diff options
Diffstat (limited to 'libPCMutils/src/pcmdmx_lib.cpp')
| -rw-r--r-- | libPCMutils/src/pcmdmx_lib.cpp | 56 |
1 files changed, 42 insertions, 14 deletions
diff --git a/libPCMutils/src/pcmdmx_lib.cpp b/libPCMutils/src/pcmdmx_lib.cpp index 2070dbc..fca12ce 100644 --- a/libPCMutils/src/pcmdmx_lib.cpp +++ b/libPCMutils/src/pcmdmx_lib.cpp @@ -1,7 +1,7 @@ /* ----------------------------------------------------------------------------- Software License for The Fraunhofer FDK AAC Codec Library for Android -© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten +© Copyright 1995 - 2021 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. All rights reserved. 1. INTRODUCTION @@ -494,13 +494,40 @@ static PCM_DMX_CHANNEL_MODE getChMode4Plain( return plainChMode; } -static inline UINT getIdxSum(UCHAR numCh) { - UINT result = 0; - int i; - for (i = 1; i < numCh; i += 1) { - result += i; +/** Validates the channel indices of all channels present in the bitstream. + * The channel indices have to be consecutive and unique for each audio channel + *type. + * @param [in] The total number of channels of the given configuration. + * @param [in] The total number of channels of the current audio channel type of + *the given configuration. + * @param [in] Audio channel type to be examined. + * @param [in] Array holding the corresponding channel types for each channel. + * @param [in] Array holding the corresponding channel type indices for each + *channel. + * @returns Returns 1 on success, returns 0 on error. + **/ +static UINT validateIndices(UINT numChannels, UINT numChannelsPlaneAndGrp, + AUDIO_CHANNEL_TYPE aChType, + const AUDIO_CHANNEL_TYPE channelType[], + const UCHAR channelIndices[]) { + for (UINT reqValue = 0; reqValue < numChannelsPlaneAndGrp; reqValue++) { + int found = FALSE; + for (UINT i = 0; i < numChannels; i++) { + if (channelType[i] == aChType) { + if (channelIndices[i] == reqValue) { + if (found == TRUE) { + return 0; /* Found channel index a second time */ + } else { + found = TRUE; /* Found channel index */ + } + } + } + } + if (found == FALSE) { + return 0; /* Did not find channel index */ + } } - return result; + return 1; /* Successfully validated channel indices */ } /** Evaluate a given channel configuration and extract a packed channel mode. In @@ -523,7 +550,6 @@ static PCMDMX_ERROR getChannelMode( UCHAR offsetTable[(8)], /* out */ PCM_DMX_CHANNEL_MODE *chMode /* out */ ) { - UINT idxSum[(3)][(4)]; UCHAR numCh[(3)][(4)]; UCHAR mapped[(8)]; PCM_DMX_SPEAKER_POSITION spkrPos[(8)]; @@ -538,7 +564,6 @@ static PCMDMX_ERROR getChannelMode( FDK_ASSERT(chMode != NULL); /* For details see ISO/IEC 13818-7:2005(E), 8.5.3 Channel configuration */ - FDKmemclear(idxSum, (3) * (4) * sizeof(UINT)); FDKmemclear(numCh, (3) * (4) * sizeof(UCHAR)); FDKmemclear(mapped, (8) * sizeof(UCHAR)); FDKmemclear(spkrPos, (8) * sizeof(PCM_DMX_SPEAKER_POSITION)); @@ -552,19 +577,22 @@ static PCMDMX_ERROR getChannelMode( (channelType[ch] & 0x0F) - 1, 0); /* Assign all undefined channels (ACT_NONE) to front channels. */ numCh[channelType[ch] >> 4][chGrp] += 1; - idxSum[channelType[ch] >> 4][chGrp] += channelIndices[ch]; } - if (numChannels > TWO_CHANNEL) { + + { int chGrp; /* Sanity check on the indices */ for (chGrp = 0; chGrp < (4); chGrp += 1) { int plane; for (plane = 0; plane < (3); plane += 1) { - if (idxSum[plane][chGrp] != getIdxSum(numCh[plane][chGrp])) { + if (numCh[plane][chGrp] == 0) continue; + AUDIO_CHANNEL_TYPE aChType = + (AUDIO_CHANNEL_TYPE)((plane << 4) | ((chGrp + 1) & 0xF)); + if (!validateIndices(numChannels, numCh[plane][chGrp], aChType, + channelType, channelIndices)) { unsigned idxCnt = 0; for (ch = 0; ch < numChannels; ch += 1) { - if (channelType[ch] == - (AUDIO_CHANNEL_TYPE)((plane << 4) | ((chGrp + 1) & 0xF))) { + if (channelType[ch] == aChType) { channelIndices[ch] = idxCnt++; } } |