TAK demuxer, decoder and parser

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 151 insertions, 0 deletions

diff --git a/libavcodec/tak.h b/libavcodec/tak.h
new file mode 100644
index 0000000000..cfa074defa
--- /dev/null
+++ b/libavcodec/tak.h
@@ -0,0 +1,151 @@
+/*
+ * TAK decoder/demuxer common code
+ * Copyright (c) 2012 Paul B Mahol
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; 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
+
+#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_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 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      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       where parsed information is stored
+ */
+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 */