Move E-AC-3 encoder functions to a separate eac3enc.c file.

1 files changed, 131 insertions, 0 deletions

diff --git a/libavcodec/eac3enc.c b/libavcodec/eac3enc.c
new file mode 100644
index 0000000000..20f4b879c6
--- /dev/null
+++ b/libavcodec/eac3enc.c
@@ -0,0 +1,131 @@
+/*
+ * 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"
+
+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 < AC3_MAX_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 = 2;
+                    first_cpl_coords[ch]  = 0;
+                }
+            } else {
+                first_cpl_coords[ch] = 1;
+            }
+        }
+    }
+
+    /* set first cpl leak */
+    for (blk = 0; blk < AC3_MAX_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, 0x3);                   /* number of blocks = 6 */
+    }
+    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 */
+    put_bits(&s->pb, 1, 0);                         /* no mixing metadata */
+    /* TODO: mixing metadata */
+    put_bits(&s->pb, 1, 0);                         /* no info metadata */
+    /* TODO: info metadata */
+    put_bits(&s->pb, 1, 0);                         /* no additional bit stream info */
+
+    /* frame header */
+    put_bits(&s->pb, 1, 1);                         /* exponent strategy syntax = each block */
+    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 < AC3_MAX_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 */
+    for (blk = 0; blk < AC3_MAX_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 < AC3_MAX_BLOCKS; blk++)
+            put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
+    }
+    /* E-AC-3 to AC-3 converter exponent strategy (unfortunately not optional...) */
+    for (ch = 1; ch <= s->fbw_channels; ch++)
+        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 */
+    put_bits(&s->pb, 1, 0);
+}