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avcodec/h261: Separate decode and encode contexts 

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-01-27 22:49:52 +01:00
parent 725e2300af
commit d5e87df902
4 changed files with 72 additions and 51 deletions
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2
libavcodec/h261.c
View File

@ -60,7 +60,7 @@ static void h261_loop_filter(uint8_t *src, int stride)
void ff_h261_loop_filter(MpegEncContext *s)
{
H261Context *h = (H261Context *)s;
H261Context *const h = s->private_ctx;
const int linesize = s->linesize;
const int uvlinesize = s->uvlinesize;
uint8_t *dest_y = s->dest[0];

8
libavcodec/h261.h
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@ -35,15 +35,7 @@
* H261Context
*/
typedef struct H261Context {
MpegEncContext s;
int current_mba;
int mba_diff;
int mtype;
int current_mv_x;
int current_mv_y;
int gob_number;
int gob_start_code_skipped; // 1 if gob start code is already read before gob header is read
} H261Context;
#define MB_TYPE_H261_FIL 0x800000

59
libavcodec/h261dec.c
View File

@ -47,6 +47,19 @@ static VLC h261_mtype_vlc;
static VLC h261_mv_vlc;
static VLC h261_cbp_vlc;
typedef struct H261DecContext {
MpegEncContext s;
H261Context common;
int current_mba;
int mba_diff;
int current_mv_x;
int current_mv_y;
int gob_number;
int gob_start_code_skipped; // 1 if gob start code is already read before gob header is read
} H261DecContext;
static av_cold void h261_decode_init_static(void)
{
INIT_VLC_STATIC(&h261_mba_vlc, H261_MBA_VLC_BITS, 35,
@ -67,9 +80,10 @@ static av_cold void h261_decode_init_static(void)
static av_cold int h261_decode_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
H261Context *h = avctx->priv_data;
H261DecContext *const h = avctx->priv_data;
MpegEncContext *const s = &h->s;
s->private_ctx = &h->common;
// set defaults
ff_mpv_decode_init(s, avctx);
@ -89,7 +103,7 @@ static av_cold int h261_decode_init(AVCodecContext *avctx)
* Decode the group of blocks header or slice header.
* @return <0 if an error occurred
*/
static int h261_decode_gob_header(H261Context *h)
static int h261_decode_gob_header(H261DecContext *h)
{
unsigned int val;
MpegEncContext *const s = &h->s;
@ -143,7 +157,7 @@ static int h261_decode_gob_header(H261Context *h)
* Decode the group of blocks / video packet header.
* @return <0 if no resync found
*/
static int h261_resync(H261Context *h)
static int h261_resync(H261DecContext *h)
{
MpegEncContext *const s = &h->s;
int left, ret;
@ -184,7 +198,7 @@ static int h261_resync(H261Context *h)
* Decode skipped macroblocks.
* @return 0
*/
static int h261_decode_mb_skipped(H261Context *h, int mba1, int mba2)
static int h261_decode_mb_skipped(H261DecContext *h, int mba1, int mba2)
{
MpegEncContext *const s = &h->s;
int i;
@ -209,7 +223,7 @@ static int h261_decode_mb_skipped(H261Context *h, int mba1, int mba2)
s->mv[0][0][0] = 0;
s->mv[0][0][1] = 0;
s->mb_skipped = 1;
h->mtype &= ~MB_TYPE_H261_FIL;
h->common.mtype &= ~MB_TYPE_H261_FIL;
if (s->current_picture.motion_val[0]) {
int b_stride = 2*s->mb_width + 1;
@ -254,7 +268,7 @@ static int decode_mv_component(GetBitContext *gb, int v)
* Decode a macroblock.
* @return <0 if an error occurred
*/
static int h261_decode_block(H261Context *h, int16_t *block, int n, int coded)
