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ffmpeg/libavformat/apm.c

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/*
* Rayman 2 APM (De)muxer
*
* 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 "config_components.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "mux.h"
#include "rawenc.h"
#include "libavutil/channel_layout.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#define APM_FILE_HEADER_SIZE 20
#define APM_FILE_EXTRADATA_SIZE 80
#define APM_EXTRADATA_SIZE 28
#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 APMExtraData {
uint32_t magic;
uint32_t file_size;
uint32_t data_size;
uint32_t unk1;
uint32_t unk2;
APMState state;
uint32_t unk3[7];
uint32_t data;
} APMExtraData;
#if CONFIG_APM_DEMUXER
static void apm_parse_extradata(APMExtraData *ext, const uint8_t *buf)
{
ext->magic = AV_RL32(buf + 0);
ext->file_size = AV_RL32(buf + 4);
ext->data_size = AV_RL32(buf + 8);
ext->unk1 = AV_RL32(buf + 12);
ext->unk2 = AV_RL32(buf + 16);
ext->state.has_saved = AV_RL32(buf + 20);
ext->state.predictor_r = AV_RL32(buf + 24);
ext->state.step_index_r = AV_RL32(buf + 28);
ext->state.saved_r = AV_RL32(buf + 32);
ext->state.predictor_l = AV_RL32(buf + 36);
ext->state.step_index_l = AV_RL32(buf + 40);
ext->state.saved_l = AV_RL32(buf + 44);
for (int i = 0; i < FF_ARRAY_ELEMS(ext->unk3); i++)
ext->unk3[i] = AV_RL32(buf + 48 + (i * 4));
ext->data = AV_RL32(buf + 76);
}
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;
APMExtraData extradata;
AVCodecParameters *par;
uint8_t buf[APM_FILE_EXTRADATA_SIZE];
int channels;
if (!(st = avformat_new_stream(s, NULL)))
return AVERROR(ENOMEM);
/*
* This is 98% a WAVEFORMATEX, but there's something screwy with the extradata
* that ff_get_wav_header() can't (and shouldn't) handle properly.
*/
if (avio_rl16(s->pb) != APM_TAG_CODEC)
return AVERROR_INVALIDDATA;
par = st->codecpar;
channels = avio_rl16(s->pb);
par->sample_rate = avio_rl32(s->pb);
/* Skip the bitrate, it's usually wrong anyway. */
if ((ret = avio_skip(s->pb, 4)) < 0)
return ret;
par->block_align = avio_rl16(s->pb);
par->bits_per_coded_sample = avio_rl16(s->pb);
if (avio_rl32(s->pb) != APM_FILE_EXTRADATA_SIZE)
return AVERROR_INVALIDDATA;
/* 8 = bits per sample * max channels */
if (par->sample_rate > (INT_MAX / 8))
return AVERROR_INVALIDDATA;
if (par->bits_per_coded_sample != 4)
return AVERROR_INVALIDDATA;
if (channels > 2 || channels == 0)
return AVERROR_INVALIDDATA;
av_channel_layout_default(&par->ch_layout, channels);
par->codec_type = AVMEDIA_TYPE_AUDIO;
par->codec_id = AV_CODEC_ID_ADPCM_IMA_APM;
par->format = AV_SAMPLE_FMT_S16;
par->bit_rate = par->ch_layout.nb_channels *
(int64_t)par->sample_rate *
par->bits_per_coded_sample;
if ((ret = avio_read(s->pb, buf, APM_FILE_EXTRADATA_SIZE)) < 0)
return ret;
else if (ret != APM_FILE_EXTRADATA_SIZE)
return AVERROR(EIO);
apm_parse_extradata(&extradata, buf);
if (extradata.magic != APM_TAG_VS12 || extradata.data != APM_TAG_DATA)
return AVERROR_INVALIDDATA;
if (extradata.state.has_saved) {
avpriv_request_sample(s, "Saved Samples");
return AVERROR_PATCHWELCOME;
}
if ((ret = ff_alloc_extradata(par, APM_EXTRADATA_SIZE)) < 0)
return ret;
/* Use the entire state as extradata. */
