isma.cpp

AAC编解码源码

/*
 * 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. 2001.  All Rights Reserved.
 * 
 * Contributor(s): 
 *		Dave Mackie		  [e-mail]
 *              Alix Marchandise-Franquet [e-mail]
 */

#include "mp4common.h"

static u_int8_t BifsV2Config[3] = {
	0x00, 0x00, 0x60 // IsCommandStream = 1, PixelMetric = 1
};

void MP4File::MakeIsmaCompliant(bool addIsmaComplianceSdp)
{
	ProtectWriteOperation("MP4MakeIsmaCompliant");

	if (m_useIsma) {
		// already done
		return;
	}
	m_useIsma = true;

	// find first audio and/or video tracks

	MP4TrackId audioTrackId = MP4_INVALID_TRACK_ID;
	try {
		audioTrackId = FindTrackId(0, MP4_AUDIO_TRACK_TYPE);
	}
	catch (MP4Error* e) {
		delete e;
	}

	MP4TrackId videoTrackId = MP4_INVALID_TRACK_ID;
	try {
		videoTrackId = FindTrackId(0, MP4_VIDEO_TRACK_TYPE);
	}
	catch (MP4Error* e) {
		delete e;
	}

	u_int64_t fileMsDuration =
		ConvertFromMovieDuration(GetDuration(), MP4_MSECS_TIME_SCALE);

	// delete any existing OD track
	if (m_odTrackId != MP4_INVALID_TRACK_ID) {
		DeleteTrack(m_odTrackId);
	}

	AddODTrack();
	SetODProfileLevel(0xFF);

	if (audioTrackId != MP4_INVALID_TRACK_ID) {
		AddTrackToOd(audioTrackId);
	}

	if (videoTrackId != MP4_INVALID_TRACK_ID) {
		AddTrackToOd(videoTrackId);
	}

	// delete any existing scene track
	MP4TrackId sceneTrackId = MP4_INVALID_TRACK_ID;
	try {
		sceneTrackId = FindTrackId(0, MP4_SCENE_TRACK_TYPE);
	}
	catch (MP4Error *e) {
		delete e;
	}
	if (sceneTrackId != MP4_INVALID_TRACK_ID) {
		DeleteTrack(sceneTrackId);
	}

	// add scene track
	sceneTrackId = AddSceneTrack();
	SetSceneProfileLevel(0xFF);
	SetGraphicsProfileLevel(0xFF);
	SetTrackIntegerProperty(sceneTrackId, 
		"mdia.minf.stbl.stsd.mp4s.esds.decConfigDescr.objectTypeId", 
		MP4SystemsV2ObjectType);
	
	SetTrackESConfiguration(sceneTrackId, 
		BifsV2Config, sizeof(BifsV2Config));

	u_int8_t* pBytes = NULL;
	u_int64_t numBytes = 0;

	// write OD Update Command
	CreateIsmaODUpdateCommandFromFileForFile(
		m_odTrackId, 
		audioTrackId, 
		videoTrackId,
		&pBytes, 
		&numBytes);

	WriteSample(m_odTrackId, pBytes, numBytes, fileMsDuration);

	MP4Free(pBytes);
	pBytes = NULL;

	// write BIFS Scene Replace Command
	CreateIsmaSceneCommand(
		MP4_IS_VALID_TRACK_ID(audioTrackId), 
		MP4_IS_VALID_TRACK_ID(videoTrackId),
		&pBytes, 
		&numBytes);

	WriteSample(sceneTrackId, pBytes, numBytes, fileMsDuration);

	MP4Free(pBytes);
	pBytes = NULL;

