obs-studio/plugins/obs-outputs/librtmp/amf.c

/*
 *      Copyright (C) 2005-2008 Team XBMC
 *      http://www.xbmc.org
 *      Copyright (C) 2008-2009 Andrej Stepanchuk
 *      Copyright (C) 2009-2010 Howard Chu
 *
 *  This file is part of librtmp.
 *
 *  librtmp is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as
 *  published by the Free Software Foundation; either version 2.1,
 *  or (at your option) any later version.
 *
 *  librtmp is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with librtmp see the file COPYING.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA  02110-1301, USA.
 *  http://www.gnu.org/copyleft/lgpl.html
 */

#include "rtmp_sys.h"
#include "amf.h"
#include "log.h"
#include "bytes.h"

static const AMFObjectProperty AMFProp_Invalid = { {0, 0}, AMF_INVALID };
static const AVal AV_empty = { 0, 0 };

/* Data is Big-Endian */
unsigned short
AMF_DecodeInt16(const char *data)
{
    unsigned char *c = (unsigned char *) data;
    unsigned short val;
    val = (c[0] << 8) | c[1];
    return val;
}

unsigned int
AMF_DecodeInt24(const char *data)
{
    unsigned char *c = (unsigned char *) data;
    unsigned int val;
    val = (c[0] << 16) | (c[1] << 8) | c[2];
    return val;
}

unsigned int
AMF_DecodeInt32(const char *data)
{
    unsigned char *c = (unsigned char *)data;
    unsigned int val;
    val = (c[0] << 24) | (c[1] << 16) | (c[2] << 8) | c[3];
    return val;
}

void
AMF_DecodeString(const char *data, AVal *bv)
{
    bv->av_len = AMF_DecodeInt16(data);
    bv->av_val = (bv->av_len > 0) ? (char *)data + 2 : NULL;
}

void
AMF_DecodeLongString(const char *data, AVal *bv)
{
    bv->av_len = AMF_DecodeInt32(data);
    bv->av_val = (bv->av_len > 0) ? (char *)data + 4 : NULL;
}

double
AMF_DecodeNumber(const char *data)
{
    double dVal;
#if __FLOAT_WORD_ORDER == __BYTE_ORDER
#if __BYTE_ORDER == __BIG_ENDIAN
    memcpy(&dVal, data, 8);
#elif __BYTE_ORDER == __LITTLE_ENDIAN
    unsigned char *ci, *co;
    ci = (unsigned char *)data;
    co = (unsigned char *)&dVal;
    co[0] = ci[7];
    co[1] = ci[6];
    co[2] = ci[5];
    co[3] = ci[4];
    co[4] = ci[3];
    co[5] = ci[2];
    co[6] = ci[1];
    co[7] = ci[0];
#endif
#else
#if __BYTE_ORDER == __LITTLE_ENDIAN	/* __FLOAT_WORD_ORER == __BIG_ENDIAN */
    unsigned char *ci, *co;
    ci = (unsigned char *)data;
    co = (unsigned char *)&dVal;
    co[0] = ci[3];
    co[1] = ci[2];
    co[2] = ci[1];
    co[3] = ci[0];
    co[4] = ci[7];
    co[5] = ci[6];
    co[6] = ci[5];
    co[7] = ci[4];
#else /* __BYTE_ORDER == __BIG_ENDIAN && __FLOAT_WORD_ORER == __LITTLE_ENDIAN */
    unsigned char *ci, *co;
    ci = (unsigned char *)data;
    co = (unsigned char *)&dVal;
    co[0] = ci[4];
    co[1] = ci[5];
    co[2] = ci[6];
    co[3] = ci[7];
    co[4] = ci[0];
    co[5] = ci[1];
    co[6] = ci[2];
    co[7] = ci[3];
#endif
#endif
    return dVal;
}

int
AMF_DecodeBoolean(const char *data)
{
    return *data != 0;
}

char *
AMF_EncodeInt16(char *output, char *outend, short nVal)
{
    if (output+2 > outend)
        return NULL;

    output[1] = nVal & 0xff;
    output[0] = nVal >> 8;
    return output+2;
}

char *
AMF_EncodeInt24(char *output, char *outend, int nVal)
{
    if (output+3 > outend)
        return NULL;

    output[2] = nVal & 0xff;
    output[1] = nVal >> 8;
    output[0] = nVal >> 16;
    return output+3;
}

char *
AMF_EncodeInt32(char *output, char *outend, int nVal)
{
    if (output+4 > outend)
        return NULL;

