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avcodec/msmpeg4dec: Add MSMPEG4DecContext

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This is in preparation for further commits.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-03-15 07:42:26 +01:00
parent 0a9f58a7a1
commit f733cfca28
3 changed files with 26 additions and 16 deletions
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8
libavcodec/msmpeg4dec.c
View File

@ -845,7 +845,7 @@ const FFCodec ff_msmpeg4v1_decoder = {
CODEC_LONG_NAME("MPEG-4 part 2 Microsoft variant version 1"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MSMPEG4V1,
.priv_data_size = sizeof(MpegEncContext),
.priv_data_size = sizeof(MSMP4DecContext),
.init = ff_msmpeg4_decode_init,
FF_CODEC_DECODE_CB(ff_h263_decode_frame),
.close = ff_mpv_decode_close,
@ -860,7 +860,7 @@ const FFCodec ff_msmpeg4v2_decoder = {
CODEC_LONG_NAME("MPEG-4 part 2 Microsoft variant version 2"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MSMPEG4V2,
.priv_data_size = sizeof(MpegEncContext),
.priv_data_size = sizeof(MSMP4DecContext),
.init = ff_msmpeg4_decode_init,
FF_CODEC_DECODE_CB(ff_h263_decode_frame),
.close = ff_mpv_decode_close,
@ -875,7 +875,7 @@ const FFCodec ff_msmpeg4v3_decoder = {
CODEC_LONG_NAME("MPEG-4 part 2 Microsoft variant version 3"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MSMPEG4V3,
.priv_data_size = sizeof(MpegEncContext),
.priv_data_size = sizeof(MSMP4DecContext),
.init = ff_msmpeg4_decode_init,
FF_CODEC_DECODE_CB(ff_h263_decode_frame),
.close = ff_mpv_decode_close,
@ -890,7 +890,7 @@ const FFCodec ff_wmv1_decoder = {
CODEC_LONG_NAME("Windows Media Video 7"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_WMV1,
.priv_data_size = sizeof(MpegEncContext),
.priv_data_size = sizeof(MSMP4DecContext),
.init = ff_msmpeg4_decode_init,
FF_CODEC_DECODE_CB(ff_h263_decode_frame),
.close = ff_mpv_decode_close,

10
libavcodec/msmpeg4dec.h
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@ -28,6 +28,16 @@
#define INTER_INTRA_VLC_BITS 3
#define MB_NON_INTRA_VLC_BITS 9
typedef struct MSMP4DecContext {
MpegEncContext m;
} MSMP4DecContext;
static inline MSMP4DecContext *mpv_to_msmpeg4(MpegEncContext *s)
{
// Only legal because no MSMPEG-4 decoder uses slice-threading.
return (MSMP4DecContext*)s;
}
extern const VLCElem *ff_mb_non_intra_vlc[4];
extern VLCElem ff_inter_intra_vlc[8];

24
libavcodec/wmv2dec.c
View File

@ -37,7 +37,7 @@
#include "wmv2dec.h"
typedef struct WMV2DecContext {
MpegEncContext s;
MSMP4DecContext ms;
WMV2Context common;
IntraX8Context x8;
int j_type_bit;
@ -59,7 +59,7 @@ typedef struct WMV2DecContext {
static void wmv2_add_block(WMV2DecContext *w, int16_t *block1,
uint8_t *dst, int stride, int n)
{
MpegEncContext *const s = &w->s;
MpegEncContext *const s = &w->ms.m;
if (s->block_last_index[n] >= 0) {
switch (w->abt_type_table[n]) {
@ -103,7 +103,7 @@ static int parse_mb_skip(WMV2DecContext *w)
{
int mb_x, mb_y;
int coded_mb_count = 0;
MpegEncContext *const s = &w->s;
MpegEncContext *const s = &w->ms.m;
uint32_t *const mb_type = s->cur_pic.mb_type;
w->skip_type = get_bits(&s->gb, 2);
@ -166,7 +166,7 @@ static int parse_mb_skip(WMV2DecContext *w)
static int decode_ext_header(WMV2DecContext *w)
{
MpegEncContext *const s = &w->s;
MpegEncContext *const s = &w->ms.m;
GetBitContext gb;
int fps;
int code;
@ -336,8 +336,8 @@ int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
2 * s->qscale, (s->qscale - 1) | 1,
s->loop_filter, s->low_delay);
ff_er_add_slice(&w->s.er, 0, 0,
(w->s.mb_x >> 1) - 1, (w->s.mb_y >> 1) - 1,
ff_er_add_slice(&s->er, 0, 0,
(s->mb_x >> 1) - 1, (s->mb_y >> 1) - 1,
ER_MB_END);
return 1;
}
@ -347,7 +347,7 @@ int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
static inline void wmv2_decode_motion(WMV2DecContext *w, int *mx_ptr, int *my_ptr)
{
MpegEncContext *const s = &w->s;
MpegEncContext *const s = &w->ms.m;
ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
@ -359,7 +359,7 @@ static inline void wmv2_decode_motion(WMV2DecContext *w, int *mx_ptr, int *my_pt
static int16_t *wmv2_pred_motion(WMV2DecContext *w, int *px, int *py)
{
MpegEncContext *const s = &w->s;
MpegEncContext *const s = &w->ms.m;
int xy, wrap, diff, type;
int16_t *A, *B, *C, *mot_val;
@ -405,7 +405,7 @@ static int16_t *wmv2_pred_motion(WMV2DecContext *w, int *px, int *py)
static inline int wmv2_decode_inter_block(WMV2DecContext *w, int16_t *block,
int n, int cbp)
{
MpegEncContext *const s = &w->s;
MpegEncContext *const s = &w->ms.m;
static const int sub_cbp_table[3] = { 2, 3, 1 };
int sub_cbp, ret;
@ -561,7 +561,7 @@ static int wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
static av_cold int wmv2_decode_init(AVCodecContext *avctx)
{
WMV2DecContext *const w = avctx->priv_data;
MpegEncContext *const s = &w->s;
MpegEncContext *const s = &w->ms.m;
int ret;
s->private_ctx = &w->common;
@ -575,8 +575,8 @@ static av_cold int wmv2_decode_init(AVCodecContext *avctx)
decode_ext_header(w);
return ff_intrax8_common_init(avctx, &w->x8, w->s.block,
w->s.mb_width, w->s.mb_height);
return ff_intrax8_common_init(avctx, &w->x8, s->block,
s->mb_width, s->mb_height);
}
static av_cold int wmv2_decode_end(AVCodecContext *avctx)