	// add session level sdp 
	CreateIsmaIodFromFile(
		m_odTrackId, 
		sceneTrackId, 
		audioTrackId, 
		videoTrackId,
		&pBytes, 
		&numBytes);

	char* iodBase64 = MP4ToBase64(pBytes, numBytes);

	char* sdpBuf = (char*)MP4Calloc(strlen(iodBase64) + 256);

	if (addIsmaComplianceSdp) {
		strcpy(sdpBuf, "a=isma-compliance:1,1.0,1\015\012");
	}

	sprintf(&sdpBuf[strlen(sdpBuf)], 
		"a=mpeg4-iod: \042data:application/mpeg4-iod;base64,%s\042\015\012",
		iodBase64);

	SetSessionSdp(sdpBuf);

	VERBOSE_ISMA(GetVerbosity(),
		printf("IOD SDP = %s\n", sdpBuf));

	MP4Free(iodBase64);
	iodBase64 = NULL;
	MP4Free(pBytes);
	pBytes = NULL;
	MP4Free(sdpBuf);
	sdpBuf = NULL;
}

static void CloneIntegerProperty(
	MP4Descriptor* pDest, 
	MP4DescriptorProperty* pSrc,
	const char* name)
{
	MP4IntegerProperty* pGetProperty;
	MP4IntegerProperty* pSetProperty;

	pSrc->FindProperty(name, (MP4Property**)&pGetProperty);
	pDest->FindProperty(name, (MP4Property**)&pSetProperty);

	pSetProperty->SetValue(pGetProperty->GetValue());
} 

void MP4File::CreateIsmaIodFromFile(
	MP4TrackId odTrackId,
	MP4TrackId sceneTrackId,
	MP4TrackId audioTrackId, 
	MP4TrackId videoTrackId,
	u_int8_t** ppBytes,
	u_int64_t* pNumBytes)
{
	MP4Descriptor* pIod = new MP4IODescriptor();
	pIod->SetTag(MP4IODescrTag);
	pIod->Generate();

	MP4Atom* pIodsAtom = FindAtom("moov.iods");
	ASSERT(pIodsAtom);
	MP4DescriptorProperty* pSrcIod = 
		(MP4DescriptorProperty*)pIodsAtom->GetProperty(2);

	CloneIntegerProperty(pIod, pSrcIod, "objectDescriptorId");
	CloneIntegerProperty(pIod, pSrcIod, "ODProfileLevelId");
	CloneIntegerProperty(pIod, pSrcIod, "sceneProfileLevelId");
	CloneIntegerProperty(pIod, pSrcIod, "audioProfileLevelId");
	CloneIntegerProperty(pIod, pSrcIod, "visualProfileLevelId");
	CloneIntegerProperty(pIod, pSrcIod, "graphicsProfileLevelId");

	// mutate esIds from MP4ESIDIncDescrTag to MP4ESDescrTag
	MP4DescriptorProperty* pEsProperty;
	pIod->FindProperty("esIds", (MP4Property**)&pEsProperty);
	pEsProperty->SetTags(MP4ESDescrTag);

	MP4IntegerProperty* pSetProperty;
	MP4IntegerProperty* pSceneESID;
	MP4IntegerProperty* pOdESID;

	// OD
	MP4Descriptor* pOdEsd =
		pEsProperty->AddDescriptor(MP4ESDescrTag);
	pOdEsd->Generate();

	pOdEsd->FindProperty("ESID", 
		(MP4Property**)&pOdESID);

	// we set the OD ESID to a non-zero unique value
	pOdESID->SetValue(m_odTrackId);

	pOdEsd->FindProperty("URLFlag", 
		(MP4Property**)&pSetProperty);
	pSetProperty->SetValue(1);

	u_int8_t* pBytes;
	u_int64_t numBytes;

	CreateIsmaODUpdateCommandFromFileForStream(
		audioTrackId, 
		videoTrackId,
		&pBytes, 
		&numBytes);

	VERBOSE_ISMA(GetVerbosity(),
		printf("OD data =\n"); MP4HexDump(pBytes, numBytes));

	char* odCmdBase64 = MP4ToBase64(pBytes, numBytes);

	char* urlBuf = (char*)MP4Malloc(strlen(odCmdBase64) + 64);

	sprintf(urlBuf, 
		"data:application/mpeg4-od-au;base64,%s",
		odCmdBase64);