memcpy(par->extradata, buf + 20, APM_EXTRADATA_SIZE);
avpriv_set_pts_info(st, 64, 1, par->sample_rate);
st->start_time = 0;
st->duration = extradata.data_size *
(8 / par->bits_per_coded_sample) /
par->ch_layout.nb_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->ch_layout.nb_channels;
return 0;
}
const FFInputFormat ff_apm_demuxer = {
.p.name = "apm",
.p.long_name = NULL_IF_CONFIG_SMALL("Ubisoft Rayman 2 APM"),
.read_probe = apm_probe,
.read_header = apm_read_header,
.read_packet = apm_read_packet
};
#endif
#if CONFIG_APM_MUXER
static int apm_write_init(AVFormatContext *s)
{
AVCodecParameters *par = s->streams[0]->codecpar;
if (par->ch_layout.nb_channels > 2) {
av_log(s, AV_LOG_ERROR, "APM files only support up to 2 channels\n");
return AVERROR(EINVAL);
}
if (par->sample_rate > (INT_MAX / 8)) {
av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
return AVERROR(EINVAL);
}
if (par->extradata_size != APM_EXTRADATA_SIZE) {
av_log(s, AV_LOG_ERROR, "Invalid/missing extradata\n");
return AVERROR(EINVAL);
}
if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
av_log(s, AV_LOG_ERROR, "Stream not seekable, unable to write output file\n");
return AVERROR(EINVAL);
}
return 0;
}
static int apm_write_header(AVFormatContext *s)
{
uint8_t buf[APM_FILE_EXTRADATA_SIZE] = { 0 };
AVCodecParameters *par = s->streams[0]->codecpar;
/*
* Bodge a WAVEFORMATEX manually, ff_put_wav_header() can't
* be used because of the extra 2 bytes.
*/
avio_wl16(s->pb, APM_TAG_CODEC);
avio_wl16(s->pb, par->ch_layout.nb_channels);
avio_wl32(s->pb, par->sample_rate);
/* This is the wrong calculation, but it's what the orginal files have. */
avio_wl32(s->pb, par->sample_rate * par->ch_layout.nb_channels * 2);
avio_wl16(s->pb, par->block_align);
avio_wl16(s->pb, par->bits_per_coded_sample);
avio_wl32(s->pb, APM_FILE_EXTRADATA_SIZE);
/*
* Build the extradata. Assume the codec's given us correct data.
* File and data sizes are fixed later.
*/
AV_WL32(buf + 0, APM_TAG_VS12); /* magic */
AV_WL32(buf + 12, 0xFFFFFFFF); /* unk1 */
memcpy( buf + 20, par->extradata, APM_EXTRADATA_SIZE);
AV_WL32(buf + 76, APM_TAG_DATA); /* data */
avio_write(s->pb, buf, APM_FILE_EXTRADATA_SIZE);
return 0;
}
static int apm_write_trailer(AVFormatContext *s)
{
int64_t file_size, data_size;
file_size = avio_tell(s->pb);
data_size = file_size - (APM_FILE_HEADER_SIZE + APM_FILE_EXTRADATA_SIZE);
if (file_size >= UINT32_MAX) {
av_log(s, AV_LOG_ERROR,
"Filesize %"PRId64" invalid for APM, output file will be broken\n",
file_size);
return AVERROR(ERANGE);
}
avio_seek(s->pb, 24, SEEK_SET);
avio_wl32(s->pb, (uint32_t)file_size);
avio_wl32(s->pb, (uint32_t)data_size);
return 0;
}
const FFOutputFormat ff_apm_muxer = {
.p.name = "apm",
.p.long_name = NULL_IF_CONFIG_SMALL("Ubisoft Rayman 2 APM"),
.p.extensions = "apm",
.p.audio_codec = AV_CODEC_ID_ADPCM_IMA_APM,
.p.video_codec = AV_CODEC_ID_NONE,
.p.subtitle_codec = AV_CODEC_ID_NONE,
.flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH |
FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
.init = apm_write_init,
.write_header = apm_write_header,
.write_packet = ff_raw_write_packet,
.write_trailer = apm_write_trailer
};
#endif
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