mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-20 16:25:04 +02:00
511 lines
15 KiB
C
511 lines
15 KiB
C
/*
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* Sony OpenMG (OMA) demuxer
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*
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* Copyright (c) 2008, 2013 Maxim Poliakovski
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* 2008 Benjamin Larsson
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* 2011 David Goldwich
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* This is a demuxer for Sony OpenMG Music files
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*
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* Known file extensions: ".oma", "aa3"
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* The format of such files consists of three parts:
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* - "ea3" header carrying overall info and metadata. Except for starting with
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* "ea" instead of "ID", it's an ID3v2 header.
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* - "EA3" header is a Sony-specific header containing information about
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* the OpenMG file: codec type (usually ATRAC, can also be MP3 or WMA),
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* codec specific info (packet size, sample rate, channels and so on)
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* and DRM related info (file encryption, content id).
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* - Sound data organized in packets follow the EA3 header
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* (can be encrypted using the Sony DRM!).
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*
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* Supported decoders: ATRAC3, ATRAC3+, MP3, LPCM
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*/
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#include <inttypes.h>
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#include "libavutil/channel_layout.h"
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#include "avformat.h"
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#include "internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/des.h"
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#include "libavutil/mathematics.h"
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#include "oma.h"
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#include "pcm.h"
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#include "id3v2.h"
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static const uint64_t leaf_table[] = {
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0xd79e8283acea4620, 0x7a9762f445afd0d8,
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0x354d60a60b8c79f1, 0x584e1cde00b07aee,
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0x1573cd93da7df623, 0x47f98d79620dd535
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};
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typedef struct OMAContext {
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uint64_t content_start;
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int encrypted;
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uint16_t k_size;
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uint16_t e_size;
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uint16_t i_size;
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uint16_t s_size;
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uint32_t rid;
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uint8_t r_val[24];
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uint8_t n_val[24];
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uint8_t m_val[8];
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uint8_t s_val[8];
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uint8_t sm_val[8];
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uint8_t e_val[8];
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uint8_t iv[8];
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struct AVDES av_des;
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} OMAContext;
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static void hex_log(AVFormatContext *s, int level,
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const char *name, const uint8_t *value, int len)
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{
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char buf[33];
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len = FFMIN(len, 16);
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if (av_log_get_level() < level)
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return;
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ff_data_to_hex(buf, value, len, 1);
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buf[len << 1] = '\0';
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av_log(s, level, "%s: %s\n", name, buf);
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}
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static int kset(AVFormatContext *s, const uint8_t *r_val, const uint8_t *n_val,
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int len)
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{
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OMAContext *oc = s->priv_data;
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if (!r_val && !n_val)
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return -1;
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len = FFMIN(len, 16);
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/* use first 64 bits in the third round again */
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if (r_val) {
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if (r_val != oc->r_val) {
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memset(oc->r_val, 0, 24);
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memcpy(oc->r_val, r_val, len);
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}
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memcpy(&oc->r_val[16], r_val, 8);
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}
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if (n_val) {
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if (n_val != oc->n_val) {
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memset(oc->n_val, 0, 24);
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memcpy(oc->n_val, n_val, len);
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}
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memcpy(&oc->n_val[16], n_val, 8);
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}
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return 0;
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}
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#define OMA_RPROBE_M_VAL 48 + 1
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static int rprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
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const uint8_t *r_val)
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{
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OMAContext *oc = s->priv_data;
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unsigned int pos;
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struct AVDES av_des;
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if (!enc_header || !r_val ||
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size < OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size ||
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size < OMA_RPROBE_M_VAL)
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return -1;
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/* m_val */
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av_des_init(&av_des, r_val, 192, 1);
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av_des_crypt(&av_des, oc->m_val, &enc_header[48], 1, NULL, 1);
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/* s_val */
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av_des_init(&av_des, oc->m_val, 64, 0);
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av_des_crypt(&av_des, oc->s_val, NULL, 1, NULL, 0);
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/* sm_val */
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pos = OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size;
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av_des_init(&av_des, oc->s_val, 64, 0);
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av_des_mac(&av_des, oc->sm_val, &enc_header[pos], (oc->i_size >> 3));
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pos += oc->i_size;
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return memcmp(&enc_header[pos], oc->sm_val, 8) ? -1 : 0;
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}
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static int nprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
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const uint8_t *n_val)
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{
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OMAContext *oc = s->priv_data;
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uint64_t pos;
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uint32_t taglen, datalen;
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struct AVDES av_des;
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if (!enc_header || !n_val ||
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size < OMA_ENC_HEADER_SIZE + oc->k_size + 4)
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return -1;
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pos = OMA_ENC_HEADER_SIZE + oc->k_size;
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if (!memcmp(&enc_header[pos], "EKB ", 4))
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pos += 32;
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if (size < pos + 44)
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return -1;
