[libav.git] / libavcodec / h261enc.c

/*
 * H261 encoder
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
 * Copyright (c) 2004 Maarten Daniels
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * H.261 encoder.
 */

#include "avcodec.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){
    // QCIF
    if (width == 176 && height == 144)
        return 0;
    // CIF
    else if (width == 352 && height == 288)
        return 1;
    // ERROR
    else
        return -1;
}

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);

    /* Update the pointer to last GOB */
    s->ptr_lastgob = put_bits_ptr(&s->pb);

    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
    put_sbits(&s->pb, 5, temp_ref); /* TemporalReference */

    put_bits(&s->pb, 1, 0); /* split screen off */
    put_bits(&s->pb, 1, 0); /* camera  off */
    put_bits(&s->pb, 1, 0); /* freeze picture release off */

    format = ff_h261_get_picture_format(s->width, s->height);

    put_bits(&s->pb, 1, format); /* 0 == QCIF, 1 == CIF */

    put_bits(&s->pb, 1, 0); /* still image mode */
    put_bits(&s->pb, 1, 0); /* reserved */

    put_bits(&s->pb, 1, 0); /* no PEI */
    if(format == 0)
        h->gob_number = -1;
    else
        h->gob_number = 0;
    h->current_mba = 0;
}

/**
 * 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
    }
    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;
    h->previous_mba = 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;

    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;

        ff_init_block_index(s);
        ff_update_block_index(s);
    }
}

static void h261_encode_motion(H261Context * h, int val){
    MpegEncContext * const s = &h->s;
    int sign, code;
    if(val==0){
        code = 0;
        put_bits(&s->pb,h261_mv_tab[code][1],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,h261_mv_tab[code][1],h261_mv_tab[code][0]);
        put_bits(&s->pb,1,sign);
    }
}

static inline int get_cbp(MpegEncContext * s,
                      int16_t block[6][64])
{
    int i, cbp;
    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)
{
    H261Context * h = (H261Context *)s;
    int mvd, mv_diff_x, mv_diff_y, i, cbp;
    cbp = 63; // avoid warning
    mvd = 0;

    h->current_mba++;
    h->mtype = 0;

    if (!s->mb_intra){
        /* compute cbp */
        cbp= get_cbp(s, block);

        /* mvd indicates if this block is motion compensated */
        mvd = motion_x | motion_y;

        if((cbp | mvd | s->dquant ) == 0) {
            /* skip macroblock */
            s->skip_count++;
            h->current_mv_x=0;
            h->current_mv_y=0;
            return;
        }
    }

    /* 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]);

    /* calculate MTYPE */
    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)
            h->mtype++;
        assert(h->mtype > 1);
    }

    if(s->dquant)
        h->mtype++;

    put_bits(&s->pb, h261_mtype_bits[h->mtype], h261_mtype_code[h->mtype]);

    h->mtype = h261_mtype_map[h->mtype];

    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;
        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);
    }

    h->previous_mba = h->current_mba;

    if(HAS_CBP(h->mtype)){
        assert(cbp>0);
        put_bits(&s->pb,h261_cbp_tab[cbp-1][1],h261_cbp_tab[cbp-1][0]);
    }
    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;
    }
}

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);
    }

    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;
    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]);// END OF BLOCK
    }
}

FF_MPV_GENERIC_CLASS(h261)