    output[3] = nVal & 0xff;
    output[2] = nVal >> 8;
    output[1] = nVal >> 16;
    output[0] = nVal >> 24;
    return output+4;
}

char *
AMF_EncodeString(char *output, char *outend, const AVal *bv)
{
    if ((bv->av_len < 65536 && output + 1 + 2 + bv->av_len > outend) ||
            output + 1 + 4 + bv->av_len > outend)
        return NULL;

    if (bv->av_len < 65536)
    {
        *output++ = AMF_STRING;

        output = AMF_EncodeInt16(output, outend, bv->av_len);
    }
    else
    {
        *output++ = AMF_LONG_STRING;

        output = AMF_EncodeInt32(output, outend, bv->av_len);
    }
    memcpy(output, bv->av_val, bv->av_len);
    output += bv->av_len;

    return output;
}

char *
AMF_EncodeNumber(char *output, char *outend, double dVal)
{
    if (output+1+8 > outend)
        return NULL;

    *output++ = AMF_NUMBER;	/* type: Number */

#if __FLOAT_WORD_ORDER == __BYTE_ORDER
#if __BYTE_ORDER == __BIG_ENDIAN
    memcpy(output, &dVal, 8);
#elif __BYTE_ORDER == __LITTLE_ENDIAN
    {
        unsigned char *ci, *co;
        ci = (unsigned char *)&dVal;
        co = (unsigned char *)output;
        co[0] = ci[7];
        co[1] = ci[6];
        co[2] = ci[5];
        co[3] = ci[4];
        co[4] = ci[3];
        co[5] = ci[2];
        co[6] = ci[1];
        co[7] = ci[0];
    }
#endif
#else
#if __BYTE_ORDER == __LITTLE_ENDIAN	/* __FLOAT_WORD_ORER == __BIG_ENDIAN */
    {
        unsigned char *ci, *co;
        ci = (unsigned char *)&dVal;
        co = (unsigned char *)output;
        co[0] = ci[3];
        co[1] = ci[2];
        co[2] = ci[1];
        co[3] = ci[0];
        co[4] = ci[7];
        co[5] = ci[6];
        co[6] = ci[5];
        co[7] = ci[4];
    }
#else /* __BYTE_ORDER == __BIG_ENDIAN && __FLOAT_WORD_ORER == __LITTLE_ENDIAN */
    {
        unsigned char *ci, *co;
        ci = (unsigned char *)&dVal;
        co = (unsigned char *)output;
        co[0] = ci[4];
        co[1] = ci[5];
        co[2] = ci[6];
        co[3] = ci[7];
        co[4] = ci[0];
        co[5] = ci[1];
        co[6] = ci[2];
        co[7] = ci[3];
    }
#endif
#endif

    return output+8;
}

char *
AMF_EncodeBoolean(char *output, char *outend, int bVal)
{
    if (output+2 > outend)
        return NULL;

    *output++ = AMF_BOOLEAN;

    *output++ = bVal ? 0x01 : 0x00;

    return output;
}

char *
AMF_EncodeNamedString(char *output, char *outend, const AVal *strName, const AVal *strValue)
{
    if (output+2+strName->av_len > outend)
        return NULL;
    output = AMF_EncodeInt16(output, outend, strName->av_len);

    memcpy(output, strName->av_val, strName->av_len);
    output += strName->av_len;

    return AMF_EncodeString(output, outend, strValue);
}

char *
AMF_EncodeNamedNumber(char *output, char *outend, const AVal *strName, double dVal)
{
    if (output+2+strName->av_len > outend)
        return NULL;
    output = AMF_EncodeInt16(output, outend, strName->av_len);

    memcpy(output, strName->av_val, strName->av_len);
    output += strName->av_len;

    return AMF_EncodeNumber(output, outend, dVal);
}

char *
AMF_EncodeNamedBoolean(char *output, char *outend, const AVal *strName, int bVal)
{
    if (output+2+strName->av_len > outend)
        return NULL;
    output = AMF_EncodeInt16(output, outend, strName->av_len);

    memcpy(output, strName->av_val, strName->av_len);
    output += strName->av_len;

    return AMF_EncodeBoolean(output, outend, bVal);
}

void
AMFProp_GetName(AMFObjectProperty *prop, AVal *name)
{
    *name = prop->p_name;
}

void
AMFProp_SetName(AMFObjectProperty *prop, AVal *name)
{
    prop->p_name = *name;
}

