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FFmpeg/libavformat/scd.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* Square Enix SCD demuxer
* Copyright (C) 2021 Zane van Iperen (zane@zanevaniperen.com)
*
* Based off documentation:
* http://ffxivexplorer.fragmenterworks.com/research/scd%20files.txt
*
* 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 <stddef.h>
#include "libavutil/intreadwrite.h"
#include "libavutil/internal.h"
#include "libavutil/macros.h"
#include "libavutil/mem.h"
#include "libavformat/internal.h"
#include "avformat.h"
#include "demux.h"
#define SCD_MAGIC ((uint64_t)MKBETAG('S', 'E', 'D', 'B') << 32 | \
MKBETAG('S', 'S', 'C', 'F'))
#define SCD_MIN_HEADER_SIZE 20
#define SCD_OFFSET_HEADER_SIZE 28
#define SCD_TRACK_HEADER_SIZE 32
#define SCD_TRACK_ID_PCM 0
#define SCD_TRACK_ID_OGG 6
#define SCD_TRACK_ID_MP3 7
#define SCD_TRACK_ID_MS_ADPCM 12
typedef struct SCDOffsetTable {
uint16_t count;
uint32_t offset;
uint32_t *entries;
} SCDOffsetTable;
typedef struct SCDHeader {
uint64_t magic; /* SEDBSSCF */
uint32_t version; /* Verison number. We only know about 3. */
uint16_t unk1; /* Unknown, 260 in Drakengard 3, 1024 in FFXIV. */
uint16_t header_size; /* Total size of this header. */
uint32_t file_size; /* Is often 0, just ignore it. */
SCDOffsetTable table0; /* Table 0, no idea. 56 uint32's/entry. */
SCDOffsetTable table1; /* Table 1, contains the track info. */
SCDOffsetTable table2; /* Table 2, no idea. 40 uint32's/entry. */
uint16_t unk2; /* Unknown, not a count. */
uint32_t unk3; /* Unknown, not an offset. */
uint32_t unk4; /* Unknown, offset to offset. */
} SCDHeader;
typedef struct SCDTrackHeader {
uint32_t length;
uint32_t num_channels;
uint32_t sample_rate;
uint32_t data_type;
uint32_t loop_start;
uint32_t loop_end;
uint32_t data_offset; /* Offset to data + this header. */
uint32_t aux_count;
uint32_t absolute_offset;
uint32_t bytes_read;
} SCDTrackHeader;
typedef struct SCDDemuxContext {
SCDHeader hdr;
SCDTrackHeader *tracks;
int current_track;
} SCDDemuxContext;
static int scd_probe(const AVProbeData *p)
{
if (AV_RB64(p->buf) != SCD_MAGIC)
return 0;
return AVPROBE_SCORE_MAX;
}
static int scd_read_table(AVFormatContext *s, SCDOffsetTable *table)
{
int64_t ret;
if ((ret = avio_seek(s->pb, table->offset, SEEK_SET)) < 0)
return ret;
if ((table->entries = av_calloc(table->count, sizeof(uint32_t))) == NULL)
return ret;
if ((ret = avio_read(s->pb, (unsigned char*)table->entries, table->count * sizeof(uint32_t))) < 0)
return ret;
for (size_t i = 0; i < table->count; i++)
table->entries[i] = AV_RB32(table->entries + i);
av_log(s, AV_LOG_TRACE, "Table, size = %u, offset = %u\n", table->count, table->offset);
for (size_t i = 0; i < table->count; i++)
av_log(s, AV_LOG_TRACE, " [%02zu]: %u\n", i, table->entries[i]);
return 0;
}
static int scd_read_offsets(AVFormatContext *s)
{
int64_t ret;
SCDDemuxContext *ctx = s->priv_data;
uint8_t buf[SCD_OFFSET_HEADER_SIZE];
if ((ret = avio_read(s->pb, buf, SCD_OFFSET_HEADER_SIZE)) < 0)
return ret;
ctx->hdr.table0.count = AV_RB16(buf + 0);
ctx->hdr.table1.count = AV_RB16(buf + 2);
ctx->hdr.table2.count = AV_RB16(buf + 4);
ctx->hdr.unk2 = AV_RB16(buf + 6);
