making act segmenter

1 files changed, 417 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/nellymoserenc.c b/ffmpeg/libavcodec/nellymoserenc.c
new file mode 100644
index 0000000..b35820a
--- /dev/null
+++ b/ffmpeg/libavcodec/nellymoserenc.c
@@ -0,0 +1,417 @@
+/*
+ * Nellymoser encoder
+ * This code is developed as part of Google Summer of Code 2008 Program.
+ *
+ * Copyright (c) 2008 Bartlomiej Wolowiec
+ *
+ * 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
+ * Nellymoser encoder
+ * by Bartlomiej Wolowiec
+ *
+ * Generic codec information: libavcodec/nellymoserdec.c
+ *
+ * Some information also from: http://samples.mplayerhq.hu/A-codecs/Nelly_Moser/ASAO/ASAO.zip
+ *                             (Copyright Joseph Artsimovich and UAB "DKD")
+ *
+ * for more information about nellymoser format, visit:
+ * http://wiki.multimedia.cx/index.php?title=Nellymoser
+ */
+
+#include "libavutil/float_dsp.h"
+#include "libavutil/mathematics.h"
+#include "nellymoser.h"
+#include "avcodec.h"
+#include "audio_frame_queue.h"
+#include "fft.h"
+#include "internal.h"
+#include "sinewin.h"
+
+#define BITSTREAM_WRITER_LE
+#include "put_bits.h"
+
+#define POW_TABLE_SIZE (1<<11)
+#define POW_TABLE_OFFSET 3
+#define OPT_SIZE ((1<<15) + 3000)
+
+typedef struct NellyMoserEncodeContext {
+    AVCodecContext  *avctx;
+    int             last_frame;
+    AVFloatDSPContext fdsp;
+    FFTContext      mdct_ctx;
+    AudioFrameQueue afq;
+    DECLARE_ALIGNED(32, float, mdct_out)[NELLY_SAMPLES];
+    DECLARE_ALIGNED(32, float, in_buff)[NELLY_SAMPLES];
+    DECLARE_ALIGNED(32, float, buf)[3 * NELLY_BUF_LEN];     ///< sample buffer
+    float           (*opt )[OPT_SIZE];
+    uint8_t         (*path)[OPT_SIZE];
+} NellyMoserEncodeContext;
+
+static float pow_table[POW_TABLE_SIZE];     ///< -pow(2, -i / 2048.0 - 3.0);
+
+static const uint8_t sf_lut[96] = {
+     0,  1,  1,  1,  1,  1,  1,  2,  2,  2,  2,  3,  3,  3,  4,  4,
+     5,  5,  5,  6,  7,  7,  8,  8,  9, 10, 11, 11, 12, 13, 13, 14,
+    15, 15, 16, 17, 17, 18, 19, 19, 20, 21, 22, 22, 23, 24, 25, 26,
+    27, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40,
+    41, 41, 42, 43, 44, 45, 45, 46, 47, 48, 49, 50, 51, 52, 52, 53,
+    54, 55, 55, 56, 57, 57, 58, 59, 59, 60, 60, 60, 61, 61, 61, 62,
+};
+
+static const uint8_t sf_delta_lut[78] = {
+     0,  1,  1,  1,  1,  1,  1,  2,  2,  2,  2,  3,  3,  3,  4,  4,
+     4,  5,  5,  5,  6,  6,  7,  7,  8,  8,  9, 10, 10, 11, 11, 12,
+    13, 13, 14, 15, 16, 17, 17, 18, 19, 19, 20, 21, 21, 22, 22, 23,
+    23, 24, 24, 25, 25, 25, 26, 26, 26, 26, 27, 27, 27, 27, 27, 28,
+    28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29, 29, 29, 30,
+};
+
+static const uint8_t quant_lut[230] = {
+     0,
+
+     0,  1,  2,
+
+     0,  1,  2,  3,  4,  5,  6,
+
+     0,  1,  1,  2,  2,  3,  3,  4,  5,  6,  7,  8,  9, 10, 11, 11,
+    12, 13, 13, 13, 14,
+
+     0,  1,  1,  2,  2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  8,
+     8,  9, 10, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
+    22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 29,
+    30,
+
+     0,  1,  1,  1,  1,  1,  1,  2,  2,  2,  2,  2,  3,  3,  3,  3,
+     4,  4,  4,  5,  5,  5,  6,  6,  7,  7,  7,  8,  8,  9,  9,  9,
+    10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 13, 14, 14, 14, 15, 15,
+    15, 15, 16, 16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 20, 20, 20,
+    21, 21, 22, 22, 23, 23, 24, 25, 26, 26, 27, 28, 29, 30, 31, 32,
+    33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 42, 43, 44, 44, 45, 45,
+    46, 47, 47, 48, 48, 49, 49, 50, 50, 50, 51, 51, 51, 52, 52, 52,
