mirror of
https://github.com/WinampDesktop/winamp.git
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327 lines
8.8 KiB
C
327 lines
8.8 KiB
C
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/* ///////////////////////////////////////////////////////////////////////
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//
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// INTEL CORPORATION PROPRIETARY INFORMATION
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// This software is supplied under the terms of a license agreement or
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// nondisclosure agreement with Intel Corporation and may not be copied
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// or disclosed except in accordance with the terms of that agreement.
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// Copyright (c) 2001-2008 Intel Corporation. All Rights Reserved.
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//
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// Description: Decodes MPEG-4 bitstream.
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//
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*/
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#include "mp4def.h"
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#ifndef USE_INLINE_BITS_FUNC
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uint32_t mp4_ShowBits(mp4_Info* pInfo, int32_t n)
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{
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uint8_t* ptr = pInfo->bufptr;
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uint32_t tmp = (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | (ptr[3]);
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tmp <<= pInfo->bitoff;
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tmp >>= 32 - n;
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return tmp;
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}
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uint32_t mp4_ShowBit(mp4_Info* pInfo)
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{
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uint32_t tmp = pInfo->bufptr[0];
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tmp >>= 7 - pInfo->bitoff;
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return (tmp & 1);
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}
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uint32_t mp4_ShowBits9(mp4_Info* pInfo, int32_t n)
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{
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uint8_t* ptr = pInfo->bufptr;
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uint32_t tmp = (ptr[0] << 8) | ptr[1];
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tmp <<= (pInfo->bitoff + 16);
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tmp >>= 32 - n;
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return tmp;
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}
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void mp4_FlushBits(mp4_Info* pInfo, int32_t n)
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{
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n = n + pInfo->bitoff;
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pInfo->bufptr += n >> 3;
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pInfo->bitoff = n & 7;
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}
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uint32_t mp4_GetBits(mp4_Info* pInfo, int32_t n)
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{
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uint8_t* ptr = pInfo->bufptr;
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uint32_t tmp = (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | (ptr[3]);
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tmp <<= pInfo->bitoff;
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tmp >>= 32 - n;
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n = n + pInfo->bitoff;
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pInfo->bufptr += n >> 3;
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pInfo->bitoff = n & 7;
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return tmp;
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}
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uint32_t mp4_GetBits9(mp4_Info* pInfo, int32_t n)
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{
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uint8_t* ptr = pInfo->bufptr;
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uint32_t tmp = (ptr[0] << 8) | ptr[1];
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tmp <<= (pInfo->bitoff + 16);
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tmp >>= 32 - n;
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n = n + pInfo->bitoff;
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pInfo->bufptr += n >> 3;
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pInfo->bitoff = n & 7;
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return tmp;
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}
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void mp4_AlignBits(mp4_Info* pInfo)
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{
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if (pInfo->bitoff > 0) {
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pInfo->bitoff = 0;
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(pInfo->bufptr)++;
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}
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}
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void mp4_AlignBits7F(mp4_Info* pInfo)
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{
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if (pInfo->bitoff > 0) {
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pInfo->bitoff = 0;
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(pInfo->bufptr)++;
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} else {
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if (*pInfo->bufptr == 0x7F)
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(pInfo->bufptr)++;
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}
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}
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uint32_t mp4_ShowBitsAlign(mp4_Info* pInfo, int32_t n)
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{
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uint8_t* ptr = pInfo->bitoff ? (pInfo->bufptr + 1) : pInfo->bufptr;
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uint32_t tmp = (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | (ptr[3]);
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tmp >>= 32 - n;
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return tmp;
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}
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uint32_t mp4_ShowBitsAlign7F(mp4_Info* pInfo, int32_t n)
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{
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uint8_t* ptr = pInfo->bitoff ? (pInfo->bufptr + 1) : pInfo->bufptr;
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uint32_t tmp;
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if (!pInfo->bitoff) {
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if (*ptr == 0x7F)
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ptr ++;
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}
