generic-library/ffmpeg
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Turn on AAC rate control.

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Originally committed as revision 19379 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse 2009-07-08 23:04:22 +00:00
parent c8f47d8b79
commit 7a4eebcdce
2 changed files with 6 additions and 14 deletions
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19
libavcodec/aaccoder.c
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@ -457,15 +457,6 @@ static void encode_window_bands_info(AACEncContext *s, SingleChannelElement *sce
}
}
static void encode_window_bands_info_fixed(AACEncContext *s,
SingleChannelElement *sce,
int win, int group_len,
const float lambda)
{
encode_window_bands_info(s, sce, win, group_len, 1.0f);
}
typedef struct TrellisPath {
float cost;
int prev;
@ -700,7 +691,7 @@ static void search_for_quantizers_twoloop(AVCodecContext *avctx,
sce->ics.swb_sizes[g],
sce->sf_idx[w*16+g],
ESC_BT,
1.0,
lambda,
INFINITY,
&b);
bb += b;
@ -710,7 +701,7 @@ static void search_for_quantizers_twoloop(AVCodecContext *avctx,
minbits = bb;
}
}
dists[w*16+g] = mindist - minbits;
dists[w*16+g] = (mindist - minbits) / lambda;
bits = minbits;
if (prev != -1) {
bits += ff_aac_scalefactor_bits[sce->sf_idx[w*16+g] - prev + SCALE_DIFF_ZERO];
@ -870,12 +861,12 @@ static void search_for_quantizers_faac(AVCodecContext *avctx, AACEncContext *s,
sce->ics.swb_sizes[g],
scf,
ESC_BT,
1.0,
lambda,
INFINITY,
&b);
dist -= b;
}
dist *= 1.0f/512.0f;
dist *= 1.0f / 512.0f / lambda;
quant_max = quant(maxq[w*16+g], ff_aac_pow2sf_tab[200 - scf + SCALE_ONE_POS - SCALE_DIV_512]);
if (quant_max >= 8191) { // too much, return to the previous quantizer
sce->sf_idx[w*16+g] = prev_scf;
@ -1019,7 +1010,7 @@ static void search_for_ms(AACEncContext *s, ChannelElement *cpe,
AACCoefficientsEncoder ff_aac_coders[] = {
{
search_for_quantizers_faac,
encode_window_bands_info_fixed,
encode_window_bands_info,
quantize_and_encode_band,
// search_for_ms,
},

1
libavcodec/aacenc.c
View File

@ -583,6 +583,7 @@ static int aac_encode_frame(AVCodecContext *avctx,
if (!(avctx->flags & CODEC_FLAG_QSCALE)) {
float ratio = avctx->bit_rate * 1024.0f / avctx->sample_rate / avctx->frame_bits;
s->lambda *= ratio;
s->lambda = fminf(s->lambda, 65536.f);
}
if (avctx->frame_bits > 6144*avctx->channels)