From 57231e4d5b467833fb289439cd35a92513bb55c1 Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Tue, 2 Oct 2012 13:43:19 +0000 Subject: tak: demuxer, parser, and decoder Signed-off-by: Paul B Mahol Signed-off-by: Justin Ruggles --- libavcodec/tak.h | 166 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 166 insertions(+) create mode 100644 libavcodec/tak.h (limited to 'libavcodec/tak.h') diff --git a/libavcodec/tak.h b/libavcodec/tak.h new file mode 100644 index 0000000000..fa91149793 --- /dev/null +++ b/libavcodec/tak.h @@ -0,0 +1,166 @@ +/* + * TAK decoder/demuxer common code + * Copyright (c) 2012 Paul B Mahol + * + * This file is part of Libav. + * + * Libav 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 of the License, or (at your option) any later version. + * + * Libav 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * TAK (Tom's lossless Audio Kompressor) decoder/demuxer common functions + */ + +#ifndef AVCODEC_TAK_H +#define AVCODEC_TAK_H + +#include + +#define BITSTREAM_READER_LE +#include "get_bits.h" +#include "avcodec.h" + +#define TAK_FORMAT_DATA_TYPE_BITS 3 +#define TAK_FORMAT_SAMPLE_RATE_BITS 18 +#define TAK_FORMAT_BPS_BITS 5 +#define TAK_FORMAT_CHANNEL_BITS 4 +#define TAK_FORMAT_VALID_BITS 5 +#define TAK_FORMAT_CH_LAYOUT_BITS 6 +#define TAK_SIZE_FRAME_DURATION_BITS 4 +#define TAK_SIZE_SAMPLES_NUM_BITS 35 +#define TAK_LAST_FRAME_POS_BITS 40 +#define TAK_LAST_FRAME_SIZE_BITS 24 +#define TAK_ENCODER_CODEC_BITS 6 +#define TAK_ENCODER_PROFILE_BITS 4 +#define TAK_ENCODER_VERSION_BITS 24 +#define TAK_SAMPLE_RATE_MIN 6000 +#define TAK_CHANNELS_MIN 1 +#define TAK_BPS_MIN 8 +#define TAK_FRAME_HEADER_FLAGS_BITS 3 +#define TAK_FRAME_HEADER_SYNC_ID 0xA0FF +#define TAK_FRAME_HEADER_SYNC_ID_BITS 16 +#define TAK_FRAME_HEADER_SAMPLE_COUNT_BITS 14 +#define TAK_FRAME_HEADER_NO_BITS 21 +#define TAK_FRAME_DURATION_QUANT_SHIFT 5 +#define TAK_CRC24_BITS 24 + + +#define TAK_FRAME_FLAG_IS_LAST 0x1 +#define TAK_FRAME_FLAG_HAS_INFO 0x2 +#define TAK_FRAME_FLAG_HAS_METADATA 0x4 + +#define TAK_MAX_CHANNELS (1 << TAK_FORMAT_CHANNEL_BITS) + +#define TAK_MIN_FRAME_HEADER_BITS (TAK_FRAME_HEADER_SYNC_ID_BITS + \ + TAK_FRAME_HEADER_FLAGS_BITS + \ + TAK_FRAME_HEADER_NO_BITS + \ + TAK_CRC24_BITS) + +#define TAK_MIN_FRAME_HEADER_LAST_BITS (TAK_MIN_FRAME_HEADER_BITS + 2 + \ + TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) + +#define TAK_ENCODER_BITS (TAK_ENCODER_CODEC_BITS + \ + TAK_ENCODER_PROFILE_BITS) + +#define TAK_SIZE_BITS (TAK_SIZE_SAMPLES_NUM_BITS + \ + TAK_SIZE_FRAME_DURATION_BITS) + +#define TAK_FORMAT_BITS (TAK_FORMAT_DATA_TYPE_BITS + \ + TAK_FORMAT_SAMPLE_RATE_BITS + \ + TAK_FORMAT_BPS_BITS + \ + TAK_FORMAT_CHANNEL_BITS + 1 + \ + TAK_FORMAT_VALID_BITS + 1 + \ + TAK_FORMAT_CH_LAYOUT_BITS * \ + TAK_MAX_CHANNELS) + +#define TAK_STREAMINFO_BITS (TAK_ENCODER_BITS + \ + TAK_SIZE_BITS + \ + TAK_FORMAT_BITS) + +#define TAK_MAX_FRAME_HEADER_BITS (TAK_MIN_FRAME_HEADER_LAST_BITS + \ + TAK_STREAMINFO_BITS + 31) + +#define TAK_STREAMINFO_BYTES ((TAK_STREAMINFO_BITS + 7) / 8) +#define TAK_MAX_FRAME_HEADER_BYTES ((TAK_MAX_FRAME_HEADER_BITS + 7) / 8) +#define TAK_MIN_FRAME_HEADER_BYTES ((TAK_MIN_FRAME_HEADER_BITS + 7) / 8) + +enum TAKCodecType { + TAK_CODEC_MONO_STEREO = 2, + TAK_CODEC_MULTICHANNEL = 4 +}; + +enum TAKMetaDataType { + TAK_METADATA_END = 0, + TAK_METADATA_STREAMINFO, + TAK_METADATA_SEEKTABLE, + TAK_METADATA_SIMPLE_WAVE_DATA, + TAK_METADATA_ENCODER, + TAK_METADATA_PADDING, + TAK_METADATA_MD5, + TAK_METADATA_LAST_FRAME, +}; + +enum TAKFrameSizeType { + TAK_FST_94ms = 0, + TAK_FST_125ms, + TAK_FST_188ms, + TAK_FST_250ms, + TAK_FST_4096, + TAK_FST_8192, + TAK_FST_16384, + TAK_FST_512, + TAK_FST_1024, + TAK_FST_2048, +}; + +typedef struct TAKStreamInfo { + int flags; + enum TAKCodecType codec; + int data_type; + int sample_rate; + int channels; + int bps; + int frame_num; + int frame_samples; + int last_frame_samples; + uint64_t ch_layout; + int64_t samples; +} TAKStreamInfo; + +void ff_tak_init_crc(void); + +int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size); + +/** + * Parse the Streaminfo metadata block. + * @param[in] gb pointer to GetBitContext + * @param[out] s storage for parsed information + */ +void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s); + +/** + * Validate and decode a frame header. + * @param avctx AVCodecContext to use as av_log() context + * @param[in] gb GetBitContext from which to read frame header + * @param[out] s frame information + * @param log_level_offset log level offset, can be used to silence + * error messages. + * @return non-zero on error, 0 if OK + */ +int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb, + TAKStreamInfo *s, int log_level_offset); + +#endif /* AVCODEC_TAK_H */ -- cgit v1.2.1