AMFDataType
AMFProp_GetType(AMFObjectProperty *prop)
{
    return prop->p_type;
}

double
AMFProp_GetNumber(AMFObjectProperty *prop)
{
    return prop->p_vu.p_number;
}

int
AMFProp_GetBoolean(AMFObjectProperty *prop)
{
    return prop->p_vu.p_number != 0;
}

void
AMFProp_GetString(AMFObjectProperty *prop, AVal *str)
{
    *str = prop->p_vu.p_aval;
}

void
AMFProp_GetObject(AMFObjectProperty *prop, AMFObject *obj)
{
    *obj = prop->p_vu.p_object;
}

int
AMFProp_IsValid(AMFObjectProperty *prop)
{
    return prop->p_type != AMF_INVALID;
}

char *
AMFProp_Encode(AMFObjectProperty *prop, char *pBuffer, char *pBufEnd)
{
    if (prop->p_type == AMF_INVALID)
        return NULL;

    if (prop->p_type != AMF_NULL && pBuffer + prop->p_name.av_len + 2 + 1 >= pBufEnd)
        return NULL;

    if (prop->p_type != AMF_NULL && prop->p_name.av_len)
    {
        *pBuffer++ = prop->p_name.av_len >> 8;
        *pBuffer++ = prop->p_name.av_len & 0xff;
        memcpy(pBuffer, prop->p_name.av_val, prop->p_name.av_len);
        pBuffer += prop->p_name.av_len;
    }

    switch (prop->p_type)
    {
    case AMF_NUMBER:
        pBuffer = AMF_EncodeNumber(pBuffer, pBufEnd, prop->p_vu.p_number);
        break;

    case AMF_BOOLEAN:
        pBuffer = AMF_EncodeBoolean(pBuffer, pBufEnd, prop->p_vu.p_number != 0);
        break;

    case AMF_STRING:
        pBuffer = AMF_EncodeString(pBuffer, pBufEnd, &prop->p_vu.p_aval);
        break;

    case AMF_NULL:
        if (pBuffer+1 >= pBufEnd)
            return NULL;
        *pBuffer++ = AMF_NULL;
        break;

    case AMF_OBJECT:
        pBuffer = AMF_Encode(&prop->p_vu.p_object, pBuffer, pBufEnd);
        break;

    case AMF_ECMA_ARRAY:
        pBuffer = AMF_EncodeEcmaArray(&prop->p_vu.p_object, pBuffer, pBufEnd);
        break;

    case AMF_STRICT_ARRAY:
        pBuffer = AMF_EncodeArray(&prop->p_vu.p_object, pBuffer, pBufEnd);
        break;

    default:
        RTMP_Log(RTMP_LOGERROR, "%s, invalid type. %d", __FUNCTION__, prop->p_type);
        pBuffer = NULL;
    };

    return pBuffer;
}

#define AMF3_INTEGER_MAX	268435455
#define AMF3_INTEGER_MIN	-268435456

int
AMF3ReadInteger(const char *data, int32_t *valp)
{
    int i = 0;
    int32_t val = 0;

    while (i <= 2)
    {
        /* handle first 3 bytes */
        if (data[i] & 0x80)
        {
            /* byte used */
            val <<= 7;		/* shift up */
            val |= (data[i] & 0x7f);	/* add bits */
            i++;
        }
        else
        {
            break;
        }
    }

    if (i > 2)
    {
        /* use 4th byte, all 8bits */
        val <<= 8;
        val |= data[3];

        /* range check */
        if (val > AMF3_INTEGER_MAX)
            val -= (1 << 29);
    }
    else
    {
        /* use 7bits of last unparsed byte (0xxxxxxx) */
        val <<= 7;
        val |= data[i];
    }

    *valp = val;

    return i > 2 ? 4 : i + 1;
}

int
AMF3ReadString(const char *data, AVal *str)
{
    int32_t ref = 0;
    int len;
    assert(str != 0);

    len = AMF3ReadInteger(data, &ref);
    data += len;

    if ((ref & 0x1) == 0)
    {
        /* reference: 0xxx */
        uint32_t refIndex = (ref >> 1);
        RTMP_Log(RTMP_LOGDEBUG,
                 "%s, string reference, index: %d, not supported, ignoring!",
                 __FUNCTION__, refIndex);
        return len;
    }
    else
    {
        uint32_t nSize = (ref >> 1);

        str->av_val = (char *)data;
        str->av_len = nSize;

        return len + nSize;
    }
    return len;
}

int
AMF3Prop_Decode(AMFObjectProperty *prop, const char *pBuffer, int nSize,
                int bDecodeName)
{
    int nOriginalSize = nSize;
    AMF3DataType type;

    prop->p_name.av_len = 0;
    prop->p_name.av_val = NULL;

    if (nSize == 0 || !pBuffer)
    {
        RTMP_Log(RTMP_LOGDEBUG, "empty buffer/no buffer pointer!");
        return -1;
    }

