ref: e7a86f9e7d40a6d6354453109fc1c8b6852b0a38
dir: /common/mp4av/mpeg4.cpp/
/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is MPEG4IP.
*
* The Initial Developer of the Original Code is Cisco Systems Inc.
* Portions created by Cisco Systems Inc. are
* Copyright (C) Cisco Systems Inc. 2000-2002. All Rights Reserved.
*
* Contributor(s):
* Dave Mackie [email protected]
*/
/*
* Notes:
* - file formatted with tabstops == 4 spaces
*/
#include <mp4av_common.h>
extern "C" bool MP4AV_Mpeg4ParseVosh(
u_int8_t* pVoshBuf,
u_int32_t voshSize,
u_int8_t* pProfileLevel)
{
CMemoryBitstream vosh;
vosh.SetBytes(pVoshBuf, voshSize);
try {
vosh.GetBits(32); // start code
*pProfileLevel = vosh.GetBits(8);
}
catch (int e) {
return false;
}
return true;
}
extern "C" bool MP4AV_Mpeg4CreateVosh(
u_int8_t** ppBytes,
u_int32_t* pNumBytes,
u_int8_t profileLevel)
{
CMemoryBitstream vosh;
try {
if (*ppBytes) {
// caller must guarantee buffer against overrun
memset((*ppBytes) + (*pNumBytes), 0, 5);
vosh.SetBytes(*ppBytes, (*pNumBytes) + 5);
vosh.SetBitPosition((*pNumBytes) << 3);
} else {
vosh.AllocBytes(5);
}
vosh.PutBits(MP4AV_MPEG4_SYNC, 24);
vosh.PutBits(MP4AV_MPEG4_VOSH_START, 8);
vosh.PutBits(profileLevel, 8);
*ppBytes = vosh.GetBuffer();
*pNumBytes = vosh.GetNumberOfBytes();
}
catch (int e) {
return false;
}
return true;
}
extern "C" bool MP4AV_Mpeg4CreateVo(
u_int8_t** ppBytes,
u_int32_t* pNumBytes,
u_int8_t objectId)
{
CMemoryBitstream vo;
try {
if (*ppBytes) {
// caller must guarantee buffer against overrun
memset((*ppBytes) + (*pNumBytes), 0, 9);
vo.SetBytes(*ppBytes, *pNumBytes + 9);
vo.SetBitPosition((*pNumBytes) << 3);
} else {
vo.AllocBytes(9);
}
vo.PutBits(MP4AV_MPEG4_SYNC, 24);
vo.PutBits(MP4AV_MPEG4_VO_START, 8);
vo.PutBits(0x08, 8); // no verid, priority, or signal type
vo.PutBits(MP4AV_MPEG4_SYNC, 24);
vo.PutBits(objectId - 1, 8);
*ppBytes = vo.GetBuffer();
*pNumBytes = vo.GetNumberOfBytes();
}
catch (int e) {
return false;
}
return true;
}
extern "C" bool MP4AV_Mpeg4ParseVol(
u_int8_t* pVolBuf,
u_int32_t volSize,
u_int8_t* pTimeBits,
u_int16_t* pTimeTicks,
u_int16_t* pFrameDuration,
u_int16_t* pFrameWidth,
u_int16_t* pFrameHeight)
{
CMemoryBitstream vol;
vol.SetBytes(pVolBuf, volSize);
try {
vol.SkipBits(32); // start code
vol.SkipBits(1); // random accessible vol
vol.SkipBits(8); // object type id
u_int8_t verid = 1;
if (vol.GetBits(1)) { // is object layer id
verid = vol.GetBits(4); // object layer verid
vol.SkipBits(3); // object layer priority
}
if (vol.GetBits(4) == 0xF) { // aspect ratio info
vol.SkipBits(8); // par width
vol.SkipBits(8); // par height
}
if (vol.GetBits(1)) { // vol control parameters
vol.SkipBits(2); // chroma format
vol.SkipBits(1); // low delay
if (vol.GetBits(1)) { // vbv parameters
vol.SkipBits(15); // first half bit rate
