tta decoder, tested with 44khz mono and stereo (for the latter use ffplay or change MAX_AUDIO_FRAME_SIZE)

Originally committed as revision 4996 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 446 insertions, 0 deletions

diff --git a/libavcodec/tta.c b/libavcodec/tta.c
new file mode 100644
index 0000000000..e35853aa6f
--- /dev/null
+++ b/libavcodec/tta.c
@@ -0,0 +1,446 @@
+/*
+ * TTA (The Lossless True Audio) decoder
+ * Copyright (c) 2006 Alex Beregszaszi
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/**
+ * @file tta.c
+ * TTA (The Lossless True Audio) decoder
+ * (www.true-audio.com or tta.corecodec.org)
+ * @author Alex Beregszaszi
+ *
+ */
+
+#define ALT_BITSTREAM_READER_LE
+//#define DEBUG
+#include <limits.h>
+#include "avcodec.h"
+#include "bitstream.h"
+
+#define FORMAT_INT 1
+#define FORMAT_FLOAT 3
+
+typedef struct TTAContext {
+    AVCodecContext *avctx;
+    GetBitContext gb;
+
+    int flags, channels, bps, is_float, data_length;
+    int frame_length, last_frame_length, total_frames;
+
+    long *decode_buffer;
+} TTAContext;
+
+#if 0
+static inline int shift_1(int i)
+{
+    if (i < 32)
+        return 1 << i;
+    else
+        return 0x80000000; // 16 << 31
+}
+
+static inline int shift_16(int i)
+{
+    if (i < 28)
+        return 16 << i;
+    else
+        return 0x80000000; // 16 << 27
+}
+#else
+static const unsigned long shift_1[] = {
+    0x00000001, 0x00000002, 0x00000004, 0x00000008,
+    0x00000010, 0x00000020, 0x00000040, 0x00000080,
+    0x00000100, 0x00000200, 0x00000400, 0x00000800,
+    0x00001000, 0x00002000, 0x00004000, 0x00008000,
+    0x00010000, 0x00020000, 0x00040000, 0x00080000,
+    0x00100000, 0x00200000, 0x00400000, 0x00800000,
+    0x01000000, 0x02000000, 0x04000000, 0x08000000,
+    0x10000000, 0x20000000, 0x40000000, 0x80000000,
+    0x80000000, 0x80000000, 0x80000000, 0x80000000,
+    0x80000000, 0x80000000, 0x80000000, 0x80000000
+};
+
+static const unsigned long *shift_16 = shift_1 + 4;
+#endif
+
+#define MAX_ORDER 16
+typedef struct TTAFilter {
+    long shift, round, error, mode;
+    long qm[MAX_ORDER];
+    long dx[MAX_ORDER];
+    long dl[MAX_ORDER];
+} TTAFilter;
+
+static long ttafilter_configs[4][2] = {
+    {10, 1},
+    {9, 1},
+    {10, 1},
+    {12, 0}
+};
+
+static void ttafilter_init(TTAFilter *c, long shift, long mode) {
+    memset(c, 0, sizeof(TTAFilter));
+    c->shift = shift;
+   c->round = shift_1[shift-1];
+//    c->round = 1 << (shift - 1);
+    c->mode = mode;
+}
+
+// FIXME: copy paste from original
+static inline void memshl(register long *a, register long *b) {
+    *a++ = *b++;
+    *a++ = *b++;
+    *a++ = *b++;
+    *a++ = *b++;
+    *a++ = *b++;
+    *a++ = *b++;
+    *a++ = *b++;
+    *a = *b;
+}
+
+// FIXME: copy paste from original
+// mode=1 encoder, mode=0 decoder
+static inline void ttafilter_process(TTAFilter *c, long *in, long mode) {
+    register long *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round;
+
+    if (!c->error) {
+        sum += *dl++ * *qm, qm++;
+        sum += *dl++ * *qm, qm++;
+        sum += *dl++ * *qm, qm++;
+        sum += *dl++ * *qm, qm++;
+        sum += *dl++ * *qm, qm++;
+        sum += *dl++ * *qm, qm++;
+        sum += *dl++ * *qm, qm++;
+        sum += *dl++ * *qm, qm++;
+        dx += 8;
+    } else if(c->error < 0) {
