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, 150 insertions, 0 deletions

diff --git a/libavcodec/tak.c b/libavcodec/tak.c
new file mode 100644
index 0000000000..867a84bc71
--- /dev/null
+++ b/libavcodec/tak.c
@@ -0,0 +1,150 @@
+/*
+ * TAK 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
+ */
+
+#include "libavutil/bswap.h"
+#include "libavutil/crc.h"
+#include "libavutil/intreadwrite.h"
+#include "tak.h"
+
+static const uint16_t frame_duration_type_quants[] = {
+    3, 4, 6, 8, 4096, 8192, 16384, 512, 1024, 2048,
+};
+
+static int tak_get_nb_samples(int sample_rate, enum TAKFrameSizeType type)
+{
+    int nb_samples, max_nb_samples;
+
+    if (type <= TAK_FST_250ms) {
+        nb_samples     = sample_rate * frame_duration_type_quants[type] >>
+                         TAK_FRAME_DURATION_QUANT_SHIFT;
+        max_nb_samples = 16384;
+    } else if (type < FF_ARRAY_ELEMS(frame_duration_type_quants)) {
+        nb_samples     = frame_duration_type_quants[type];
+        max_nb_samples = sample_rate *
+                         frame_duration_type_quants[TAK_FST_250ms] >>
+                         TAK_FRAME_DURATION_QUANT_SHIFT;
+    } else {
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (nb_samples <= 0 || nb_samples > max_nb_samples)
+        return AVERROR_INVALIDDATA;
+
+    return nb_samples;
+}
+
+static int crc_init = 0;
+#if CONFIG_SMALL
+#define CRC_TABLE_SIZE 257
+#else
+#define CRC_TABLE_SIZE 1024
+#endif
+static AVCRC crc_24[CRC_TABLE_SIZE];
+
+av_cold void ff_tak_init_crc(void)
+{
+    if (!crc_init) {
+        av_crc_init(crc_24, 0, 24, 0x864CFBU, sizeof(crc_24));
+        crc_init = 1;
+    }
+}
+
+int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size)
+{
+    uint32_t crc, CRC;
+
+    if (buf_size < 4)
+        return AVERROR_INVALIDDATA;
+    buf_size -= 3;
+
+    CRC = av_bswap32(AV_RL24(buf + buf_size)) >> 8;
+    crc = av_crc(crc_24, 0xCE04B7U, buf, buf_size);
+    if (CRC != crc)
+        return AVERROR_INVALIDDATA;
+
+    return 0;
+}
+
+void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s)
+{
+    uint64_t channel_mask = 0;
+    int frame_type, i;
+
+    s->codec = get_bits(gb, TAK_ENCODER_CODEC_BITS);
+    skip_bits(gb, TAK_ENCODER_PROFILE_BITS);
+
+    frame_type = get_bits(gb, TAK_SIZE_FRAME_DURATION_BITS);
+    s->samples = get_bits64(gb, TAK_SIZE_SAMPLES_NUM_BITS);
+
+    s->data_type   = get_bits(gb, TAK_FORMAT_DATA_TYPE_BITS);
+    s->sample_rate = get_bits(gb, TAK_FORMAT_SAMPLE_RATE_BITS) +
+                     TAK_SAMPLE_RATE_MIN;
+    s->bps         = get_bits(gb, TAK_FORMAT_BPS_BITS) +
+                     TAK_BPS_MIN;
+    s->channels    = get_bits(gb, TAK_FORMAT_CHANNEL_BITS) +
+                     TAK_CHANNELS_MIN;
+
+    if (get_bits1(gb)) {
+        skip_bits(gb, TAK_FORMAT_VALID_BITS);
+        if (get_bits1(gb)) {
+            for (i = 0; i < s->channels; i++) {
+                int value = get_bits(gb, TAK_FORMAT_CH_LAYOUT_BITS);
+
+                if (value > 0 && value <= 18)
+                    channel_mask |= 1 << (value - 1);
+            }
+        }
+    }
+
+    s->ch_layout     = channel_mask;
+    s->frame_samples = tak_get_nb_samples(s->sample_rate, frame_type);
+}
+
+int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
+                               TAKStreamInfo *ti, int log_level_offset)
+{
+    if (get_bits(gb, TAK_FRAME_HEADER_SYNC_ID_BITS) != TAK_FRAME_HEADER_SYNC_ID) {
+        av_log(avctx, AV_LOG_ERROR + log_level_offset, "missing sync id\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    ti->flags     = get_bits(gb, TAK_FRAME_HEADER_FLAGS_BITS);
+    ti->frame_num = get_bits(gb, TAK_FRAME_HEADER_NO_BITS);
+
+    if (ti->flags & TAK_FRAME_FLAG_IS_LAST) {
+        ti->last_frame_samples = get_bits(gb, TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) + 1;
+        skip_bits(gb, 2);
+    } else {
+        ti->last_frame_samples = 0;
+    }
+
+    if (ti->flags & TAK_FRAME_FLAG_HAS_INFO) {
+        avpriv_tak_parse_streaminfo(gb, ti);
+
+        if (get_bits(gb, 6))
+            skip_bits(gb, 25);
+        align_get_bits(gb);
+    }
+
+    skip_bits(gb, 24);
+
+    return 0;
+}