diff options
Diffstat (limited to 'media/libstagefright/codecs/mp3dec/src/pvmp3_get_side_info.cpp')
| -rw-r--r-- | media/libstagefright/codecs/mp3dec/src/pvmp3_get_side_info.cpp | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/mp3dec/src/pvmp3_get_side_info.cpp b/media/libstagefright/codecs/mp3dec/src/pvmp3_get_side_info.cpp new file mode 100644 index 0000000..7eaa860 --- /dev/null +++ b/media/libstagefright/codecs/mp3dec/src/pvmp3_get_side_info.cpp @@ -0,0 +1,285 @@ +/* ------------------------------------------------------------------ + * Copyright (C) 1998-2009 PacketVideo + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either + * express or implied. + * See the License for the specific language governing permissions + * and limitations under the License. + * ------------------------------------------------------------------- + */ +/* +------------------------------------------------------------------------------ + + PacketVideo Corp. + MP3 Decoder Library + + Filename: pvmp3_get_side_info.cpp + + Date: 09/21/2007 + +------------------------------------------------------------------------------ + REVISION HISTORY + + + Description: + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + +Input + mp3SideInfo *si, + mp3Header *info, mp3 header information + uint32 *crc initialized crc value (if enabled) + + + Returns + + mp3SideInfo *si, side information + + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + acquires side information + +------------------------------------------------------------------------------ + REQUIREMENTS + + +------------------------------------------------------------------------------ + REFERENCES + + [1] ISO MPEG Audio Subgroup Software Simulation Group (1996) + ISO 13818-3 MPEG-2 Audio Decoder - Lower Sampling Frequency Extension + +------------------------------------------------------------------------------ + PSEUDO-CODE + +------------------------------------------------------------------------------ +*/ + + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ + +#include "pvmp3_get_side_info.h" +#include "pvmp3_crc.h" + + +/*---------------------------------------------------------------------------- +; MACROS +; Define module specific macros here +----------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------- +; DEFINES +; Include all pre-processor statements here. Include conditional +; compile variables also. +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL FUNCTION DEFINITIONS +; Function Prototype declaration +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL STORE/BUFFER/POINTER DEFINITIONS +; Variable declaration - defined here and used outside this module +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; EXTERNAL FUNCTION REFERENCES +; Declare functions defined elsewhere and referenced in this module +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES +; Declare variables used in this module but defined elsewhere +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; FUNCTION CODE +----------------------------------------------------------------------------*/ + +ERROR_CODE pvmp3_get_side_info(tmp3Bits *inputStream, + mp3SideInfo *si, + mp3Header *info, + uint32 *crc) +{ + int32 ch, gr; + uint32 tmp; + + int stereo = (info->mode == MPG_MD_MONO) ? 1 : 2; + + if (info->version_x == MPEG_1) + { + if (stereo == 1) + { + tmp = getbits_crc(inputStream, 14, crc, info->error_protection); + si->main_data_begin = (tmp << 18) >> 23; /* 9 */ + si->private_bits = (tmp << 23) >> 27; /* 5 */ + } + else + { + tmp = getbits_crc(inputStream, 12, crc, info->error_protection); + si->main_data_begin = (tmp << 20) >> 23; /* 9 */ + si->private_bits = (tmp << 23) >> 29; /* 3 */ + + } + + for (ch = 0; ch < stereo; ch++) + { + tmp = getbits_crc(inputStream, 4, crc, info->error_protection); + si->ch[ch].scfsi[0] = (tmp << 28) >> 31; /* 1 */ + si->ch[ch].scfsi[1] = (tmp << 29) >> 31; /* 1 */ + si->ch[ch].scfsi[2] = (tmp << 30) >> 31; /* 1 */ + si->ch[ch].scfsi[3] = tmp & 1; /* 1 */ + } + + for (gr = 0; gr < 2 ; gr++) + { + for (ch = 0; ch < stereo; ch++) + { + si->ch[ch].gran[gr].part2_3_length = getbits_crc(inputStream, 12, crc, info->error_protection); + tmp = getbits_crc(inputStream, 22, crc, info->error_protection); + + si->ch[ch].gran[gr].big_values = (tmp << 10) >> 23; /* 9 */ + si->ch[ch].gran[gr].global_gain = ((tmp << 19) >> 24) - 210; /* 