tak: demuxer, parser, and decoder

Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>

1 files changed, 166 insertions, 0 deletions

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 <stdint.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_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 */