Okayed parts of nellymoserenc.c

Originally committed as revision 15039 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/nellymoserenc.c b/libavcodec/nellymoserenc.c
new file mode 100644 (file)
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+++ b/libavcodec/nellymoserenc.c
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+/*
+ * 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 nellymoserenc.c
+ * Nellymoser encoder
+ * by Bartlomiej Wolowiec
+ *
+ * Generic codec information: libavcodec/nellymoserdec.c
+ *
+ * Some information also from: http://www1.mplayerhq.hu/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 "nellymoser.h"
+#include "avcodec.h"
+#include "dsputil.h"
+
+#define BITSTREAM_WRITER_LE
+#include "bitstream.h"
+
+#define POW_TABLE_SIZE (1<<11)
+#define POW_TABLE_OFFSET 3
+
+typedef struct NellyMoserEncodeContext {
+    AVCodecContext  *avctx;
+    int             last_frame;
+} 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 av_cold int encode_init(AVCodecContext *avctx)
+{
+    NellyMoserEncodeContext *s = avctx->priv_data;
+    int i;
+
+    if (avctx->channels != 1) {
+        av_log(avctx, AV_LOG_ERROR, "Nellymoser supports only 1 channel\n");
+        return -1;
+    }
+
+    avctx->frame_size = NELLY_SAMPLES;
+    s->avctx = avctx;
+    ff_mdct_init(&s->mdct_ctx, 8, 0);
+    dsputil_init(&s->dsp, avctx);
+
+    /* Generate overlap window */
+    ff_sine_window_init(ff_sine_128, 128);
+    for (i = 0; i < POW_TABLE_SIZE; i++)
+        pow_table[i] = -pow(2, -i / 2048.0 - 3.0 + POW_TABLE_OFFSET);
+
+    return 0;
+}
+
+static av_cold int encode_end(AVCodecContext *avctx)
+{
+    NellyMoserEncodeContext *s = avctx->priv_data;
+
+    ff_mdct_end(&s->mdct_ctx);
+    return 0;
+}
+
+AVCodec nellymoser_encoder = {
+    .name = "nellymoser",
+    .type = CODEC_TYPE_AUDIO,
+    .id = CODEC_ID_NELLYMOSER,
+    .priv_data_size = sizeof(NellyMoserEncodeContext),
+    .init = encode_init,
+    .encode = encode_frame,
+    .close = encode_end,
+    .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
+    .long_name = NULL_IF_CONFIG_SMALL("Nellymoser Asao Codec"),
+};