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multi-stream fix when setting bitrate to AUTO, MAX, or small values

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OPUS_AUTO should now work fine, while using OPUS_BITRATE_MAX would still
be a bad idea for controlling CBR rate for multistream. The encoder should
now throw an error early on if max_data_bytes is just too small to do anything.
This commit is contained in:
Jean-Marc Valin 2014-06-21 01:16:46 -04:00
parent b9df889586
commit 8dc91de172
1 changed files with 30 additions and 4 deletions
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34
src/opus_multistream_encoder.c
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@ -591,7 +591,7 @@ OpusMSEncoder *opus_multistream_surround_encoder_create(
return st;
}
static void surround_rate_allocation(
static opus_int32 surround_rate_allocation(
OpusMSEncoder *st,
opus_int32 *rate,
int frame_size
@ -605,6 +605,7 @@ static void surround_rate_allocation(
int lfe_offset;
int coupled_ratio; /* Q8 */
int lfe_ratio; /* Q8 */
opus_int32 rate_sum=0;
ptr = (char*)st + align(sizeof(OpusMSEncoder));
opus_encoder_ctl((OpusEncoder*)ptr, OPUS_GET_SAMPLE_RATE(&Fs));
@ -660,7 +661,10 @@ static void surround_rate_allocation(
rate[i] = stream_offset+channel_rate;
else
rate[i] = lfe_offset+(channel_rate*lfe_ratio>>8);
rate[i] = IMAX(rate[i], 500);
rate_sum += rate[i];
}
return rate_sum;
}
/* Max size in case the encoder decides to return three frames */
@ -695,6 +699,8 @@ static int opus_multistream_encode_native
opus_val32 *mem = NULL;
opus_val32 *preemph_mem=NULL;
int frame_size;
opus_int32 rate_sum;
opus_int32 smallest_packet;
ALLOC_STACK;
if (st->surround)
@ -738,6 +744,18 @@ static int opus_multistream_encode_native
RESTORE_STACK;
return OPUS_BAD_ARG;
}
/* Estimate (slightly overestimating) of the smallest packet the encoder can produce. */
if (50*frame_size <= Fs)
{
smallest_packet = st->layout.nb_streams*4;
} else {
smallest_packet = st->layout.nb_streams*4*50*frame_size/Fs;
}
if (max_data_bytes < smallest_packet)
{
RESTORE_STACK;
return OPUS_BAD_ARG;
}
ALLOC(buf, 2*frame_size, opus_val16);
coupled_size = opus_encoder_get_size(2);
mono_size = opus_encoder_get_size(1);
@ -755,11 +773,19 @@ static int opus_multistream_encode_native
}
/* Compute bitrate allocation between streams (this could be a lot better) */
surround_rate_allocation(st, bitrates, frame_size);
rate_sum = surround_rate_allocation(st, bitrates, frame_size);
if (!vbr)
max_data_bytes = IMIN(max_data_bytes, 3*st->bitrate_bps/(3*8*Fs/frame_size));
{
if (st->bitrate_bps == OPUS_AUTO)
{
max_data_bytes = IMIN(max_data_bytes, 3*rate_sum/(3*8*Fs/frame_size));
} else if (st->bitrate_bps != OPUS_BITRATE_MAX)
{
max_data_bytes = IMIN(max_data_bytes, IMAX(smallest_packet,
3*st->bitrate_bps/(3*8*Fs/frame_size)));
}
}
ptr = (char*)st + align(sizeof(OpusMSEncoder));
for (s=0;s<st->layout.nb_streams;s++)
{