+        sum += *dl++ * (*qm -= *dx++), qm++;
+        sum += *dl++ * (*qm -= *dx++), qm++;
+        sum += *dl++ * (*qm -= *dx++), qm++;
+        sum += *dl++ * (*qm -= *dx++), qm++;
+        sum += *dl++ * (*qm -= *dx++), qm++;
+        sum += *dl++ * (*qm -= *dx++), qm++;
+        sum += *dl++ * (*qm -= *dx++), qm++;
+        sum += *dl++ * (*qm -= *dx++), qm++;
+    } else {
+        sum += *dl++ * (*qm += *dx++), qm++;
+        sum += *dl++ * (*qm += *dx++), qm++;
+        sum += *dl++ * (*qm += *dx++), qm++;
+        sum += *dl++ * (*qm += *dx++), qm++;
+        sum += *dl++ * (*qm += *dx++), qm++;
+        sum += *dl++ * (*qm += *dx++), qm++;
+        sum += *dl++ * (*qm += *dx++), qm++;
+        sum += *dl++ * (*qm += *dx++), qm++;
+    }
+
+    *(dx-0) = ((*(dl-1) >> 30) | 1) << 2;
+    *(dx-1) = ((*(dl-2) >> 30) | 1) << 1;
+    *(dx-2) = ((*(dl-3) >> 30) | 1) << 1;
+    *(dx-3) = ((*(dl-4) >> 30) | 1);
+
+    // compress
+    if (mode) {
+        *dl = *in;
+        *in -= (sum >> c->shift);
+        c->error = *in;
+    } else {
+        c->error = *in;
+        *in += (sum >> c->shift);
+        *dl = *in;
+    }
+
+    if (c->mode) {
+        *(dl-1) = *dl - *(dl-1);
+        *(dl-2) = *(dl-1) - *(dl-2);
+        *(dl-3) = *(dl-2) - *(dl-3);
+    }
+
+    memshl(c->dl, c->dl + 1);
+    memshl(c->dx, c->dx + 1);
+}
+
+typedef struct TTARice {
+    unsigned long k0, k1, sum0, sum1;
+} TTARice;
+
+static void rice_init(TTARice *c, unsigned long k0, unsigned long k1)
+{
+    c->k0 = k0;
+    c->k1 = k1;
+    c->sum0 = shift_16[k0];
+    c->sum1 = shift_16[k1];
+}
+
+static int tta_get_unary(GetBitContext *gb)
+{
+    int ret = 0;
+
+    // count ones
+    while(get_bits1(gb))
+        ret++;
+    return ret;
+}
+
+// shamelessly copied from shorten.c
+static int inline get_le16(GetBitContext *gb)
+{
+    return bswap_16(get_bits_long(gb, 16));
+}
+
+static int inline get_le32(GetBitContext *gb)
+{
+    return bswap_32(get_bits_long(gb, 32));
+}
+
+static int tta_decode_init(AVCodecContext * avctx)
+{
+    TTAContext *s = avctx->priv_data;
+    int i;
+
+    s->avctx = avctx;
+
+    // 30bytes includes a seektable with one frame
+    if (avctx->extradata_size < 30)
+        return -1;
+
+    init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size);
+    if (show_bits_long(&s->gb, 32) == bswap_32(ff_get_fourcc("TTA1")))
+    {
+        /* signature */
+        skip_bits(&s->gb, 32);
+//        if (get_bits_long(&s->gb, 32) != bswap_32(ff_get_fourcc("TTA1"))) {
+//            av_log(s->avctx, AV_LOG_ERROR, "Missing magic\n");
+//            return -1;
+//        }
+
+        s->flags = get_le16(&s->gb);
+        if (s->flags != 1 && s->flags != 3)
+        {
+            av_log(s->avctx, AV_LOG_ERROR, "Invalid flags\n");
+            return -1;
+        }
+        s->is_float = (s->flags == FORMAT_FLOAT);
+        avctx->channels = s->channels = get_le16(&s->gb);
+        avctx->bits_per_sample = get_le16(&s->gb);
+        s->bps = (avctx->bits_per_sample + 7) / 8;
+        avctx->sample_rate = get_le32(&s->gb);
+        s->data_length = get_le32(&s->gb);
+        skip_bits(&s->gb, 32); // CRC32 of header
+
+        if (s->is_float)
+        {
+            avctx->sample_fmt = SAMPLE_FMT_FLT;
+            av_log(s->avctx, AV_LOG_ERROR, "Unsupported sample format. Please contact the developers.\n");
