making act segmenter

1 files changed, 359 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/binkaudio.c b/ffmpeg/libavcodec/binkaudio.c
new file mode 100644
index 0000000..ef5569a
--- /dev/null
+++ b/ffmpeg/libavcodec/binkaudio.c
@@ -0,0 +1,359 @@
+/*
+ * Bink Audio decoder
+ * Copyright (c) 2007-2011 Peter Ross (pross@xvid.org)
+ * Copyright (c) 2009 Daniel Verkamp (daniel@drv.nu)
+ *
+ * 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
+ * Bink Audio decoder
+ *
+ * Technical details here:
+ *  http://wiki.multimedia.cx/index.php?title=Bink_Audio
+ */
+
+#include "libavutil/channel_layout.h"
+#include "avcodec.h"
+#define BITSTREAM_READER_LE
+#include "get_bits.h"
+#include "dct.h"
+#include "rdft.h"
+#include "fmtconvert.h"
+#include "internal.h"
+#include "libavutil/intfloat.h"
+
+extern const uint16_t ff_wma_critical_freqs[25];
+
+static float quant_table[96];
+
+#define MAX_CHANNELS 2
+#define BINK_BLOCK_MAX_SIZE (MAX_CHANNELS << 11)
+
+typedef struct {
+    GetBitContext gb;
+    int version_b;          ///< Bink version 'b'
+    int first;
+    int channels;
+    int frame_len;          ///< transform size (samples)
+    int overlap_len;        ///< overlap size (samples)
+    int block_size;
+    int num_bands;
+    unsigned int *bands;
+    float root;
+    DECLARE_ALIGNED(32, FFTSample, coeffs)[BINK_BLOCK_MAX_SIZE];
+    float previous[MAX_CHANNELS][BINK_BLOCK_MAX_SIZE / 16];  ///< coeffs from previous audio block
+    uint8_t *packet_buffer;
+    union {
+        RDFTContext rdft;
+        DCTContext dct;
+    } trans;
+} BinkAudioContext;
+
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    BinkAudioContext *s = avctx->priv_data;
+    int sample_rate = avctx->sample_rate;
+    int sample_rate_half;
+    int i;
+    int frame_len_bits;
+
+    /* determine frame length */
+    if (avctx->sample_rate < 22050) {
+        frame_len_bits = 9;
+    } else if (avctx->sample_rate < 44100) {
+        frame_len_bits = 10;
+    } else {
+        frame_len_bits = 11;
+    }
+
+    if (avctx->channels < 1 || avctx->channels > MAX_CHANNELS) {
+        av_log(avctx, AV_LOG_ERROR, "invalid number of channels: %d\n", avctx->channels);
+        return AVERROR_INVALIDDATA;
+    }
+    avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO :
+                                                   AV_CH_LAYOUT_STEREO;
+
+    s->version_b = avctx->extradata_size >= 4 && avctx->extradata[3] == 'b';
+
+    if (avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) {
+        // audio is already interleaved for the RDFT format variant
+        avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
+        sample_rate  *= avctx->channels;
+        s->channels = 1;
+        if (!s->version_b)
+            frame_len_bits += av_log2(avctx->channels);
+    } else {
+        s->channels = avctx->channels;
+        avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
+    }
+
+    s->frame_len     = 1 << frame_len_bits;
+    s->overlap_len   = s->frame_len / 16;
+    s->block_size    = (s->frame_len - s->overlap_len) * s->channels;
+    sample_rate_half = (sample_rate + 1) / 2;
+    if (avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT)
+        s->root = 2.0 / (sqrt(s->frame_len) * 32768.0);
+    else
+        s->root = s->frame_len / (sqrt(s->frame_len) * 32768.0);
+    for (i = 0; i < 96; i++) {
+        /* constant is result of 0.066399999/log10(M_E) */
+        quant_table[i] = expf(i * 0.15289164787221953823f) * s->root;
+    }
+
+    /* calculate number of bands */
+    for (s->num_bands = 1; s->num_bands < 25; s->num_bands++)