vol.SkipBits(1); // marker bit
vol.SkipBits(15); // latter half bit rate
vol.SkipBits(1); // marker bit
vol.SkipBits(15); // first half vbv buffer size
vol.SkipBits(1); // marker bit
vol.SkipBits(3); // latter half vbv buffer size
vol.SkipBits(11); // first half vbv occupancy
vol.SkipBits(1); // marker bit
vol.SkipBits(15); // latter half vbv occupancy
vol.SkipBits(1); // marker bit
}
}
u_int8_t shape = vol.GetBits(2); // object layer shape
if (shape == 3 /* GRAYSCALE */ && verid != 1) {
vol.SkipBits(4); // object layer shape extension
}
vol.SkipBits(1); // marker bit
*pTimeTicks = vol.GetBits(16); // vop time increment resolution
u_int8_t i;
u_int32_t powerOf2 = 1;
for (i = 0; i < 16; i++) {
if (*pTimeTicks < powerOf2) {
break;
}
powerOf2 <<= 1;
}
*pTimeBits = i;
vol.SkipBits(1); // marker bit
if (vol.GetBits(1)) { // fixed vop rate
// fixed vop time increment
*pFrameDuration = vol.GetBits(*pTimeBits);
} else {
*pFrameDuration = 0;
}
if (shape == 0 /* RECTANGULAR */) {
vol.SkipBits(1); // marker bit
*pFrameWidth = vol.GetBits(13); // object layer width
vol.SkipBits(1); // marker bit
*pFrameHeight = vol.GetBits(13);// object layer height
vol.SkipBits(1); // marker bit
} else {
*pFrameWidth = 0;
*pFrameHeight = 0;
}
// there's more, but we don't need it
}
catch (int e) {
return false;
}
return true;
}
extern "C" bool MP4AV_Mpeg4CreateVol(
u_int8_t** ppBytes,
u_int32_t* pNumBytes,
u_int8_t profile,
float frameRate,
bool shortTime,
bool variableRate,
u_int16_t width,
u_int16_t height,
u_int8_t quantType,
u_int8_t* pTimeBits)
{
CMemoryBitstream vol;
try {
if (*ppBytes) {
// caller must guarantee buffer against overrun
memset((*ppBytes) + (*pNumBytes), 0, 20);
vol.SetBytes(*ppBytes, *pNumBytes + 20);
vol.SetBitPosition((*pNumBytes) << 3);
} else {
vol.AllocBytes(20);
}
/* VOL - Video Object Layer */
vol.PutBits(MP4AV_MPEG4_SYNC, 24);
vol.PutBits(MP4AV_MPEG4_VOL_START, 8);
/* 1 bit - random access = 0 (1 only if every VOP is an I frame) */
vol.PutBits(0, 1);
/*
* 8 bits - type indication
* = 1 (simple profile)
* = 4 (main profile)
*/
vol.PutBits(profile, 8);
/* 1 bit - is object layer id = 1 */
vol.PutBits(1, 1);
/* 4 bits - visual object layer ver id = 2 */
vol.PutBits(2, 4);
/* 3 bits - visual object layer priority = 1 */
vol.PutBits(1, 3);
/* 4 bits - aspect ratio info = 1 (square pixels) */
vol.PutBits(1, 4);
/* 1 bit - VOL control params = 0 */
vol.PutBits(0, 1);
/* 2 bits - VOL shape = 0 (rectangular) */
vol.PutBits(0, 2);
/* 1 bit - marker = 1 */
vol.PutBits(1, 1);
u_int16_t ticks;
if (shortTime /* && frameRate == (float)((int)frameRate) */) {
ticks = (u_int16_t)(frameRate + 0.5);
} else {
ticks = 30000;
}
/* 16 bits - VOP time increment resolution */
vol.PutBits(ticks, 16);
/* 1 bit - marker = 1 */
vol.PutBits(1, 1);
u_int8_t rangeBits = 1;
