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Code Issues Releases Activity

avcodec/svq1enc: Move PutBitContext from context to stack

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This is more natural, because said context is only used
for the duration of one call to svq1_encode_frame().

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2022-10-11 00:14:02 +02:00
parent d08b2900a9
commit a010193fcb
1 changed files with 22 additions and 22 deletions
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44
libavcodec/svq1enc.c
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@@ -56,7 +56,6 @@ typedef struct SVQ1EncContext {
HpelDSPContext hdsp;
AVFrame *current_picture;
AVFrame *last_picture;
PutBitContext pb;
/* Some compression statistics */
enum AVPictureType pict_type;
@@ -93,38 +92,38 @@ typedef struct SVQ1EncContext {
SVQ1EncDSPContext svq1encdsp;
} SVQ1EncContext;
static void svq1_write_header(SVQ1EncContext *s, int frame_type)
static void svq1_write_header(SVQ1EncContext *s, PutBitContext *pb, int frame_type)
{
int i;
/* frame code */
put_bits(&s->pb, 22, 0x20);
put_bits(pb, 22, 0x20);
/* temporal reference (sure hope this is a "don't care") */
put_bits(&s->pb, 8, 0x00);
put_bits(pb, 8, 0x00);
/* frame type */
put_bits(&s->pb, 2, frame_type - 1);
put_bits(pb, 2, frame_type - 1);
if (frame_type == AV_PICTURE_TYPE_I) {
/* no checksum since frame code is 0x20 */
/* no embedded string either */
/* output 5 unknown bits (2 + 2 + 1) */
put_bits(&s->pb, 5, 2); /* 2 needed by quicktime decoder */
put_bits(pb, 5, 2); /* 2 needed by quicktime decoder */
i = ff_match_2uint16((void*)ff_svq1_frame_size_table,
FF_ARRAY_ELEMS(ff_svq1_frame_size_table),
s->frame_width, s->frame_height);
put_bits(&s->pb, 3, i);
put_bits(pb, 3, i);
if (i == 7) {
put_bits(&s->pb, 12, s->frame_width);
put_bits(&s->pb, 12, s->frame_height);
put_bits(pb, 12, s->frame_width);
put_bits(pb, 12, s->frame_height);
}
}
/* no checksum or extra data (next 2 bits get 0) */
put_bits(&s->pb, 2, 0);
put_bits(pb, 2, 0);
}
#define QUALITY_THRESHOLD 100
@@ -298,6 +297,7 @@ static void init_block_index(MpegEncContext *s){
}
static int svq1_encode_plane(SVQ1EncContext *s, int plane,
PutBitContext *pb,
const unsigned char *src_plane,
unsigned char *ref_plane,
unsigned char *decoded_plane,
@@ -425,7 +425,7 @@ static int svq1_encode_plane(SVQ1EncContext *s, int plane,
int score[4] = { 0, 0, 0, 0 }, best;
uint8_t *temp = s->scratchbuf;
if (put_bytes_left(&s->pb, 0) < 3000) { // FIXME: check size
if (put_bytes_left(pb, 0) < 3000) { // FIXME: check size
av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
return -1;
}
@@ -496,7 +496,7 @@ static int svq1_encode_plane(SVQ1EncContext *s, int plane,
if (score[2] < score[best] && mx == 0 && my == 0) {
best = 2;
s->hdsp.put_pixels_tab[0][0](decoded, ref, stride, 16);
put_bits(&s->pb, SVQ1_BLOCK_SKIP_LEN, SVQ1_BLOCK_SKIP_CODE);
put_bits(pb, SVQ1_BLOCK_SKIP_LEN, SVQ1_BLOCK_SKIP_CODE);
}
}
@@ -521,7 +521,7 @@ static int svq1_encode_plane(SVQ1EncContext *s, int plane,
if (best != 2)
for (i = 5; i >= 0; i--)
ff_copy_bits(&s->pb, reorder_buffer[best][i],
ff_copy_bits(pb, reorder_buffer[best][i],
count[best][i]);
if (best == 0)
s->hdsp.put_pixels_tab[0][0](decoded, temp, stride, 16);
@@ -630,6 +630,7 @@ static int svq1_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{
SVQ1EncContext *const s = avctx->priv_data;
PutBitContext pb;
int i, ret;
ret = ff_alloc_packet(avctx, pkt, s->y_block_width * s->y_block_height *
@@ -660,8 +661,6 @@ static int svq1_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
FFSWAP(AVFrame*, s->current_picture, s->last_picture);
init_put_bits(&s->pb, pkt->data, pkt->size);
if (avctx->gop_size && (avctx->frame_number % avctx->gop_size))
s->pict_type = AV_PICTURE_TYPE_P;
else
@@ -670,9 +669,10 @@ static int svq1_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
ff_side_data_set_encoder_stats(pkt, pict->quality, NULL, 0, s->pict_type);
svq1_write_header(s, s->pict_type);
init_put_bits(&pb, pkt->data, pkt->size);
svq1_write_header(s, &pb, s->pict_type);
for (i = 0; i < 3; i++) {
int ret = svq1_encode_plane(s, i,
int ret = svq1_encode_plane(s, i, &pb,
pict->data[i],
s->last_picture->data[i],
s->current_picture->data[i],
@@ -692,13 +692,13 @@ static int svq1_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
}
}
// align_put_bits(&s->pb);
while (put_bits_count(&s->pb) & 31)
put_bits(&s->pb, 1, 0);
// align_put_bits(&pb);
while (put_bits_count(&pb) & 31)
put_bits(&pb, 1, 0);
flush_put_bits(&s->pb);
flush_put_bits(&pb);
pkt->size = put_bytes_output(&s->pb);
pkt->size = put_bytes_output(&pb);
if (s->pict_type == AV_PICTURE_TYPE_I)
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;