making act segmenter

1 files changed, 515 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/tta.c b/ffmpeg/libavcodec/tta.c
new file mode 100644
index 0000000..8b4ca5a
--- /dev/null
+++ b/ffmpeg/libavcodec/tta.c
@@ -0,0 +1,515 @@
+/*
+ * TTA (The Lossless True Audio) decoder
+ * Copyright (c) 2006 Alex Beregszaszi
+ *
+ * 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
+ * TTA (The Lossless True Audio) decoder
+ * @see http://www.true-audio.com/
+ * @see http://tta.corecodec.org/
+ * @author Alex Beregszaszi
+ */
+
+#define BITSTREAM_READER_LE
+//#define DEBUG
+#include <limits.h>
+#include "avcodec.h"
+#include "get_bits.h"
+#include "internal.h"
+#include "libavutil/crc.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/opt.h"
+
+#define FORMAT_SIMPLE    1
+#define FORMAT_ENCRYPTED 2
+
+#define MAX_ORDER 16
+typedef struct TTAFilter {
+    int32_t shift, round, error;
+    int32_t qm[MAX_ORDER];
+    int32_t dx[MAX_ORDER];
+    int32_t dl[MAX_ORDER];
+} TTAFilter;
+
+typedef struct TTARice {
+    uint32_t k0, k1, sum0, sum1;
+} TTARice;
+
+typedef struct TTAChannel {
+    int32_t predictor;
+    TTAFilter filter;
+    TTARice rice;
+} TTAChannel;
+
+typedef struct TTAContext {
+    AVClass *class;
+    AVCodecContext *avctx;
+    GetBitContext gb;
+    const AVCRC *crc_table;
+
+    int format, channels, bps;
+    unsigned data_length;
+    int frame_length, last_frame_length;
+
+    int32_t *decode_buffer;
+
+    uint8_t crc_pass[8];
+    uint8_t *pass;
+    TTAChannel *ch_ctx;
+} TTAContext;
+
+static const uint32_t 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 uint32_t * const shift_16 = shift_1 + 4;
+
+static const int32_t ttafilter_configs[4] = {
+    10,
+    9,
+    10,
+    12
+};
+
+static void ttafilter_init(TTAContext *s, TTAFilter *c, int32_t shift) {
+    memset(c, 0, sizeof(TTAFilter));
+    if (s->format == FORMAT_ENCRYPTED) {
+        int i;
+        for (i = 0; i < 8; i++)
+            c->qm[i] = sign_extend(s->crc_pass[i], 8);
+    }
+    c->shift = shift;
+   c->round = shift_1[shift-1];
+//    c->round = 1 << (shift - 1);
+}
+
+static inline void ttafilter_process(TTAFilter *c, int32_t *in)
+{
+    register int32_t *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round;
+
+    if (c->error < 0) {
+        qm[0] -= dx[0]; qm[1] -= dx[1]; qm[2] -= dx[2]; qm[3] -= dx[3];
+        qm[4] -= dx[4]; qm[5] -= dx[5]; qm[6] -= dx[6]; qm[7] -= dx[7];
+    } else if (c->error > 0) {
+        qm[0] += dx[0]; qm[1] += dx[1]; qm[2] += dx[2]; qm[3] += dx[3];
+        qm[4] += dx[4]; qm[5] += dx[5]; qm[6] += dx[6]; qm[7] += dx[7];
+    }
+
+    sum += dl[0] * qm[0] + dl[1] * qm[1] + dl[2] * qm[2] + dl[3] * qm[3] +
+           dl[4] * qm[4] + dl[5] * qm[5] + dl[6] * qm[6] + dl[7] * qm[7];
+
+    dx[0] = dx[1]; dx[1] = dx[2]; dx[2] = dx[3]; dx[3] = dx[4];
+    dl[0] = dl[1]; dl[1] = dl[2]; dl[2] = dl[3]; dl[3] = dl[4];
+
+    dx[4] = ((dl[4] >> 30) | 1);
+    dx[5] = ((dl[5] >> 30) | 2) & ~1;
+    dx[6] = ((dl[6] >> 30) | 2) & ~1;
+    dx[7] = ((dl[7] >> 30) | 4) & ~3;
+
+    c->error = *in;
+    *in += (sum >> c->shift);
+
+    dl[4] = -dl[5]; dl[5] = -dl[6];
+    dl[6] = *in - dl[7]; dl[7] = *in;
+    dl[5] += dl[6]; dl[4] += dl[5];
+}
+
+static void rice_init(TTARice *c, uint32_t k0, uint32_t 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_bits_left(gb) > 0 && get_bits1(gb))
+        ret++;
+    return ret;
+}
+
+static const int64_t tta_channel_layouts[7] = {
+    AV_CH_LAYOUT_STEREO,
+    AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,
+    AV_CH_LAYOUT_QUAD,
+    0,
+    AV_CH_LAYOUT_5POINT1_BACK,
+    AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER,
+    AV_CH_LAYOUT_7POINT1_WIDE
+};
+
+static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
+{
+    uint32_t crc, CRC;
+
+    CRC = AV_RL32(buf + buf_size);
+    crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size);
+    if (CRC != (crc ^ 0xFFFFFFFFU)) {
+        av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    return 0;
+}
+
+static uint64_t tta_check_crc64(uint8_t *pass)
+{
+    uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U;
+    uint8_t *end = pass + strlen(pass);
+    int i;
+
+    while (pass < end) {
+        crc ^= (uint64_t)*pass++ << 56;
+        for (i = 0; i < 8; i++)
+            crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63));
+    }
+
+    return crc ^ UINT64_MAX;
+}
+
+static av_cold int tta_decode_init(AVCodecContext * avctx)
+{