AVCodec ff_h261_encoder = {
    .name           = "h261",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_H261,
    .priv_data_size = sizeof(H261Context),
    .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 },
    .long_name      = NULL_IF_CONFIG_SMALL("H.261"),
    .priv_class     = &h261_class,
};
Commit	Line	Data
d632239c PI	1	/*
	2	* H261 encoder
	3	* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
	4	* Copyright (c) 2004 Maarten Daniels
	5	*
2912e87a	6	* This file is part of Libav.
d632239c	7	*
2912e87a	8	* Libav is free software; you can redistribute it and/or
d632239c PI	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; either
	11	* version 2.1 of the License, or (at your option) any later version.
	12	*
2912e87a	13	* Libav is distributed in the hope that it will be useful,
d632239c PI	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
2912e87a	19	* License along with Libav; if not, write to the Free Software
d632239c PI	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	/**
ba87f080	24	* @file
d632239c PI	25	* H.261 encoder.
	26	*/
	27
d632239c PI	28	#include "avcodec.h"
d632239c PI	29	#include "mpegvideo.h"
06e03fa0	30	#include "h263.h"
d632239c	31	#include "h261.h"
b3e83c96	32	#include "h261data.h"
d632239c	33
88bd7fdc	34	static void h261_encode_block(H261Context * h, int16_t * block,
d632239c PI	35	int n);
	36
	37	int ff_h261_get_picture_format(int width, int height){
	38	// QCIF
	39	if (width == 176 && height == 144)
	40	return 0;
	41	// CIF
	42	else if (width == 352 && height == 288)
	43	return 1;
	44	// ERROR
	45	else
	46	return -1;
	47	}
	48
	49	void ff_h261_encode_picture_header(MpegEncContext * s, int picture_number){
	50	H261Context * h = (H261Context *) s;
	51	int format, temp_ref;
	52
9f51c682	53	avpriv_align_put_bits(&s->pb);
d632239c PI	54
d632239c PI	55	/* Update the pointer to last GOB */
fb53b4a0	56	s->ptr_lastgob = put_bits_ptr(&s->pb);
d632239c PI	57
	58	put_bits(&s->pb, 20, 0x10); /* PSC */
	59
	60	temp_ref= s->picture_number * (int64_t)30000 * s->avctx->time_base.num /
	61	(1001 * (int64_t)s->avctx->time_base.den); //FIXME maybe this should use a timestamp
6647ab80	62	put_sbits(&s->pb, 5, temp_ref); /* TemporalReference */
d632239c PI	63
	64	put_bits(&s->pb, 1, 0); /* split screen off */
	65	put_bits(&s->pb, 1, 0); /* camera off */
	66	put_bits(&s->pb, 1, 0); /* freeze picture release off */
	67
	68	format = ff_h261_get_picture_format(s->width, s->height);
	69
	70	put_bits(&s->pb, 1, format); /* 0 == QCIF, 1 == CIF */
	71
	72	put_bits(&s->pb, 1, 0); /* still image mode */
	73	put_bits(&s->pb, 1, 0); /* reserved */
	74
	75	put_bits(&s->pb, 1, 0); /* no PEI */
	76	if(format == 0)
	77	h->gob_number = -1;
	78	else
	79	h->gob_number = 0;
	80	h->current_mba = 0;
	81	}
	82
	83	/**
49bd8e4b	84	* Encode a group of blocks header.
d632239c PI	85	*/
	86	static void h261_encode_gob_header(MpegEncContext * s, int mb_line){
	87	H261Context * h = (H261Context *)s;
	88	if(ff_h261_get_picture_format(s->width, s->height) == 0){
	89	h->gob_number+=2; // QCIF
	90	}
	91	else{
	92	h->gob_number++; // CIF
	93	}
	94	put_bits(&s->pb, 16, 1); /* GBSC */
	95	put_bits(&s->pb, 4, h->gob_number); /* GN */
	96	put_bits(&s->pb, 5, s->qscale); /* GQUANT */