+            return -1;
+        }
+        else switch(s->bps) {
+//            case 1: avctx->sample_fmt = SAMPLE_FMT_U8; break;
+            case 2: avctx->sample_fmt = SAMPLE_FMT_S16; break;
+//            case 3: avctx->sample_fmt = SAMPLE_FMT_S24; break;
+            case 4: avctx->sample_fmt = SAMPLE_FMT_S32; break;
+            default:
+                av_log(s->avctx, AV_LOG_ERROR, "Invalid/unsupported sample format. Please contact the developers.\n");
+                return -1;
+        }
+
+        // FIXME: horribly broken, but directly from reference source
+#define FRAME_TIME 1.04489795918367346939
+        s->frame_length = (int)(FRAME_TIME * avctx->sample_rate);
+
+        s->last_frame_length = s->data_length % s->frame_length;
+        s->total_frames = s->data_length / s->frame_length +
+                        (s->last_frame_length ? 1 : 0);
+
+        av_log(s->avctx, AV_LOG_DEBUG, "flags: %x chans: %d bps: %d rate: %d block: %d\n",
+            s->flags, avctx->channels, avctx->bits_per_sample, avctx->sample_rate,
+            avctx->block_align);
+        av_log(s->avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
+            s->data_length, s->frame_length, s->last_frame_length, s->total_frames);
+
+        // FIXME: seek table
+        for (i = 0; i < s->total_frames; i++)
+            skip_bits(&s->gb, 32);
+        skip_bits(&s->gb, 32); // CRC32 of seektable
+
+        s->decode_buffer = av_mallocz(sizeof(long)*s->frame_length*s->channels);
+    } else {
+        av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
+        return -1;
+    }
+
+    return 0;
+}
+
+static int tta_decode_frame(AVCodecContext *avctx,
+        void *data, int *data_size,
+        uint8_t *buf, int buf_size)
+{
+    TTAContext *s = avctx->priv_data;
+    int i;
+
+    init_get_bits(&s->gb, buf, buf_size*8);
+    {
+        long predictors[s->channels];
+        TTAFilter filters[s->channels];
+        TTARice rices[s->channels];
+        int cur_chan = 0, framelen = s->frame_length;
+        long *p;
+
+        // FIXME: seeking
+        s->total_frames--;
+        if (!s->total_frames && s->last_frame_length)
+            framelen = s->last_frame_length;
+
+        // init per channel states
+        for (i = 0; i < s->channels; i++) {
+            predictors[i] = 0;
+            ttafilter_init(&(filters[i]), ttafilter_configs[s->bps-1][0], ttafilter_configs[s->bps-1][1]);
+            rice_init(&(rices[i]), 10, 10);
+        }
+
+        for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
+            long *predictor = &(predictors[cur_chan]);
+            TTAFilter *filter = &(filters[cur_chan]);
+            TTARice *rice = &(rices[cur_chan]);
+            unsigned long unary, depth, k;
+            long value;
+
+            unary = tta_get_unary(&s->gb);
+
+            if (unary == 0) {
+                depth = 0;
+                k = rice->k0;
+            } else {
+                depth = 1;
+                k = rice->k1;
+                unary--;
+            }
+
+            if (k)
+                value = (unary << k) + get_bits(&s->gb, k);
+            else
+                value = unary;
+
+            // FIXME: copy paste from original
+            switch (depth) {
+            case 1:
+                rice->sum1 += value - (rice->sum1 >> 4);