+    53, 53, 53, 54, 54, 54, 55, 55, 55, 56, 56, 56, 57, 57, 57, 57,
+    58, 58, 58, 58, 59, 59, 59, 59, 60, 60, 60, 60, 60, 61, 61, 61,
+    61, 61, 61, 61, 62,
+};
+
+static const float quant_lut_mul[7] = { 0.0,  0.0,  2.0,  2.0,  5.0, 12.0,  36.6 };
+static const float quant_lut_add[7] = { 0.0,  0.0,  2.0,  7.0, 21.0, 56.0, 157.0 };
+static const uint8_t quant_lut_offset[8] = { 0, 0, 1, 4, 11, 32, 81, 230 };
+
+static void apply_mdct(NellyMoserEncodeContext *s)
+{
+    float *in0 = s->buf;
+    float *in1 = s->buf + NELLY_BUF_LEN;
+    float *in2 = s->buf + 2 * NELLY_BUF_LEN;
+
+    s->fdsp.vector_fmul        (s->in_buff,                 in0, ff_sine_128, NELLY_BUF_LEN);
+    s->fdsp.vector_fmul_reverse(s->in_buff + NELLY_BUF_LEN, in1, ff_sine_128, NELLY_BUF_LEN);
+    s->mdct_ctx.mdct_calc(&s->mdct_ctx, s->mdct_out, s->in_buff);
+
+    s->fdsp.vector_fmul        (s->in_buff,                 in1, ff_sine_128, NELLY_BUF_LEN);
+    s->fdsp.vector_fmul_reverse(s->in_buff + NELLY_BUF_LEN, in2, ff_sine_128, NELLY_BUF_LEN);
+    s->mdct_ctx.mdct_calc(&s->mdct_ctx, s->mdct_out + NELLY_BUF_LEN, s->in_buff);
+}
+
+static av_cold int encode_end(AVCodecContext *avctx)
+{
+    NellyMoserEncodeContext *s = avctx->priv_data;
+
+    ff_mdct_end(&s->mdct_ctx);
+
+    if (s->avctx->trellis) {
+        av_free(s->opt);
+        av_free(s->path);
+    }
+    ff_af_queue_close(&s->afq);
+
+    return 0;
+}
+
+static av_cold int encode_init(AVCodecContext *avctx)
+{
+    NellyMoserEncodeContext *s = avctx->priv_data;
+    int i, ret;
+
+    if (avctx->channels != 1) {
+        av_log(avctx, AV_LOG_ERROR, "Nellymoser supports only 1 channel\n");
+        return AVERROR(EINVAL);
+    }
+
+    if (avctx->sample_rate != 8000 && avctx->sample_rate != 16000 &&
+        avctx->sample_rate != 11025 &&
+        avctx->sample_rate != 22050 && avctx->sample_rate != 44100 &&
+        avctx->strict_std_compliance >= FF_COMPLIANCE_NORMAL) {
+        av_log(avctx, AV_LOG_ERROR, "Nellymoser works only with 8000, 16000, 11025, 22050 and 44100 sample rate\n");
+        return AVERROR(EINVAL);
+    }
+
+    avctx->frame_size = NELLY_SAMPLES;
+    avctx->delay      = NELLY_BUF_LEN;
+    ff_af_queue_init(avctx, &s->afq);
+    s->avctx = avctx;
+    if ((ret = ff_mdct_init(&s->mdct_ctx, 8, 0, 32768.0)) < 0)
+        goto error;
+    avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
+
+    /* Generate overlap window */
+    ff_init_ff_sine_windows(7);
+    for (i = 0; i < POW_TABLE_SIZE; i++)
+        pow_table[i] = -pow(2, -i / 2048.0 - 3.0 + POW_TABLE_OFFSET);
+
+    if (s->avctx->trellis) {
+        s->opt  = av_malloc(NELLY_BANDS * OPT_SIZE * sizeof(float  ));
+        s->path = av_malloc(NELLY_BANDS * OPT_SIZE * sizeof(uint8_t));
+        if (!s->opt || !s->path) {
+            ret = AVERROR(ENOMEM);
+            goto error;
+        }
+    }
+
+    return 0;
+error:
+    encode_end(avctx);
+    return ret;
+}
+
+#define find_best(val, table, LUT, LUT_add, LUT_size) \
+    best_idx = \
+        LUT[av_clip ((lrintf(val) >> 8) + LUT_add, 0, LUT_size - 1)]; \
+    if (fabs(val - table[best_idx]) > fabs(val - table[best_idx + 1])) \
+        best_idx++;
+
+static void get_exponent_greedy(NellyMoserEncodeContext *s, float *cand, int *idx_table)
+{
+    int band, best_idx, power_idx = 0;
+    float power_candidate;
+
+    //base exponent
+    find_best(cand[0], ff_nelly_init_table, sf_lut, -20, 96);
+    idx_table[0] = best_idx;
+    power_idx = ff_nelly_init_table[best_idx];
+
+    for (band = 1; band < NELLY_BANDS; band++) {
+        power_candidate = cand[band] - power_idx;