    /* decode name */
    if (bDecodeName)
    {
        AVal name = AV_empty;
        int nRes = AMF3ReadString(pBuffer, &name);

        if (name.av_len <= 0)
            return nRes;

        prop->p_name = name;
        pBuffer += nRes;
        nSize -= nRes;
    }

    /* decode */
    type = *pBuffer++;
    nSize--;

    switch (type)
    {
    case AMF3_UNDEFINED:
    case AMF3_NULL:
        prop->p_type = AMF_NULL;
        break;
    case AMF3_FALSE:
        prop->p_type = AMF_BOOLEAN;
        prop->p_vu.p_number = 0.0;
        break;
    case AMF3_TRUE:
        prop->p_type = AMF_BOOLEAN;
        prop->p_vu.p_number = 1.0;
        break;
    case AMF3_INTEGER:
    {
        int32_t res = 0;
        int len = AMF3ReadInteger(pBuffer, &res);
        prop->p_vu.p_number = (double)res;
        prop->p_type = AMF_NUMBER;
        nSize -= len;
        break;
    }
    case AMF3_DOUBLE:
        if (nSize < 8)
            return -1;
        prop->p_vu.p_number = AMF_DecodeNumber(pBuffer);
        prop->p_type = AMF_NUMBER;
        nSize -= 8;
        break;
    case AMF3_STRING:
    case AMF3_XML_DOC:
    case AMF3_XML:
    {
        int len = AMF3ReadString(pBuffer, &prop->p_vu.p_aval);
        prop->p_type = AMF_STRING;
        nSize -= len;
        break;
    }
    case AMF3_DATE:
    {
        int32_t res = 0;
        int len = AMF3ReadInteger(pBuffer, &res);

        nSize -= len;
        pBuffer += len;

        if ((res & 0x1) == 0)
        {
            /* reference */
            uint32_t nIndex = (res >> 1);
            RTMP_Log(RTMP_LOGDEBUG, "AMF3_DATE reference: %d, not supported!", nIndex);
        }
        else
        {
            if (nSize < 8)
                return -1;

            prop->p_vu.p_number = AMF_DecodeNumber(pBuffer);
            nSize -= 8;
            prop->p_type = AMF_NUMBER;
        }
        break;
    }
    case AMF3_OBJECT:
    {
        int nRes = AMF3_Decode(&prop->p_vu.p_object, pBuffer, nSize, TRUE);
        if (nRes == -1)
            return -1;
        nSize -= nRes;
        prop->p_type = AMF_OBJECT;
        break;
    }
    case AMF3_ARRAY:
    case AMF3_BYTE_ARRAY:
    default:
        RTMP_Log(RTMP_LOGDEBUG, "%s - AMF3 unknown/unsupported datatype 0x%02x, @%p",
                 __FUNCTION__, (unsigned char)(*pBuffer), pBuffer);
        return -1;
    }

    return nOriginalSize - nSize;
}

int
AMFProp_Decode(AMFObjectProperty *prop, const char *pBuffer, int nSize,
               int bDecodeName)
{
    int nOriginalSize = nSize;
    int nRes;

    prop->p_name.av_len = 0;
    prop->p_name.av_val = NULL;

    if (nSize == 0 || !pBuffer)
    {
        RTMP_Log(RTMP_LOGDEBUG, "%s: Empty buffer/no buffer pointer!", __FUNCTION__);
        return -1;
    }

    if (bDecodeName && nSize < 4)
    {
        /* at least name (length + at least 1 byte) and 1 byte of data */
        RTMP_Log(RTMP_LOGDEBUG,
                 "%s: Not enough data for decoding with name, less than 4 bytes!",
                 __FUNCTION__);
        return -1;
    }

    if (bDecodeName)
    {
        unsigned short nNameSize = AMF_DecodeInt16(pBuffer);
        if (nNameSize > nSize - 2)
        {
            RTMP_Log(RTMP_LOGDEBUG,
                     "%s: Name size out of range: namesize (%d) > len (%d) - 2",
                     __FUNCTION__, nNameSize, nSize);
            return -1;
        }

