/*
- * Sony OpenMG (OMA) demuxer
- *
- * Copyright (c) 2008 Maxim Poliakovski
- * 2008 Benjamin Larsson
- * 2011 David Goldwich
+ * Sony OpenMG (OMA) common data
*
* This file is part of Libav.
*
* 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!).
- *
- * CODEC SUPPORT: Only ATRAC3 codec is currently supported!
- */
-
-#include "avformat.h"
#include "internal.h"
-#include "libavutil/intreadwrite.h"
-#include "libavutil/des.h"
-#include "pcm.h"
-#include "riff.h"
-#include "id3v2.h"
+#include "oma.h"
+#include "libavcodec/avcodec.h"
-#define EA3_HEADER_SIZE 96
-#define ID3v2_EA3_MAGIC "ea3"
-#define OMA_ENC_HEADER_SIZE 16
+const uint16_t ff_oma_srate_tab[6] = { 320, 441, 480, 882, 960, 0 };
-enum {
- OMA_CODECID_ATRAC3 = 0,
- OMA_CODECID_ATRAC3P = 1,
- OMA_CODECID_MP3 = 3,
- OMA_CODECID_LPCM = 4,
- OMA_CODECID_WMA = 5,
+const AVCodecTag ff_oma_codec_tags[] = {
+ { AV_CODEC_ID_ATRAC3, OMA_CODECID_ATRAC3 },
+ { AV_CODEC_ID_ATRAC3P, OMA_CODECID_ATRAC3P },
+ { AV_CODEC_ID_MP3, OMA_CODECID_MP3 },
+ { AV_CODEC_ID_PCM_S16BE, OMA_CODECID_LPCM },
+ { 0 },
};
-
-static const AVCodecTag codec_oma_tags[] = {
- { CODEC_ID_ATRAC3, OMA_CODECID_ATRAC3 },
- { CODEC_ID_ATRAC3P, OMA_CODECID_ATRAC3P },
- { CODEC_ID_MP3, OMA_CODECID_MP3 },
- { CODEC_ID_PCM_S16BE, OMA_CODECID_LPCM },
-};
-
-static const uint64_t leaf_table[] = {
- 0xd79e8283acea4620, 0x7a9762f445afd0d8,
- 0x354d60a60b8c79f1, 0x584e1cde00b07aee,
- 0x1573cd93da7df623, 0x47f98d79620dd535
-};
-
-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;
-} OMAContext;
-
-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);
- buf[len<<1] = '\0';
- 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;
-}
-
-static int rprobe(AVFormatContext *s, uint8_t *enc_header, const uint8_t *r_val)
-{
- OMAContext *oc = s->priv_data;
- unsigned int pos;
- struct AVDES av_des;
-
- if (!enc_header || !r_val)
- return -1;
-
- /* 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;
-
- return memcmp(&enc_header[pos], oc->sm_val, 8) ? -1 : 0;
-}
-
-static int nprobe(AVFormatContext *s, uint8_t *enc_header, const uint8_t *n_val)
-{
- OMAContext *oc = s->priv_data;
- uint32_t pos, taglen, datalen;
- struct AVDES av_des;
-
- if (!enc_header || !n_val)
- return -1;
-
- pos = OMA_ENC_HEADER_SIZE + oc->k_size;
- if (!memcmp(&enc_header[pos], "EKB ", 4))
- pos += 32;
-
- 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 += 44 + taglen;
-
- 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, oc->r_val))
- return 0;
- pos += 16;
- }
-
- 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 */
- while (em) {
- if (!strcmp(em->tag, "GEOB") &&
- (geob = em->data) &&
- (!strcmp(geob->description, "OMG_LSI") ||
- !strcmp(geob->description, "OMG_BKLSI"))) {
- break;
- }
- em = em->next;
- }
- if (!em) {
- av_log(s, AV_LOG_ERROR, "No encryption header found\n");
- return -1;
- }
-
- if (geob->datasize < 64) {
- av_log(s, AV_LOG_ERROR, "Invalid GEOB data size: %u\n", geob->datasize);
- return -1;
- }
-
- 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 -1;
- }
- oc->rid = AV_RB32(&gdata[OMA_ENC_HEADER_SIZE + 28]);
- av_log(s, AV_LOG_DEBUG, "RID: %.8x\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, oc->r_val) < 0 &&
- nprobe(s, gdata, oc->n_val) < 0) {
- int i;
- for (i = 0; i < sizeof(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, oc->r_val) || !nprobe(s, gdata, oc->n_val))
- break;
- }
- if (i >= sizeof(leaf_table)) {
- av_log(s, AV_LOG_ERROR, "Invalid key\n");
- return -1;
- }
- }
-
- /* 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 oma_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
-{
- static const uint16_t srate_tab[6] = {320,441,480,882,960,0};
- int ret, framesize, jsflag, samplerate;
- uint32_t codec_params;
- int16_t eid;
- uint8_t buf[EA3_HEADER_SIZE];
- uint8_t *edata;
- AVStream *st;
- ID3v2ExtraMeta *extra_meta = NULL;
- OMAContext *oc = s->priv_data;
-
- ff_id3v2_read_all(s, ID3v2_EA3_MAGIC, &extra_meta);
- ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
