adding ffmpeg specific version

1 files changed, 268 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/eac3enc.c b/ffmpeg1/libavcodec/eac3enc.c
new file mode 100644
index 0000000..bb9ef4f
--- /dev/null
+++ b/ffmpeg1/libavcodec/eac3enc.c
@@ -0,0 +1,268 @@
+/*
+ * E-AC-3 encoder
+ * Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * E-AC-3 encoder
+ */
+
+#define CONFIG_AC3ENC_FLOAT 1
+#include "ac3enc.h"
+#include "eac3enc.h"
+#include "eac3_data.h"
+
+
+#define AC3ENC_TYPE AC3ENC_TYPE_EAC3
+#include "ac3enc_opts_template.c"
+
+static const AVClass eac3enc_class = {
+    .class_name = "E-AC-3 Encoder",
+    .item_name  = av_default_item_name,
+    .option     = ac3_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+/**
+ * LUT for finding a matching frame exponent strategy index from a set of
+ * exponent strategies for a single channel across all 6 blocks.
+ */
+static int8_t eac3_frame_expstr_index_tab[3][4][4][4][4][4];
+
+
+void ff_eac3_exponent_init(void)
+{
+    int i;
+
+    memset(eac3_frame_expstr_index_tab, -1, sizeof(eac3_frame_expstr_index_tab));
+    for (i = 0; i < 32; i++) {
+        eac3_frame_expstr_index_tab[ff_eac3_frm_expstr[i][0]-1]
+                                   [ff_eac3_frm_expstr[i][1]]
+                                   [ff_eac3_frm_expstr[i][2]]
+                                   [ff_eac3_frm_expstr[i][3]]
+                                   [ff_eac3_frm_expstr[i][4]]
+                                   [ff_eac3_frm_expstr[i][5]] = i;
+    }
+}
+
+
+void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s)
+{
+    int ch;
+
+    if (s->num_blocks < 6) {
+        s->use_frame_exp_strategy = 0;
+        return;
+    }
+
+    s->use_frame_exp_strategy = 1;
+    for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
+        int expstr = eac3_frame_expstr_index_tab[s->exp_strategy[ch][0]-1]
+                                                [s->exp_strategy[ch][1]]
+                                                [s->exp_strategy[ch][2]]
+                                                [s->exp_strategy[ch][3]]
+                                                [s->exp_strategy[ch][4]]
+                                                [s->exp_strategy[ch][5]];
+        if (expstr < 0) {
+            s->use_frame_exp_strategy = 0;
+            break;
+        }
+        s->frame_exp_strategy[ch] = expstr;
+    }
+}
+
+
+
+void ff_eac3_set_cpl_states(AC3EncodeContext *s)
+{
+    int ch, blk;
+    int first_cpl_coords[AC3_MAX_CHANNELS];
+
+    /* set first cpl coords */
+    for (ch = 1; ch <= s->fbw_channels; ch++)
+        first_cpl_coords[ch] = 1;
+    for (blk = 0; blk < s->num_blocks; blk++) {
+        AC3Block *block = &s->blocks[blk];
+        for (ch = 1; ch <= s->fbw_channels; ch++) {
+            if (block->channel_in_cpl[ch]) {
+                if (first_cpl_coords[ch]) {
+                    block->new_cpl_coords[ch] = 2;
+                    first_cpl_coords[ch]  = 0;
+                }
+            } else {
+                first_cpl_coords[ch] = 1;
+            }
+        }
+    }
+
+    /* set first cpl leak */
+    for (blk = 0; blk < s->num_blocks; blk++) {
+        AC3Block *block = &s->blocks[blk];
+        if (block->cpl_in_use) {
+            block->new_cpl_leak = 2;
+            break;
+        }
+    }
+}
+
+
+void ff_eac3_output_frame_header(AC3EncodeContext *s)
+{
+    int blk, ch;
+    AC3EncOptions *opt = &s->options;
+
+    put_bits(&s->pb, 16, 0x0b77);                   /* sync word */
+
+    /* BSI header */
+    put_bits(&s->pb,  2, 0);                        /* stream type = independent */
+    put_bits(&s->pb,  3, 0);                        /* substream id = 0 */
+    put_bits(&s->pb, 11, (s->frame_size / 2) - 1);  /* frame size */
+    if (s->bit_alloc.sr_shift) {
+        put_bits(&s->pb, 2, 0x3);                   /* fscod2 */
+        put_bits(&s->pb, 2, s->bit_alloc.sr_code);  /* sample rate code */
+    } else {
+        put_bits(&s->pb, 2, s->bit_alloc.sr_code);  /* sample rate code */
+        put_bits(&s->pb, 2, s->num_blks_code);      /* number of blocks */
+    }
+    put_bits(&s->pb, 3, s->channel_mode);           /* audio coding mode */
+    put_bits(&s->pb, 1, s->lfe_on);                 /* LFE channel indicator */
+    put_bits(&s->pb, 5, s->bitstream_id);           /* bitstream id (EAC3=16) */
+    put_bits(&s->pb, 5, -opt->dialogue_level);      /* dialogue normalization level */
+    put_bits(&s->pb, 1, 0);                         /* no compression gain */
+    /* mixing metadata*/
+    put_bits(&s->pb, 1, opt->eac3_mixing_metadata);
+    if (opt->eac3_mixing_metadata) {
+        if (s->channel_mode > AC3_CHMODE_STEREO)
+            put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
+        if (s->has_center) {
+            put_bits(&s->pb, 3, s->ltrt_center_mix_level);
+            put_bits(&s->pb, 3, s->loro_center_mix_level);
+        }
+        if (s->has_surround) {