static int h261_decode_block(H261DecContext *h, int16_t *block, int n, int coded)
{
MpegEncContext *const s = &h->s;
int level, i, j, run;
@ -346,9 +360,10 @@ static int h261_decode_block(H261Context *h, int16_t *block, int n, int coded)
return 0;
}
static int h261_decode_mb(H261Context *h)
static int h261_decode_mb(H261DecContext *h)
{
MpegEncContext *const s = &h->s;
H261Context *const com = &h->common;
int i, cbp, xy;
cbp = 63;
@ -386,23 +401,23 @@ static int h261_decode_mb(H261Context *h)
ff_update_block_index(s);
// Read mtype
h->mtype = get_vlc2(&s->gb, h261_mtype_vlc.table, H261_MTYPE_VLC_BITS, 2);
if (h->mtype < 0) {
com->mtype = get_vlc2(&s->gb, h261_mtype_vlc.table, H261_MTYPE_VLC_BITS, 2);
if (com->mtype < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid mtype index %d\n",
h->mtype);
com->mtype);
return SLICE_ERROR;
}
av_assert0(h->mtype < FF_ARRAY_ELEMS(ff_h261_mtype_map));
h->mtype = ff_h261_mtype_map[h->mtype];
av_assert0(com->mtype < FF_ARRAY_ELEMS(ff_h261_mtype_map));
com->mtype = ff_h261_mtype_map[com->mtype];
// Read mquant
if (IS_QUANT(h->mtype))
if (IS_QUANT(com->mtype))
ff_set_qscale(s, get_bits(&s->gb, 5));
s->mb_intra = IS_INTRA4x4(h->mtype);
s->mb_intra = IS_INTRA4x4(com->mtype);
// Read mv
if (IS_16X16(h->mtype)) {
if (IS_16X16(com->mtype)) {
/* Motion vector data is included for all MC macroblocks. MVD is
* obtained from the macroblock vector by subtracting the vector
* of the preceding macroblock. For this calculation the vector
@ -425,7 +440,7 @@ static int h261_decode_mb(H261Context *h)
}
// Read cbp
if (HAS_CBP(h->mtype))
if (HAS_CBP(com->mtype))
cbp = get_vlc2(&s->gb, h261_cbp_vlc.table, H261_CBP_VLC_BITS, 1) + 1;
if (s->mb_intra) {
@ -449,7 +464,7 @@ static int h261_decode_mb(H261Context *h)
intra:
/* decode each block */
if (s->mb_intra || HAS_CBP(h->mtype)) {
if (s->mb_intra || HAS_CBP(com->mtype)) {
s->bdsp.clear_blocks(s->block[0]);
for (i = 0; i < 6; i++) {
if (h261_decode_block(h, s->block[i], i, cbp & 32) < 0)
@ -470,7 +485,7 @@ intra:
* Decode the H.261 picture header.
* @return <0 if no startcode found
*/
static int h261_decode_picture_header(H261Context *h)
static int h261_decode_picture_header(H261DecContext *h)
{
MpegEncContext *const s = &h->s;
int format, i;
@ -534,7 +549,7 @@ static int h261_decode_picture_header(H261Context *h)
return 0;
}
static int h261_decode_gob(H261Context *h)
static int h261_decode_gob(H261DecContext *h)
{
MpegEncContext *const s = &h->s;
@ -580,9 +595,9 @@ static int get_consumed_bytes(MpegEncContext *s, int buf_size)
static int h261_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
H261DecContext *const h = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
H261Context *h = avctx->priv_data;
MpegEncContext *s = &h->s;
int ret;
AVFrame *pict = data;
@ -657,7 +672,7 @@ retry:
static av_cold int h261_decode_end(AVCodecContext *avctx)
{
H261Context *h = avctx->priv_data;
H261DecContext *const h = avctx->priv_data;
MpegEncContext *s = &h->s;
ff_mpv_common_end(s);
@ -669,7 +684,7 @@ const AVCodec ff_h261_decoder = {
.long_name = NULL_IF_CONFIG_SMALL("H.261"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H261,
.priv_data_size = sizeof(H261Context),
.priv_data_size = sizeof(H261DecContext),
.init = h261_decode_init,
.close = h261_decode_end,
.decode = h261_decode_frame,