while (ticks > (1 << rangeBits)) {
rangeBits++;
}
if (pTimeBits) {
*pTimeBits = rangeBits;
}
/* 1 bit - fixed vop rate = 0 or 1 */
if (variableRate) {
vol.PutBits(0, 1);
} else {
vol.PutBits(1, 1);
u_int16_t frameDuration =
(u_int16_t)((float)ticks / frameRate);
/* 1-16 bits - fixed vop time increment in ticks */
vol.PutBits(frameDuration, rangeBits);
}
/* 1 bit - marker = 1 */
vol.PutBits(1, 1);
/* 13 bits - VOL width */
vol.PutBits(width, 13);
/* 1 bit - marker = 1 */
vol.PutBits(1, 1);
/* 13 bits - VOL height */
vol.PutBits(height, 13);
/* 1 bit - marker = 1 */
vol.PutBits(1, 1);
/* 1 bit - interlaced = 0 */
vol.PutBits(0, 1);
/* 1 bit - overlapped block motion compensation disable = 1 */
vol.PutBits(1, 1);
/* 2 bits - sprite usage = 0 */
vol.PutBits(0, 2);
/* 1 bit - not 8 bit pixels = 0 */
vol.PutBits(0, 1);
/* 1 bit - quant type = 0 */
vol.PutBits(quantType, 1);
if (quantType) {
/* 1 bit - load intra quant mat = 0 */
vol.PutBits(0, 1);
/* 1 bit - load inter quant mat = 0 */
vol.PutBits(0, 1);
}
/* 1 bit - quarter pixel = 0 */
vol.PutBits(0, 1);
/* 1 bit - complexity estimation disable = 1 */
vol.PutBits(1, 1);
/* 1 bit - resync marker disable = 1 */
vol.PutBits(1, 1);
/* 1 bit - data partitioned = 0 */
vol.PutBits(0, 1);
/* 1 bit - newpred = 0 */
vol.PutBits(0, 1);
/* 1 bit - reduced resolution vop = 0 */
vol.PutBits(0, 1);
/* 1 bit - scalability = 0 */
vol.PutBits(0, 1);
/* pad to byte boundary with 0 then as many 1's as needed */
vol.PutBits(0, 1);
if ((vol.GetBitPosition() & 7) != 0) {
vol.PutBits(0xFF, 8 - (vol.GetBitPosition() & 7));
}
*ppBytes = vol.GetBuffer();
*pNumBytes = vol.GetBitPosition() >> 3;
}
catch (int e) {
return false;
}
return true;
}
extern "C" bool MP4AV_Mpeg4ParseGov(
u_int8_t* pGovBuf,
u_int32_t govSize,
u_int8_t* pHours,
u_int8_t* pMinutes,
u_int8_t* pSeconds)
{
CMemoryBitstream gov;
gov.SetBytes(pGovBuf, govSize);
try {
gov.SkipBits(32); // start code
*pHours = gov.GetBits(5);
*pMinutes = gov.GetBits(6);
gov.SkipBits(1); // marker bit
*pSeconds = gov.GetBits(6);
}
catch (int e) {
return false;
}
return true;
}
static bool Mpeg4ParseShortHeaderVop(
u_int8_t* pVopBuf,
u_int32_t vopSize,
u_char* pVopType)
{
CMemoryBitstream vop;
vop.SetBytes(pVopBuf, vopSize);
try {
// skip start code, temporal ref, and into type
vop.SkipBits(22 + 8 + 5 + 3);
if (vop.GetBits(1) == 0) {
*pVopType = 'I';
} else {
*pVopType = 'P';
}
}
catch (int e) {
return false;
}
return true;
}
extern "C" bool MP4AV_Mpeg4ParseVop(
u_int8_t* pVopBuf,
u_int32_t vopSize,
u_char* pVopType,
u_int8_t timeBits,
u_int16_t timeTicks,
u_int32_t* pVopTimeIncrement)
{
CMemoryBitstream vop;
vop.SetBytes(pVopBuf, vopSize);
try {
vop.SkipBits(32); // skip start code
switch (vop.GetBits(2)) {
case 0:
/* Intra */
*pVopType = 'I';
break;
case 1:
/* Predictive */
*pVopType = 'P';
break;
case 2:
