diff options
Diffstat (limited to 'libavcodec/h261enc.c')
| -rw-r--r-- | libavcodec/h261enc.c | 216 |
1 files changed, 112 insertions, 104 deletions
diff --git a/libavcodec/h261enc.c b/libavcodec/h261enc.c index cd84212..386e200 100644 --- a/libavcodec/h261enc.c +++ b/libavcodec/h261enc.c @@ -32,10 +32,11 @@ #include "h261.h" #include "h261data.h" -static void h261_encode_block(H261Context * h, int16_t * block, +static void h261_encode_block(H261Context *h, int16_t *block, int n); -int ff_h261_get_picture_format(int width, int height){ +int ff_h261_get_picture_format(int width, int height) +{ // QCIF if (width == 176 && height == 144) return 0; @@ -47,8 +48,9 @@ int ff_h261_get_picture_format(int width, int height){ return -1; } -void ff_h261_encode_picture_header(MpegEncContext * s, int picture_number){ - H261Context * h = (H261Context *) s; +void ff_h261_encode_picture_header(MpegEncContext *s, int picture_number) +{ + H261Context *h = (H261Context *)s; int format, temp_ref; avpriv_align_put_bits(&s->pb); @@ -58,8 +60,8 @@ void ff_h261_encode_picture_header(MpegEncContext * s, int picture_number){ put_bits(&s->pb, 20, 0x10); /* PSC */ - temp_ref= s->picture_number * (int64_t)30000 * s->avctx->time_base.num / - (1001 * (int64_t)s->avctx->time_base.den); //FIXME maybe this should use a timestamp + temp_ref = s->picture_number * (int64_t)30000 * s->avctx->time_base.num / + (1001 * (int64_t)s->avctx->time_base.den); // FIXME maybe this should use a timestamp put_sbits(&s->pb, 5, temp_ref); /* TemporalReference */ put_bits(&s->pb, 1, 0); /* split screen off */ @@ -74,7 +76,7 @@ void ff_h261_encode_picture_header(MpegEncContext * s, int picture_number){ put_bits(&s->pb, 1, 0); /* reserved */ put_bits(&s->pb, 1, 0); /* no PEI */ - if(format == 0) + if (format == 0) h->gob_number = -1; else h->gob_number = 0; @@ -84,78 +86,80 @@ void ff_h261_encode_picture_header(MpegEncContext * s, int picture_number){ /** * Encode a group of blocks header. */ -static void h261_encode_gob_header(MpegEncContext * s, int mb_line){ - H261Context * h = (H261Context *)s; - if(ff_h261_get_picture_format(s->width, s->height) == 0){ - h->gob_number+=2; // QCIF - } - else{ - h->gob_number++; // CIF +static void h261_encode_gob_header(MpegEncContext *s, int mb_line) +{ + H261Context *h = (H261Context *)s; + if (ff_h261_get_picture_format(s->width, s->height) == 0) { + h->gob_number += 2; // QCIF + } else { + h->gob_number++; // CIF } - put_bits(&s->pb, 16, 1); /* GBSC */ + put_bits(&s->pb, 16, 1); /* GBSC */ put_bits(&s->pb, 4, h->gob_number); /* GN */ - put_bits(&s->pb, 5, s->qscale); /* GQUANT */ - put_bits(&s->pb, 1, 0); /* no GEI */ - h->current_mba = 0; + put_bits(&s->pb, 5, s->qscale); /* GQUANT */ + put_bits(&s->pb, 1, 0); /* no GEI */ + h->current_mba = 0; h->previous_mba = 0; - h->current_mv_x=0; - h->current_mv_y=0; + h->current_mv_x = 0; + h->current_mv_y = 0; } -void ff_h261_reorder_mb_index(MpegEncContext* s){ - int index= s->mb_x + s->mb_y*s->mb_width; +void ff_h261_reorder_mb_index(MpegEncContext *s) +{ + int index = s->mb_x + s->mb_y * s->mb_width; - if(index % 33 == 0) - h261_encode_gob_header(s,0); + if (index % 33 == 0) + h261_encode_gob_header(s, 0); /* for CIF the GOB's are fragmented in the middle of a scanline - that's why we