        AMF_DecodeString(pBuffer, &prop->p_name);
        nSize -= 2 + nNameSize;
        pBuffer += 2 + nNameSize;
    }

    if (nSize == 0)
    {
        return -1;
    }

    nSize--;

    prop->p_type = *pBuffer++;
    switch (prop->p_type)
    {
    case AMF_NUMBER:
        if (nSize < 8)
            return -1;
        prop->p_vu.p_number = AMF_DecodeNumber(pBuffer);
        nSize -= 8;
        break;
    case AMF_BOOLEAN:
        if (nSize < 1)
            return -1;
        prop->p_vu.p_number = (double)AMF_DecodeBoolean(pBuffer);
        nSize--;
        break;
    case AMF_STRING:
    {
        unsigned short nStringSize = AMF_DecodeInt16(pBuffer);

        if (nSize < (long)nStringSize + 2)
            return -1;
        AMF_DecodeString(pBuffer, &prop->p_vu.p_aval);
        nSize -= (2 + nStringSize);
        break;
    }
    case AMF_OBJECT:
    {
        int nRes = AMF_Decode(&prop->p_vu.p_object, pBuffer, nSize, TRUE);
        if (nRes == -1)
            return -1;
        nSize -= nRes;
        break;
    }
    case AMF_MOVIECLIP:
    {
        RTMP_Log(RTMP_LOGERROR, "AMF_MOVIECLIP reserved!");
        return -1;
        break;
    }
    case AMF_NULL:
    case AMF_UNDEFINED:
    case AMF_UNSUPPORTED:
        prop->p_type = AMF_NULL;
        break;
    case AMF_REFERENCE:
    {
        RTMP_Log(RTMP_LOGERROR, "AMF_REFERENCE not supported!");
        return -1;
        break;
    }
    case AMF_ECMA_ARRAY:
    {
        nSize -= 4;

        /* next comes the rest, mixed array has a final 0x000009 mark and names, so its an object */
        nRes = AMF_Decode(&prop->p_vu.p_object, pBuffer + 4, nSize, TRUE);
        if (nRes == -1)
            return -1;
        nSize -= nRes;
        break;
    }
    case AMF_OBJECT_END:
    {
        return -1;
        break;
    }
    case AMF_STRICT_ARRAY:
    {
        unsigned int nArrayLen = AMF_DecodeInt32(pBuffer);
        nSize -= 4;

        nRes = AMF_DecodeArray(&prop->p_vu.p_object, pBuffer + 4, nSize,
                               nArrayLen, FALSE);
        if (nRes == -1)
            return -1;
        nSize -= nRes;
        break;
    }
    case AMF_DATE:
    {
        RTMP_Log(RTMP_LOGDEBUG, "AMF_DATE");

        if (nSize < 10)
            return -1;

        prop->p_vu.p_number = AMF_DecodeNumber(pBuffer);
        prop->p_UTCoffset = AMF_DecodeInt16(pBuffer + 8);

        nSize -= 10;
        break;
    }
    case AMF_LONG_STRING:
    case AMF_XML_DOC:
    {
        unsigned int nStringSize = AMF_DecodeInt32(pBuffer);
        if (nSize < (long)nStringSize + 4)
            return -1;
        AMF_DecodeLongString(pBuffer, &prop->p_vu.p_aval);
        nSize -= (4 + nStringSize);
        if (prop->p_type == AMF_LONG_STRING)
            prop->p_type = AMF_STRING;
        break;
    }
    case AMF_RECORDSET:
    {
        RTMP_Log(RTMP_LOGERROR, "AMF_RECORDSET reserved!");
        return -1;
        break;
    }
    case AMF_TYPED_OBJECT:
    {
        RTMP_Log(RTMP_LOGERROR, "AMF_TYPED_OBJECT not supported!");
        return -1;
        break;
    }
    case AMF_AVMPLUS:
    {
        int nRes = AMF3_Decode(&prop->p_vu.p_object, pBuffer, nSize, TRUE);
        if (nRes == -1)
            return -1;
        nSize -= nRes;
        prop->p_type = AMF_OBJECT;
        break;
    }
    default:
        RTMP_Log(RTMP_LOGDEBUG, "%s - unknown datatype 0x%02x, @%p", __FUNCTION__,
                 prop->p_type, pBuffer - 1);
        return -1;
    }

    return nOriginalSize - nSize;
}

void
AMFProp_Dump(AMFObjectProperty *prop)
{
    char strRes[256];
    char str[256];
    AVal name;

    if (prop->p_type == AMF_INVALID)
    {
        RTMP_Log(RTMP_LOGDEBUG, "Property: INVALID");
        return;
    }

    if (prop->p_type == AMF_NULL)
    {
        RTMP_Log(RTMP_LOGDEBUG, "Property: NULL");
        return;
    }