+        find_best(power_candidate, ff_nelly_delta_table, sf_delta_lut, 37, 78);
+        idx_table[band] = best_idx;
+        power_idx += ff_nelly_delta_table[best_idx];
+    }
+}
+
+static inline float distance(float x, float y, int band)
+{
+    //return pow(fabs(x-y), 2.0);
+    float tmp = x - y;
+    return tmp * tmp;
+}
+
+static void get_exponent_dynamic(NellyMoserEncodeContext *s, float *cand, int *idx_table)
+{
+    int i, j, band, best_idx;
+    float power_candidate, best_val;
+
+    float  (*opt )[OPT_SIZE] = s->opt ;
+    uint8_t(*path)[OPT_SIZE] = s->path;
+
+    for (i = 0; i < NELLY_BANDS * OPT_SIZE; i++) {
+        opt[0][i] = INFINITY;
+    }
+
+    for (i = 0; i < 64; i++) {
+        opt[0][ff_nelly_init_table[i]] = distance(cand[0], ff_nelly_init_table[i], 0);
+        path[0][ff_nelly_init_table[i]] = i;
+    }
+
+    for (band = 1; band < NELLY_BANDS; band++) {
+        int q, c = 0;
+        float tmp;
+        int idx_min, idx_max, idx;
+        power_candidate = cand[band];
+        for (q = 1000; !c && q < OPT_SIZE; q <<= 2) {
+            idx_min = FFMAX(0, cand[band] - q);
+            idx_max = FFMIN(OPT_SIZE, cand[band - 1] + q);
+            for (i = FFMAX(0, cand[band - 1] - q); i < FFMIN(OPT_SIZE, cand[band - 1] + q); i++) {
+                if ( isinf(opt[band - 1][i]) )
+                    continue;
+                for (j = 0; j < 32; j++) {
+                    idx = i + ff_nelly_delta_table[j];
+                    if (idx > idx_max)
+                        break;
+                    if (idx >= idx_min) {
+                        tmp = opt[band - 1][i] + distance(idx, power_candidate, band);
+                        if (opt[band][idx] > tmp) {
+                            opt[band][idx] = tmp;
+                            path[band][idx] = j;
+                            c = 1;
+                        }
+                    }
+                }
+            }
+        }
+        assert(c); //FIXME
+    }
+
+    best_val = INFINITY;
+    best_idx = -1;
+    band = NELLY_BANDS - 1;
+    for (i = 0; i < OPT_SIZE; i++) {
+        if (best_val > opt[band][i]) {
+            best_val = opt[band][i];
+            best_idx = i;
+        }
+    }
+    for (band = NELLY_BANDS - 1; band >= 0; band--) {
+        idx_table[band] = path[band][best_idx];
+        if (band) {
+            best_idx -= ff_nelly_delta_table[path[band][best_idx]];
+        }
+    }
+}
+
+/**
+ * Encode NELLY_SAMPLES samples. It assumes, that samples contains 3 * NELLY_BUF_LEN values
+ *  @param s               encoder context
+ *  @param output          output buffer
+ *  @param output_size     size of output buffer
+ */
+static void encode_block(NellyMoserEncodeContext *s, unsigned char *output, int output_size)
+{
+    PutBitContext pb;
+    int i, j, band, block, best_idx, power_idx = 0;
+    float power_val, coeff, coeff_sum;
+    float pows[NELLY_FILL_LEN];
+    int bits[NELLY_BUF_LEN], idx_table[NELLY_BANDS];
+    float cand[NELLY_BANDS];
+
+    apply_mdct(s);
+
+    init_put_bits(&pb, output, output_size * 8);
+
+    i = 0;
+    for (band = 0; band < NELLY_BANDS; band++) {
+        coeff_sum = 0;
+        for (j = 0; j < ff_nelly_band_sizes_table[band]; i++, j++) {
+            coeff_sum += s->mdct_out[i                ] * s->mdct_out[i                ]
+                       + s->mdct_out[i + NELLY_BUF_LEN] * s->mdct_out[i + NELLY_BUF_LEN];
+        }
+        cand[band] =
+            log(FFMAX(1.0, coeff_sum / (ff_nelly_band_sizes_table[band] << 7))) * 1024.0 / M_LN2;
+    }
+
+    if (s->avctx->trellis) {
+        get_exponent_dynamic(s, cand, idx_table);
+    } else {
