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(e)ac3enc: select a default bit rate based on the channel layout

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This commit is contained in:
Justin Ruggles 2012-02-22 21:45:06 -05:00
parent 6aeea1dfb2
commit 4e99501f62
5 changed files with 20 additions and 0 deletions
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11
libavcodec/ac3enc.c
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@ -2141,6 +2141,17 @@ static av_cold int validate_options(AC3EncodeContext *s)
s->bit_alloc.sr_code = i % 3;
s->bitstream_id = s->eac3 ? 16 : 8 + s->bit_alloc.sr_shift;
/* select a default bit rate if not set by the user */
if (!avctx->bit_rate) {
switch (s->fbw_channels) {
case 1: avctx->bit_rate = 96000; break;
case 2: avctx->bit_rate = 192000; break;
case 3: avctx->bit_rate = 320000; break;
case 4: avctx->bit_rate = 384000; break;
case 5: avctx->bit_rate = 448000; break;
}
}
/* validate bit rate */
if (s->eac3) {
int max_br, min_br, wpf, min_br_dist, min_br_code;

1
libavcodec/ac3enc_fixed.c
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@ -151,4 +151,5 @@ AVCodec ff_ac3_fixed_encoder = {
.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
.priv_class = &ac3enc_class,
.channel_layouts = ff_ac3_channel_layouts,
.defaults = ac3_defaults,
};

1
libavcodec/ac3enc_float.c
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@ -149,5 +149,6 @@ AVCodec ff_ac3_encoder = {
.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
.priv_class = &ac3enc_class,
.channel_layouts = ff_ac3_channel_layouts,
.defaults = ac3_defaults,
};
#endif

6
libavcodec/ac3enc_opts_template.c
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@ -20,6 +20,7 @@
*/
#include "libavutil/opt.h"
#include "internal.h"
#include "ac3.h"
#if AC3ENC_TYPE == AC3ENC_TYPE_AC3_FIXED
@ -78,3 +79,8 @@ static const AVOption eac3_options[] = {
{"auto", "Selected by the Encoder", 0, AV_OPT_TYPE_CONST, {.dbl = AC3ENC_OPT_AUTO }, INT_MIN, INT_MAX, AC3ENC_PARAM, "cpl_start_band"},
{NULL}
};
static const AVCodecDefault ac3_defaults[] = {
{ "b", "0" },
{ NULL }
};

1
libavcodec/eac3enc.c
View File

@ -258,5 +258,6 @@ AVCodec ff_eac3_encoder = {
.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