+        if (sample_rate_half <= ff_wma_critical_freqs[s->num_bands - 1])
+            break;
+
+    s->bands = av_malloc((s->num_bands + 1) * sizeof(*s->bands));
+    if (!s->bands)
+        return AVERROR(ENOMEM);
+
+    /* populate bands data */
+    s->bands[0] = 2;
+    for (i = 1; i < s->num_bands; i++)
+        s->bands[i] = (ff_wma_critical_freqs[i - 1] * s->frame_len / sample_rate_half) & ~1;
+    s->bands[s->num_bands] = s->frame_len;
+
+    s->first = 1;
+
+    if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT)
+        ff_rdft_init(&s->trans.rdft, frame_len_bits, DFT_C2R);
+    else if (CONFIG_BINKAUDIO_DCT_DECODER)
+        ff_dct_init(&s->trans.dct, frame_len_bits, DCT_III);
+    else
+        return -1;
+
+    return 0;
+}
+
+static float get_float(GetBitContext *gb)
+{
+    int power = get_bits(gb, 5);
+    float f = ldexpf(get_bits_long(gb, 23), power - 23);
+    if (get_bits1(gb))
+        f = -f;
+    return f;
+}
+
+static const uint8_t rle_length_tab[16] = {
+    2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 64
+};
+
+/**
+ * Decode Bink Audio block
+ * @param[out] out Output buffer (must contain s->block_size elements)
+ * @return 0 on success, negative error code on failure
+ */
+static int decode_block(BinkAudioContext *s, float **out, int use_dct)
+{
+    int ch, i, j, k;
+    float q, quant[25];
+    int width, coeff;
+    GetBitContext *gb = &s->gb;
+
+    if (use_dct)
+        skip_bits(gb, 2);
+
+    for (ch = 0; ch < s->channels; ch++) {
+        FFTSample *coeffs = out[ch];
+
+        if (s->version_b) {
+            if (get_bits_left(gb) < 64)
+                return AVERROR_INVALIDDATA;
+            coeffs[0] = av_int2float(get_bits_long(gb, 32)) * s->root;
+            coeffs[1] = av_int2float(get_bits_long(gb, 32)) * s->root;
+        } else {
+            if (get_bits_left(gb) < 58)
+                return AVERROR_INVALIDDATA;
+            coeffs[0] = get_float(gb) * s->root;
+            coeffs[1] = get_float(gb) * s->root;
+        }
+
+        if (get_bits_left(gb) < s->num_bands * 8)
+            return AVERROR_INVALIDDATA;
+        for (i = 0; i < s->num_bands; i++) {
+            int value = get_bits(gb, 8);
+            quant[i]  = quant_table[FFMIN(value, 95)];
+        }
+
+        k = 0;
+        q = quant[0];
+
+        // parse coefficients
+        i = 2;
+        while (i < s->frame_len) {
+            if (s->version_b) {
+                j = i + 16;
+            } else {
+                int v = get_bits1(gb);
+                if (v) {
+                    v = get_bits(gb, 4);
+                    j = i + rle_length_tab[v] * 8;
+                } else {
+                    j = i + 8;
+                }
+            }
+
+            j = FFMIN(j, s->frame_len);
+
+            width = get_bits(gb, 4);
+            if (width == 0) {
+                memset(coeffs + i, 0, (j - i) * sizeof(*coeffs));
+                i = j;
+                while (s->bands[k] < i)
+                    q = quant[k++];
+            } else {
+                while (i < j) {
+                    if (s->bands[k] == i)
+                        q = quant[k++];
+                    coeff = get_bits(gb, width);
+                    if (coeff) {
+                        int v;
+                        v = get_bits1(gb);
+                        if (v)
+                            coeffs[i] = -q * coeff;
+                        else
+                            coeffs[i] =  q * coeff;
+                    } else {
+                        coeffs[i] = 0.0f;
+                    }
+                    i++;
