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Estimate frame size during encoding.

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Originally committed as revision 24619 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2010-07-31 16:37:23 +00:00
parent fa738b3ad1
commit 93d65e3d92
1 changed files with 51 additions and 3 deletions
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54
libavcodec/flacenc.c
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@ -791,7 +791,7 @@ static void encode_residual_lpc(int32_t *res, const int32_t *smp, int n,
}
static int encode_residual(FlacEncodeContext *s, int ch)
static int encode_residual_ch(FlacEncodeContext *s, int ch)
{
int i, n;
int min_order, max_order, opt_order, precision, omethod;
@ -936,6 +936,55 @@ static int encode_residual(FlacEncodeContext *s, int ch)
}
static int count_frame_header(FlacEncodeContext *s)
{
uint8_t tmp;
int count;
/*
<14> Sync code
<1> Reserved
<1> Blocking strategy
<4> Block size in inter-channel samples
<4> Sample rate
<4> Channel assignment
<3> Sample size in bits
<1> Reserved
*/
count = 32;
/* coded frame number */
PUT_UTF8(s->frame_count, tmp, count += 8;)
/* explicit block size */
count += FFMAX(0, s->frame.bs_code[0] - 5) * 8;
/* explicit sample rate */
count += ((s->sr_code[0] == 12) + (s->sr_code[0] > 12)) * 8;
/* frame header CRC-8 */
count += 8;
return count;
}
static int encode_frame(FlacEncodeContext *s)
{
int ch, count;
count = count_frame_header(s);
for (ch = 0; ch < s->channels; ch++)
count += encode_residual_ch(s, ch);
count += (8 - (count & 7)) & 7; // byte alignment
count += 16; // CRC-16
return count >> 3;
}
static int encode_residual_v(FlacEncodeContext *s, int ch)
{
int i, n;
@ -1214,8 +1263,7 @@ static int flac_encode_frame(AVCodecContext *avctx, uint8_t *frame,
channel_decorrelation(s);
for (ch = 0; ch < s->channels; ch++)
encode_residual(s, ch);
encode_frame(s);
write_frame:
init_put_bits(&s->pb, frame, buf_size);