	97	put_bits(&s->pb, 1, 0); /* no GEI */
	98	h->current_mba = 0;
	99	h->previous_mba = 0;
	100	h->current_mv_x=0;
	101	h->current_mv_y=0;
	102	}
	103
	104	void ff_h261_reorder_mb_index(MpegEncContext* s){
	105	int index= s->mb_x + s->mb_y*s->mb_width;
	106
	107	if(index % 33 == 0)
	108	h261_encode_gob_header(s,0);
	109
	110	/* for CIF the GOB's are fragmented in the middle of a scanline
	111	that's why we need to adjust the x and y index of the macroblocks */
	112	if(ff_h261_get_picture_format(s->width,s->height) == 1){ // CIF
	113	s->mb_x = index % 11 ; index /= 11;
	114	s->mb_y = index % 3 ; index /= 3;
	115	s->mb_x+= 11*(index % 2); index /= 2;
	116	s->mb_y+= 3*index;
	117
	118	ff_init_block_index(s);
	119	ff_update_block_index(s);
	120	}
	121	}
	122
	123	static void h261_encode_motion(H261Context * h, int val){
	124	MpegEncContext * const s = &h->s;
	125	int sign, code;
	126	if(val==0){
	127	code = 0;
	128	put_bits(&s->pb,h261_mv_tab[code][1],h261_mv_tab[code][0]);
	129	}
	130	else{
	131	if(val > 15)
	132	val -=32;
	133	if(val < -16)
	134	val+=32;
	135	sign = val < 0;
	136	code = sign ? -val : val;
	137	put_bits(&s->pb,h261_mv_tab[code][1],h261_mv_tab[code][0]);
	138	put_bits(&s->pb,1,sign);
	139	}
	140	}
	141
	142	static inline int get_cbp(MpegEncContext * s,
88bd7fdc	143	int16_t block[6][64])
d632239c PI	144	{
	145	int i, cbp;
	146	cbp= 0;
	147	for (i = 0; i < 6; i++) {
	148	if (s->block_last_index[i] >= 0)
	149	cbp \|= 1 << (5 - i);
	150	}
	151	return cbp;
	152	}
	153	void ff_h261_encode_mb(MpegEncContext * s,
88bd7fdc	154	int16_t block[6][64],
d632239c PI	155	int motion_x, int motion_y)
	156	{
	157	H261Context * h = (H261Context *)s;
	158	int mvd, mv_diff_x, mv_diff_y, i, cbp;
	159	cbp = 63; // avoid warning
	160	mvd = 0;
	161
	162	h->current_mba++;
	163	h->mtype = 0;
	164
	165	if (!s->mb_intra){
	166	/* compute cbp */
	167	cbp= get_cbp(s, block);
	168
	169	/* mvd indicates if this block is motion compensated */
	170	mvd = motion_x \| motion_y;
	171
	172	if((cbp \| mvd \| s->dquant ) == 0) {
	173	/* skip macroblock */
	174	s->skip_count++;
	175	h->current_mv_x=0;
	176	h->current_mv_y=0;
	177	return;
	178	}
	179	}
	180
	181	/* MB is not skipped, encode MBA */
	182	put_bits(&s->pb, h261_mba_bits[(h->current_mba-h->previous_mba)-1], h261_mba_code[(h->current_mba-h->previous_mba)-1]);
	183
	184	/* calculate MTYPE */
	185	if(!s->mb_intra){
	186	h->mtype++;
	187
	188	if(mvd \|\| s->loop_filter)
	189	h->mtype+=3;
	190	if(s->loop_filter)
	191	h->mtype+=3;
	192	if(cbp \|\| s->dquant)
	193	h->mtype++;
	194	assert(h->mtype > 1);
	195	}
	196
	197	if(s->dquant)
	198	h->mtype++;
	199
	200	put_bits(&s->pb, h261_mtype_bits[h->mtype], h261_mtype_code[h->mtype]);
	201
	202	h->mtype = h261_mtype_map[h->mtype];
	203
	204	if(IS_QUANT(h->mtype)){
	205	ff_set_qscale(s,s->qscale+s->dquant);
	206	put_bits(&s->pb, 5, s->qscale);
	207	}
	208
	209	if(IS_16X16(h->mtype)){
	210	mv_diff_x = (motion_x >> 1) - h->current_mv_x;
	211	mv_diff_y = (motion_y >> 1) - h->current_mv_y;
	212	h->current_mv_x = (motion_x >> 1);
	213	h->current_mv_y = (motion_y >> 1);
	214	h261_encode_motion(h,mv_diff_x);
	215	h261_encode_motion(h,mv_diff_y);
	216	}
	217
	218	h->previous_mba = h->current_mba;
219
220	if(HAS_CBP(h->mtype)){
221	assert(cbp>0);