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if (AV_RB32(&enc_header[pos]) != oc->rid)
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av_log(s, AV_LOG_DEBUG, "Mismatching RID\n");
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taglen = AV_RB32(&enc_header[pos + 32]);
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datalen = AV_RB32(&enc_header[pos + 36]) >> 4;
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pos += 44LL + taglen;
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if (pos + (((uint64_t)datalen) << 4) > size)
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return -1;
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av_des_init(&av_des, n_val, 192, 1);
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while (datalen-- > 0) {
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av_des_crypt(&av_des, oc->r_val, &enc_header[pos], 2, NULL, 1);
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kset(s, oc->r_val, NULL, 16);
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if (!rprobe(s, enc_header, size, oc->r_val))
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return 0;
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pos += 16;
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}
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return -1;
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}
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static int decrypt_init(AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header)
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{
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OMAContext *oc = s->priv_data;
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ID3v2ExtraMetaGEOB *geob = NULL;
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uint8_t *gdata;
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oc->encrypted = 1;
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av_log(s, AV_LOG_INFO, "File is encrypted\n");
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/* find GEOB metadata */
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while (em) {
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if (!strcmp(em->tag, "GEOB") &&
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(geob = em->data) &&
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(!strcmp(geob->description, "OMG_LSI") ||
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!strcmp(geob->description, "OMG_BKLSI"))) {
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break;
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}
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em = em->next;
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}
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if (!em) {
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av_log(s, AV_LOG_ERROR, "No encryption header found\n");
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return AVERROR_INVALIDDATA;
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}
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if (geob->datasize < 64) {
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av_log(s, AV_LOG_ERROR,
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"Invalid GEOB data size: %"PRIu32"\n", geob->datasize);
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return AVERROR_INVALIDDATA;
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}
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gdata = geob->data;
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if (AV_RB16(gdata) != 1)
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av_log(s, AV_LOG_WARNING, "Unknown version in encryption header\n");
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oc->k_size = AV_RB16(&gdata[2]);
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oc->e_size = AV_RB16(&gdata[4]);
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oc->i_size = AV_RB16(&gdata[6]);
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oc->s_size = AV_RB16(&gdata[8]);
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if (memcmp(&gdata[OMA_ENC_HEADER_SIZE], "KEYRING ", 12)) {
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av_log(s, AV_LOG_ERROR, "Invalid encryption header\n");
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return AVERROR_INVALIDDATA;
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}
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if (OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size + 8 > geob->datasize ||
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OMA_ENC_HEADER_SIZE + 48 > geob->datasize) {
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av_log(s, AV_LOG_ERROR, "Too little GEOB data\n");
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return AVERROR_INVALIDDATA;
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}
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oc->rid = AV_RB32(&gdata[OMA_ENC_HEADER_SIZE + 28]);
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av_log(s, AV_LOG_DEBUG, "RID: %.8"PRIx32"\n", oc->rid);
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memcpy(oc->iv, &header[0x58], 8);
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hex_log(s, AV_LOG_DEBUG, "IV", oc->iv, 8);
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hex_log(s, AV_LOG_DEBUG, "CBC-MAC",
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&gdata[OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size],
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8);
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if (s->keylen > 0) {
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kset(s, s->key, s->key, s->keylen);
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}
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if (!memcmp(oc->r_val, (const uint8_t[8]){0}, 8) ||
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rprobe(s, gdata, geob->datasize, oc->r_val) < 0 &&
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nprobe(s, gdata, geob->datasize, oc->n_val) < 0) {
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int i;
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for (i = 0; i < FF_ARRAY_ELEMS(leaf_table); i += 2) {
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uint8_t buf[16];
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AV_WL64(buf, leaf_table[i]);
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AV_WL64(&buf[8], leaf_table[i + 1]);
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kset(s, buf, buf, 16);
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if (!rprobe(s, gdata, geob->datasize, oc->r_val) ||
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!nprobe(s, gdata, geob->datasize, oc->n_val))
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break;
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}
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if (i >= FF_ARRAY_ELEMS(leaf_table)) {
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av_log(s, AV_LOG_ERROR, "Invalid key\n");
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return AVERROR_INVALIDDATA;
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}
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}
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/* e_val */
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av_des_init(&oc->av_des, oc->m_val, 64, 0);
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av_des_crypt(&oc->av_des, oc->e_val,
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&gdata[OMA_ENC_HEADER_SIZE + 40], 1, NULL, 0);
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hex_log(s, AV_LOG_DEBUG, "EK", oc->e_val, 8);
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/* init e_val */
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av_des_init(&oc->av_des, oc->e_val, 64, 1);
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return 0;
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}
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static int oma_read_header(AVFormatContext *s)
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{
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int ret, framesize, jsflag, samplerate;
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uint32_t codec_params, channel_id;
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int16_t eid;
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uint8_t buf[EA3_HEADER_SIZE];
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uint8_t *edata;
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AVStream *st;
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ID3v2ExtraMeta *extra_meta = NULL;
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OMAContext *oc = s->priv_data;
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ff_id3v2_read(s, ID3v2_EA3_MAGIC, &extra_meta, 0);
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ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
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if (ret < EA3_HEADER_SIZE)
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return -1;
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if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}), 3) ||
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buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
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av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
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return AVERROR_INVALIDDATA;
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}
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oc->content_start = avio_tell(s->pb);
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/* encrypted file */
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eid = AV_RB16(&buf[6]);
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if (eid != -1 && eid != -128 && decrypt_init(s, extra_meta, buf) < 0) {
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ff_id3v2_free_extra_meta(&extra_meta);
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return -1;
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}