    if (prop->p_name.av_len)
    {
        name = prop->p_name;
    }
    else
    {
        name.av_val = "no-name.";
        name.av_len = sizeof("no-name.") - 1;
    }
    if (name.av_len > 18)
        name.av_len = 18;

    snprintf(strRes, 255, "Name: %18.*s, ", name.av_len, name.av_val);

    if (prop->p_type == AMF_OBJECT)
    {
        RTMP_Log(RTMP_LOGDEBUG, "Property: <%sOBJECT>", strRes);
        AMF_Dump(&prop->p_vu.p_object);
        return;
    }
    else if (prop->p_type == AMF_ECMA_ARRAY)
    {
        RTMP_Log(RTMP_LOGDEBUG, "Property: <%sECMA_ARRAY>", strRes);
        AMF_Dump(&prop->p_vu.p_object);
        return;
    }
    else if (prop->p_type == AMF_STRICT_ARRAY)
    {
        RTMP_Log(RTMP_LOGDEBUG, "Property: <%sSTRICT_ARRAY>", strRes);
        AMF_Dump(&prop->p_vu.p_object);
        return;
    }

    switch (prop->p_type)
    {
    case AMF_NUMBER:
        snprintf(str, 255, "NUMBER:\t%.2f", prop->p_vu.p_number);
        break;
    case AMF_BOOLEAN:
        snprintf(str, 255, "BOOLEAN:\t%s",
                 prop->p_vu.p_number != 0.0 ? "TRUE" : "FALSE");
        break;
    case AMF_STRING:
        snprintf(str, 255, "STRING:\t%.*s", prop->p_vu.p_aval.av_len,
                 prop->p_vu.p_aval.av_val);
        break;
    case AMF_DATE:
        snprintf(str, 255, "DATE:\ttimestamp: %.2f, UTC offset: %d",
                 prop->p_vu.p_number, prop->p_UTCoffset);
        break;
    default:
        snprintf(str, 255, "INVALID TYPE 0x%02x", (unsigned char)prop->p_type);
    }

    RTMP_Log(RTMP_LOGDEBUG, "Property: <%s%s>", strRes, str);
}

void
AMFProp_Reset(AMFObjectProperty *prop)
{
    if (prop->p_type == AMF_OBJECT || prop->p_type == AMF_ECMA_ARRAY || prop->p_type == AMF_STRICT_ARRAY)
        AMF_Reset(&prop->p_vu.p_object);
    else
    {
        prop->p_vu.p_aval.av_len = 0;
        prop->p_vu.p_aval.av_val = NULL;
    }
    prop->p_type = AMF_INVALID;
}

/* AMFObject */

char *
AMF_Encode(AMFObject *obj, char *pBuffer, char *pBufEnd)
{
    int i;

    if (pBuffer+4 >= pBufEnd)
        return NULL;

    *pBuffer++ = AMF_OBJECT;

    for (i = 0; i < obj->o_num; i++)
    {
        char *res = AMFProp_Encode(&obj->o_props[i], pBuffer, pBufEnd);
        if (res == NULL)
        {
            RTMP_Log(RTMP_LOGERROR, "AMF_Encode - failed to encode property in index %d",
                     i);
            break;
        }
        else
        {
            pBuffer = res;
        }
    }

    if (pBuffer + 3 >= pBufEnd)
        return NULL;			/* no room for the end marker */

    pBuffer = AMF_EncodeInt24(pBuffer, pBufEnd, AMF_OBJECT_END);

    return pBuffer;
}

char *
AMF_EncodeEcmaArray(AMFObject *obj, char *pBuffer, char *pBufEnd)
{
    int i;

    if (pBuffer+4 >= pBufEnd)
        return NULL;

    *pBuffer++ = AMF_ECMA_ARRAY;

    pBuffer = AMF_EncodeInt32(pBuffer, pBufEnd, obj->o_num);

    for (i = 0; i < obj->o_num; i++)
    {
        char *res = AMFProp_Encode(&obj->o_props[i], pBuffer, pBufEnd);
        if (res == NULL)
        {
            RTMP_Log(RTMP_LOGERROR, "AMF_Encode - failed to encode property in index %d",
                     i);
            break;
        }
        else
        {
            pBuffer = res;
        }
    }

    if (pBuffer + 3 >= pBufEnd)
        return NULL;			/* no room for the end marker */

    pBuffer = AMF_EncodeInt24(pBuffer, pBufEnd, AMF_OBJECT_END);

    return pBuffer;
}

char *
AMF_EncodeArray(AMFObject *obj, char *pBuffer, char *pBufEnd)
{
    int i;

    if (pBuffer+4 >= pBufEnd)
        return NULL;

