making act segmenter

1 files changed, 182 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/libspeexdec.c b/ffmpeg/libavcodec/libspeexdec.c
new file mode 100644
index 0000000..7c1ffa6
--- /dev/null
+++ b/ffmpeg/libavcodec/libspeexdec.c
@@ -0,0 +1,182 @@
+/*
+ * Copyright (C) 2008 David Conrad
+ *
+ * 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
+ */
+
+#include <speex/speex.h>
+#include <speex/speex_header.h>
+#include <speex/speex_stereo.h>
+#include <speex/speex_callbacks.h>
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/common.h"
+#include "avcodec.h"
+#include "internal.h"
+
+typedef struct {
+    SpeexBits bits;
+    SpeexStereoState stereo;
+    void *dec_state;
+    int frame_size;
+} LibSpeexContext;
+
+
+static av_cold int libspeex_decode_init(AVCodecContext *avctx)
+{
+    LibSpeexContext *s = avctx->priv_data;
+    const SpeexMode *mode;
+    SpeexHeader *header = NULL;
+    int spx_mode;
+
+    avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+    if (avctx->extradata && avctx->extradata_size >= 80) {
+        header = speex_packet_to_header(avctx->extradata,
+                                        avctx->extradata_size);
+        if (!header)
+            av_log(avctx, AV_LOG_WARNING, "Invalid Speex header\n");
+    }
+    if (header) {
+        avctx->sample_rate = header->rate;
+        avctx->channels    = header->nb_channels;
+        spx_mode           = header->mode;
+        speex_header_free(header);
+    } else {
+        switch (avctx->sample_rate) {
+        case 8000:  spx_mode = 0; break;
+        case 16000: spx_mode = 1; break;
+        case 32000: spx_mode = 2; break;
+        default:
+            /* libspeex can handle any mode if initialized as ultra-wideband */
+            av_log(avctx, AV_LOG_WARNING, "Invalid sample rate: %d\n"
+                                          "Decoding as 32kHz ultra-wideband\n",
+                                          avctx->sample_rate);
+            spx_mode = 2;
+        }
+    }
+
+    mode = speex_lib_get_mode(spx_mode);
+    if (!mode) {
+        av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", spx_mode);
+        return AVERROR_INVALIDDATA;
+    }
+    s->frame_size      =  160 << spx_mode;
+    if (!avctx->sample_rate)
+        avctx->sample_rate = 8000 << spx_mode;
+
+    if (avctx->channels < 1 || avctx->channels > 2) {
+        /* libspeex can handle mono or stereo if initialized as stereo */
+        av_log(avctx, AV_LOG_ERROR, "Invalid channel count: %d.\n"
+                                    "Decoding as stereo.\n", avctx->channels);
+        avctx->channels = 2;
+    }
+    avctx->channel_layout = avctx->channels == 2 ? AV_CH_LAYOUT_STEREO :
+                                                   AV_CH_LAYOUT_MONO;
+
+    speex_bits_init(&s->bits);
+    s->dec_state = speex_decoder_init(mode);
+    if (!s->dec_state) {
+        av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder.\n");
+        return -1;
+    }
+
+    if (avctx->channels == 2) {
+        SpeexCallback callback;
+        callback.callback_id = SPEEX_INBAND_STEREO;
+        callback.func = speex_std_stereo_request_handler;
+        callback.data = &s->stereo;
+        s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT;
+        speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback);
+    }
+
+    return 0;
+}
+
+static int libspeex_decode_frame(AVCodecContext *avctx, void *data,
+                                 int *got_frame_ptr, AVPacket *avpkt)
+{
+    uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    LibSpeexContext *s = avctx->priv_data;
+    AVFrame *frame     = data;
+    int16_t *output;
+    int ret, consumed = 0;
+
+    /* get output buffer */
+    frame->nb_samples = s->frame_size;
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+        return ret;
+    output = (int16_t *)frame->data[0];
+
+    /* if there is not enough data left for the smallest possible frame or the
+       next 5 bits are a terminator code, reset the libspeex buffer using the
+       current packet, otherwise ignore the current packet and keep decoding
+       frames from the libspeex buffer. */
+    if (speex_bits_remaining(&s->bits) < 5 ||
+        speex_bits_peek_unsigned(&s->bits, 5) == 0xF) {
+        /* check for flush packet */
+        if (!buf || !buf_size) {
+            *got_frame_ptr = 0;
+            return buf_size;
+        }
+        /* set new buffer */
+        speex_bits_read_from(&s->bits, buf, buf_size);
+        consumed = buf_size;
+    }
+
+    /* decode a single frame */
+    ret = speex_decode_int(s->dec_state, &s->bits, output);
+    if (ret <= -2) {
+        av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n");
+        return AVERROR_INVALIDDATA;
+    }
+    if (avctx->channels == 2)
+        speex_decode_stereo_int(output, s->frame_size, &s->stereo);
+
+    *got_frame_ptr = 1;
+
+    return consumed;
+}
+
+static av_cold int libspeex_decode_close(AVCodecContext *avctx)
+{
+    LibSpeexContext *s = avctx->priv_data;
+
+    speex_bits_destroy(&s->bits);
+    speex_decoder_destroy(s->dec_state);
+
+    return 0;
+}
+
+static av_cold void libspeex_decode_flush(AVCodecContext *avctx)
+{
+    LibSpeexContext *s = avctx->priv_data;
+    speex_bits_reset(&s->bits);
+}
+
+AVCodec ff_libspeex_decoder = {
+    .name           = "libspeex",
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_SPEEX,
+    .priv_data_size = sizeof(LibSpeexContext),
+    .init           = libspeex_decode_init,
+    .close          = libspeex_decode_close,
+    .decode         = libspeex_decode_frame,
+    .flush          = libspeex_decode_flush,
+    .capabilities   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY | CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("libspeex Speex"),
+};