54
libavcodec/h261enc.c
View File

@ -37,6 +37,14 @@
static uint8_t uni_h261_rl_len [64*64*2*2];
#define UNI_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
typedef struct H261EncContext {
MpegEncContext s;
H261Context common;
int gob_number;
} H261EncContext;
int ff_h261_get_picture_format(int width, int height)
{
// QCIF
@ -52,7 +60,7 @@ int ff_h261_get_picture_format(int width, int height)
void ff_h261_encode_picture_header(MpegEncContext *s, int picture_number)
{
H261Context *h = (H261Context *)s;
H261EncContext *const h = (H261EncContext *)s;
int format, temp_ref;
align_put_bits(&s->pb);
@ -90,7 +98,7 @@ void ff_h261_encode_picture_header(MpegEncContext *s, int picture_number)
*/
static void h261_encode_gob_header(MpegEncContext *s, int mb_line)
{
H261Context *h = (H261Context *)s;
H261EncContext *const h = (H261EncContext *)s;
if (ff_h261_get_picture_format(s->width, s->height) == 0) {
h->gob_number += 2; // QCIF
} else {
@ -132,7 +140,7 @@ void ff_h261_reorder_mb_index(MpegEncContext *s)
}
}
static void h261_encode_motion(H261Context *h, int val)
static void h261_encode_motion(H261EncContext *h, int val)
{
MpegEncContext *const s = &h->s;
int sign, code;
@ -166,7 +174,7 @@ static inline int get_cbp(MpegEncContext *s, int16_t block[6][64])
* @param block the 8x8 block
* @param n block index (0-3 are luma, 4-5 are chroma)
*/
static void h261_encode_block(H261Context *h, int16_t *block, int n)
static void h261_encode_block(H261EncContext *h, int16_t *block, int n)
{
MpegEncContext *const s = &h->s;
int level, run, i, j, last_index, last_non_zero, sign, slevel, code;
@ -237,12 +245,15 @@ static void h261_encode_block(H261Context *h, int16_t *block, int n)
void ff_h261_encode_mb(MpegEncContext *s, int16_t block[6][64],
int motion_x, int motion_y)
{
H261Context *h = (H261Context *)s;
/* The following is only allowed because this encoder
* does not use slice threading. */
H261EncContext *const h = (H261EncContext *)s;
H261Context *const com = &h->common;
int mvd, mv_diff_x, mv_diff_y, i, cbp;
cbp = 63; // avoid warning
mvd = 0;
h->mtype = 0;
com->mtype = 0;
if (!s->mb_intra) {
/* compute cbp */
@ -270,34 +281,34 @@ void ff_h261_encode_mb(MpegEncContext *s, int16_t block[6][64],
/* calculate MTYPE */
if (!s->mb_intra) {
h->mtype++;
com->mtype++;
if (mvd || s->loop_filter)
h->mtype += 3;
com->mtype += 3;
if (s->loop_filter)
h->mtype += 3;
com->mtype += 3;
if (cbp)
h->mtype++;
av_assert1(h->mtype > 1);
com->mtype++;
av_assert1(com->mtype > 1);
}
if (s->dquant && cbp) {
h->mtype++;
com->mtype++;
} else
s->qscale -= s->dquant;
put_bits(&s->pb,
ff_h261_mtype_bits[h->mtype],
ff_h261_mtype_code[h->mtype]);
ff_h261_mtype_bits[com->mtype],
ff_h261_mtype_code[com->mtype]);
h->mtype = ff_h261_mtype_map[h->mtype];
com->mtype = ff_h261_mtype_map[com->mtype];
if (IS_QUANT(h->mtype)) {
if (IS_QUANT(com->mtype)) {
ff_set_qscale(s, s->qscale + s->dquant);
put_bits(&s->pb, 5, s->qscale);
}
if (IS_16X16(h->mtype)) {
if (IS_16X16(com->mtype)) {
mv_diff_x = (motion_x >> 1) - s->last_mv[0][0][0];
mv_diff_y = (motion_y >> 1) - s->last_mv[0][0][1];
s->last_mv[0][0][0] = (motion_x >> 1);
@ -306,7 +317,7 @@ void ff_h261_encode_mb(MpegEncContext *s, int16_t block[6][64],
h261_encode_motion(h, mv_diff_y);
}
if (HAS_CBP(h->mtype)) {
if (HAS_CBP(com->mtype)) {
av_assert1(cbp > 0);
put_bits(&s->pb,
ff_h261_cbp_tab[cbp - 1][1],
@ -316,7 +327,7 @@ void ff_h261_encode_mb(MpegEncContext *s, int16_t block[6][64],
/* encode each block */
h261_encode_block(h, block[i], i);
if (!IS_16X16(h->mtype)) {
if (!IS_16X16(com->mtype)) {
s->last_mv[0][0][0] = 0;
s->last_mv[0][0][1] = 0;
}
@ -371,8 +382,11 @@ static av_cold void h261_encode_init_static(void)
av_cold void ff_h261_encode_init(MpegEncContext *s)
{
H261EncContext *const h = (H261EncContext*)s;
static AVOnce init_static_once = AV_ONCE_INIT;
s->private_ctx = &h->common;
s->min_qcoeff = -127;
s->max_qcoeff = 127;
s->y_dc_scale_table =
@ -390,7 +404,7 @@ const AVCodec ff_h261_encoder = {
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H261,
.priv_class = &ff_mpv_enc_class,
.priv_data_size = sizeof(H261Context),
.priv_data_size = sizeof(H261EncContext),
.init = ff_mpv_encode_init,
.encode2 = ff_mpv_encode_picture,
.close = ff_mpv_encode_end,