+            put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
+            put_bits(&s->pb, 3, s->loro_surround_mix_level);
+        }
+        if (s->lfe_on)
+            put_bits(&s->pb, 1, 0);
+        put_bits(&s->pb, 1, 0);                     /* no program scale */
+        put_bits(&s->pb, 1, 0);                     /* no ext program scale */
+        put_bits(&s->pb, 2, 0);                     /* no mixing parameters */
+        if (s->channel_mode < AC3_CHMODE_STEREO)
+            put_bits(&s->pb, 1, 0);                 /* no pan info */
+        put_bits(&s->pb, 1, 0);                     /* no frame mix config info */
+    }
+    /* info metadata*/
+    put_bits(&s->pb, 1, opt->eac3_info_metadata);
+    if (opt->eac3_info_metadata) {
+        put_bits(&s->pb, 3, s->bitstream_mode);
+        put_bits(&s->pb, 1, opt->copyright);
+        put_bits(&s->pb, 1, opt->original);
+        if (s->channel_mode == AC3_CHMODE_STEREO) {
+            put_bits(&s->pb, 2, opt->dolby_surround_mode);
+            put_bits(&s->pb, 2, opt->dolby_headphone_mode);
+        }
+        if (s->channel_mode >= AC3_CHMODE_2F2R)
+            put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
+        put_bits(&s->pb, 1, opt->audio_production_info);
+        if (opt->audio_production_info) {
+            put_bits(&s->pb, 5, opt->mixing_level - 80);
+            put_bits(&s->pb, 2, opt->room_type);
+            put_bits(&s->pb, 1, opt->ad_converter_type);
+        }
+        put_bits(&s->pb, 1, 0);
+    }
+    if (s->num_blocks != 6)
+        put_bits(&s->pb, 1, !(s->avctx->frame_number % 6)); /* converter sync flag */
+    put_bits(&s->pb, 1, 0);                         /* no additional bit stream info */
+
+    /* frame header */
+    if (s->num_blocks == 6) {
+    put_bits(&s->pb, 1, !s->use_frame_exp_strategy);/* exponent strategy syntax */
+    put_bits(&s->pb, 1, 0);                         /* aht enabled = no */
+    }
+    put_bits(&s->pb, 2, 0);                         /* snr offset strategy = 1 */
+    put_bits(&s->pb, 1, 0);                         /* transient pre-noise processing enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* block switch syntax enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* dither flag syntax enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* bit allocation model syntax enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* fast gain codes enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* dba syntax enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* skip field syntax enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* spx enabled = no */
+    /* coupling strategy use flags */
+    if (s->channel_mode > AC3_CHMODE_MONO) {
+        put_bits(&s->pb, 1, s->blocks[0].cpl_in_use);
+        for (blk = 1; blk < s->num_blocks; blk++) {
+            AC3Block *block = &s->blocks[blk];
+            put_bits(&s->pb, 1, block->new_cpl_strategy);
+            if (block->new_cpl_strategy)
+                put_bits(&s->pb, 1, block->cpl_in_use);
+        }
+    }
+    /* exponent strategy */
+    if (s->use_frame_exp_strategy) {
+        for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++)
+            put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
+    } else {
+        for (blk = 0; blk < s->num_blocks; blk++)
+            for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++)
+                put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
+    }
+    if (s->lfe_on) {
+        for (blk = 0; blk < s->num_blocks; blk++)
+            put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
+    }
+    /* E-AC-3 to AC-3 converter exponent strategy (not optional when num blocks == 6) */
+    if (s->num_blocks != 6) {
+        put_bits(&s->pb, 1, 0);
+    } else {
+    for (ch = 1; ch <= s->fbw_channels; ch++) {
+        if (s->use_frame_exp_strategy)
+            put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
+        else
+            put_bits(&s->pb, 5, 0);
+    }
+    }
+    /* snr offsets */
+    put_bits(&s->pb, 6, s->coarse_snr_offset);
+    put_bits(&s->pb, 4, s->fine_snr_offset[1]);
+    /* block start info */
+    if (s->num_blocks > 1)
+        put_bits(&s->pb, 1, 0);
+}
+
+
+#if CONFIG_EAC3_ENCODER
+AVCodec ff_eac3_encoder = {
+    .name            = "eac3",
+    .type            = AVMEDIA_TYPE_AUDIO,
+    .id              = AV_CODEC_ID_EAC3,
+    .priv_data_size  = sizeof(AC3EncodeContext),
+    .init            = ff_ac3_encode_init,
+    .encode2         = ff_ac3_float_encode_frame,
+    .close           = ff_ac3_encode_close,
+    .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
+                                                      AV_SAMPLE_FMT_NONE },
+    .long_name       = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"),
+    .priv_class      = &eac3enc_class,
+    .channel_layouts = ff_ac3_channel_layouts,
+    .defaults        = ac3_defaults,
+};
+#endif