	MP4StringProperty* pUrlProperty;
	pOdEsd->FindProperty("URL", 
		(MP4Property**)&pUrlProperty);
	pUrlProperty->SetValue(urlBuf);

	VERBOSE_ISMA(GetVerbosity(),
		printf("OD data URL = \042%s\042\n", urlBuf));

	MP4Free(odCmdBase64);
	odCmdBase64 = NULL;
	MP4Free(pBytes);
	pBytes = NULL;
	MP4Free(urlBuf);
	urlBuf = NULL;

	MP4DescriptorProperty* pSrcDcd = NULL;

	// HACK temporarily point to scene decoder config
	FindProperty(MakeTrackName(odTrackId, 
		"mdia.minf.stbl.stsd.mp4s.esds.decConfigDescr"),
		(MP4Property**)&pSrcDcd);
	ASSERT(pSrcDcd);
	MP4Property* pOrgOdEsdProperty = 
		pOdEsd->GetProperty(8);
	pOdEsd->SetProperty(8, pSrcDcd);

	// bufferSizeDB needs to be set appropriately
	MP4BitfieldProperty* pBufferSizeProperty = NULL;
	pOdEsd->FindProperty("decConfigDescr.bufferSizeDB",
		(MP4Property**)&pBufferSizeProperty);
	ASSERT(pBufferSizeProperty);
	pBufferSizeProperty->SetValue(numBytes);

	// SL config needs to change from 2 (file) to 1 (null)
	pOdEsd->FindProperty("slConfigDescr.predefined", 
		(MP4Property**)&pSetProperty);
	pSetProperty->SetValue(1);


	// Scene
	MP4Descriptor* pSceneEsd =
		pEsProperty->AddDescriptor(MP4ESDescrTag);
	pSceneEsd->Generate();

	pSceneEsd->FindProperty("ESID", 
		(MP4Property**)&pSceneESID);
	// we set the Scene ESID to a non-zero unique value
	pSceneESID->SetValue(sceneTrackId);

	pSceneEsd->FindProperty("URLFlag", 
		(MP4Property**)&pSetProperty);
	pSetProperty->SetValue(1);

	CreateIsmaSceneCommand(
		MP4_IS_VALID_TRACK_ID(audioTrackId), 
		MP4_IS_VALID_TRACK_ID(videoTrackId),
		&pBytes, 
		&numBytes);

	VERBOSE_ISMA(GetVerbosity(),
		printf("Scene data =\n"); MP4HexDump(pBytes, numBytes));

	char *sceneCmdBase64 = MP4ToBase64(pBytes, numBytes);

	urlBuf = (char*)MP4Malloc(strlen(sceneCmdBase64) + 64);
	sprintf(urlBuf, 
		"data:application/mpeg4-bifs-au;base64,%s",
		sceneCmdBase64);

	pSceneEsd->FindProperty("URL", 
		(MP4Property**)&pUrlProperty);
	pUrlProperty->SetValue(urlBuf);

	VERBOSE_ISMA(GetVerbosity(),
		printf("Scene data URL = \042%s\042\n", urlBuf));

	MP4Free(sceneCmdBase64);
	sceneCmdBase64 = NULL;
	MP4Free(urlBuf);
	urlBuf = NULL;
	MP4Free(pBytes);
	pBytes = NULL;

	// HACK temporarily point to scene decoder config
	FindProperty(MakeTrackName(sceneTrackId, 
		"mdia.minf.stbl.stsd.mp4s.esds.decConfigDescr"),
		(MP4Property**)&pSrcDcd);
	ASSERT(pSrcDcd);
	MP4Property* pOrgSceneEsdProperty = 
		pSceneEsd->GetProperty(8);
	pSceneEsd->SetProperty(8, pSrcDcd);