    *pBuffer++ = AMF_STRICT_ARRAY;

    pBuffer = AMF_EncodeInt32(pBuffer, pBufEnd, obj->o_num);

    for (i = 0; i < obj->o_num; i++)
    {
        char *res = AMFProp_Encode(&obj->o_props[i], pBuffer, pBufEnd);
        if (res == NULL)
        {
            RTMP_Log(RTMP_LOGERROR, "AMF_Encode - failed to encode property in index %d",
                     i);
            break;
        }
        else
        {
            pBuffer = res;
        }
    }

    //if (pBuffer + 3 >= pBufEnd)
    //  return NULL;			/* no room for the end marker */

    //pBuffer = AMF_EncodeInt24(pBuffer, pBufEnd, AMF_OBJECT_END);

    return pBuffer;
}

int
AMF_DecodeArray(AMFObject *obj, const char *pBuffer, int nSize,
                int nArrayLen, int bDecodeName)
{
    int nOriginalSize = nSize;
    int bError = FALSE;

    obj->o_num = 0;
    obj->o_props = NULL;
    while (nArrayLen > 0)
    {
        AMFObjectProperty prop;
        int nRes;
        nArrayLen--;

        nRes = AMFProp_Decode(&prop, pBuffer, nSize, bDecodeName);
        if (nRes == -1)
            bError = TRUE;
        else
        {
            nSize -= nRes;
            pBuffer += nRes;
            AMF_AddProp(obj, &prop);
        }
    }
    if (bError)
        return -1;

    return nOriginalSize - nSize;
}

int
AMF3_Decode(AMFObject *obj, const char *pBuffer, int nSize, int bAMFData)
{
    int nOriginalSize = nSize;
    int32_t ref;
    int len;

    obj->o_num = 0;
    obj->o_props = NULL;
    if (bAMFData)
    {
        if (*pBuffer != AMF3_OBJECT)
            RTMP_Log(RTMP_LOGERROR,
                     "AMF3 Object encapsulated in AMF stream does not start with AMF3_OBJECT!");
        pBuffer++;
        nSize--;
    }

    ref = 0;
    len = AMF3ReadInteger(pBuffer, &ref);
    pBuffer += len;
    nSize -= len;

    if ((ref & 1) == 0)
    {
        /* object reference, 0xxx */
        uint32_t objectIndex = (ref >> 1);

        RTMP_Log(RTMP_LOGDEBUG, "Object reference, index: %d", objectIndex);
    }
    else				/* object instance */
    {
        int32_t classRef = (ref >> 1);

        AMF3ClassDef cd = { {0, 0}
        };
        AMFObjectProperty prop;

        if ((classRef & 0x1) == 0)
        {
            /* class reference */
            uint32_t classIndex = (classRef >> 1);
            RTMP_Log(RTMP_LOGDEBUG, "Class reference: %d", classIndex);
        }
        else
        {
            int32_t classExtRef = (classRef >> 1);
            int i;

            cd.cd_externalizable = (classExtRef & 0x1) == 1;
            cd.cd_dynamic = ((classExtRef >> 1) & 0x1) == 1;

            cd.cd_num = classExtRef >> 2;

            /* class name */

            len = AMF3ReadString(pBuffer, &cd.cd_name);
            nSize -= len;
            pBuffer += len;

            /*std::string str = className; */

            RTMP_Log(RTMP_LOGDEBUG,
                     "Class name: %s, externalizable: %d, dynamic: %d, classMembers: %d",
                     cd.cd_name.av_val, cd.cd_externalizable, cd.cd_dynamic,
                     cd.cd_num);

            for (i = 0; i < cd.cd_num; i++)
            {
                AVal memberName = AV_empty;
                len = AMF3ReadString(pBuffer, &memberName);
                RTMP_Log(RTMP_LOGDEBUG, "Member: %s", memberName.av_val);
                AMF3CD_AddProp(&cd, &memberName);
                nSize -= len;
                pBuffer += len;
            }
        }

        /* add as referencable object */

        if (cd.cd_externalizable)
        {
            int nRes;
            AVal name = AVC("DEFAULT_ATTRIBUTE");

            RTMP_Log(RTMP_LOGDEBUG, "Externalizable, TODO check");

            nRes = AMF3Prop_Decode(&prop, pBuffer, nSize, FALSE);
            if (nRes == -1)
                RTMP_Log(RTMP_LOGDEBUG, "%s, failed to decode AMF3 property!",
                         __FUNCTION__);
            else
            {
                nSize -= nRes;
                pBuffer += nRes;
            }