- if (ret < EA3_HEADER_SIZE)
- return -1;
-
- if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}),3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
- av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
- return -1;
- }
-
- 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->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- st->codec->codec_tag = buf[32];
- st->codec->codec_id = ff_codec_get_id(codec_oma_tags, st->codec->codec_tag);
-
- switch (buf[32]) {
- case OMA_CODECID_ATRAC3:
- samplerate = srate_tab[(codec_params >> 13) & 7]*100;
- if (samplerate != 44100)
- av_log_ask_for_sample(s, "Unsupported sample rate: %d\n",
- samplerate);
-
- framesize = (codec_params & 0x3FF) * 8;
- jsflag = (codec_params >> 17) & 1; /* get stereo coding mode, 1 for joint-stereo */
- st->codec->channels = 2;
- st->codec->sample_rate = samplerate;
- st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024;
-
- /* fake the atrac3 extradata (wav format, makes stream copy to wav work) */
- st->codec->extradata_size = 14;
- edata = av_mallocz(14 + FF_INPUT_BUFFER_PADDING_SIZE);
- if (!edata)
- return AVERROR(ENOMEM);
-
- st->codec->extradata = edata;
- 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->codec->sample_rate);
- break;
- case OMA_CODECID_ATRAC3P:
- st->codec->channels = (codec_params >> 10) & 7;
- framesize = ((codec_params & 0x3FF) * 8) + 8;
- st->codec->sample_rate = srate_tab[(codec_params >> 13) & 7]*100;
- st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024;
- avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
- av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n");
- break;
- case OMA_CODECID_MP3:
- st->need_parsing = AVSTREAM_PARSE_FULL;
- framesize = 1024;
- break;
- case OMA_CODECID_LPCM:
- /* PCM 44.1 kHz 16 bit stereo big-endian */
- st->codec->channels = 2;
- st->codec->sample_rate = 44100;
- framesize = 1024;
- /* bit rate = sample rate x PCM block align (= 4) x 8 */
- st->codec->bit_rate = st->codec->sample_rate * 32;
- st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
- avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
- break;
- default:
- av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]);
- return -1;
- }
-
- st->codec->block_align = framesize;
-
- return 0;
-}
-
-
-static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
-{
- OMAContext *oc = s->priv_data;
- int packet_size = s->streams[0]->codec->block_align;
- int ret = av_get_packet(s->pb, pkt, packet_size);
-
- if (ret <= 0)
- return AVERROR(EIO);
-
- pkt->stream_index = 0;
-
- if (oc->encrypted) {
- /* previous unencrypted block saved in IV for the next packet (CBC mode) */
- av_des_crypt(&oc->av_des, pkt->data, pkt->data, (packet_size >> 3), oc->iv, 1);
- }
-
- return ret;
-}
-
-static int oma_read_probe(AVProbeData *p)
-{
- const uint8_t *buf;
- unsigned tag_len = 0;
-
- buf = p->buf;
-
- if (p->buf_size < ID3v2_HEADER_SIZE ||
- !ff_id3v2_match(buf, ID3v2_EA3_MAGIC) ||
- buf[3] != 3 || // version must be 3
- buf[4]) // flags byte zero
- return 0;
-
- 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 AVPROBE_SCORE_MAX / 2;
-
- 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;
-
- pcm_read_seek(s, stream_index, timestamp, flags);
-
- if (oc->encrypted) {
- /* readjust IV for CBC */
- int64_t pos = avio_tell(s->pb);
- if (pos < oc->content_start)
- memset(oc->iv, 0, 8);
- else {
- if (avio_seek(s->pb, -8, SEEK_CUR) < 0 || avio_read(s->pb, oc->iv, 8) < 8) {
- memset(oc->iv, 0, 8);
- return -1;
- }
- }
- }
-
- return 0;
-}
-
-AVInputFormat ff_oma_demuxer = {
- .name = "oma",
- .long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
- .priv_data_size = sizeof(OMAContext),
- .read_probe = oma_read_probe,
- .read_header = oma_read_header,
- .read_packet = oma_read_packet,
- .read_seek = oma_read_seek,
- .flags = AVFMT_GENERIC_INDEX,
- .extensions = "oma,omg,aa3",
- .codec_tag = (const AVCodecTag* const []){codec_oma_tags, 0},
-};
-
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