diff options
Diffstat (limited to 'media/libstagefright/timedtext/TextDescriptions.cpp')
| -rw-r--r-- | media/libstagefright/timedtext/TextDescriptions.cpp | 385 |
1 files changed, 385 insertions, 0 deletions
diff --git a/media/libstagefright/timedtext/TextDescriptions.cpp b/media/libstagefright/timedtext/TextDescriptions.cpp new file mode 100644 index 0000000..f9c1fe0 --- /dev/null +++ b/media/libstagefright/timedtext/TextDescriptions.cpp @@ -0,0 +1,385 @@ +/* + * Copyright (C) 2011 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "TextDescriptions.h" +#include <media/stagefright/Utils.h> +#include <media/stagefright/MediaErrors.h> + +namespace android { + +TextDescriptions::TextDescriptions() { +} + +status_t TextDescriptions::getParcelOfDescriptions( + const uint8_t *data, ssize_t size, + uint32_t flags, int timeMs, Parcel *parcel) { + parcel->freeData(); + + if (flags & IN_BAND_TEXT_3GPP) { + if (flags & GLOBAL_DESCRIPTIONS) { + return extract3GPPGlobalDescriptions(data, size, parcel, 0); + } else if (flags & LOCAL_DESCRIPTIONS) { + return extract3GPPLocalDescriptions(data, size, timeMs, parcel, 0); + } + } else if (flags & OUT_OF_BAND_TEXT_SRT) { + if (flags & LOCAL_DESCRIPTIONS) { + return extractSRTLocalDescriptions(data, size, timeMs, parcel); + } + } + + return ERROR_UNSUPPORTED; +} + +// Parse the SRT text sample, and store the timing and text sample in a Parcel. +// The Parcel will be sent to MediaPlayer.java through event, and will be +// parsed in TimedText.java. +status_t TextDescriptions::extractSRTLocalDescriptions( + const uint8_t *data, ssize_t size, int timeMs, Parcel *parcel) { + parcel->writeInt32(KEY_LOCAL_SETTING); + parcel->writeInt32(KEY_START_TIME); + parcel->writeInt32(timeMs); + + parcel->writeInt32(KEY_STRUCT_TEXT); + // write the size of the text sample + parcel->writeInt32(size); + // write the text sample as a byte array + parcel->writeInt32(size); + parcel->write(data, size); + + return OK; +} + +// Extract the local 3GPP display descriptions. 3GPP local descriptions +// are appended to the text sample if any. The descriptions could include +// information such as text styles, highlights, karaoke and so on. They +// are contained in different boxes, such as 'styl' box contains text +// styles, and 'krok' box contains karaoke timing and positions. +status_t TextDescriptions::extract3GPPLocalDescriptions( + const uint8_t *data, ssize_t size, + int timeMs, Parcel *parcel, int depth) { + if (depth == 0) { + parcel->writeInt32(KEY_LOCAL_SETTING); + + // write start time to display this text sample + parcel->writeInt32(KEY_START_TIME); + parcel->writeInt32(timeMs); + + ssize_t textLen = (*data) << 8 | (*(data + 1)); + + // write text sample length and text sample itself + parcel->writeInt32(KEY_STRUCT_TEXT); + parcel->writeInt32(textLen); + parcel->writeInt32(textLen); + parcel->write(data + 2, textLen); + + if (size > textLen) { + data += (textLen + 2); + size -= (textLen + 2); + } else { + return OK; + } + } + + const uint8_t *tmpData = data; + ssize_t chunkSize = U32_AT(tmpData); + uint32_t chunkType = U32_AT(tmpData + 4); + + if (chunkSize <= 0) { + return OK; + } + + tmpData += 8; + + switch(chunkType) { + // 'styl' box specifies the style of the text. + case FOURCC('s', 't', 'y', 'l'): + { + uint16_t count = U16_AT(tmpData); + + tmpData += 2; + + for (int i = 0; i < count; i++) { + parcel->writeInt32(KEY_STRUCT_STYLE_LIST); + parcel->writeInt32(KEY_START_CHAR); + parcel->writeInt32(U16_AT(tmpData)); + + parcel->writeInt32(KEY_END_CHAR); + parcel->writeInt32(U16_AT(tmpData + 2)); + + parcel->writeInt32(KEY_FONT_ID); + parcel->writeInt32(U16_AT(tmpData + 4)); + + parcel->writeInt32(KEY_STYLE_FLAGS); + parcel->writeInt32(*(tmpData + 6)); + + parcel->writeInt32(KEY_FONT_SIZE); + parcel->writeInt32(*(tmpData + 7)); + + parcel->writeInt32(KEY_TEXT_COLOR_RGBA); + uint32_t rgba = *(tmpData + 8) << 24 | *(tmpData + 9) << 16 + | *(tmpData + 10) << 8 | *(tmpData + 11); + parcel->writeInt32(rgba); + + tmpData += 12; + } + + break; + } + // 'krok' box. The number of highlight events is specified, and each + // event is specified by a starting and ending char offset and an end + // time for the event. + case FOURCC('k', 'r', 'o', 'k'): + { + + parcel->writeInt32(KEY_STRUCT_KARAOKE_LIST); + + int startTime = U32_AT(tmpData); + uint16_t count = U16_AT(tmpData + 4); + parcel->writeInt32(count); + + tmpData += 6; + int lastEndTime = 0; + + for (int i = 0; i < count; i++) { + parcel->writeInt32(startTime + lastEndTime); + + lastEndTime = U32_AT(tmpData); + parcel->writeInt32(lastEndTime); + + parcel->writeInt32(U16_AT(tmpData + 4)); + parcel->writeInt32(U16_AT(tmpData + 6)); + + tmpData += 8; + } + + break; + } + // 'hlit' box specifies highlighted text + case FOURCC('h', 'l', 'i', 't'): + { + parcel->writeInt32(KEY_STRUCT_HIGHLIGHT_LIST); + + // the start char offset to highlight + parcel->writeInt32(U16_AT(tmpData)); + // the last char offset to highlight + parcel->writeInt32(U16_AT(tmpData + 2)); + + break; + } + // 'hclr' box specifies the RGBA color: 8 bits each of + // red, green, blue, and an alpha(transparency) value + case FOURCC('h', 'c', 'l', 'r'): + { + parcel->writeInt32(KEY_HIGHLIGHT_COLOR_RGBA); + + uint32_t rgba = *(tmpData) << 24 | *(tmpData + 1) << 16 + | *(tmpData + 2) << 8 | *(tmpData + 3); + parcel->writeInt32(rgba); + + break; + } + // 'dlay' box specifies a delay after a scroll in and/or + // before scroll out. + case FOURCC('d', 'l', 'a', 'y'): + { + parcel->writeInt32(KEY_SCROLL_DELAY); + + uint32_t delay = *(tmpData) << 24 | *(tmpData + 1) << 16 + | *(tmpData + 2) << 8 | *(tmpData + 3); + parcel->writeInt32(delay); + + break; + } + // 'href' box for hyper text link + case FOURCC('h', 'r', 'e', 'f'): + { + parcel->writeInt32(KEY_STRUCT_HYPER_TEXT_LIST); + + // the start offset of the text to be linked + parcel->writeInt32(U16_AT(tmpData)); + // the end offset of the text + parcel->writeInt32(U16_AT(tmpData + 2)); + + // the number of bytes in the following URL + int len = *(tmpData + 4); + parcel->writeInt32(len); + + // the linked-to URL + parcel->writeInt32(len); + parcel->write(tmpData + 5, len); + + tmpData += (5 + len); + + // the number of bytes in the following "alt" string + len = *tmpData; + parcel->writeInt32(len); + + // an "alt" string for user display + parcel->writeInt32(len); + parcel->write(tmpData + 1, len); + + break; + } + // 'tbox' box to indicate the position of the text with values + // of top, left, bottom and right + case FOURCC('t', 'b', 'o', 'x'): + { + parcel->writeInt32(KEY_STRUCT_TEXT_POS); + parcel->writeInt32(U16_AT(tmpData)); + parcel->writeInt32(U16_AT(tmpData + 