8 */ + si->ch[ch].gran[gr].scalefac_compress = (tmp << 27) >> 28; /* 4 */ + si->ch[ch].gran[gr].window_switching_flag = tmp & 1; /* 1 */ + + if (si->ch[ch].gran[gr].window_switching_flag) + { + tmp = getbits_crc(inputStream, 22, crc, info->error_protection); + + si->ch[ch].gran[gr].block_type = (tmp << 10) >> 30; /* 2 */; + si->ch[ch].gran[gr].mixed_block_flag = (tmp << 12) >> 31; /* 1 */; + + si->ch[ch].gran[gr].table_select[0] = (tmp << 13) >> 27; /* 5 */; + si->ch[ch].gran[gr].table_select[1] = (tmp << 18) >> 27; /* 5 */; + + si->ch[ch].gran[gr].subblock_gain[0] = (tmp << 23) >> 29; /* 3 */; + si->ch[ch].gran[gr].subblock_gain[1] = (tmp << 26) >> 29; /* 3 */; + si->ch[ch].gran[gr].subblock_gain[2] = (tmp << 29) >> 29; /* 3 */; + + /* Set region_count parameters since they are implicit in this case. */ + + if (si->ch[ch].gran[gr].block_type == 0) + { + return(SIDE_INFO_ERROR); + } + else if ((si->ch[ch].gran[gr].block_type == 2) + && (si->ch[ch].gran[gr].mixed_block_flag == 0)) + { + si->ch[ch].gran[gr].region0_count = 8; /* MI 9; */ + si->ch[ch].gran[gr].region1_count = 12; + } + else + { + si->ch[ch].gran[gr].region0_count = 7; /* MI 8; */ + si->ch[ch].gran[gr].region1_count = 13; + } + } + else + { + tmp = getbits_crc(inputStream, 22, crc, info->error_protection); + + si->ch[ch].gran[gr].table_select[0] = (tmp << 10) >> 27; /* 5 */; + si->ch[ch].gran[gr].table_select[1] = (tmp << 15) >> 27; /* 5 */; + si->ch[ch].gran[gr].table_select[2] = (tmp << 20) >> 27; /* 5 */; + + si->ch[ch].gran[gr].region0_count = (tmp << 25) >> 28; /* 4 */; + si->ch[ch].gran[gr].region1_count = (tmp << 29) >> 29; /* 3 */; + + si->ch[ch].gran[gr].block_type = 0; + } + + tmp = getbits_crc(inputStream, 3, crc, info->error_protection); + si->ch[ch].gran[gr].preflag = (tmp << 29) >> 31; /* 1 */ + si->ch[ch].gran[gr].scalefac_scale = (tmp << 30) >> 31; /* 1 */ + si->ch[ch].gran[gr].count1table_select = tmp & 1; /* 1 */ + } + } + } + else /* Layer 3 LSF */ + { + si->main_data_begin = getbits_crc(inputStream, 8, crc, info->error_protection); + si->private_bits = getbits_crc(inputStream, stereo, crc, info->error_protection); + + for (ch = 0; ch < stereo; ch++) + { + tmp = getbits_crc(inputStream, 21, crc, info->error_protection); + si->ch[ch].gran[0].part2_3_length = (tmp << 11) >> 20; /* 12 */ + si->ch[ch].gran[0].big_values = (tmp << 23) >> 23; /* 9 */ + + tmp = getbits_crc(inputStream, 18, crc, info->error_protection); + si->ch[ch].gran[0].global_gain = ((tmp << 14) >> 24) - 210; /* 8 */ + si->ch[ch].gran[0].scalefac_compress = (tmp << 22) >> 23; /* 9 */ + si->ch[ch].gran[0].window_switching_flag = tmp & 1; /* 1 */ + + if (si->ch[ch].gran[0].window_switching_flag) + { + + tmp = getbits_crc(inputStream, 22, crc, info->error_protection); + + si->ch[ch].gran[0].block_type = (tmp << 10) >> 30; /* 2 */; + si->ch[ch].gran[0].mixed_block_flag = (tmp << 12) >> 31; /* 1 */; + + si->ch[ch].gran[0].table_select[0] = (tmp << 13) >> 27; /* 5 */; + si->ch[ch].gran[0].table_select[1] = (tmp << 18) >> 27; /* 5 */; + + si->ch[ch].gran[0].subblock_gain[0] = (tmp << 23) >> 29; /* 3 */; + si->ch[ch].gran[0].subblock_gain[1] = (tmp << 26) >> 29; /* 3 */; + si->ch[ch].gran[0].subblock_gain[2] = (tmp << 29) >> 29; /* 3 */; + + /* Set region_count parameters since they are implicit in this case. */ + + if (si->ch[ch].gran[0].block_type == 0) + { + return(SIDE_INFO_ERROR); + } + else if ((si->ch[ch].gran[0].block_type == 2) + && (si->ch[ch].gran[0].mixed_block_flag == 0)) + { + si->ch[ch].gran[0].region0_count = 8; /* MI 9; */ + si->ch[ch].gran[0].region1_count = 12; + } + else + { + si->ch[ch].gran[0].region0_count = 7; /* MI 8; */ + si->ch[ch].gran[0].region1_count = 13; + } + } + else + { + tmp = getbits_crc(inputStream, 22, crc, info->error_protection); + + si->ch[ch].gran[0].table_select[0] = (tmp << 10) >> 27; /* 5 */; + si->ch[ch].gran[0].table_select[1] = (tmp << 15) >> 27; /* 5 */; + si->ch[ch].gran[0].table_select[2] = (tmp << 20) >> 27; /* 5 */; + + si->ch[ch].gran[0].region0_count = (tmp << 25) >> 28; /* 4 */; + si->ch[ch].gran[0].region1_count = (tmp << 29) >> 29; /* 3 */; + + si->ch[ch].gran[0].block_type = 0; + } + + tmp = getbits_crc(inputStream, 2, crc, info->error_protection); + si->ch[ch].gran[0].scalefac_scale = tmp >> 1; /* 1 */ + si->ch[ch].gran[0].count1table_select = tmp & 1; /* 1 */ + + } + } + return (NO_DECODING_ERROR); +} + |