	// bufferSizeDB needs to be set
	pBufferSizeProperty = NULL;
	pSceneEsd->FindProperty("decConfigDescr.bufferSizeDB",
		(MP4Property**)&pBufferSizeProperty);
	ASSERT(pBufferSizeProperty);
	pBufferSizeProperty->SetValue(numBytes);

	// SL config needs to change from 2 (file) to 1 (null)
	pSceneEsd->FindProperty("slConfigDescr.predefined", 
		(MP4Property**)&pSetProperty);
	pSetProperty->SetValue(1);


	// finally get the whole thing written to a memory 
	pIod->WriteToMemory(this, ppBytes, pNumBytes);


	// now carefully replace esd properties before destroying
	pOdEsd->SetProperty(8, pOrgOdEsdProperty);
	pSceneEsd->SetProperty(8, pOrgSceneEsdProperty);
	pSceneESID->SetValue(0); // restore 0 value
	pOdESID->SetValue(0);

	delete pIod;

	VERBOSE_ISMA(GetVerbosity(),
		printf("IOD data =\n"); MP4HexDump(*ppBytes, *pNumBytes));
}

void MP4File::CreateIsmaIodFromParams(
	u_int8_t videoProfile,
	u_int32_t videoBitrate,
	u_int8_t* videoConfig,
	u_int32_t videoConfigLength,
	u_int8_t audioProfile,
	u_int32_t audioBitrate,
	u_int8_t* audioConfig,
	u_int32_t audioConfigLength,
	u_int8_t** ppIodBytes,
	u_int64_t* pIodNumBytes)
{
	MP4IntegerProperty* pInt;
	u_int8_t* pBytes = NULL;
	u_int64_t numBytes;

	// Create the IOD
	MP4Descriptor* pIod = new MP4IODescriptor();
	pIod->SetTag(MP4IODescrTag);
	pIod->Generate();
	
	// Set audio and video profileLevels
	pIod->FindProperty("audioProfileLevelId", 
		(MP4Property**)&pInt);
	pInt->SetValue(audioProfile);

	pIod->FindProperty("visualProfileLevelId", 
		(MP4Property**)&pInt);
	pInt->SetValue(videoProfile);

	// Mutate esIds from MP4ESIDIncDescrTag to MP4ESDescrTag
	MP4DescriptorProperty* pEsProperty;
	pIod->FindProperty("esIds", (MP4Property**)&pEsProperty);
	pEsProperty->SetTags(MP4ESDescrTag);

	// Add ES Descriptors

	// Scene
	CreateIsmaSceneCommand(
		(audioProfile != 0xFF),
		(videoProfile != 0xFF),
		&pBytes, 
		&numBytes);

	VERBOSE_ISMA(GetVerbosity(),
		printf("Scene data =\n"); MP4HexDump(pBytes, numBytes));

	char* sceneCmdBase64 = MP4ToBase64(pBytes, numBytes);

	char* urlBuf = 
		(char*)MP4Malloc(strlen(sceneCmdBase64) + 64);
	sprintf(urlBuf, 
		"data:application/mpeg4-bifs-au;base64,%s",
		sceneCmdBase64);

	VERBOSE_ISMA(GetVerbosity(),
		printf("Scene data URL = \042%s\042\n", urlBuf));

	/* MP4Descriptor* pSceneEsd = */
		CreateESD(
			pEsProperty,
			201,				// esid
			MP4SystemsV2ObjectType,
			MP4SceneDescriptionStreamType,
			numBytes,			// bufferSize
			numBytes * 8,		// bitrate
			BifsV2Config,
			sizeof(BifsV2Config),
			urlBuf);

	MP4Free(sceneCmdBase64);
	sceneCmdBase64 = NULL;
	MP4Free(urlBuf);
	urlBuf = NULL;
	MP4Free(pBytes);
	pBytes = NULL;

    // OD
    
	// Video
	MP4DescriptorProperty* pVideoEsdProperty =