+    TTAContext *s = avctx->priv_data;
+    int total_frames;
+
+    s->avctx = avctx;
+
+    // 30bytes includes a seektable with one frame
+    if (avctx->extradata_size < 30)
+        return AVERROR_INVALIDDATA;
+
+    init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
+    if (show_bits_long(&s->gb, 32) == AV_RL32("TTA1"))
+    {
+        if (avctx->err_recognition & AV_EF_CRCCHECK) {
+            s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
+            tta_check_crc(s, avctx->extradata, 18);
+        }
+
+        /* signature */
+        skip_bits_long(&s->gb, 32);
+
+        s->format = get_bits(&s->gb, 16);
+        if (s->format > 2) {
+            av_log(avctx, AV_LOG_ERROR, "Invalid format\n");
+            return AVERROR_INVALIDDATA;
+        }
+        if (s->format == FORMAT_ENCRYPTED) {
+            if (!s->pass) {
+                av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n");
+                return AVERROR(EINVAL);
+            }
+            AV_WL64(s->crc_pass, tta_check_crc64(s->pass));
+        }
+        avctx->channels = s->channels = get_bits(&s->gb, 16);
+        if (s->channels > 1 && s->channels < 9)
+            avctx->channel_layout = tta_channel_layouts[s->channels-2];
+        avctx->bits_per_raw_sample = get_bits(&s->gb, 16);
+        s->bps = (avctx->bits_per_raw_sample + 7) / 8;
+        avctx->sample_rate = get_bits_long(&s->gb, 32);
+        s->data_length = get_bits_long(&s->gb, 32);
+        skip_bits_long(&s->gb, 32); // CRC32 of header
+
+        if (s->channels == 0) {
+            av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
+            return AVERROR_INVALIDDATA;
+        } else if (avctx->sample_rate == 0) {
+            av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        switch(s->bps) {
+        case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
+        case 2:
+            avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+            break;
+        case 3:
+            avctx->sample_fmt = AV_SAMPLE_FMT_S32;
+            break;
+        //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        // prevent overflow
+        if (avctx->sample_rate > 0x7FFFFFu) {
+            av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
+            return AVERROR(EINVAL);
+        }
+        s->frame_length = 256 * avctx->sample_rate / 245;
+
+        s->last_frame_length = s->data_length % s->frame_length;
+        total_frames = s->data_length / s->frame_length +
+                       (s->last_frame_length ? 1 : 0);
+
+        av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",
+            s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate,
+            avctx->block_align);
+        av_log(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, total_frames);
+
+        // FIXME: seek table
+        if (avctx->extradata_size <= 26 || total_frames > INT_MAX / 4 ||
+            avctx->extradata_size - 26 < total_frames * 4)
+            av_log(avctx, AV_LOG_WARNING, "Seek table missing or too small\n");
+        else if (avctx->err_recognition & AV_EF_CRCCHECK) {
+            if (tta_check_crc(s, avctx->extradata + 22, total_frames * 4))
+                return AVERROR_INVALIDDATA;
+        }
+        skip_bits_long(&s->gb, 32 * total_frames);
+        skip_bits_long(&s->gb, 32); // CRC32 of seektable
+
+        if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){
+            av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        if (s->bps < 3) {
+            s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
+            if (!s->decode_buffer)
+                return AVERROR(ENOMEM);
+        } else
+            s->decode_buffer = NULL;
+        s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
+        if (!s->ch_ctx) {
+            av_freep(&s->decode_buffer);
+            return AVERROR(ENOMEM);
+        }
+    } else {
+        av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    return 0;
+}
+
+static int tta_decode_frame(AVCodecContext *avctx, void *data,
+                            int *got_frame_ptr, AVPacket *avpkt)
+{
+    AVFrame *frame     = data;
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    TTAContext *s = avctx->priv_data;
+    int i, ret;
+    int cur_chan = 0, framelen = s->frame_length;
+    int32_t *p;
+
+    if (avctx->err_recognition & AV_EF_CRCCHECK) {
+        if (buf_size < 4 || tta_check_crc(s, buf, buf_size - 4))
