_HEADER_SIZE 20
|
|
#define APM_VS12_CHUNK_SIZE 76
|
|
#define APM_MAX_READ_SIZE 4096
|
|
|
|
#define APM_TAG_CODEC 0x2000
|
|
#define APM_TAG_VS12 MKTAG('v', 's', '1', '2')
|
|
#define APM_TAG_DATA MKTAG('D', 'A', 'T', 'A')
|
|
|
|
typedef struct APMState {
|
|
int32_t has_saved;
|
|
int32_t predictor_r;
|
|
int32_t step_index_r;
|
|
int32_t saved_r;
|
|
int32_t predictor_l;
|
|
int32_t step_index_l;
|
|
int32_t saved_l;
|
|
} APMState;
|
|
|
|
typedef struct APMVS12Chunk {
|
|
uint32_t magic;
|
|
uint32_t file_size;
|
|
uint32_t data_size;
|
|
uint32_t unk1;
|
|
uint32_t unk2;
|
|
APMState state;
|
|
uint32_t pad[7];
|
|
} APMVS12Chunk;
|
|
|
|
static void apm_parse_vs12(APMVS12Chunk *vs12, const uint8_t *buf)
|
|
{
|
|
vs12->magic = AV_RL32(buf + 0);
|
|
vs12->file_size = AV_RL32(buf + 4);
|
|
vs12->data_size = AV_RL32(buf + 8);
|
|
vs12->unk1 = AV_RL32(buf + 12);
|
|
vs12->unk2 = AV_RL32(buf + 16);
|
|
|
|
vs12->state.has_saved = AV_RL32(buf + 20);
|
|
vs12->state.predictor_r = AV_RL32(buf + 24);
|
|
vs12->state.step_index_r = AV_RL32(buf + 28);
|
|
vs12->state.saved_r = AV_RL32(buf + 32);
|
|
vs12->state.predictor_l = AV_RL32(buf + 36);
|
|
vs12->state.step_index_l = AV_RL32(buf + 40);
|
|
vs12->state.saved_l = AV_RL32(buf + 44);
|
|
|
|
for (int i = 0; i < FF_ARRAY_ELEMS(vs12->pad); i++)
|
|
vs12->pad[i] = AV_RL32(buf + 48 + (i * 4));
|
|
}
|
|
|
|
static int apm_probe(const AVProbeData *p)
|
|
{
|
|
if (AV_RL16(p->buf) != APM_TAG_CODEC)
|
|
return 0;
|
|
|
|
if (p->buf_size < 100)
|
|
return 0;
|
|
|
|
if (AV_RL32(p->buf + 20) != APM_TAG_VS12)
|
|
return 0;
|
|
|
|
if (AV_RL32(p->buf + 96) != APM_TAG_DATA)
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX - 1;
|
|
}
|
|
|
|
static int apm_read_header(AVFormatContext *s)
|
|
{
|
|
int64_t ret;
|
|
AVStream *st;
|
|
APMVS12Chunk vs12;
|
|
uint8_t buf[APM_VS12_CHUNK_SIZE];
|
|
|
|
if (!(st = avformat_new_stream(s, NULL)))
|
|
return AVERROR(ENOMEM);
|
|
|
|
/* The header starts with a WAVEFORMATEX */
|
|
if ((ret = ff_get_wav_header(s, s->pb, st->codecpar, APM_FILE_HEADER_SIZE, 0)) < 0)
|
|
return ret;
|
|
|
|
if (st->codecpar->bits_per_coded_sample != 4)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (st->codecpar->codec_tag != APM_TAG_CODEC)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
/* ff_get_wav_header() does most of the work, but we need to fix a few things. */
|
|
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_APM;
|
|
st->codecpar->codec_tag = 0;
|
|
|
|
if (st->codecpar->channels == 2)
|
|
st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
|
|
else if (st->codecpar->channels == 1)
|
|
st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
|
|
else
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
st->codecpar->format = AV_SAMPLE_FMT_S16;
|
|
st->codecpar->bits_per_raw_sample = 16;
|
|
st->codecpar->bit_rate = st->codecpar->channels *
|
|
st->codecpar->sample_rate *
|
|
st->codecpar->bits_per_coded_sample;
|
|
|
|
if ((ret = avio_read(s->pb, buf, APM_VS12_CHUNK_SIZE)) < 0)
|
|
return ret;
|
|
else if (ret != APM_VS12_CHUNK_SIZE)
|
|
return AVERROR(EIO);
|
|
|
|
apm_parse_vs12(&vs12, buf);
|
|
|
|
if (vs12.magic != APM_TAG_VS12) {
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (vs12.state.has_saved) {
|
|
avpriv_request_sample(s, "Saved Samples");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
|
|
if (avio_rl32(s->pb) != APM_TAG_DATA)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if ((ret = ff_alloc_extradata(st->codecpar, 16)) < 0)
|
|
return ret;
|
|
|
|
AV_WL32(st->codecpar->extradata + 0, vs12.state.predictor_l);
|
|
AV_WL32(st->codecpar->extradata + 4, vs12.state.step_index_l);
|
|
AV_WL32(st->codecpar->extradata + 8, vs12.state.predictor_r);
|
|
AV_WL32(st->codecpar->extradata + 12, vs12.state.step_index_r);
|
|
|
|
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
|
|
st->start_time = 0;
|
|
st->duration = vs12.data_size *
|
|
(8 / st->codecpar->bits_per_coded_sample) /
|
|
st->codecpar->channels;
|
|
return 0;
|
|
}
|
|
|
|
static int apm_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int ret;
|
|
AVCodecParameters *par = s->streams[0]->codecpar;
|
|
|
|
/*
|
|
* For future reference: if files with the `has_saved` field set ever
|
|
* surface, `saved_l`, and `saved_r` will each contain 8 "saved" samples
|
|
* that should be sent to the decoder before the actual data.
|
|
*/
|
|
|
|
if ((ret = av_get_packet(s->pb, pkt, APM_MAX_READ_SIZE)) < 0)
|
|
return ret;
|
|
|
|
pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
|
|
pkt->stream_index = 0;
|
|
pkt->duration = ret * (8 / par->bits_per_coded_sample) / par->channels;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_apm_demuxer = {
|
|
.name = "apm",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Ubisoft Rayman 2 APM"),
|
|
.read_probe = apm_probe,
|
|
.read_header = apm_read_header,
|
|
.read_packet = apm_read_packet
|
|
};
|