MpegEncContext s;
int current_mba;
+ int previous_mba;
int mba_diff;
int mtype;
int current_mv_x;
s->dsp.h261_loop_filter(dest_cr, uvlinesize);
}
+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;
+}
+
+static void h261_encode_block(H261Context * h, DCTELEM * block,
+ int n);
static int h261_decode_block(H261Context *h, DCTELEM *block,
int n, int coded);
static int h261_decode_mb(H261Context *h);
void ff_set_qscale(MpegEncContext * s, int qscale);
+void ff_h261_encode_picture_header(MpegEncContext * s, int picture_number){
+ H261Context * h = (H261Context *) s;
+ int format, coded_frame_rate, coded_frame_rate_base, temp_ref;
+ int best_clock_code=1;
+ int best_divisor=60;
+ coded_frame_rate= 1800000;
+ coded_frame_rate_base= (1000+best_clock_code)*best_divisor;
+
+ align_put_bits(&s->pb);
+
+ /* Update the pointer to last GOB */
+ s->ptr_lastgob = pbBufPtr(&s->pb);
+
+ put_bits(&s->pb, 20, 0x10); /* PSC */
+
+ temp_ref= s->picture_number * (int64_t)coded_frame_rate * s->avctx->frame_rate_base /
+ (coded_frame_rate_base * (int64_t)s->avctx->frame_rate);
+ put_bits(&s->pb, 5, temp_ref & 0x1f); /* 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;
+}
+
+/**
+ * Encodes 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){
+ /* 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
+ if((s->mb_x == 0 && (s->mb_y % 3 == 0) ) || (s->mb_x == 11 && ((s->mb_y -1 )% 3 == 0) ))
+ h261_encode_gob_header(s,0);
+ if(s->mb_x < 11 ){
+ if((s->mb_y % 3) == 1 ){
+ s->mb_x += 0;
+ s->mb_y += 1;
+ }
+ else if( (s->mb_y % 3) == 2 ){
+ s->mb_x += 11;
+ s->mb_y -= 1;
+ }
+ }
+ else{
+ if((s->mb_y % 3) == 1 ){
+ s->mb_x += 0;
+ s->mb_y -= 1;
+ }
+ else if( (s->mb_y % 3) == 0 ){
+ s->mb_x -= 11;
+ s->mb_y += 1;
+ }
+ }
+ ff_init_block_index(s);
+ ff_update_block_index(s);
+ /* for QCIF we don't need to reorder MB's
+ there the GOB's aren't fragmented in the middle of a scanline */
+ }else if(ff_h261_get_picture_format(s->width,s->height) == 0){ // QCIF
+ if(s->mb_y % 3 == 0 && s->mb_x == 0)
+ h261_encode_gob_header(s,0);
+ }
+}
+
+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 > 16)
+ 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,
+ DCTELEM 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,
+ DCTELEM block[6][64],
+ int motion_x, int motion_y)
+{
+ H261Context * h = (H261Context *)s;
+ int old_mtype, mvd, mv_diff_x, mv_diff_y, i, cbp;
+ cbp = 63; // avoid warning
+ mvd = 0;
+
+ h->current_mba++;
+ old_mtype = h->mtype;
+ h->mtype = 0;
+
+ if (!s->mb_intra){
+ /* compute cbp */
+ cbp= get_cbp(s, block);
+
+ /* mvd indicates if this block is motion compensated */
+ if(((motion_x >> 1) - h->current_mv_x != 0) || ((motion_y >> 1 ) - h->current_mv_y) != 0){
+ mvd = 1;
+ }
+ else if((motion_x >> 1 == 0) && (motion_y >> 1 == 0)){
+ mvd = 0;
+ }
+ else
+ mvd = 1;
+ 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+=2;
+ if(mvd == 1){
+ h->mtype+=2;
+ if(cbp!=0)
+ h->mtype+=1;
+ if(s->loop_filter)
+ h->mtype+=3;
+ }
+ }
+
+ 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)){