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ff_id3v2_free_extra_meta(&extra_meta);
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codec_params = AV_RB24(&buf[33]);
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->start_time = 0;
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_tag = buf[32];
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st->codec->codec_id = ff_codec_get_id(ff_oma_codec_tags,
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st->codec->codec_tag);
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switch (buf[32]) {
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case OMA_CODECID_ATRAC3:
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samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
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if (!samplerate) {
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av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
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return AVERROR_INVALIDDATA;
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}
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if (samplerate != 44100)
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avpriv_request_sample(s, "Sample rate %d", samplerate);
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framesize = (codec_params & 0x3FF) * 8;
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/* get stereo coding mode, 1 for joint-stereo */
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jsflag = (codec_params >> 17) & 1;
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st->codec->channels = 2;
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st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
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st->codec->sample_rate = samplerate;
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st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024;
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/* fake the ATRAC3 extradata
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* (wav format, makes stream copy to wav work) */
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if (ff_alloc_extradata(st->codec, 14))
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return AVERROR(ENOMEM);
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edata = st->codec->extradata;
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AV_WL16(&edata[0], 1); // always 1
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AV_WL32(&edata[2], samplerate); // samples rate
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AV_WL16(&edata[6], jsflag); // coding mode
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AV_WL16(&edata[8], jsflag); // coding mode
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AV_WL16(&edata[10], 1); // always 1
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// AV_WL16(&edata[12], 0); // always 0
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
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break;
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case OMA_CODECID_ATRAC3P:
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channel_id = (codec_params >> 10) & 7;
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if (!channel_id) {
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av_log(s, AV_LOG_ERROR,
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"Invalid ATRAC-X channel id: %"PRIu32"\n", channel_id);
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return AVERROR_INVALIDDATA;
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}
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st->codec->channel_layout = ff_oma_chid_to_native_layout[channel_id - 1];
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st->codec->channels = ff_oma_chid_to_num_channels[channel_id - 1];
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framesize = ((codec_params & 0x3FF) * 8) + 8;
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samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100;
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if (!samplerate) {
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av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n");
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return AVERROR_INVALIDDATA;
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}
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st->codec->sample_rate = samplerate;
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st->codec->bit_rate = samplerate * framesize * 8 / 2048;
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avpriv_set_pts_info(st, 64, 1, samplerate);
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break;
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case OMA_CODECID_MP3:
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st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
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framesize = 1024;
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break;
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case OMA_CODECID_LPCM:
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/* PCM 44.1 kHz 16 bit stereo big-endian */
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st->codec->channels = 2;
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st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
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st->codec->sample_rate = 44100;
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framesize = 1024;
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/* bit rate = sample rate x PCM block align (= 4) x 8 */
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st->codec->bit_rate = st->codec->sample_rate * 32;
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st->codec->bits_per_coded_sample =
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av_get_bits_per_sample(st->codec->codec_id);
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
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break;
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default:
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av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n", buf[32]);
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return AVERROR(ENOSYS);
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}
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st->codec->block_align = framesize;
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return 0;
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}
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static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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OMAContext *oc = s->priv_data;
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AVStream *st = s->streams[0];
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int packet_size = st->codec->block_align;
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int byte_rate = st->codec->bit_rate >> 3;
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int64_t pos = avio_tell(s->pb);
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int ret = av_get_packet(s->pb, pkt, packet_size);
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if (ret < packet_size)
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pkt->flags |= AV_PKT_FLAG_CORRUPT;
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if (ret < 0)
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return ret;
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if (!ret)
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return AVERROR_EOF;
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pkt->stream_index = 0;
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if (pos >= oc->content_start && byte_rate > 0) {
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pkt->pts =
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pkt->dts = av_rescale(pos - oc->content_start, st->time_base.den,
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byte_rate * (int64_t)st->time_base.num);
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}
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if (oc->encrypted) {
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/* previous unencrypted block saved in IV for
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* the next packet (CBC mode) */
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if (ret == packet_size)
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av_des_crypt(&oc->av_des, pkt->data, pkt->data,
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(packet_size >> 3), oc->iv, 1);
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else
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memset(oc->iv, 0, 8);
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}
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return ret;
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}
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static int oma_read_probe(AVProbeData *p)
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{
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const uint8_t *buf = p->buf;
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unsigned tag_len = 0;
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if (p->buf_size >= ID3v2_HEADER_SIZE && ff_id3v2_match(buf, ID3v2_EA3_MAGIC))
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tag_len = ff_id3v2_tag_len(buf);
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/* This check cannot overflow as tag_len has at most 28 bits */
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if (p->buf_size < tag_len + 5)
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/* EA3 header comes late, might be outside of the probe buffer */
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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;
|
|
int64_t 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;
|
|
}
|
|
|
|
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 []){ff_oma_codec_tags, 0},
|
|
};
|