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tmp = (ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | (ptr[3]);
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tmp >>= 32 - n;
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return tmp;
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}
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#endif
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uint8_t* mp4_FindStartCodePtr(mp4_Info* pInfo)
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{
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int32_t i, len = pInfo->buflen - (pInfo->bufptr - pInfo->buffer);
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uint8_t* ptr = pInfo->bufptr;
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for (i = 0; i < len - 3; i++) {
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if (ptr[i] == 0 && ptr[i + 1] == 0 && ptr[i + 2] == 1) {
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return ptr + i + 3;
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}
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}
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return NULL;
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}
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uint8_t* mp4_FindStartCodeOrShortPtr(mp4_Info* pInfo)
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{
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int32_t i, len = pInfo->buflen - (pInfo->bufptr - pInfo->buffer);
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uint8_t* ptr = pInfo->bufptr;
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for (i = 0; i < len - 3; i++) {
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if (ptr[i] == 0 && ptr[i + 1] == 0 && ptr[i + 2] == 1) {
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return ptr + i + 3;
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}
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// short_video_header
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if (ptr[i] == 0 && ptr[i + 1] == 0 && (ptr[i + 2] & 0xFC) == 0x80) {
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return ptr + i;
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}
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}
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return NULL;
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}
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int32_t mp4_SeekStartCodePtr(mp4_Info* pInfo)
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{
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uint8_t* ptr;
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if (pInfo->bitoff) {
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pInfo->bufptr ++;
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pInfo->bitoff = 0;
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}
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ptr = mp4_FindStartCodePtr(pInfo);
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if (ptr) {
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pInfo->bufptr = ptr;
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return 1;
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} else {
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pInfo->bufptr = pInfo->buffer + (pInfo->buflen > 3 ? pInfo->buflen - 3 : 0);
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return 0;
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}
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}
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int32_t mp4_SeekStartCodeOrShortPtr(mp4_Info* pInfo)
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{
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uint8_t* ptr;
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if (pInfo->bitoff) {
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pInfo->bufptr ++;
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pInfo->bitoff = 0;
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}
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ptr = mp4_FindStartCodeOrShortPtr(pInfo);
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if (ptr) {
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pInfo->bufptr = ptr;
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return 1;
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} else {
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pInfo->bufptr = pInfo->buffer + (pInfo->buflen > 3 ? pInfo->buflen - 3 : 0);
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return 0;
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}
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}
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int32_t mp4_SeekStartCodeValue(mp4_Info* pInfo, uint8_t code)
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{
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while (mp4_SeekStartCodePtr(pInfo)) {
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if (*(pInfo->bufptr) == code) {
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(pInfo->bufptr) ++;
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return 1;
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}
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}
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return 0;
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}
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uint8_t* mp4_FindShortVideoStartMarkerPtr(mp4_Info* pInfo)
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{
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int32_t i, len = pInfo->buflen - (pInfo->bufptr - pInfo->buffer);
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uint8_t* ptr = pInfo->bufptr;
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for (i = 0; i < len - 3; i++) {
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if (ptr[i] == 0 && ptr[i + 1] == 0 && (ptr[i + 2] & (~3)) == 0x80) {
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return ptr + i + 2;
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}
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}
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return NULL;
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}
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int32_t mp4_SeekShortVideoStartMarker(mp4_Info* pInfo)
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{
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uint8_t* ptr;
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if (pInfo->bitoff) {
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pInfo->bufptr ++;
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pInfo->bitoff = 0;
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}
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ptr = mp4_FindShortVideoStartMarkerPtr(pInfo);
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if (ptr) {
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pInfo->bufptr = ptr;
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return 1;
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} else {
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pInfo->bufptr = pInfo->buffer + (pInfo->buflen > 3 ? pInfo->buflen - 3 : 0);
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return 0;
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}
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}
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//changed pInfo->len on pInfo->buflen!!!