+ 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;
+ init_rl(&h261_rl_tcoeff);
+ }
+
+ s->min_qcoeff= -127;
+ s->max_qcoeff= 127;
+ s->y_dc_scale_table=
+ s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
+}
+
+
+/**
+ * encodes a 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, DCTELEM * block, int n){
+ MpegEncContext * const s = &h->s;
+ int level, run, last, 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,1,1);
+ put_bits(&s->pb,1,block[0]>0 ? 0 : 1 );
+ 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;
+ last = (i == last_index);
+ 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);
+ if(slevel < -127){
+ slevel = -127;
+ }
+ else if(slevel > 127){
+ slevel = 127;
+ }
+ put_bits(&s->pb, 8, slevel & 0xff);
+ } 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
+ }
+}
+
/***********************************************/
/* decoding */
return 0;
}
+AVCodec h261_encoder = {
+ "h261",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_H261,
+ sizeof(H261Context),
+ MPV_encode_init,
+ MPV_encode_picture,
+ MPV_encode_end,
+};
+
AVCodec h261_decoder = {
"h261",
CODEC_TYPE_VIDEO,
s->low_delay=1;
break;
#ifdef CONFIG_RISKY
+ case CODEC_ID_H261:
+ s->out_format = FMT_H261;
+ avctx->delay=0;
+ s->low_delay=1;
+ break;
case CODEC_ID_H263:
if (h263_get_picture_format(s->width, s->height) == 7) {
av_log(avctx, AV_LOG_INFO, "Input picture size isn't suitable for h263 codec! try h263+\n");
#ifdef CONFIG_ENCODERS
#ifdef CONFIG_RISKY
+ if (s->out_format == FMT_H261)
+ ff_h261_encode_init(s);
if (s->out_format == FMT_H263)
h263_encode_init(s);
if(s->msmpeg4_version)
if(s->codec_id==CODEC_ID_MPEG4 && s->mpeg_quant){
s->intra_matrix[j] = ff_mpeg4_default_intra_matrix[i];
s->inter_matrix[j] = ff_mpeg4_default_non_intra_matrix[i];
- }else if(s->out_format == FMT_H263){
+ }else if(s->out_format == FMT_H263 || s->out_format == FMT_H261){
s->intra_matrix[j] =
s->inter_matrix[j] = ff_mpeg1_default_non_intra_matrix[i];
}else
msmpeg4_encode_mb(s, s->block, motion_x, motion_y); break;
case CODEC_ID_WMV2:
ff_wmv2_encode_mb(s, s->block, motion_x, motion_y); break;
+ case CODEC_ID_H261:
+ ff_h261_encode_mb(s, s->block, motion_x, motion_y); break;
case CODEC_ID_H263:
case CODEC_ID_H263P:
case CODEC_ID_FLV1:
ff_init_block_index(s);
for(mb_x=0; mb_x < s->mb_width; mb_x++) {
- const int xy= mb_y*s->mb_stride + mb_x;
+ int xy= mb_y*s->mb_stride + mb_x; // removed const, H261 needs to adjust this
int mb_type= s->mb_type[xy];
// int d;
int dmin= INT_MAX;
int dir;
s->mb_x = mb_x;
+ s->mb_y = mb_y; // moved into loop, can get changed by H.261
ff_update_block_index(s);
+ if(s->codec_id == CODEC_ID_H261){
+ ff_h261_reorder_mb_index(s);
+ xy= s->mb_y*s->mb_stride + s->mb_x;
+ }
+
/* write gob / video packet header */
#ifdef CONFIG_RISKY
if(s->rtp_mode){
mjpeg_picture_header(s);
break;
#ifdef CONFIG_RISKY
+ case FMT_H261:
+ ff_h261_encode_picture_header(s, picture_number);
+ break;
case FMT_H263:
if (s->codec_id == CODEC_ID_WMV2)
ff_wmv2_encode_picture_header(s, picture_number);