+                if (rice->k1 > 0 && rice->sum1 < shift_16[rice->k1])
+                    rice->k1--;
+                else if(rice->sum1 > shift_16[rice->k1 + 1])
+                    rice->k1++;
+                value += shift_1[rice->k0];
+            default:
+                rice->sum0 += value - (rice->sum0 >> 4);
+                if (rice->k0 > 0 && rice->sum0 < shift_16[rice->k0])
+                    rice->k0--;
+                else if(rice->sum0 > shift_16[rice->k0 + 1])
+                    rice->k0++;
+            }
+
+            // extract sign
+#define SIGN(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1))
+            *p = SIGN(value);
+
+            // run hybrid filter
+            ttafilter_process(filter, p, 0);
+
+            // fixed order prediction
+#define PRED(x, k) (long)((((uint64_t)x << k) - x) >> k)
+            switch (s->bps) {
+                case 1: *p += PRED(*predictor, 4); break;
+                case 2:
+                case 3: *p += PRED(*predictor, 5); break;
+                case 4: *p += *predictor; break;
+            }
+            *predictor = *p;
+
+#if 0
+            // extract 32bit float from last two int samples
+            if (s->is_float && ((p - data) & 1)) {
+                unsigned long neg = *p & 0x80000000;
+                unsigned long hi = *(p - 1);
+                unsigned long lo = abs(*p) - 1;
+
+                hi += (hi || lo) ? 0x3f80 : 0;
+                // SWAP16: swap all the 16 bits
+                *(p - 1) = (hi << 16) | SWAP16(lo) | neg;
+            }
+#endif
+
+            /*if ((get_bits_count(&s->gb)+7)/8 > buf_size)
+            {
+                av_log(NULL, AV_LOG_INFO, "overread!!\n");
+                break;
+            }*/
+
+            // flip channels
+            if (cur_chan < (s->channels-1))
+                cur_chan++;
+            else {
+                // decorrelate in case of stereo integer
+                if (!s->is_float && (s->channels > 1)) {
+                    long *r = p - 1;
+                    for (*p += *r / 2; r > p - s->channels; r--)
+                        *r = *(r + 1) - *r;
+                }
+                cur_chan = 0;
+            }
+        }
+
+        skip_bits(&s->gb, 32); // frame crc
+
+        // convert to output buffer
+        switch(s->bps) {
+            case 2: {
+                uint16_t *samples = data;
+                for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
+//                    *samples++ = (unsigned char)*p;
+//                    *samples++ = (unsigned char)(*p >> 8);
+                    *samples++ = *p;
+                }
+                *data_size = (uint8_t *)samples - (uint8_t *)data;
+                break;
+            }
+            default:
+                av_log(s->avctx, AV_LOG_ERROR, "Error, only 16bit samples supported!\n");
+        }
+    }
+
+//    return get_bits_count(&s->gb)+7)/8;
+    return buf_size;
+}
+
+static int tta_decode_close(AVCodecContext *avctx) {
+    TTAContext *s = avctx->priv_data;
+
+    if (s->decode_buffer)
+        av_free(s->decode_buffer);
+
+    return 0;
+}
+
+AVCodec tta_decoder = {
+    "tta",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_TTA,
+    sizeof(TTAContext),
+    tta_decode_init,
+    NULL,
+    tta_decode_close,
+    tta_decode_frame,
+};