+            return AVERROR_INVALIDDATA;
+    }
+
+    init_get_bits(&s->gb, buf, buf_size*8);
+
+    /* get output buffer */
+    frame->nb_samples = framelen;
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+        return ret;
+
+    // decode directly to output buffer for 24-bit sample format
+    if (s->bps == 3)
+        s->decode_buffer = (int32_t *)frame->data[0];
+
+    // init per channel states
+    for (i = 0; i < s->channels; i++) {
+        s->ch_ctx[i].predictor = 0;
+        ttafilter_init(s, &s->ch_ctx[i].filter, ttafilter_configs[s->bps-1]);
+        rice_init(&s->ch_ctx[i].rice, 10, 10);
+    }
+
+    i = 0;
+    for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
+        int32_t *predictor = &s->ch_ctx[cur_chan].predictor;
+        TTAFilter *filter = &s->ch_ctx[cur_chan].filter;
+        TTARice *rice = &s->ch_ctx[cur_chan].rice;
+        uint32_t unary, depth, k;
+        int32_t value;
+
+        unary = tta_get_unary(&s->gb);
+
+        if (unary == 0) {
+            depth = 0;
+            k = rice->k0;
+        } else {
+            depth = 1;
+            k = rice->k1;
+            unary--;
+        }
+
+        if (get_bits_left(&s->gb) < k) {
+            ret = AVERROR_INVALIDDATA;
+            goto error;
+        }
+
+        if (k) {
+            if (k > MIN_CACHE_BITS) {
+                ret = AVERROR_INVALIDDATA;
+                goto error;
+            }
+            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 coded value
+        *p = 1 + ((value >> 1) ^ ((value & 1) - 1));
+
+        // run hybrid filter
+        ttafilter_process(filter, p);
+
+        // fixed order prediction
+#define PRED(x, k) (int32_t)((((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;
+
+        // flip channels
+        if (cur_chan < (s->channels-1))
+            cur_chan++;
+        else {
+            // decorrelate in case of multiple channels
+            if (s->channels > 1) {
+                int32_t *r = p - 1;
+                for (*p += *r / 2; r > p - s->channels; r--)
+                    *r = *(r + 1) - *r;
+            }
+            cur_chan = 0;
+            i++;
+            // check for last frame
+            if (i == s->last_frame_length && get_bits_left(&s->gb) / 8 == 4) {
+                frame->nb_samples = framelen = s->last_frame_length;
+                break;
+            }
+        }
+    }
+
+    align_get_bits(&s->gb);
+    if (get_bits_left(&s->gb) < 32) {
+        ret = AVERROR_INVALIDDATA;
+        goto error;
+    }
+    skip_bits_long(&s->gb, 32); // frame crc
+
+    // convert to output buffer
+    switch (s->bps) {
+    case 1: {
+        uint8_t *samples = (uint8_t *)frame->data[0];
+        for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
+            *samples++ = *p + 0x80;
+        break;
+        }
+    case 2: {
+        int16_t *samples = (int16_t *)frame->data[0];
+        for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
+            *samples++ = *p;
+        break;
+        }
+    case 3: {
+        // shift samples for 24-bit sample format
+        int32_t *samples = (int32_t *)frame->data[0];
+        for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
+            *samples++ <<= 8;
+        // reset decode buffer
+        s->decode_buffer = NULL;
+        break;
+        }
+    }
+
+    *got_frame_ptr = 1;
+
+    return buf_size;
+error:
+    // reset decode buffer
+    if (s->bps == 3)
+        s->decode_buffer = NULL;
+    return ret;
+}
+
+static av_cold int tta_decode_close(AVCodecContext *avctx) {
+    TTAContext *s = avctx->priv_data;
+
+    if (s->bps < 3)
+        av_free(s->decode_buffer);
+    s->decode_buffer = NULL;
+    av_freep(&s->ch_ctx);
+
+    return 0;
+}
+
+#define OFFSET(x) offsetof(TTAContext, x)
+#define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
+static const AVOption options[] = {
+    { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
+    { NULL },
+};
+
+static const AVClass tta_decoder_class = {
+    .class_name = "TTA Decoder",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVCodec ff_tta_decoder = {
+    .name           = "tta",
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_TTA,
+    .priv_data_size = sizeof(TTAContext),
+    .init           = tta_decode_init,
+    .close          = tta_decode_close,
+    .decode         = tta_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
+    .priv_class     = &tta_decoder_class,
+};