            AMFProp_SetName(&prop, &name);
            AMF_AddProp(obj, &prop);
        }
        else
        {
            int nRes, i;
            for (i = 0; i < cd.cd_num; i++)	/* non-dynamic */
            {
                nRes = AMF3Prop_Decode(&prop, pBuffer, nSize, FALSE);
                if (nRes == -1)
                    RTMP_Log(RTMP_LOGDEBUG, "%s, failed to decode AMF3 property!",
                             __FUNCTION__);

                AMFProp_SetName(&prop, AMF3CD_GetProp(&cd, i));
                AMF_AddProp(obj, &prop);

                pBuffer += nRes;
                nSize -= nRes;
            }
            if (cd.cd_dynamic)
            {
                int len = 0;

                do
                {
                    nRes = AMF3Prop_Decode(&prop, pBuffer, nSize, TRUE);
                    AMF_AddProp(obj, &prop);

                    pBuffer += nRes;
                    nSize -= nRes;

                    len = prop.p_name.av_len;
                }
                while (len > 0);
            }
        }
        RTMP_Log(RTMP_LOGDEBUG, "class object!");
    }
    return nOriginalSize - nSize;
}

int
AMF_Decode(AMFObject *obj, const char *pBuffer, int nSize, int bDecodeName)
{
    int nOriginalSize = nSize;
    int bError = FALSE;		/* if there is an error while decoding - try to at least find the end mark AMF_OBJECT_END */

    obj->o_num = 0;
    obj->o_props = NULL;
    while (nSize > 0)
    {
        AMFObjectProperty prop;
        int nRes;

        if (nSize >=3 && AMF_DecodeInt24(pBuffer) == AMF_OBJECT_END)
        {
            nSize -= 3;
            bError = FALSE;
            break;
        }

        if (bError)
        {
            RTMP_Log(RTMP_LOGERROR,
                     "DECODING ERROR, IGNORING BYTES UNTIL NEXT KNOWN PATTERN!");
            nSize--;
            pBuffer++;
            continue;
        }

        nRes = AMFProp_Decode(&prop, pBuffer, nSize, bDecodeName);
        if (nRes == -1)
            bError = TRUE;
        else
        {
            nSize -= nRes;
            pBuffer += nRes;
            AMF_AddProp(obj, &prop);
        }
    }

    if (bError)
        return -1;

    return nOriginalSize - nSize;
}

void
AMF_AddProp(AMFObject *obj, const AMFObjectProperty *prop)
{
    if (!(obj->o_num & 0x0f))
        obj->o_props =
            realloc(obj->o_props, (obj->o_num + 16) * sizeof(AMFObjectProperty));
    memcpy(&obj->o_props[obj->o_num++], prop, sizeof(AMFObjectProperty));
}

int
AMF_CountProp(AMFObject *obj)
{
    return obj->o_num;
}

AMFObjectProperty *
AMF_GetProp(AMFObject *obj, const AVal *name, int nIndex)
{
    if (nIndex >= 0)
    {
        if (nIndex < obj->o_num)
            return &obj->o_props[nIndex];
    }
    else
    {
        int n;
        for (n = 0; n < obj->o_num; n++)
        {
            if (AVMATCH(&obj->o_props[n].p_name, name))
                return &obj->o_props[n];
        }
    }

    return (AMFObjectProperty *)&AMFProp_Invalid;
}

void
AMF_Dump(AMFObject *obj)
{
    int n;
    RTMP_Log(RTMP_LOGDEBUG, "(object begin)");
    for (n = 0; n < obj->o_num; n++)
    {
        AMFProp_Dump(&obj->o_props[n]);
    }
    RTMP_Log(RTMP_LOGDEBUG, "(object end)");
}

void
AMF_Reset(AMFObject *obj)
{
    int n;
    for (n = 0; n < obj->o_num; n++)
    {
        AMFProp_Reset(&obj->o_props[n]);
    }
    free(obj->o_props);
    obj->o_props = NULL;
    obj->o_num = 0;
}


/* AMF3ClassDefinition */

void
AMF3CD_AddProp(AMF3ClassDef *cd, AVal *prop)
{
    if (!(cd->cd_num & 0x0f))
        cd->cd_props = realloc(cd->cd_props, (cd->cd_num + 16) * sizeof(AVal));
    cd->cd_props[cd->cd_num++] = *prop;
}

AVal *
AMF3CD_GetProp(AMF3ClassDef *cd, int nIndex)
{
    if (nIndex >= cd->cd_num)
        return (AVal *)&AV_empty;
    return &cd->cd_props[nIndex];
}