222	put_bits(&s->pb,h261_cbp_tab[cbp-1][1],h261_cbp_tab[cbp-1][0]);
223	}
224	for(i=0; i<6; i++) {
225	/* encode each block */
226	h261_encode_block(h, block[i], i);
227	}
228
229	if ( ( h->current_mba == 11 ) \|\| ( h->current_mba == 22 ) \|\| ( h->current_mba == 33 ) \|\| ( !IS_16X16 ( h->mtype ) )){
230	h->current_mv_x=0;
231	h->current_mv_y=0;
232	}
233	}
234
235	void ff_h261_encode_init(MpegEncContext *s){
236	static int done = 0;
237
238	if (!done) {
239	done = 1;
e96b4a53	240	ff_init_rl(&h261_rl_tcoeff, ff_h261_rl_table_store);
d632239c PI	241	}
	242
	243	s->min_qcoeff= -127;
	244	s->max_qcoeff= 127;
	245	s->y_dc_scale_table=
	246	s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
	247	}
	248
	249
	250	/**
58c42af7	251	* Encode an 8x8 block.
d632239c PI	252	* @param block the 8x8 block
	253	* @param n block index (0-3 are luma, 4-5 are chroma)
	254	*/
88bd7fdc	255	static void h261_encode_block(H261Context * h, int16_t * block, int n){
d632239c	256	MpegEncContext * const s = &h->s;
38a7695f	257	int level, run, i, j, last_index, last_non_zero, sign, slevel, code;
d632239c PI	258	RLTable *rl;
	259
	260	rl = &h261_rl_tcoeff;
	261	if (s->mb_intra) {
	262	/* DC coef */
	263	level = block[0];
	264	/* 255 cannot be represented, so we clamp */
	265	if (level > 254) {
	266	level = 254;
	267	block[0] = 254;
	268	}
	269	/* 0 cannot be represented also */
	270	else if (level < 1) {
	271	level = 1;
	272	block[0] = 1;
	273	}
	274	if (level == 128)
	275	put_bits(&s->pb, 8, 0xff);
	276	else
	277	put_bits(&s->pb, 8, level);
	278	i = 1;
	279	} else if((block[0]==1 \|\| block[0] == -1) && (s->block_last_index[n] > -1)){
	280	//special case
	281	put_bits(&s->pb,2,block[0]>0 ? 2 : 3 );
	282	i = 1;
	283	} else {
	284	i = 0;
	285	}
	286
	287	/* AC coefs */
	288	last_index = s->block_last_index[n];
	289	last_non_zero = i - 1;
	290	for (; i <= last_index; i++) {
	291	j = s->intra_scantable.permutated[i];
	292	level = block[j];
	293	if (level) {
	294	run = i - last_non_zero - 1;
d632239c PI	295	sign = 0;
	296	slevel = level;
	297	if (level < 0) {
	298	sign = 1;
	299	level = -level;
	300	}
	301	code = get_rl_index(rl, 0 /no last in H.261, EOB is used/, run, level);
	302	if(run==0 && level < 16)
	303	code+=1;
	304	put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
	305	if (code == rl->n) {
	306	put_bits(&s->pb, 6, run);
	307	assert(slevel != 0);
	308	assert(level <= 127);
6647ab80	309	put_sbits(&s->pb, 8, slevel);
d632239c PI	310	} else {
	311	put_bits(&s->pb, 1, sign);
	312	}
	313	last_non_zero = i;
	314	}
	315	}
	316	if(last_index > -1){
	317	put_bits(&s->pb, rl->table_vlc[0][1], rl->table_vlc[0][0]);// END OF BLOCK
	318	}
	319	}
	320
ed019b8e AK	321	FF_MPV_GENERIC_CLASS(h261)
ed019b8e AK	322
d36beb3f	323	AVCodec ff_h261_encoder = {
ec6402b7 AK	324	.name = "h261",
ec6402b7 AK	325	.type = AVMEDIA_TYPE_VIDEO,
36ef5369	326	.id = AV_CODEC_ID_H261,
ec6402b7	327	.priv_data_size = sizeof(H261Context),
efd29844	328	.init = ff_MPV_encode_init,
445a7d48	329	.encode2 = ff_MPV_encode_picture,
efd29844	330	.close = ff_MPV_encode_end,
716d413c	331	.pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
00c3b67b	332	.long_name = NULL_IF_CONFIG_SMALL("H.261"),
ed019b8e	333	.priv_class = &h261_class,
d632239c	334	};