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ffmpeg/libavformat/omadec.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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/*
* Sony OpenMG (OMA) demuxer
*
* Copyright (c) 2008, 2013 Maxim Poliakovski
* 2008 Benjamin Larsson
* 2011 David Goldwich
*
* 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
*/
/**
* @file
* This is a demuxer for Sony OpenMG Music files
*
* Known file extensions: ".oma", "aa3"
* The format of such files consists of three parts:
* - "ea3" header carrying overall info and metadata. Except for starting with
* "ea" instead of "ID", it's an ID3v2 header.
* - "EA3" header is a Sony-specific header containing information about
* the OpenMG file: codec type (usually ATRAC, can also be MP3 or WMA),
* codec specific info (packet size, sample rate, channels and so on)
* and DRM related info (file encryption, content id).
* - Sound data organized in packets follow the EA3 header
* (can be encrypted using the Sony DRM!).
*
* Supported decoders: ATRAC3, ATRAC3+, MP3, LPCM
*/
#include <inttypes.h>
#include "libavutil/channel_layout.h"
#include "libavutil/mem.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/des.h"
#include "libavutil/mathematics.h"
#include "oma.h"
#include "pcm.h"
#include "id3v2.h"
static const uint64_t leaf_table[] = {
0xd79e8283acea4620, 0x7a9762f445afd0d8,
0x354d60a60b8c79f1, 0x584e1cde00b07aee,
0x1573cd93da7df623, 0x47f98d79620dd535
};
/** map ATRAC-X channel id to internal channel layout */
static const AVChannelLayout oma_chid_to_native_layout[7] = {
AV_CHANNEL_LAYOUT_MONO,
AV_CHANNEL_LAYOUT_STEREO,
AV_CHANNEL_LAYOUT_SURROUND,
AV_CHANNEL_LAYOUT_4POINT0,
AV_CHANNEL_LAYOUT_5POINT1_BACK,
AV_CHANNEL_LAYOUT_6POINT1_BACK,
AV_CHANNEL_LAYOUT_7POINT1
};
typedef struct OMAContext {
uint64_t content_start;
int encrypted;
uint16_t k_size;
uint16_t e_size;
uint16_t i_size;
uint16_t s_size;
uint32_t rid;
uint8_t r_val[24];
uint8_t n_val[24];
uint8_t m_val[8];
uint8_t s_val[8];
uint8_t sm_val[8];
uint8_t e_val[8];
uint8_t iv[8];
struct AVDES *av_des;
int (*read_packet)(AVFormatContext *s, AVPacket *pkt);
} OMAContext;
static int oma_read_close(AVFormatContext *s)
{
OMAContext *oc = s->priv_data;
av_freep(&oc->av_des);
return 0;
}
static void hex_log(AVFormatContext *s, int level,
const char *name, const uint8_t *value, int len)
{
char buf[33];
len = FFMIN(len, 16);
if (av_log_get_level() < level)
return;
ff_data_to_hex(buf, value, len, 1);
av_log(s, level, "%s: %s\n", name, buf);
}
static int kset(AVFormatContext *s, const uint8_t *r_val, const uint8_t *n_val,
int len)
{
OMAContext *oc = s->priv_data;
if (!r_val && !n_val)
return -1;
len = FFMIN(len, 16);
/* use first 64 bits in the third round again */
if (r_val) {
if (r_val != oc->r_val) {
memset(oc->r_val, 0, 24);
memcpy(oc->r_val, r_val, len);
}
memcpy(&oc->r_val[16], r_val, 8);
}
if (n_val) {
if (n_val != oc->n_val) {
memset(oc->n_val, 0, 24);
memcpy(oc->n_val, n_val, len);
}
memcpy(&oc->n_val[16], n_val, 8);
}
return 0;
}
#define OMA_RPROBE_M_VAL 48 + 1
static int rprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
const uint8_t *r_val)
{
OMAContext *oc = s->priv_data;
unsigned int pos;
struct AVDES *av_des;
if (!enc_header || !r_val ||
size < OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size ||
size < OMA_RPROBE_M_VAL)
return -1;
av_des = av_des_alloc();
if (!av_des)
return AVERROR(ENOMEM);
/* m_val */
av_des_init(av_des, r_val, 192, 1);
av_des_crypt(av_des, oc->m_val, &enc_header[48], 1, NULL, 1);
/* s_val */
av_des_init(av_des, oc->m_val, 64, 0);
av_des_crypt(av_des, oc->s_val, NULL, 1, NULL, 0);
/* sm_val */
pos = OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size;
av_des_init(av_des, oc->s_val, 64, 0);
