X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Foma.c;h=f6454d97afe4011bd9650ef2ff039815292fafc2;hb=6e9bbc6525989f7dc51acc76712c6ca674053b60;hp=da014689d027e98e09522496e5de205b9407410a;hpb=3b3bbdd3e63a3a1eaf69b861f72cf74f1669afe1;p=ffmpeg diff --git a/libavformat/oma.c b/libavformat/oma.c index da014689d02..f6454d97afe 100644 --- a/libavformat/oma.c +++ b/libavformat/oma.c @@ -1,9 +1,5 @@ /* - * 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. * @@ -22,425 +18,16 @@ * 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 "libavutil/intreadwrite.h" -#include "libavutil/des.h" -#include "pcm.h" -#include "riff.h" -#include "id3v2.h" +#include "internal.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 }, -}; - -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 - - av_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; - av_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; - 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; - /* version must be 3 and flags byte zero */ - if (ff_id3v2_match(buf, ID3v2_EA3_MAGIC) && buf[3] == 3 && !buf[4]) - 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) - return 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; - - 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}, -}; -