ctx->hdr.table0.offset = AV_RB32(buf + 8);
ctx->hdr.table1.offset = AV_RB32(buf + 12);
ctx->hdr.table2.offset = AV_RB32(buf + 16);
ctx->hdr.unk3 = AV_RB32(buf + 20);
ctx->hdr.unk4 = AV_RB32(buf + 24);
if ((ret = scd_read_table(s, &ctx->hdr.table0)) < 0)
return ret;
if ((ret = scd_read_table(s, &ctx->hdr.table1)) < 0)
return ret;
if ((ret = scd_read_table(s, &ctx->hdr.table2)) < 0)
return ret;
return 0;
}
static int scd_read_track(AVFormatContext *s, SCDTrackHeader *track, int index)
{
int64_t ret;
uint32_t hoffset;
AVStream *st;
AVCodecParameters *par;
SCDDemuxContext *ctx = s->priv_data;
uint8_t buf[SCD_TRACK_HEADER_SIZE];
/* Mark as experimental until I find more files from more than just one game. */
if (s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
av_log(s, AV_LOG_ERROR, "SCD demuxing is experimental, "
"add '-strict %d' if you want to use it.\n",
FF_COMPLIANCE_EXPERIMENTAL);
return AVERROR_EXPERIMENTAL;
}
hoffset = ctx->hdr.table1.entries[index];
if ((ret = avio_seek(s->pb, hoffset, SEEK_SET)) < 0)
return ret;
if ((ret = avio_read(s->pb, buf, SCD_TRACK_HEADER_SIZE)) < 0)
return ret;
track->length = AV_RB32(buf + 0);
track->num_channels = AV_RB32(buf + 4);
track->sample_rate = AV_RB32(buf + 8);
track->data_type = AV_RB32(buf + 12);
track->loop_start = AV_RB32(buf + 16);
track->loop_end = AV_RB32(buf + 20);
track->data_offset = AV_RB32(buf + 24);
track->aux_count = AV_RB32(buf + 28);
/* Sanity checks */
if (track->num_channels > 8 || track->sample_rate >= 192000 ||
track->loop_start > track->loop_end)
return AVERROR_INVALIDDATA;
track->absolute_offset = hoffset + SCD_TRACK_HEADER_SIZE + track->data_offset;
track->bytes_read = 0;
/* Not sure what to do with these, it seems to be fine to ignore them. */
if (track->aux_count != 0)
av_log(s, AV_LOG_DEBUG, "[%d] Track has %u auxiliary chunk(s).\n", index, track->aux_count);
if ((st = avformat_new_stream(s, NULL)) == NULL)
return AVERROR(ENOMEM);
par = st->codecpar;
par->codec_type = AVMEDIA_TYPE_AUDIO;
par->ch_layout.nb_channels = (int)track->num_channels;
par->sample_rate = (int)track->sample_rate;
st->index = index;
st->start_time = 0;
/* TODO: Check this with other types. Drakengard 3 MP3s have 47999 instead of 48000. */
if (track->data_type == SCD_TRACK_ID_MP3)
par->sample_rate += 1;
avpriv_set_pts_info(st, 64, 1, par->sample_rate);
if (av_dict_set_int(&st->metadata, "start", track->absolute_offset, 0) < 0)
return AVERROR(ENOMEM);
if (av_dict_set_int(&st->metadata, "loop_start", track->loop_start, 0) < 0)
return AVERROR(ENOMEM);
if (av_dict_set_int(&st->metadata, "loop_end", track->loop_end, 0) < 0)
return AVERROR(ENOMEM);
switch(track->data_type) {
case SCD_TRACK_ID_PCM:
par->codec_id = AV_CODEC_ID_PCM_S16BE;
par->bits_per_coded_sample = 16;
par->block_align = par->bits_per_coded_sample * par->ch_layout.nb_channels / 8;
break;
case SCD_TRACK_ID_MP3:
par->codec_id = AV_CODEC_ID_MP3;
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
break;
case SCD_TRACK_ID_OGG:
case SCD_TRACK_ID_MS_ADPCM:
default:
par->codec_id = AV_CODEC_ID_NONE;
avpriv_request_sample(s, "data type %u", track->data_type);
}
return 0;
}
static int scd_read_header(AVFormatContext *s)
{
int64_t ret;
SCDDemuxContext *ctx = s->priv_data;