av_des_mac(av_des, oc->sm_val, &enc_header[pos], (oc->i_size >> 3));
pos += oc->i_size;
av_free(av_des);
return memcmp(&enc_header[pos], oc->sm_val, 8) ? -1 : 0;
}
static int nprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
const uint8_t *n_val)
{
OMAContext *oc = s->priv_data;
uint64_t pos;
uint32_t taglen, datalen;
struct AVDES *av_des;
if (!enc_header || !n_val ||
size < OMA_ENC_HEADER_SIZE + oc->k_size + 4)
return -1;
pos = OMA_ENC_HEADER_SIZE + oc->k_size;
if (!memcmp(&enc_header[pos], "EKB ", 4))
pos += 32;
if (size < pos + 44)
return -1;
if (AV_RB32(&enc_header[pos]) != oc->rid)
av_log(s, AV_LOG_DEBUG, "Mismatching RID\n");
taglen = AV_RB32(&enc_header[pos + 32]);
datalen = AV_RB32(&enc_header[pos + 36]) >> 4;
pos += 44LL + taglen;
if (pos + (((uint64_t)datalen) << 4) > size)
return -1;
av_des = av_des_alloc();
if (!av_des)
return AVERROR(ENOMEM);
av_des_init(av_des, n_val, 192, 1);
while (datalen-- > 0) {
av_des_crypt(av_des, oc->r_val, &enc_header[pos], 2, NULL, 1);
kset(s, oc->r_val, NULL, 16);
if (!rprobe(s, enc_header, size, oc->r_val)) {
av_free(av_des);
return 0;
}
pos += 16;
}
av_free(av_des);
return -1;
}
static int decrypt_init(AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header)
{
OMAContext *oc = s->priv_data;
ID3v2ExtraMetaGEOB *geob = NULL;
uint8_t *gdata;
oc->encrypted = 1;
av_log(s, AV_LOG_INFO, "File is encrypted\n");
/* find GEOB metadata */
for (; em; em = em->next) {
if (strcmp(em->tag, "GEOB"))
continue;
geob = &em->data.geob;
if (!strcmp(geob->description, "OMG_LSI") ||
!strcmp(geob->description, "OMG_BKLSI"))
break;
}
if (!em) {
av_log(s, AV_LOG_ERROR, "No encryption header found\n");
return AVERROR_INVALIDDATA;
}
if (geob->datasize < 64) {
av_log(s, AV_LOG_ERROR,
"Invalid GEOB data size: %"PRIu32"\n", geob->datasize);
return AVERROR_INVALIDDATA;
}
gdata = geob->data;
if (AV_RB16(gdata) != 1)
av_log(s, AV_LOG_WARNING, "Unknown version in encryption header\n");
oc->k_size = AV_RB16(&gdata[2]);
oc->e_size = AV_RB16(&gdata[4]);
oc->i_size = AV_RB16(&gdata[6]);
oc->s_size = AV_RB16(&gdata[8]);
if (memcmp(&gdata[OMA_ENC_HEADER_SIZE], "KEYRING ", 12)) {
av_log(s, AV_LOG_ERROR, "Invalid encryption header\n");
return AVERROR_INVALIDDATA;
}
if (OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size + 8 > geob->datasize ||
OMA_ENC_HEADER_SIZE + 48 > geob->datasize) {
av_log(s, AV_LOG_ERROR, "Too little GEOB data\n");
return AVERROR_INVALIDDATA;
}
oc->rid = AV_RB32(&gdata[OMA_ENC_HEADER_SIZE + 28]);
av_log(s, AV_LOG_DEBUG, "RID: %.8"PRIx32"\n", oc->rid);
memcpy(oc->iv, &header[0x58], 8);
hex_log(s, AV_LOG_DEBUG, "IV", oc->iv, 8);
hex_log(s, AV_LOG_DEBUG, "CBC-MAC",
&gdata[OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size],
8);
if (s->keylen > 0) {
kset(s, s->key, s->key, s->keylen);
}
if (!memcmp(oc->r_val, (const uint8_t[8]){0}, 8) ||
rprobe(s, gdata, geob->datasize, oc->r_val) < 0 &&
nprobe(s, gdata, geob->datasize, oc->n_val) < 0) {
int i;
for (i = 0; i < FF_ARRAY_ELEMS(leaf_table); i += 2) {
uint8_t buf[16];
AV_WL64(buf, leaf_table[i]);
AV_WL64(&buf[8], leaf_table[i + 1]);
kset(s, buf, buf, 16);
if (!rprobe(s, gdata, geob->datasize, oc->r_val) ||
!nprobe(s, gdata, geob->datasize, oc->n_val))
break;
}
if (i >= FF_ARRAY_ELEMS(leaf_table)) {
av_log(s, AV_LOG_ERROR, "Invalid key\n");
return AVERROR_INVALIDDATA;
}
}
oc->av_des = av_des_alloc();
if (!oc->av_des)
return AVERROR(ENOMEM);
/* e_val */
av_des_init(oc->av_des, oc->m_val, 64, 0);
av_des_crypt(oc->av_des, oc->e_val,
&gdata[OMA_ENC_HEADER_SIZE + 40], 1, NULL, 0);
hex_log(s, AV_LOG_DEBUG, "EK", oc->e_val, 8);
/* init e_val */
av_des_init(oc->av_des, oc->e_val, 64, 1);
return 0;
}
static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
OMAContext *oc = s->priv_data;
AVStream *st = s->streams[0];
int packet_size = st->codecpar->block_align;