/* Bidirectional Predictive */
*pVopType = 'B';
break;
case 3:
/* Sprite */
*pVopType = 'S';
break;
}
if (!pVopTimeIncrement) {
return true;
}
u_int8_t numSecs = 0;
while (vop.GetBits(1) != 0) {
numSecs++;
}
vop.SkipBits(1); // skip marker
u_int16_t numTicks = vop.GetBits(timeBits);
*pVopTimeIncrement = (numSecs * timeTicks) + numTicks;
}
catch (int e) {
return false;
}
return true;
}
// Map from ISO IEC 14496-2:2000 Appendix G
// to ISO IEC 14496-1:2001 8.6.4.2 Table 6
extern "C" u_int8_t
MP4AV_Mpeg4VideoToSystemsProfileLevel(u_int8_t videoProfileLevel)
{
switch (videoProfileLevel) {
// Simple Profile
case 0x01: // L1
return 0x03;
case 0x02: // L2
return 0x02;
case 0x03: // L3
return 0x01;
// Simple Scalable Profile
case 0x11: // L1
return 0x05;
case 0x12: // L2
return 0x04;
// Core Profile
case 0x21: // L1
return 0x07;
case 0x22: // L2
return 0x06;
// Main Profile
case 0x32: // L2
return 0x0A;
case 0x33: // L3
return 0x09;
case 0x34: // L4
return 0x08;
// N-bit Profile
case 0x42: // L2
return 0x0B;
// Scalable Texture
case 0x51: // L1
return 0x12;
case 0x52: // L2
return 0x11;
case 0x53: // L3
return 0x10;
// Simple Face Animation Profile
case 0x61: // L1
return 0x14;
case 0x62: // L2
return 0x13;
// Simple FBA Profile
case 0x63: // L1
case 0x64: // L2
return 0xFE;
// Basic Animated Texture Profile
case 0x71: // L1
return 0x0F;
case 0x72: // L2
return 0x0E;
// Hybrid Profile
case 0x81: // L1
return 0x0D;
case 0x82: // L2
return 0x0C;
// Advanced Real Time Simple Profile
case 0x91: // L1
case 0x92: // L2
case 0x93: // L3
case 0x94: // L4
// Core Scalable Profile
case 0xA1: // L1
case 0xA2: // L2
case 0xA3: // L3
// Advanced Coding Efficiency Profle
case 0xB1: // L1
case 0xB2: // L2
case 0xB3: // L3
case 0xB4: // L4
// Advanced Core Profile
case 0xC1: // L1
case 0xC2: // L2
// Advanced Scalable Texture Profile
case 0xD1: // L1
case 0xD2: // L2
case 0xD3: // L3
// from draft amendments
// Simple Studio
case 0xE1: // L1
case 0xE2: // L2
case 0xE3: // L3
case 0xE4: // L4
// Core Studio Profile
case 0xE5: // L1
case 0xE6: // L2
case 0xE7: // L3
case 0xE8: // L4
// Advanced Simple Profile
case 0xF1: // L0
case 0xF2: // L1
case 0xF3: // L2
case 0xF4: // L3
case 0xF5: // L4
// Fine Granularity Scalable Profile
case 0xF6: // L0
case 0xF7: // L1
case 0xF8: // L2
case 0xF9: // L3
case 0xFA: // L4
default:
return 0xFE;
}
}
extern "C" u_char MP4AV_Mpeg4GetVopType(u_int8_t* pVopBuf, u_int32_t vopSize)
{
u_char vopType = 0;
if (vopSize <= 4) {
return vopType;
}
if (pVopBuf[0] == 0 && pVopBuf[1] == 0
&& (pVopBuf[2] & 0xFC) == 0x08 && (pVopBuf[3] & 0x03) == 0x02) {
// H.263, (MPEG-4 short header mode)
Mpeg4ParseShortHeaderVop(pVopBuf, vopSize, &vopType);
} else {
// MPEG-4 (normal mode)
MP4AV_Mpeg4ParseVop(pVopBuf, vopSize, &vopType, 0, 0, NULL);
}
return vopType;
}