uint8_t buf[SCD_MIN_HEADER_SIZE];
if ((ret = avio_read(s->pb, buf, SCD_MIN_HEADER_SIZE)) < 0)
return ret;
ctx->hdr.magic = AV_RB64(buf + 0);
ctx->hdr.version = AV_RB32(buf + 8);
ctx->hdr.unk1 = AV_RB16(buf + 12);
ctx->hdr.header_size = AV_RB16(buf + 14);
ctx->hdr.file_size = AV_RB32(buf + 16);
if (ctx->hdr.magic != SCD_MAGIC)
return AVERROR_INVALIDDATA;
if (ctx->hdr.version != 3) {
avpriv_request_sample(s, "SCD version %u", ctx->hdr.version);
return AVERROR_PATCHWELCOME;
}
if (ctx->hdr.header_size < SCD_MIN_HEADER_SIZE)
return AVERROR_INVALIDDATA;
if ((ret = avio_skip(s->pb, ctx->hdr.header_size - SCD_MIN_HEADER_SIZE)) < 0)
return ret;
if ((ret = scd_read_offsets(s)) < 0)
return ret;
ctx->tracks = av_calloc(ctx->hdr.table1.count, sizeof(SCDTrackHeader));
if (ctx->tracks == NULL)
return AVERROR(ENOMEM);
for (int i = 0; i < ctx->hdr.table1.count; i++) {
if ((ret = scd_read_track(s, ctx->tracks + i, i)) < 0)
return ret;
}
if (ctx->hdr.table1.count == 0)
return 0;
if ((ret = avio_seek(s->pb, ctx->tracks[0].absolute_offset, SEEK_SET)) < 0)
return ret;
return 0;
}
static int scd_read_packet(AVFormatContext *s, AVPacket *pkt)
{
SCDDemuxContext *ctx = s->priv_data;
AVCodecParameters *par;
/* Streams aren't interleaved, round-robin them. */
for (int i = 0; i < ctx->hdr.table1.count; i++) {
int64_t ret;
int size;
SCDTrackHeader *trk;
ctx->current_track %= ctx->hdr.table1.count;
trk = ctx->tracks + ctx->current_track;
par = s->streams[ctx->current_track]->codecpar;
if (trk->bytes_read >= trk->length)
continue;
if ((ret = avio_seek(s->pb, trk->absolute_offset + trk->bytes_read, SEEK_SET)) < 0)
return ret;
switch(trk->data_type) {
case SCD_TRACK_ID_PCM:
size = par->block_align;
break;
case SCD_TRACK_ID_MP3:
default:
size = FFMIN(trk->length - trk->bytes_read, 4096);
break;
}
ret = av_get_packet(s->pb, pkt, size);
if (ret == AVERROR_EOF) {
trk->length = trk->bytes_read;
continue;
} else if (ret < 0) {
return ret;
}
if (trk->data_type == SCD_TRACK_ID_PCM) {
pkt->pts = trk->bytes_read / (par->ch_layout.nb_channels * sizeof(uint16_t));
pkt->duration = size / (par->ch_layout.nb_channels * sizeof(int16_t));
}
trk->bytes_read += ret;
pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
pkt->stream_index = ctx->current_track;
ctx->current_track++;
return 0;
}
return AVERROR_EOF;
}
static int scd_seek(AVFormatContext *s, int stream_index,
int64_t pts, int flags)
{
SCDDemuxContext *ctx = s->priv_data;
if (pts != 0)
return AVERROR(EINVAL);
for(int i = 0; i < ctx->hdr.table1.count; ++i)
ctx->tracks[i].bytes_read = 0;
return 0;
}
static int scd_read_close(AVFormatContext *s)
{
SCDDemuxContext *ctx = s->priv_data;
av_freep(&ctx->hdr.table0.entries);
av_freep(&ctx->hdr.table1.entries);
av_freep(&ctx->hdr.table2.entries);
av_freep(&ctx->tracks);
return 0;
}
const FFInputFormat ff_scd_demuxer = {
.p.name = "scd",
.p.long_name = NULL_IF_CONFIG_SMALL("Square Enix SCD"),
.priv_data_size = sizeof(SCDDemuxContext),
.flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
.read_probe = scd_probe,
.read_header = scd_read_header,
.read_packet = scd_read_packet,
.read_seek = scd_seek,
.read_close = scd_read_close,
};
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