int byte_rate = st->codecpar->bit_rate >> 3;
int64_t pos = avio_tell(s->pb);
int ret = av_get_packet(s->pb, pkt, packet_size);
if (ret < packet_size)
pkt->flags |= AV_PKT_FLAG_CORRUPT;
if (ret < 0)
return ret;
if (!ret)
return AVERROR_EOF;
pkt->stream_index = 0;
if (pos >= oc->content_start && byte_rate > 0) {
pkt->pts =
pkt->dts = av_rescale(pos - oc->content_start, st->time_base.den,
byte_rate * (int64_t)st->time_base.num);
}
if (oc->encrypted) {
/* previous unencrypted block saved in IV for
* the next packet (CBC mode) */
if (ret == packet_size)
av_des_crypt(oc->av_des, pkt->data, pkt->data,
(packet_size >> 3), oc->iv, 1);
else
memset(oc->iv, 0, 8);
}
return ret;
}
static int aal_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int64_t pos = avio_tell(s->pb);
int ret, pts;
int packet_size;
unsigned tag;
if (avio_feof(s->pb))
return AVERROR_EOF;
tag = avio_rb24(s->pb);
if (tag == 0)
return AVERROR_EOF;
else if (tag != MKBETAG(0,'B','L','K'))
return AVERROR_INVALIDDATA;
avio_skip(s->pb, 1);
packet_size = avio_rb16(s->pb);
avio_skip(s->pb, 2);
pts = avio_rb32(s->pb);
avio_skip(s->pb, 12);
ret = av_get_packet(s->pb, pkt, packet_size);
if (ret < packet_size)
pkt->flags |= AV_PKT_FLAG_CORRUPT;
if (ret < 0)
return ret;
if (!ret)
return AVERROR_EOF;
pkt->stream_index = 0;
pkt->pos = pos;
if (s->streams[0]->codecpar->codec_id == AV_CODEC_ID_ATRAC3AL) {
pkt->duration = 1024;
pkt->pts = pts * 1024LL;
} else {
pkt->duration = 2048;
pkt->pts = pts * 2048LL;
}
return ret;
}
static int oma_read_header(AVFormatContext *s)
{
int ret, framesize, jsflag, samplerate;
uint32_t codec_params, channel_id;
int16_t eid;
uint8_t buf[EA3_HEADER_SIZE];
uint8_t *edata;
AVStream *st;
ID3v2ExtraMeta *extra_meta;
OMAContext *oc = s->priv_data;
ff_id3v2_read(s, ID3v2_EA3_MAGIC, &extra_meta, 0);
if ((ret = ff_id3v2_parse_chapters(s, extra_meta)) < 0) {
ff_id3v2_free_extra_meta(&extra_meta);
return ret;
}
ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
if (ret < EA3_HEADER_SIZE) {
ff_id3v2_free_extra_meta(&extra_meta);
return -1;
}
if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}), 3) ||
buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
ff_id3v2_free_extra_meta(&extra_meta);
av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
return AVERROR_INVALIDDATA;
}
oc->content_start = avio_tell(s->pb);
/* encrypted file */
eid = AV_RB16(&buf[6]);
if (eid != -1 && eid != -128 && decrypt_init(s, extra_meta, buf) < 0) {
ff_id3v2_free_extra_meta(&extra_meta);
return -1;
}
ff_id3v2_free_extra_meta(&extra_meta);
codec_params = AV_RB24(&buf[33]);
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->start_time = 0;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_tag = buf[32];
st->codecpar->codec_id = ff_codec_get_id(ff_oma_codec_tags,
st->codecpar->codec_tag);
oc->read_packet = read_packet;
switch (buf[32]) {
case OMA_CODECID_ATRAC3:
samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
if (!samplerate) {
av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
return AVERROR_INVALIDDATA;
}
if (samplerate != 44100)
avpriv_request_sample(s, "Sample rate %d", samplerate);
framesize = (codec_params & 0x3FF) * 8;
/* get stereo coding mode, 1 for joint-stereo */
jsflag = (codec_params >> 17) & 1;
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
st->codecpar->sample_rate = samplerate;
st->codecpar->bit_rate = st->codecpar->sample_rate * framesize / (1024 / 8);
/* fake the ATRAC3 extradata
* (wav format, makes stream copy to wav work) */
if ((ret = ff_alloc_extradata(st->codecpar, 14)) < 0)
return ret;
edata = st->codecpar->extradata;
AV_WL16(&edata[0], 1); // always 1
AV_WL32(&edata[2], samplerate); // samples rate
AV_WL16(&edata[6], jsflag); // coding mode
AV_WL16(&edata[8], jsflag); // coding mode