+        get_exponent_greedy(s, cand, idx_table);
+    }
+
+    i = 0;
+    for (band = 0; band < NELLY_BANDS; band++) {
+        if (band) {
+            power_idx += ff_nelly_delta_table[idx_table[band]];
+            put_bits(&pb, 5, idx_table[band]);
+        } else {
+            power_idx = ff_nelly_init_table[idx_table[0]];
+            put_bits(&pb, 6, idx_table[0]);
+        }
+        power_val = pow_table[power_idx & 0x7FF] / (1 << ((power_idx >> 11) + POW_TABLE_OFFSET));
+        for (j = 0; j < ff_nelly_band_sizes_table[band]; i++, j++) {
+            s->mdct_out[i] *= power_val;
+            s->mdct_out[i + NELLY_BUF_LEN] *= power_val;
+            pows[i] = power_idx;
+        }
+    }
+
+    ff_nelly_get_sample_bits(pows, bits);
+
+    for (block = 0; block < 2; block++) {
+        for (i = 0; i < NELLY_FILL_LEN; i++) {
+            if (bits[i] > 0) {
+                const float *table = ff_nelly_dequantization_table + (1 << bits[i]) - 1;
+                coeff = s->mdct_out[block * NELLY_BUF_LEN + i];
+                best_idx =
+                    quant_lut[av_clip (
+                            coeff * quant_lut_mul[bits[i]] + quant_lut_add[bits[i]],
+                            quant_lut_offset[bits[i]],
+                            quant_lut_offset[bits[i]+1] - 1
+                            )];
+                if (fabs(coeff - table[best_idx]) > fabs(coeff - table[best_idx + 1]))
+                    best_idx++;
+
+                put_bits(&pb, bits[i], best_idx);
+            }
+        }
+        if (!block)
+            put_bits(&pb, NELLY_HEADER_BITS + NELLY_DETAIL_BITS - put_bits_count(&pb), 0);
+    }
+
+    flush_put_bits(&pb);
+    memset(put_bits_ptr(&pb), 0, output + output_size - put_bits_ptr(&pb));
+}
+
+static int encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
+                        const AVFrame *frame, int *got_packet_ptr)
+{
+    NellyMoserEncodeContext *s = avctx->priv_data;
+    int ret;
+
+    if (s->last_frame)
+        return 0;
+
+    memcpy(s->buf, s->buf + NELLY_SAMPLES, NELLY_BUF_LEN * sizeof(*s->buf));
+    if (frame) {
+        memcpy(s->buf + NELLY_BUF_LEN, frame->data[0],
+               frame->nb_samples * sizeof(*s->buf));
+        if (frame->nb_samples < NELLY_SAMPLES) {
+            memset(s->buf + NELLY_BUF_LEN + frame->nb_samples, 0,
+                   (NELLY_SAMPLES - frame->nb_samples) * sizeof(*s->buf));
+            if (frame->nb_samples >= NELLY_BUF_LEN)
+                s->last_frame = 1;
+        }
+        if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
+            return ret;
+    } else {
+        memset(s->buf + NELLY_BUF_LEN, 0, NELLY_SAMPLES * sizeof(*s->buf));
+        s->last_frame = 1;
+    }
+
+    if ((ret = ff_alloc_packet2(avctx, avpkt, NELLY_BLOCK_LEN)) < 0)
+        return ret;
+    encode_block(s, avpkt->data, avpkt->size);
+
+    /* Get the next frame pts/duration */
+    ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
+                       &avpkt->duration);
+
+    *got_packet_ptr = 1;
+    return 0;
+}
+
+AVCodec ff_nellymoser_encoder = {
+    .name           = "nellymoser",
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_NELLYMOSER,
+    .priv_data_size = sizeof(NellyMoserEncodeContext),
+    .init           = encode_init,
+    .encode2        = encode_frame,
+    .close          = encode_end,
+    .capabilities   = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
+    .long_name      = NULL_IF_CONFIG_SMALL("Nellymoser Asao"),
+    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLT,
+                                                     AV_SAMPLE_FMT_NONE },
+};