need to adjust the x and y index of the macroblocks */ - if(ff_h261_get_picture_format(s->width,s->height) == 1){ // CIF - s->mb_x = index % 11 ; index /= 11; - s->mb_y = index % 3 ; index /= 3; - s->mb_x+= 11*(index % 2); index /= 2; - s->mb_y+= 3*index; + * that's why we need to adjust the x and y index of the macroblocks */ + if (ff_h261_get_picture_format(s->width, s->height) == 1) { // CIF + s->mb_x = index % 11; + index /= 11; + s->mb_y = index % 3; + index /= 3; + s->mb_x += 11 * (index % 2); + index /= 2; + s->mb_y += 3 * index; ff_init_block_index(s); ff_update_block_index(s); } } -static void h261_encode_motion(H261Context * h, int val){ - MpegEncContext * const s = &h->s; +static void h261_encode_motion(H261Context *h, int val) +{ + MpegEncContext *const s = &h->s; int sign, code; - if(val==0){ + if (val == 0) { code = 0; - put_bits(&s->pb,ff_h261_mv_tab[code][1],ff_h261_mv_tab[code][0]); - } - else{ - if(val > 15) - val -=32; - if(val < -16) - val+=32; + put_bits(&s->pb, ff_h261_mv_tab[code][1], ff_h261_mv_tab[code][0]); + } else { + if (val > 15) + val -= 32; + if (val < -16) + val += 32; sign = val < 0; code = sign ? -val : val; - put_bits(&s->pb,ff_h261_mv_tab[code][1],ff_h261_mv_tab[code][0]); - put_bits(&s->pb,1,sign); + put_bits(&s->pb, ff_h261_mv_tab[code][1], ff_h261_mv_tab[code][0]); + put_bits(&s->pb, 1, sign); } } -static inline int get_cbp(MpegEncContext * s, - int16_t block[6][64]) +static inline int get_cbp(MpegEncContext *s, int16_t block[6][64]) { int i, cbp; - cbp= 0; - for (i = 0; i < 6; i++) { + cbp = 0; + for (i = 0; i < 6; i++) if (s->block_last_index[i] >= 0) cbp |= 1 << (5 - i); - } return cbp; } -void ff_h261_encode_mb(MpegEncContext * s, - int16_t block[6][64], - int motion_x, int motion_y) + +void ff_h261_encode_mb(MpegEncContext *s, int16_t block[6][64], + int motion_x, int motion_y) { - H261Context * h = (H261Context *)s; + H261Context *h = (H261Context *)s; int mvd, mv_diff_x, mv_diff_y, i, cbp; cbp = 63; // avoid warning mvd = 0; @@ -163,77 +167,79 @@ void ff_h261_encode_mb(MpegEncContext * s, h->current_mba++; h->mtype = 0; - if (!s->mb_intra){ + if (!s->mb_intra) { /* compute cbp */ - cbp= get_cbp(s, block); + cbp = get_cbp(s, block); /* mvd indicates if this block is motion compensated */ mvd = motion_x | motion_y; - if((cbp | mvd | s->dquant ) == 0) { + if ((cbp | mvd | s->dquant) == 0) { /* skip macroblock */ s->skip_count++; - h->current_mv_x=0; - h->current_mv_y=0; + h->current_mv_x = 0; + h->current_mv_y = 0; return; } } /* MB is not skipped, encode MBA */ - 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]); + 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->mb_intra) { h->mtype++; - if(mvd || s->loop_filter) - h->mtype+=3; - if(s->loop_filter) - h->mtype+=3; - if(cbp || s->dquant) + if (mvd || s->loop_filter) + h->mtype += 3; + if (s->loop_filter) + h->mtype += 3; + if (cbp || s->dquant) h->mtype++; av_assert1(h->mtype > 1); } - if(s->dquant) + if (s->dquant) h->mtype++; put_bits(&s->pb, ff_h261_mtype_bits[h->mtype], ff_h261_mtype_code[h->mtype]); h->mtype = ff_h261_mtype_map[h->mtype]; - if(IS_QUANT(h->mtype)){ - ff_set_qscale(s,s->qscale+s->dquant); + if (IS_QUANT(h->mtype)) { + ff_set_qscale(s, s->qscale + s->dquant); put_bits(&s->pb, 