AV_WL16(&edata[10], 1); // always 1
AV_WL16(&edata[12], 0); // always 0
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
break;
case OMA_CODECID_ATRAC3P:
channel_id = (codec_params >> 10) & 7;
if (!channel_id) {
av_log(s, AV_LOG_ERROR,
"Invalid ATRAC-X channel id: %"PRIu32"\n", channel_id);
return AVERROR_INVALIDDATA;
}
av_channel_layout_copy(&st->codecpar->ch_layout,
&oma_chid_to_native_layout[channel_id - 1]);
framesize = ((codec_params & 0x3FF) * 8) + 8;
samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
if (!samplerate) {
av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
return AVERROR_INVALIDDATA;
}
st->codecpar->sample_rate = samplerate;
st->codecpar->bit_rate = samplerate * framesize / (2048 / 8);
avpriv_set_pts_info(st, 64, 1, samplerate);
break;
case OMA_CODECID_MP3:
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
framesize = 1024;
break;
case OMA_CODECID_LPCM:
/* PCM 44.1 kHz 16 bit stereo big-endian */
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
st->codecpar->sample_rate = 44100;
framesize = 1024;
/* bit rate = sample rate x PCM block align (= 4) x 8 */
st->codecpar->bit_rate = st->codecpar->sample_rate * 32;
st->codecpar->bits_per_coded_sample =
av_get_bits_per_sample(st->codecpar->codec_id);
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
break;
case OMA_CODECID_ATRAC3AL:
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
st->codecpar->sample_rate = 44100;
avpriv_set_pts_info(st, 64, 1, 44100);
oc->read_packet = aal_read_packet;
framesize = 4096;
break;
case OMA_CODECID_ATRAC3PAL:
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
st->codecpar->sample_rate = 44100;
avpriv_set_pts_info(st, 64, 1, 44100);
oc->read_packet = aal_read_packet;
framesize = 4096;
break;
default:
av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n", buf[32]);
return AVERROR(ENOSYS);
}
st->codecpar->block_align = framesize;
return 0;
}
static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
{
OMAContext *oc = s->priv_data;
return oc->read_packet(s, pkt);
}
static int oma_read_probe(const AVProbeData *p)
{
const uint8_t *buf = p->buf;
unsigned tag_len = 0;
if (p->buf_size >= ID3v2_HEADER_SIZE && ff_id3v2_match(buf, ID3v2_EA3_MAGIC))
tag_len = ff_id3v2_tag_len(buf);
/* This check cannot overflow as tag_len has at most 28 bits */
if (p->buf_size < tag_len + 5)
/* EA3 header comes late, might be outside of the probe buffer */
return tag_len ? AVPROBE_SCORE_EXTENSION/2 : 0;
buf += tag_len;
if (!memcmp(buf, "EA3", 3) && !buf[4] && buf[5] == EA3_HEADER_SIZE)
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int oma_read_seek(struct AVFormatContext *s,
int stream_index, int64_t timestamp, int flags)
{
OMAContext *oc = s->priv_data;
AVStream *st = s->streams[0];
int64_t err;
if (st->codecpar->codec_id == AV_CODEC_ID_ATRAC3PAL ||
st->codecpar->codec_id == AV_CODEC_ID_ATRAC3AL)
return -1;
err = ff_pcm_read_seek(s, stream_index, timestamp, flags);
if (!oc->encrypted)
return err;
/* readjust IV for CBC */
if (err || avio_tell(s->pb) < oc->content_start)
goto wipe;
if ((err = avio_seek(s->pb, -8, SEEK_CUR)) < 0)
goto wipe;
if ((err = avio_read(s->pb, oc->iv, 8)) < 8) {
if (err >= 0)
err = AVERROR_EOF;
goto wipe;
}
return 0;
wipe:
memset(oc->iv, 0, 8);
return err;
}
const FFInputFormat ff_oma_demuxer = {
.p.name = "oma",
.p.long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
.p.flags = AVFMT_GENERIC_INDEX,
.p.extensions = "oma,omg,aa3",
.p.codec_tag = ff_oma_codec_tags_list,
.priv_data_size = sizeof(OMAContext),
.flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
.read_probe = oma_read_probe,
.read_header = oma_read_header,
.read_packet = oma_read_packet,
.read_seek = oma_read_seek,
.read_close = oma_read_close,
};
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