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avcodec/mpeg4videoenc: Add Mpeg4EncContext and move time_increment_bits

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It is only ever used by the main encoder thread.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-03-02 01:03:10 +01:00
parent e8a8a13128
commit fca1ac2cba
4 changed files with 30 additions and 15 deletions
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36
libavcodec/mpeg4videoenc.c
View File

@ -71,6 +71,17 @@ static uint8_t uni_mpeg4_inter_rl_len[64 * 64 * 2 * 2];
* max run: 29/41
*/
typedef struct Mpeg4EncContext {
MPVMainEncContext m;
/// number of bits to represent the fractional part of time
int time_increment_bits;
} Mpeg4EncContext;
static inline Mpeg4EncContext *mainctx_to_mpeg4(MPVMainEncContext *m)
{
return (Mpeg4EncContext*)m;
}
/**
* Return the number of bits that encoding the 8x8 block in block would need.
* @param[in] block_last_index last index in scantable order that refers to a non zero element in block.
@ -960,10 +971,11 @@ static void mpeg4_encode_visual_object_header(MpegEncContext *s)
ff_mpeg4_stuffing(&s->pb);
}
static void mpeg4_encode_vol_header(MpegEncContext *s,
static void mpeg4_encode_vol_header(Mpeg4EncContext *const m4,
int vo_number,
int vol_number)
{
MpegEncContext *const s = &m4->m.s;
int vo_ver_id, vo_type, aspect_ratio_info;
if (s->max_b_frames || s->quarter_sample) {
@ -1002,8 +1014,8 @@ static void mpeg4_encode_vol_header(MpegEncContext *s,
put_bits(&s->pb, 1, 1); /* marker bit */
put_bits(&s->pb, 16, s->avctx->time_base.den);
if (s->time_increment_bits < 1)
s->time_increment_bits = 1;
if (m4->time_increment_bits < 1)
m4->time_increment_bits = 1;
put_bits(&s->pb, 1, 1); /* marker bit */
put_bits(&s->pb, 1, 0); /* fixed vop rate=no */
put_bits(&s->pb, 1, 1); /* marker bit */
@ -1050,8 +1062,10 @@ static void mpeg4_encode_vol_header(MpegEncContext *s,
}
/* write MPEG-4 VOP header */
int ff_mpeg4_encode_picture_header(MpegEncContext *s)
int ff_mpeg4_encode_picture_header(MPVMainEncContext *const m)
{
Mpeg4EncContext *const m4 = mainctx_to_mpeg4(m);
MpegEncContext *const s = &m->s;
uint64_t time_incr;
int64_t time_div, time_mod;
@ -1060,7 +1074,7 @@ int ff_mpeg4_encode_picture_header(MpegEncContext *s)
if (s->avctx->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) // HACK, the reference sw is buggy
mpeg4_encode_visual_object_header(s);
if (s->avctx->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || s->picture_number == 0) // HACK, the reference sw is buggy
mpeg4_encode_vol_header(s, 0, 0);
mpeg4_encode_vol_header(m4, 0, 0);
}
mpeg4_encode_gop_header(s);
}
@ -1085,7 +1099,7 @@ int ff_mpeg4_encode_picture_header(MpegEncContext *s)
put_bits(&s->pb, 1, 0);
put_bits(&s->pb, 1, 1); /* marker */
put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
put_bits(&s->pb, m4->time_increment_bits, time_mod); /* time increment */
put_bits(&s->pb, 1, 1); /* marker */
put_bits(&s->pb, 1, 1); /* vop coded */
if (s->pict_type == AV_PICTURE_TYPE_P) {
@ -1276,7 +1290,8 @@ static av_cold void mpeg4_encode_init_static(void)
static av_cold int encode_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
MpegEncContext *s = avctx->priv_data;
Mpeg4EncContext *const m4 = avctx->priv_data;
MpegEncContext *const s = &m4->m.s;
int ret;
if (avctx->width >= (1<<13) || avctx->height >= (1<<13)) {
@ -1290,7 +1305,10 @@ static av_cold int encode_init(AVCodecContext *avctx)
ff_thread_once(&init_static_once, mpeg4_encode_init_static);
m4->time_increment_bits = av_log2(avctx->time_base.den - 1) + 1;
s->fcode_tab = fcode_tab + MAX_MV;
s->min_qcoeff = -2048;
s->max_qcoeff = 2047;
s->intra_ac_vlc_length = uni_mpeg4_intra_rl_len;
@ -1309,7 +1327,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
init_put_bits(&s->pb, s->avctx->extradata, 1024);
mpeg4_encode_visual_object_header(s);
mpeg4_encode_vol_header(s, 0, 0);
mpeg4_encode_vol_header(m4, 0, 0);
// ff_mpeg4_stuffing(&s->pb); ?
flush_put_bits(&s->pb);
@ -1395,7 +1413,7 @@ const FFCodec ff_mpeg4_encoder = {
CODEC_LONG_NAME("MPEG-4 part 2"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MPEG4,
.priv_data_size = sizeof(MPVMainEncContext),
.priv_data_size = sizeof(Mpeg4EncContext),
.init = encode_init,
FF_CODEC_ENCODE_CB(ff_mpv_encode_picture),
.close = ff_mpv_encode_end,

4
libavcodec/mpeg4videoenc.h
View File

@ -25,14 +25,14 @@
#include <stdint.h>
#include "mpegvideo.h"
#include "mpegvideoenc.h"
#include "put_bits.h"
void ff_mpeg4_encode_mb(MpegEncContext *s,
int16_t block[6][64],
int motion_x, int motion_y);
void ff_set_mpeg4_time(MpegEncContext *s);
int ff_mpeg4_encode_picture_header(MpegEncContext *s);
int ff_mpeg4_encode_picture_header(MPVMainEncContext *m);
void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
void ff_mpeg4_stuffing(PutBitContext *pbc);

2
libavcodec/mpegvideo.h
View File

@ -362,8 +362,6 @@ typedef struct MpegEncContext {
/* MPEG-4 specific */
int studio_profile;
int dct_precision;
/// number of bits to represent the fractional part of time (encoder only)
int time_increment_bits;
int last_time_base;
int time_base; ///< time in seconds of last I,P,S Frame
int64_t time; ///< time of current frame

3
libavcodec/mpegvideo_enc.c
View File

@ -746,7 +746,6 @@ av_cold int ff_mpv_encode_init(AVCodecContext *avctx)
(1 << 16) - 1);
return AVERROR(EINVAL);
}
s->time_increment_bits = av_log2(avctx->time_base.den - 1) + 1;
switch (avctx->codec->id) {
#if CONFIG_MPEG1VIDEO_ENCODER || CONFIG_MPEG2VIDEO_ENCODER
@ -3919,7 +3918,7 @@ static int encode_picture(MPVMainEncContext *const m, const AVPacket *pkt)
ff_msmpeg4_encode_picture_header(s);
#endif
else if (CONFIG_MPEG4_ENCODER && s->h263_pred) {
ret = ff_mpeg4_encode_picture_header(s);
ret = ff_mpeg4_encode_picture_header(m);
if (ret < 0)
return ret;
} else if (CONFIG_RV10_ENCODER && s->codec_id == AV_CODEC_ID_RV10) {