+                }
+            }
+        }
+
+        if (CONFIG_BINKAUDIO_DCT_DECODER && use_dct) {
+            coeffs[0] /= 0.5;
+            s->trans.dct.dct_calc(&s->trans.dct,  coeffs);
+        }
+        else if (CONFIG_BINKAUDIO_RDFT_DECODER)
+            s->trans.rdft.rdft_calc(&s->trans.rdft, coeffs);
+    }
+
+    for (ch = 0; ch < s->channels; ch++) {
+        int j;
+        int count = s->overlap_len * s->channels;
+        if (!s->first) {
+            j = ch;
+            for (i = 0; i < s->overlap_len; i++, j += s->channels)
+                out[ch][i] = (s->previous[ch][i] * (count - j) +
+                                      out[ch][i] *          j) / count;
+        }
+        memcpy(s->previous[ch], &out[ch][s->frame_len - s->overlap_len],
+               s->overlap_len * sizeof(*s->previous[ch]));
+    }
+
+    s->first = 0;
+
+    return 0;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx)
+{
+    BinkAudioContext * s = avctx->priv_data;
+    av_freep(&s->bands);
+    av_freep(&s->packet_buffer);
+    if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT)
+        ff_rdft_end(&s->trans.rdft);
+    else if (CONFIG_BINKAUDIO_DCT_DECODER)
+        ff_dct_end(&s->trans.dct);
+
+    return 0;
+}
+
+static void get_bits_align32(GetBitContext *s)
+{
+    int n = (-get_bits_count(s)) & 31;
+    if (n) skip_bits(s, n);
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data,
+                        int *got_frame_ptr, AVPacket *avpkt)
+{
+    BinkAudioContext *s = avctx->priv_data;
+    AVFrame *frame      = data;
+    GetBitContext *gb = &s->gb;
+    int ret, consumed = 0;
+
+    if (!get_bits_left(gb)) {
+        uint8_t *buf;
+        /* handle end-of-stream */
+        if (!avpkt->size) {
+            *got_frame_ptr = 0;
+            return 0;
+        }
+        if (avpkt->size < 4) {
+            av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
+            return AVERROR_INVALIDDATA;
+        }
+        buf = av_realloc(s->packet_buffer, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
+        if (!buf)
+            return AVERROR(ENOMEM);
+        s->packet_buffer = buf;
+        memcpy(s->packet_buffer, avpkt->data, avpkt->size);
+        init_get_bits(gb, s->packet_buffer, avpkt->size * 8);
+        consumed = avpkt->size;
+
+        /* skip reported size */
+        skip_bits_long(gb, 32);
+    }
+
+    /* get output buffer */
+    frame->nb_samples = s->frame_len;
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+        return ret;
+
+    if (decode_block(s, (float **)frame->extended_data,
+                     avctx->codec->id == AV_CODEC_ID_BINKAUDIO_DCT)) {
+        av_log(avctx, AV_LOG_ERROR, "Incomplete packet\n");
+        return AVERROR_INVALIDDATA;
+    }
+    get_bits_align32(gb);
+
+    frame->nb_samples = s->block_size / avctx->channels;
+    *got_frame_ptr    = 1;
+
+    return consumed;
+}
+
+AVCodec ff_binkaudio_rdft_decoder = {
+    .name           = "binkaudio_rdft",
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_BINKAUDIO_RDFT,
+    .priv_data_size = sizeof(BinkAudioContext),
+    .init           = decode_init,
+    .close          = decode_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Bink Audio (RDFT)")
+};
+
+AVCodec ff_binkaudio_dct_decoder = {
+    .name           = "binkaudio_dct",
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_BINKAUDIO_DCT,
+    .priv_data_size = sizeof(BinkAudioContext),
+    .init           = decode_init,
+    .close          = decode_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Bink Audio (DCT)")
+};