* H.261 encoder.
*/
+#include "libavutil/attributes.h"
#include "avcodec.h"
+#include "mpegutils.h"
#include "mpegvideo.h"
#include "h263.h"
#include "h261.h"
-#include "h261data.h"
-
-static void h261_encode_block(H261Context *h, int16_t *block,
- int n);
int ff_h261_get_picture_format(int width, int height)
{
int sign, code;
if (val == 0) {
code = 0;
- put_bits(&s->pb, h261_mv_tab[code][1], h261_mv_tab[code][0]);
+ put_bits(&s->pb, ff_h261_mv_tab[code][1], ff_h261_mv_tab[code][0]);
} else {
if (val > 15)
val -= 32;
val += 32;
sign = val < 0;
code = sign ? -val : val;
- put_bits(&s->pb, h261_mv_tab[code][1], h261_mv_tab[code][0]);
+ put_bits(&s->pb, ff_h261_mv_tab[code][1], ff_h261_mv_tab[code][0]);
put_bits(&s->pb, 1, sign);
}
}
return cbp;
}
+/**
+ * Encode an 8x8 block.
+ * @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)
+{
+ MpegEncContext *const s = &h->s;
+ int level, run, i, j, last_index, last_non_zero, sign, slevel, code;
+ RLTable *rl;
+
+ rl = &ff_h261_rl_tcoeff;
+ if (s->mb_intra) {
+ /* DC coef */
+ level = block[0];
+ /* 255 cannot be represented, so we clamp */
+ if (level > 254) {
+ level = 254;
+ block[0] = 254;
+ }
+ /* 0 cannot be represented also */
+ else if (level < 1) {
+ level = 1;
+ block[0] = 1;
+ }
+ if (level == 128)
+ put_bits(&s->pb, 8, 0xff);
+ else
+ put_bits(&s->pb, 8, level);
+ i = 1;
+ } else if ((block[0] == 1 || block[0] == -1) &&
+ (s->block_last_index[n] > -1)) {
+ // special case
+ put_bits(&s->pb, 2, block[0] > 0 ? 2 : 3);
+ i = 1;
+ } else {
+ i = 0;
+ }
+
+ /* AC coefs */
+ last_index = s->block_last_index[n];
+ last_non_zero = i - 1;
+ for (; i <= last_index; i++) {
+ j = s->intra_scantable.permutated[i];
+ level = block[j];
+ if (level) {
+ run = i - last_non_zero - 1;
+ sign = 0;
+ slevel = level;
+ if (level < 0) {
+ sign = 1;
+ level = -level;
+ }
+ code = get_rl_index(rl, 0 /*no last in H.261, EOB is used*/,
+ run, level);
+ if (run == 0 && level < 16)
+ code += 1;
+ put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
+ if (code == rl->n) {
+ put_bits(&s->pb, 6, run);
+ assert(slevel != 0);
+ assert(level <= 127);
+ put_sbits(&s->pb, 8, slevel);
+ } else {
+ put_bits(&s->pb, 1, sign);
+ }
+ last_non_zero = i;
+ }
+ }
+ if (last_index > -1)
+ put_bits(&s->pb, rl->table_vlc[0][1], rl->table_vlc[0][0]); // EOB
+}
+
void ff_h261_encode_mb(MpegEncContext *s, int16_t block[6][64],
int motion_x, int motion_y)
{
}
/* MB is not skipped, encode MBA */
- put_bits(&s->pb, h261_mba_bits[(h->current_mba - h->previous_mba) - 1],
- h261_mba_code[(h->current_mba - h->previous_mba) - 1]);
+ put_bits(&s->pb,
+ ff_h261_mba_bits[(h->current_mba - h->previous_mba) - 1],
+ ff_h261_mba_code[(h->current_mba - h->previous_mba) - 1]);
/* calculate MTYPE */
if (!s->mb_intra) {
if (s->dquant)
h->mtype++;
- put_bits(&s->pb, h261_mtype_bits[h->mtype], h261_mtype_code[h->mtype]);
+ put_bits(&s->pb,
+ ff_h261_mtype_bits[h->mtype],
+ ff_h261_mtype_code[h->mtype]);
- h->mtype = h261_mtype_map[h->mtype];
+ h->mtype = ff_h261_mtype_map[h->mtype];
if (IS_QUANT(h->mtype)) {
ff_set_qscale(s, s->qscale + s->dquant);
if (HAS_CBP(h->mtype)) {
assert(cbp > 0);
- put_bits(&s->pb, h261_cbp_tab[cbp - 1][1], h261_cbp_tab[cbp - 1][0]);
+ put_bits(&s->pb,
+ ff_h261_cbp_tab[cbp - 1][1],
+ ff_h261_cbp_tab[cbp - 1][0]);
}
for (i = 0; i < 6; i++)
/* encode each block */
}
}
-void ff_h261_encode_init(MpegEncContext *s)
+av_cold void ff_h261_encode_init(MpegEncContext *s)
{
- static int done = 0;
-
- if (!done) {
- done = 1;
- ff_init_rl(&h261_rl_tcoeff, ff_h261_rl_table_store);
- }
+ ff_h261_common_init();
s->min_qcoeff = -127;
s->max_qcoeff = 127;
s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
}
-/**
- * Encode an 8x8 block.
- * @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)
-{
- MpegEncContext *const s = &h->s;
- int level, run, i, j, last_index, last_non_zero, sign, slevel, code;
- RLTable *rl;
-
- rl = &h261_rl_tcoeff;
- if (s->mb_intra) {
- /* DC coef */
- level = block[0];
- /* 255 cannot be represented, so we clamp */
- if (level > 254) {
- level = 254;
- block[0] = 254;
- }
- /* 0 cannot be represented also */
- else if (level < 1) {
- level = 1;
- block[0] = 1;
- }
- if (level == 128)
- put_bits(&s->pb, 8, 0xff);
- else
- put_bits(&s->pb, 8, level);
- i = 1;
- } else if ((block[0] == 1 || block[0] == -1) &&
- (s->block_last_index[n] > -1)) {
- // special case
- put_bits(&s->pb, 2, block[0] > 0 ? 2 : 3);
- i = 1;
- } else {
- i = 0;
- }
-
- /* AC coefs */
- last_index = s->block_last_index[n];
- last_non_zero = i - 1;
- for (; i <= last_index; i++) {
- j = s->intra_scantable.permutated[i];
- level = block[j];
- if (level) {
- run = i - last_non_zero - 1;
- sign = 0;
- slevel = level;
- if (level < 0) {
- sign = 1;
- level = -level;
- }
- code = get_rl_index(rl, 0 /*no last in H.261, EOB is used*/,
- run, level);
- if (run == 0 && level < 16)
- code += 1;
- put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
- if (code == rl->n) {
- put_bits(&s->pb, 6, run);
- assert(slevel != 0);
- assert(level <= 127);
- put_sbits(&s->pb, 8, slevel);
- } else {
- put_bits(&s->pb, 1, sign);
- }
- last_non_zero = i;
- }
- }
- if (last_index > -1)
- put_bits(&s->pb, rl->table_vlc[0][1], rl->table_vlc[0][0]); // EOB
-}
-
FF_MPV_GENERIC_CLASS(h261)
AVCodec ff_h261_encoder = {
.name = "h261",
+ .long_name = NULL_IF_CONFIG_SMALL("H.261"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H261,
.priv_data_size = sizeof(H261Context),
.close = ff_MPV_encode_end,
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE },
- .long_name = NULL_IF_CONFIG_SMALL("H.261"),
.priv_class = &h261_class,
};
projects / ffmpeg / blobdiff