diff options
author | Justin Ruggles <justin.ruggles@gmail.com> | 2010-07-31 20:37:23 +0400 |
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committer | Justin Ruggles <justin.ruggles@gmail.com> | 2010-07-31 20:37:23 +0400 |
commit | 93d65e3d92623500b69fe7ccba43f6b6266c3250 (patch) | |
tree | 16b232ab4161b84a1150ec4767115558f19e5542 /libavcodec/flacenc.c | |
parent | fa738b3ad1c5b071ebd8d13170cbc7f27c5cc6d1 (diff) |
Estimate frame size during encoding.
Originally committed as revision 24619 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/flacenc.c')
-rw-r--r-- | libavcodec/flacenc.c | 54 |
1 files changed, 51 insertions, 3 deletions
diff --git a/libavcodec/flacenc.c b/libavcodec/flacenc.c index 57c0a65726..7eabd9c994 100644 --- a/libavcodec/flacenc.c +++ b/libavcodec/flacenc.c @@ -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); |