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opus_rc: fix encoder desyncs on very low bitrates

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Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
This commit is contained in:
Rostislav Pehlivanov 2017-07-10 23:40:35 +01:00
parent 8041b2420f
commit e7d977b446
1 changed files with 10 additions and 7 deletions
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17
libavcodec/opus_rc.c
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@ -381,18 +381,21 @@ void ff_opus_rc_enc_end(OpusRangeCoder *rc, uint8_t *dst, int size)
opus_rc_enc_carryout(rc, 0);
rng_bytes = rc->rng_cur - rc->buf;
rc->waste = (size - (rc->rb.bytes + rng_bytes)) << 3;
memcpy(dst, rc->buf, rng_bytes);
memset(dst + rng_bytes, 0, FFMAX(rc->waste >> 3, 0) + 1);
rc->waste = size*8 - (rc->rb.bytes*8 + rc->rb.cachelen) - rng_bytes*8;
/* Put the rawbits part, if any */
if (rc->rb.bytes || rc->rb.cachelen) {
int rawbytes = FFALIGN(rc->rb.bytes*8 + rc->rb.cachelen, 8) >> 3;
int dst_loc = FFMAX(size - rawbytes, 0);
uint8_t *src = rc->buf + OPUS_MAX_PACKET_SIZE + 12 - rawbytes;
int i, lap;
uint8_t *rb_src, *rb_dst;
ff_opus_rc_put_raw(rc, 0, 32 - rc->rb.cachelen);
dst[dst_loc] |= *src++;
memcpy(&dst[dst_loc + 1], src, rawbytes - 1);
rb_src = rc->buf + OPUS_MAX_PACKET_SIZE + 12 - rc->rb.bytes;
rb_dst = dst + FFMAX(size - rc->rb.bytes, 0);
lap = &dst[rng_bytes] - rb_dst;
for (i = 0; i < lap; i++)
rb_dst[i] |= rb_src[i];
memcpy(&rb_dst[lap], &rb_src[lap], FFMAX(rc->rb.bytes - lap, 0));
}
}