void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number) { mpeg1_encode_sequence_header(s); /* mpeg1 picture header */ put_header(s, PICTURE_START_CODE); /* temporal reference */ // RAL: s->picture_number instead of s->fake_picture_number put_bits(&s->pb, 10, (s->picture_number - s->gop_picture_number) & 0x3ff); s->fake_picture_number++; put_bits(&s->pb, 3, s->pict_type); s->vbv_delay_ptr= s->pb.buf + get_bit_count(&s->pb)/8; put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */ // RAL: Forward f_code also needed for B frames if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) { put_bits(&s->pb, 1, 0); /* half pel coordinates */ if(s->codec_id == CODEC_ID_MPEG1VIDEO) put_bits(&s->pb, 3, s->f_code); /* forward_f_code */ else put_bits(&s->pb, 3, 7); /* forward_f_code */ } // RAL: Backward f_code necessary for B frames if (s->pict_type == B_TYPE) { put_bits(&s->pb, 1, 0); /* half pel coordinates */ if(s->codec_id == CODEC_ID_MPEG1VIDEO) put_bits(&s->pb, 3, s->b_code); /* backward_f_code */ else put_bits(&s->pb, 3, 7); /* backward_f_code */ } put_bits(&s->pb, 1, 0); /* extra bit picture */ s->frame_pred_frame_dct = 1; if(s->codec_id == CODEC_ID_MPEG2VIDEO){ put_header(s, EXT_START_CODE); put_bits(&s->pb, 4, 8); //pic ext if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) { put_bits(&s->pb, 4, s->f_code); put_bits(&s->pb, 4, s->f_code); }else{ put_bits(&s->pb, 8, 255); } if (s->pict_type == B_TYPE) { put_bits(&s->pb, 4, s->b_code); put_bits(&s->pb, 4, s->b_code); }else{ put_bits(&s->pb, 8, 255); } put_bits(&s->pb, 2, s->intra_dc_precision); put_bits(&s->pb, 2, s->picture_structure= PICT_FRAME); if (s->progressive_sequence) { put_bits(&s->pb, 1, 0); /* no repeat */ } else { put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first); } /* XXX: optimize the generation of this flag with entropy measures */ s->frame_pred_frame_dct = s->progressive_sequence; put_bits(&s->pb, 1, s->frame_pred_frame_dct); put_bits(&s->pb, 1, s->concealment_motion_vectors); put_bits(&s->pb, 1, s->q_scale_type); put_bits(&s->pb, 1, s->intra_vlc_format); put_bits(&s->pb, 1, s->alternate_scan); put_bits(&s->pb, 1, s->repeat_first_field); put_bits(&s->pb, 1, s->chroma_420_type=1); s->progressive_frame = s->progressive_sequence; put_bits(&s->pb, 1, s->progressive_frame); put_bits(&s->pb, 1, 0); //composite_display_flag } if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){ int i; put_header(s, USER_START_CODE); for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){ put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]); } } s->mb_y=0; ff_mpeg1_encode_slice_header(s); }