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avcodec/mpeg12enc, speedhqenc: Optimize writing escape codes

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Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-03-19 12:26:47 +01:00
parent a064d34a32
commit 6ebc810e6f
2 changed files with 8 additions and 10 deletions
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9
libavcodec/mpeg12enc.c
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@ -628,12 +628,11 @@ next_coef:
put_bits(&s->pb, table_vlc[code][1] + 1, put_bits(&s->pb, table_vlc[code][1] + 1,
(table_vlc[code][0] << 1) + sign); (table_vlc[code][0] << 1) + sign);
} else { } else {
/* Escape seems to be pretty rare <5% so I do not optimize it; /* Escape seems to be pretty rare <5% so I do not optimize it.
* the following value is the common escape value for both * The following encodes run together with the common escape
* possible tables (i.e. table_vlc[111]). */ * value of both tables 000001b. */
put_bits(&s->pb, 6, 0x01); put_bits(&s->pb, 6 + 6, 0x01 << 6 | run);
/* escape: only clip in this case */ /* escape: only clip in this case */
put_bits(&s->pb, 6, run);
if (s->c.codec_id == AV_CODEC_ID_MPEG1VIDEO) { if (s->c.codec_id == AV_CODEC_ID_MPEG1VIDEO) {
if (alevel < 128) { if (alevel < 128) {
put_sbits(&s->pb, 8, level); put_sbits(&s->pb, 8, level);

9
libavcodec/speedhqenc.c
View File

@ -194,11 +194,10 @@ static void encode_block(MPVEncContext *const s, const int16_t block[], int n)
ff_speedhq_vlc_table[code][0] | (sign << ff_speedhq_vlc_table[code][1])); ff_speedhq_vlc_table[code][0] | (sign << ff_speedhq_vlc_table[code][1]));
} else { } else {
/* escape seems to be pretty rare <5% so I do not optimize it; /* escape seems to be pretty rare <5% so I do not optimize it;
* the values correspond to ff_speedhq_vlc_table[121] */ * The following encodes the escape value 100000b together with
put_bits_le(&s->pb, 6, 32); * run and level. */
/* escape: only clip in this case */ put_bits_le(&s->pb, 6 + 6 + 12, 0x20 | run << 6 |
put_bits_le(&s->pb, 6, run); (level + 2048) << 12);
put_bits_le(&s->pb, 12, level + 2048);
} }
last_non_zero = i; last_non_zero = i;
} }