From 08f7af0c379d9eaa931a93e6e733879237be054d Mon Sep 17 00:00:00 2001 From: Anton Khirnov Date: Sat, 17 Dec 2011 15:00:04 +0100 Subject: lavf: rename oma.c -> omadec.c --- libavformat/omadec.c | 464 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 464 insertions(+) create mode 100644 libavformat/omadec.c (limited to 'libavformat/omadec.c') diff --git a/libavformat/omadec.c b/libavformat/omadec.c new file mode 100644 index 0000000000..1aa9a25477 --- /dev/null +++ b/libavformat/omadec.c @@ -0,0 +1,464 @@ +/* + * Sony OpenMG (OMA) demuxer + * + * Copyright (c) 2008 Maxim Poliakovski + * 2008 Benjamin Larsson + * 2011 David Goldwich + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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!). + * + * 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" + +#define EA3_HEADER_SIZE 96 +#define ID3v2_EA3_MAGIC "ea3" +#define OMA_ENC_HEADER_SIZE 16 + +enum { + OMA_CODECID_ATRAC3 = 0, + OMA_CODECID_ATRAC3P = 1, + OMA_CODECID_MP3 = 3, + OMA_CODECID_LPCM = 4, + OMA_CODECID_WMA = 5, +}; + +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}, +}; + -- cgit v1.2.3