2)); + parcel->writeInt32(U16_AT(tmpData + 4)); + parcel->writeInt32(U16_AT(tmpData + 6)); + + break; + } + // 'blnk' to specify the char range to be blinked + case FOURCC('b', 'l', 'n', 'k'): + { + parcel->writeInt32(KEY_STRUCT_BLINKING_TEXT_LIST); + + // start char offset + parcel->writeInt32(U16_AT(tmpData)); + // end char offset + parcel->writeInt32(U16_AT(tmpData + 2)); + + break; + } + // 'twrp' box specifies text wrap behavior. If the value if 0x00, + // then no wrap. If it's 0x01, then automatic 'soft' wrap is enabled. + // 0x02-0xff are reserved. + case FOURCC('t', 'w', 'r', 'p'): + { + parcel->writeInt32(KEY_WRAP_TEXT); + parcel->writeInt32(*tmpData); + + break; + } + default: + { + break; + } + } + + if (size > chunkSize) { + data += chunkSize; + size -= chunkSize; + // continue to parse next box + return extract3GPPLocalDescriptions(data, size, 0, parcel, 1); + } + + return OK; +} + +// To extract box 'tx3g' defined in 3GPP TS 26.245, and store it in a Parcel +status_t TextDescriptions::extract3GPPGlobalDescriptions( + const uint8_t *data, ssize_t size, Parcel *parcel, int depth) { + + ssize_t chunkSize = U32_AT(data); + uint32_t chunkType = U32_AT(data + 4); + const uint8_t *tmpData = data; + tmpData += 8; + + if (size < chunkSize) { + return OK; + } + + if (depth == 0) { + parcel->writeInt32(KEY_GLOBAL_SETTING); + } + switch(chunkType) { + case FOURCC('t', 'x', '3', 'g'): + { + tmpData += 8; // skip the first 8 bytes + parcel->writeInt32(KEY_DISPLAY_FLAGS); + parcel->writeInt32(U32_AT(tmpData)); + + parcel->writeInt32(KEY_STRUCT_JUSTIFICATION); + parcel->writeInt32(tmpData[4]); + parcel->writeInt32(tmpData[5]); + + parcel->writeInt32(KEY_BACKGROUND_COLOR_RGBA); + uint32_t rgba = *(tmpData + 6) << 24 | *(tmpData + 7) << 16 + | *(tmpData + 8) << 8 | *(tmpData + 9); + parcel->writeInt32(rgba); + + tmpData += 10; + parcel->writeInt32(KEY_STRUCT_TEXT_POS); + parcel->writeInt32(U16_AT(tmpData)); + parcel->writeInt32(U16_AT(tmpData + 2)); + parcel->writeInt32(U16_AT(tmpData + 4)); + parcel->writeInt32(U16_AT(tmpData + 6)); + + tmpData += 8; + parcel->writeInt32(KEY_STRUCT_STYLE_LIST); + parcel->writeInt32(KEY_START_CHAR); + parcel->writeInt32(U16_AT(tmpData)); + + parcel->writeInt32(KEY_END_CHAR); + parcel->writeInt32(U16_AT(tmpData + 2)); + + parcel->writeInt32(KEY_FONT_ID); + parcel->writeInt32(U16_AT(tmpData + 4)); + + parcel->writeInt32(KEY_STYLE_FLAGS); + parcel->writeInt32(*(tmpData + 6)); + + parcel->writeInt32(KEY_FONT_SIZE); + parcel->writeInt32(*(tmpData + 7)); + + parcel->writeInt32(KEY_TEXT_COLOR_RGBA); + rgba = *(tmpData + 8) << 24 | *(tmpData + 9) << 16 + | *(tmpData + 10) << 8 | *(tmpData + 11); + parcel->writeInt32(rgba); + + tmpData += 12; + parcel->writeInt32(KEY_STRUCT_FONT_LIST); + uint16_t count = U16_AT(tmpData); + parcel->writeInt32(count); + + tmpData += 2; + for (int i = 0; i < count; i++) { + // font ID + parcel->writeInt32(U16_AT(tmpData)); + + // font name length + parcel->writeInt32(*(tmpData + 2)); + + int len = *(tmpData + 2); + + parcel->write(tmpData + 3, len); + tmpData += 3 + len; + } + + break; + } + default: + { + break; + } + } + + data += chunkSize; + size -= chunkSize; + + if (size > 0) { + // continue to extract next 'tx3g' + return extract3GPPGlobalDescriptions(data, size, parcel, 1); + } + + return OK; +} + +} // namespace android |