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author | Kristian Høgsberg <krh@bitplanet.net> | 2012-05-25 18:03:52 -0400 |
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committer | Kristian Høgsberg <krh@bitplanet.net> | 2012-05-25 18:03:52 -0400 |
commit | 2bcb2fc1fdda6f261ccbce795b2a81a9b96fc13b (patch) | |
tree | 02dc3801f98b0fa1aa4b9cd2c3bd61f72da64b82 /wcap/EbmlWriter.c | |
parent | b0be6075ca339701837d9bc73e9797c4ca63bc6f (diff) | |
download | weston-2bcb2fc1fdda6f261ccbce795b2a81a9b96fc13b.tar.gz |
wcap: Rename wcap-encode to just wcap
Diffstat (limited to 'wcap/EbmlWriter.c')
-rw-r--r-- | wcap/EbmlWriter.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/wcap/EbmlWriter.c b/wcap/EbmlWriter.c new file mode 100644 index 00000000..fbf2c66e --- /dev/null +++ b/wcap/EbmlWriter.c @@ -0,0 +1,171 @@ +// Copyright (c) 2010 The WebM project authors. All Rights Reserved. +// +// Use of this source code is governed by a BSD-style license +// that can be found in the LICENSE file in the root of the source +// tree. An additional intellectual property rights grant can be found +// in the file PATENTS. All contributing project authors may +// be found in the AUTHORS file in the root of the source tree. + + +#include "EbmlWriter.h" +#include <stdlib.h> +#include <wchar.h> +#include <string.h> +#include <limits.h> +#if defined(_MSC_VER) +#define LITERALU64(n) n +#else +#define LITERALU64(n) n##LLU +#endif + +void Ebml_WriteLen(EbmlGlobal *glob, long long val) +{ + //TODO check and make sure we are not > than 0x0100000000000000LLU + unsigned char size = 8; //size in bytes to output + unsigned long long minVal = LITERALU64(0x00000000000000ff); //mask to compare for byte size + + for (size = 1; size < 8; size ++) + { + if (val < minVal) + break; + + minVal = (minVal << 7); + } + + val |= (LITERALU64(0x000000000000080) << ((size - 1) * 7)); + + Ebml_Serialize(glob, (void *) &val, sizeof(val), size); +} + +void Ebml_WriteString(EbmlGlobal *glob, const char *str) +{ + const size_t size_ = strlen(str); + const unsigned long long size = size_; + Ebml_WriteLen(glob, size); + //TODO: it's not clear from the spec whether the nul terminator + //should be serialized too. For now we omit the null terminator. + Ebml_Write(glob, str, size); +} + +void Ebml_WriteUTF8(EbmlGlobal *glob, const wchar_t *wstr) +{ + const size_t strlen = wcslen(wstr); + + //TODO: it's not clear from the spec whether the nul terminator + //should be serialized too. For now we include it. + const unsigned long long size = strlen; + + Ebml_WriteLen(glob, size); + Ebml_Write(glob, wstr, size); +} + +void Ebml_WriteID(EbmlGlobal *glob, unsigned long class_id) +{ + int len; + + if (class_id >= 0x01000000) + len = 4; + else if (class_id >= 0x00010000) + len = 3; + else if (class_id >= 0x00000100) + len = 2; + else + len = 1; + + Ebml_Serialize(glob, (void *)&class_id, sizeof(class_id), len); +} + +void Ebml_SerializeUnsigned64(EbmlGlobal *glob, unsigned long class_id, uint64_t ui) +{ + unsigned char sizeSerialized = 8 | 0x80; + Ebml_WriteID(glob, class_id); + Ebml_Serialize(glob, &sizeSerialized, sizeof(sizeSerialized), 1); + Ebml_Serialize(glob, &ui, sizeof(ui), 8); +} + +void Ebml_SerializeUnsigned(EbmlGlobal *glob, unsigned long class_id, unsigned long ui) +{ + unsigned char size = 8; //size in bytes to output + unsigned char sizeSerialized = 0; + unsigned long minVal; + + Ebml_WriteID(glob, class_id); + minVal = 0x7fLU; //mask to compare for byte size + + for (size = 1; size < 4; size ++) + { + if (ui < minVal) + { + break; + } + + minVal <<= 7; + } + + sizeSerialized = 0x80 | size; + Ebml_Serialize(glob, &sizeSerialized, sizeof(sizeSerialized), 1); + Ebml_Serialize(glob, &ui, sizeof(ui), size); +} +//TODO: perhaps this is a poor name for this id serializer helper function +void Ebml_SerializeBinary(EbmlGlobal *glob, unsigned long class_id, unsigned long bin) +{ + int size; + for (size=4; size > 1; size--) + { + if (bin & 0x000000ff << ((size-1) * 8)) + break; + } + Ebml_WriteID(glob, class_id); + Ebml_WriteLen(glob, size); + Ebml_WriteID(glob, bin); +} + +void Ebml_SerializeFloat(EbmlGlobal *glob, unsigned long class_id, double d) +{ + unsigned char len = 0x88; + + Ebml_WriteID(glob, class_id); + Ebml_Serialize(glob, &len, sizeof(len), 1); + Ebml_Serialize(glob, &d, sizeof(d), 8); +} + +void Ebml_WriteSigned16(EbmlGlobal *glob, short val) +{ + signed long out = ((val & 0x003FFFFF) | 0x00200000) << 8; + Ebml_Serialize(glob, &out, sizeof(out), 3); +} + +void Ebml_SerializeString(EbmlGlobal *glob, unsigned long class_id, const char *s) +{ + Ebml_WriteID(glob, class_id); + Ebml_WriteString(glob, s); +} + +void Ebml_SerializeUTF8(EbmlGlobal *glob, unsigned long class_id, wchar_t *s) +{ + Ebml_WriteID(glob, class_id); + Ebml_WriteUTF8(glob, s); +} + +void Ebml_SerializeData(EbmlGlobal *glob, unsigned long class_id, unsigned char *data, unsigned long data_length) +{ + Ebml_WriteID(glob, class_id); + Ebml_WriteLen(glob, data_length); + Ebml_Write(glob, data, data_length); +} + +void Ebml_WriteVoid(EbmlGlobal *glob, unsigned long vSize) +{ + unsigned char tmp = 0; + unsigned long i = 0; + + Ebml_WriteID(glob, 0xEC); + Ebml_WriteLen(glob, vSize); + + for (i = 0; i < vSize; i++) + { + Ebml_Write(glob, &tmp, 1); + } +} + +//TODO Serialize Date |