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ffmpeg/libavformat/omadec.c

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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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