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int32_t mp4_SeekGOBMarker(mp4_Info* pInfo)
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{
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for (; pInfo->bufptr < pInfo->buffer + pInfo->buflen - 2; pInfo->bufptr ++) {
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if (pInfo->bufptr[0] == 0) {
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pInfo->bitoff = 0;
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if (pInfo->bufptr[0] == 0 && pInfo->bufptr[1] == 0 && (pInfo->bufptr[2] & (~3)) == 0x80)
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return 0;
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pInfo->bufptr --;
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for (pInfo->bitoff = 1; pInfo->bitoff <= 7; pInfo->bitoff ++) {
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if (mp4_ShowBits(pInfo, 17) == 1)
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return 1;
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}
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pInfo->bufptr ++;
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for (pInfo->bitoff = 0; pInfo->bitoff <= 7; pInfo->bitoff ++) {
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if (mp4_ShowBits(pInfo, 17) == 1)
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return 1;
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}
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pInfo->bufptr ++;
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}
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}
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return 0;
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}
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int32_t mp4_SeekResyncMarker(mp4_Info* pInfo)
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{
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int32_t rml;
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if (pInfo->VisualObject.VideoObject.VideoObjectPlane.coding_type == MP4_VOP_TYPE_I)
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rml = 17;
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else if (pInfo->VisualObject.VideoObject.VideoObjectPlane.coding_type == MP4_VOP_TYPE_B)
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rml = 16 + IPP_MAX(pInfo->VisualObject.VideoObject.VideoObjectPlane.fcode_forward, pInfo->VisualObject.VideoObject.VideoObjectPlane.fcode_backward);
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else
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rml = 16 + pInfo->VisualObject.VideoObject.VideoObjectPlane.fcode_forward;
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pInfo->bitoff = 0;
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for (; pInfo->bufptr < pInfo->buffer + pInfo->buflen - 2; pInfo->bufptr ++) {
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if (pInfo->bufptr[0] == 0) {
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if (pInfo->bufptr[0] == 0 && pInfo->bufptr[1] == 0 && pInfo->bufptr[2] == 1)
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return 0;
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if (mp4_ShowBits(pInfo, rml) == 1) {
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// check stuffing bits
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pInfo->bufptr --;
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pInfo->bitoff = 7;
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while (pInfo->bitoff > 0 && mp4_ShowBit(pInfo))
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pInfo->bitoff --;
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if (pInfo->bitoff == 0 && mp4_ShowBit(pInfo)) {
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// stuffing bits are invalid
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pInfo->bufptr[0] = 0x7f;
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}
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return 1;
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}
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pInfo->bufptr += 2;
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}
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}
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return 0;
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}
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int32_t mp4_FindResyncMarker(mp4_Info* pInfo)
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{
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int32_t rml;
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if (pInfo->VisualObject.VideoObject.VideoObjectPlane.coding_type == MP4_VOP_TYPE_I)
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rml = 17;
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else if (pInfo->VisualObject.VideoObject.VideoObjectPlane.coding_type == MP4_VOP_TYPE_B)
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rml = 16 + IPP_MAX(pInfo->VisualObject.VideoObject.VideoObjectPlane.fcode_forward, pInfo->VisualObject.VideoObject.VideoObjectPlane.fcode_backward);
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else
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rml = 16 + pInfo->VisualObject.VideoObject.VideoObjectPlane.fcode_forward;
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pInfo->bitoff = 0;
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for (; pInfo->bufptr < pInfo->buffer + pInfo->buflen - 2; pInfo->bufptr ++) {
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if (pInfo->bufptr[0] == 0)
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{
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if (pInfo->bufptr[0] == 0 && pInfo->bufptr[1] == 0 && pInfo->bufptr[2] == 1)
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return 0;
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if (mp4_ShowBits(pInfo, rml) == 1)
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{
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return rml;
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}
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}
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}
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return 0;
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}
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int mp4_IsStartCodeOrShort(mp4_Info* pInfo)
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{
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if (pInfo->bufptr[0] == 0 && pInfo->bufptr[1] == 0 && (pInfo->bufptr[2] == 1 || ((pInfo->bufptr[2] & 0xFC) == 0x80)))
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return 1;
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return 0;
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}
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int mp4_IsStartCodeValue(mp4_Info* pInfo, int min, int max)
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{
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if (pInfo->bufptr[0-3] == 0 && pInfo->bufptr[1-3] == 0 && pInfo->bufptr[2-3] == 1)
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if (pInfo->bufptr[3-3] >= min && pInfo->bufptr[3-3] <= max)
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return 1;
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return 0;
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}
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int mp4_IsShortCode(mp4_Info* pInfo)
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{
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if (pInfo->bufptr[0] == 0 && pInfo->bufptr[1] == 0 && ((pInfo->bufptr[2] & 0xFC) == 0x80))
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return 1;
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return 0;
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}
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