5, s->qscale); } - if(IS_16X16(h->mtype)){ - mv_diff_x = (motion_x >> 1) - h->current_mv_x; - mv_diff_y = (motion_y >> 1) - h->current_mv_y; + if (IS_16X16(h->mtype)) { + mv_diff_x = (motion_x >> 1) - h->current_mv_x; + mv_diff_y = (motion_y >> 1) - h->current_mv_y; h->current_mv_x = (motion_x >> 1); h->current_mv_y = (motion_y >> 1); - h261_encode_motion(h,mv_diff_x); - h261_encode_motion(h,mv_diff_y); + h261_encode_motion(h, mv_diff_x); + h261_encode_motion(h, mv_diff_y); } h->previous_mba = h->current_mba; - if(HAS_CBP(h->mtype)){ - av_assert1(cbp>0); - put_bits(&s->pb,ff_h261_cbp_tab[cbp-1][1],ff_h261_cbp_tab[cbp-1][0]); + if (HAS_CBP(h->mtype)) { + av_assert1(cbp > 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++) { + for (i = 0; i < 6; i++) /* encode each block */ h261_encode_block(h, block[i], i); - } - if ( ( h->current_mba == 11 ) || ( h->current_mba == 22 ) || ( h->current_mba == 33 ) || ( !IS_16X16 ( h->mtype ) )){ - h->current_mv_x=0; - h->current_mv_y=0; + if ((h->current_mba == 11) || (h->current_mba == 22) || + (h->current_mba == 33) || (!IS_16X16(h->mtype))) { + h->current_mv_x = 0; + h->current_mv_y = 0; } } -void ff_h261_encode_init(MpegEncContext *s){ +void ff_h261_encode_init(MpegEncContext *s) +{ static int done = 0; if (!done) { @@ -241,20 +247,20 @@ void ff_h261_encode_init(MpegEncContext *s){ ff_init_rl(&ff_h261_rl_tcoeff, ff_h261_rl_table_store); } - s->min_qcoeff= -127; - s->max_qcoeff= 127; - s->y_dc_scale_table= - s->c_dc_scale_table= ff_mpeg1_dc_scale_table; + s->min_qcoeff = -127; + s->max_qcoeff = 127; + s->y_dc_scale_table = + 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; +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; @@ -264,12 +270,12 @@ static void h261_encode_block(H261Context * h, int16_t * block, int n){ level = block[0]; /* 255 cannot be represented, so we clamp */ if (level > 254) { - level = 254; + level = 254; block[0] = 254; } /* 0 cannot be represented also */ else if (level < 1) { - level = 1; + level = 1; block[0] = 1; } if (level == 128) @@ -277,31 +283,33 @@ static void h261_encode_block(H261Context * h, int16_t * block, int n){ 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 ); + } 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_index = s->block_last_index[n]; last_non_zero = i - 1; for (; i <= last_index; i++) { - j = s->intra_scantable.permutated[i]; + j = s->intra_scantable.permutated[i]; level = block[j]; if (level) { - run = i - last_non_zero - 1; - sign = 0; + run = i - last_non_zero - 1; + sign = 0; slevel = level; if (level < 0) { - sign = 1; + 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; + 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); @@ -314,9 +322,8 @@ static void h261_encode_block(H261Context * h, int16_t * block, int n){ last_non_zero = i; } } - if(last_index > -1){ - put_bits(&s->pb, rl->table_vlc[0][1], rl->table_vlc[0][0]);// END OF BLOCK - } + if (last_index > -1) + put_bits(&s->pb, rl->table_vlc[0][1], rl->table_vlc[0][0]); // EOB } FF_MPV_GENERIC_CLASS(h261) @@ -329,7 +336,8 @@ AVCodec ff_h261_encoder = { .init = ff_MPV_encode_init, .encode2 = ff_MPV_encode_picture, .close = ff_MPV_encode_end, - .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE }, + .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, }; |
